37110553 LG 40 to 60 Inch Repair Guide Presentation

June 9, 2018 | Author: esausman | Category: Electrical Connector, Printed Circuit Board, Power Supply, Electronic Circuits, Electrical Engineering
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PDP One Point Repair Guide1. General 2. 40 ~ 50 Inch Practice 3. 60 Inch Practice Symptom Cause (Bad X-Board PCB) Countermeasure Change X board Red Bar at left lower PCB Pattern Short CHECK Point 1. Check after X-Board change 2. Do shortage check neighboring pins of FPC* connector 3. Check soldering condition of defect pin 4. Scan the pattern connected to defect pin with Microscpoe *FPC : Flat Pin Connector 2/88 LG Electronics / DND / QA Gr. Symptom Cause Countermeasure PCB G R Red & Green pin of left lower 4th FPC short Change X-Board Defect Point : Short on the PCB just above connector 1. Cause : Short by solder bridge - Can not observe with naked eye - When connector open, pattern is OK Check Point 1. Check the contact status with connector(foreign material, soldering condition) 2. Replace X Board and check again.(If OK, X-Board is defected) 3. By tracing defected line, check the contact condition of FPC and other connectors, IC output stage and PCB pattern. 4. If no problem, check the connector lead board. 3/88 LG Electronics / DND / QA Gr. Symptom Cause Countermeasure Pattern Short by connector miss insert Re-insert the Connector Bottom Right 6th FPC R/B Short Check Point 1. Check the contact status with connector(foreign material, soldering condition) 2. Replace X Board and check again.(If OK, X-Board is defected) 3. By tracing defected line, check the contact condition of FPC and other connectors, IC output stage and PCB pattern. 4. If no problem, check the connector lead board. 4/88 LG Electronics / DND / QA Gr. Trace defected line 2.B Raster or White Screen(Different color display) Apply silicon on the Connector lead Pay attention to a capillary symptom Check Point 1. IC Output stage and Electrode line.G. . Check the condition of FPC and connector on the X-Board. 5/88 LG Electronics / DND / QA Gr.Symptom Cause Countermeasure SHORT Foreign Material(Iron powder) in the Connector Gap X-Board Tape Rework Insulation tape ADD Electrode short at R. Symptom Cause Keep horizontal. IC Output stage and Electrode line. . or can be defected Countermeasure OPEN Interfere with mechanical structure when Module assembling Cold soldering at Connector 1. Outbreak during heat run 2. ADD Electrode open at one color Raster or White screen(No discharge) FPC connector Rework Use Connector fixing iron plate Keep the contact point horizontal when interfere with mechanical parts Check Point 1. Trace defected line and check the condition of FPC and connector on X-Board. 6/88 LG Electronics / DND / QA Gr. Check the connection condition of connector of Panel side and the FPC at upper ACF. Check the connection status of Panel side. If it is OK. 3. change the Panel) 2. check Panel pad 7/88 LG Electronics / DND / QA Gr. .Symptom Cause Countermeasure ADD Pattern Replace the Panel Connected minutely and open slowly as time passes ADD open Check Point 1. Replace X Board and check again(Still problem. .0 2. check the output stage of Drive IC(Cold soldering/Pattern) If problems in input stage.Press the connector and reconnect 2.2 Resistance B 6.17. several lines display * The difference of ADD open and Short ? ADD open : Black vertical bar at Raster ADD short : Different color vertical bar at Raster 8/88 LG Electronics / DND / QA Gr.Symptom & Cause Countermeasure ~ ADD Electrode open at Green Raster Panel Electrode Open Electrode(16) 1.4 Resistance B FPC Electrode Resistance A Check Point 1.2 1. ADD pattern of PAD siden open 2.15.0 ~1. Check the soldering condition of Connector lead 3.2~2.19pin 1.3. in case of one line. Check the connection condition . Replace X Board and check again. Width : 10 um Replace the Panel ~ ACF Resistance A 16pin 1. Panel connector side or Circuit connector side Board defect. etc) 4. foreign material at connector. it makes similar problem 2. . Check Point 1. Check the 5V(Logic voltage) input to DC-DC If it is lower than 5V. change the Board) 5. Confirm the connection of the connector 9/88 LG Electronics / DND / QA Gr.Symptom Cause Control board Countermeasure Con 1 Con 2 X-board Change Control Board < Raster > < White > Solder bridge ADD short at raster screen and ADD open at white screen appear at some area after 20 minute HeatRun. Check X Board(Open or Short circuit) 3. Check the drive IC at X Board(If defected. Check the connection condition(conncetion status. several lines are defected at one point Replace the X Board of defected point 10/88 LG Electronics / DND / QA Gr.Symptom Cause Countermeasure Change X-BOARD X-DRV IC CLK LE PCB pattern short R264 R258 U1 SN74ACT541 Short Check Point Driver clock line at X Driver Board is designed to operate in A and B group Short circuit at clock line of Drive IC If problem at input stage. . 11/88 LG Electronics / DND / QA Gr. Check the connection condition of the Connector. Check the cold soldering. 2. .Symptom Cause Countermeasure <X-board> connector Chip Resistors 1 X driver chip (SN755851PJ) 4X16 = 64 data M o d u l e Change X Board Electrode Pattern 64 16 clock line1 line2 line3 line4 PCB pattern is connected minutely Foreign material when photo resisting Check Point 1. . Measure the resistance of Via holes between U3 and U300 at Control Board and compare with that of normal. Resistance increases as temperature rises.(Normal : 2~3 Ÿ) 2.Symptom Cause Countermeasure Resistance between 186 pin of U3 and 7 pin of U300 is 62 Normal condition : 2Ÿ Because of foreign material in Via hole at U300 side Via hole U3 ALTERA Chip Change Control Board U300 DRAM 7pin PIN Vertical bar in every 20mm 186pin PIN Control board Check Point 1. 12/88 LG Electronics / DND / QA Gr. Resistance between two pins varies from 19 ohm ~ 45Kohm Check Point 1. . Observe the symptom during Heat-Run at 45 degree.Symptom Cause Countermeasure .Open circuit between pin 7 of U200 and pin 7 of U7 Replace Control Board . 2. Check the resistance of VIA holes of suspect ICs 13/88 LG Electronics / DND / QA Gr. Symptom .Y and Z Board. Because Control data on PROM(U40) doesn¶t download to FPGA. 2. Defected ALTERA.D1 : ON with 5V . and each PROM has correspondent FPGA. CONTROL BOARD Check Point 1.When Power On. See left picture.LED(D3) of Control Board doesn¶t operate D1 D3 PROM(U40) Cause Countermeasure D4 1. ‡Replace Control Board ‡Replace PROM FPGA * For normal operation. it can¶t generate control signal to X. Check D1. .D3 : ON when PROM finishes program download from ALTERA chip .D4 : ON when signal is applied 14/88 LG Electronics / DND / QA Gr. D3 & D4 on Control Board . PROM program should be downloaded to FPGA. Fan operates but No OSD displays . .Symptom Cause Control Board Countermeasure Replace Controller board Touch point(Marked) No signal or at PC mode. This is darker than normal Red signal.Control board of Module 15/88 LG Electronics / DND / QA Gr. dark red raster displays.TV VSC board .Board connector(50 pin) contact point . Neighboring Pins of U1(FPGA) touch Check Point . Diode and Resistor(especially Cement Resistor) 4. Separate SMPS Board and VSC Board and check all voltage output stage 3. . Observe PCB Pattern and soldering condition with naked eyes 16/88 LG Electronics / DND / QA Gr. Check FET.Symptoms Cause 1. Check Vs. Spark noise(Tik-Tik) 3. Vsetup & Vsc Solder land Solder Soldering Direction Check Point 1. Va with multimeter(No Vs output) 2. CN1 on Vs Board cold soldering 2. TR. Spark marks between CN1 and Vs Board -> It makes them open Countermeasure Replace DC-DC 2 board Soldering Direction CN1 Vs board Soldering point 1. No Vs. No Raster(ST-BY LED On) 2. .40 ~ 42 Inch 42´ PDP Flicker and No Raster Troubleshooting Guide 42 Inch cause : bad connection between Y-Board # 1. 2 drive board Connector pin P6 Rework should be done P4 Y-Driver Board Y-Board 17/88 LG Electronics / DND / QA Gr. 2001. when wiring. amplified 18/88 LG Electronics / DND / QA Gr. it should be done as picture shown. If not there can be noise) ‡Don¶t be confused with Pin number ‡Improved since Dec. P 4 both are the first pin.P4 P6 amplified : outside Leg : inside Leg ‡P 6. (bend the wire to Y-Driver B/D not to Y-B/D . . Be sure not to misconnect the line. . See the picture precisely and then connect jump wire at the exact point 19/88 LG Electronics / DND / QA Gr. 1) normal 20/88 LG Electronics / DND / QA Gr. LED is green screen is distorted weiderly (happened 2 a day) X CANVAS cause : bad connection between Y-Board and #1. 2 pin of Y-Drive Board Connector troubleshooting : connect bad linking between Y-Board & Y-Drive with jump wire (all 4 parts) see working instruction(revised since Dec. .Intermittent no-image/image error while watching X CANVAS X CANVAS The screen is intermittently disappeared .2001. No Power X CANVAS X CANVAS No Power ( in ST-BY mode. but no LED) normal Check the power supply & main power S/W on Check EMI board fuse (check the rated capacity ) Be sure to use rated fuse. . Fuse 15 A 21/88 LG Electronics / DND / QA Gr. (check STB defect or Monitor defect ) When using ANALOG STB. When the power is not off. check STB only MN-42PZ10 only STB : RN-BA11 Remove each Board¶s power supply connector and check the power is off. it¶s off ( LED changing green into red ) normal CHECK : remove STB and operate monitor individually.No Raster X CANVAS X CANVAS when Power¶s on. 22/88 LG Electronics / DND / QA Gr.replace the related board. . after 2 ~ 3 sec. . Troubleshooting : replace VSC Board 23/88 LG Electronics / DND / QA Gr. check VSC and then Controller Board.No Picture X CANVAS X CANVAS no picture (LED¶s green) normal Core checkpoint : remove STB and operate monitor individually. (check whether STB¶s a defect or monitor¶s one) With monitor defect. .Address Bar ( Horizontal Bar ) X CANVAS X CANVAS no image (LED¶s green) normal Cause : Y-Drive ( Bottom ) defect Troubleshooting : Y-Drive (lower part) replacement This problem is shown in the bottom of screen. So it is caused by Y-Drive Y-Drive Board ( Bottom ) 24/88 LG Electronics / DND / QA Gr. .Address Bar ( Horizontal Bar ) X CANVAS X CANVAS no image (LED¶s green) normal Y-Drive Board ( Top ) Cause : Y-Drive Board (upper part) defect Troubleshooting : Y-Drive Board replacement 25/88 LG Electronics / DND / QA Gr. . Various defect symptoms can be seen) 26/88 LG Electronics / DND / QA Gr.No Picture X CANVAS X CANVAS no image (LED¶s green) normal PD501 Connector cause : PD-501 Connector contact point defect troubleshooting : PD-501 Connector replacement (with PD-501 Connector contact point defect. High frequency noise (³Bee´ sound) X CANVAS X CANVAS normal picture with high frequency noise (³bee´) SMPS is supposed to operate with high frequency so small noise is not considered as a defect. and then connect it to R8164 right lead. C8178 0. Open C8139 right lead.22uF electrolytic capacitor insertion Open C8139 right lead and then wire R8164 right lead #. Slight noise is not a defect and write down explanation 27/88 LG Electronics / DND / QA Gr.22 /50V add 2. Power (SMPS) Board 1. Improved since Nov. .2001 normal C8178 0. 2/5 area normal X-Board ( Left ) power supply check X-Board ( Left )Connector check X-Board ( Left ) replacement 28/88 LG Electronics / DND / QA Gr.2/5 area X CANVAS X CANVAS No picture in the right. .No picture in right. .Address Bar (Vertical ) X CANVAS X CANVAS stripe in right-2/5 area X-Board ( Left ) power supply check X-Board ( Left ) Connector check X-Board ( Left ) replacement normal 29/88 LG Electronics / DND / QA Gr. .No picture in left 3/5 of the screen X CANVAS X CANVAS left 3/5 of screen with vertical stripes normal X-Board ( Right ) power supply check X-Board ( Right )Connector check X-Board ( Right ) replacement 30/88 LG Electronics / DND / QA Gr. normal X-Board ( Right ) power supply check X-Board ( Right )Connector check X-Board ( Right ) replacement 31/88 LG Electronics / DND / QA Gr. .Address Bar (Vertical ) X CANVAS X CANVAS left 3/5 of screen with vertical stripes. focus on 25 Pin.No Red X CANVAS X CANVAS no Red ( B or G ) normal Test Monitor individually. . If detect a problem with monitor. check VSC Board. 32/88 LG Electronics / DND / QA Gr. If it has a problem with STB connecting. Be sure not to connect 5 Pin (AP-EA10) by force 25 Pin Cable P/No : GVZ AP-EA10 Be sure not to bend it by force or internal Insulated conductor can be down. first you should separate COF Connector. 42 Inch When you handle COF CONNECTOR.Board COF Connector separation Lift up the right and left of X-BOARD CONNECTOR. Be careful to handle it. First release LOCK and separate.1) X . be aware of this!! COF Connector Warning When you exchange X-Board. you should replace MODULE ASS¶Y. If COF CONNECTOR is damaged. don¶t pressure. Lift up X-BOARD CONNECTOR and separate COP CONNECTOR by pulling up. Module ASS¶Y must be replaced a new one. COF Connector is attached to Module. When COF Connector is broken. So. . 33/88 LG Electronics / DND / QA Gr. replace a new X-BOARD 34/88 LG Electronics / DND / QA Gr. Warning It¶s easy to separate it by releasing Connector Lock .Board Connector separation Lift up each edge of left/right. Do not pressure or it can be hurt. replace a new X-BOARD. When LOCK is hurt. When LOCK is broken. .2) X . Lifted condition Be careful to handle LOCK or it can be broken. Separate COF CONNECTOR by pulling in the left. . In case of COF Connector. Module Assembly.3) Y .Board COF Connector separation Pull the white LOCK as shown in arrow Pull the white LOCK as shown in arrow. When LOCK part is damaged. you should replace a new Y-Board. Warning Be careful to handle LOCK and COF Connector. 35/88 LG Electronics / DND / QA Gr. It¶s easy to separate COF on condition that Z-Board Screw is separated. it¶s really hard to separate. In case Z-Board is assembled.Board COF Connector separation Separate the fixed Screw of Z-Board. Warning Condition in Lock part is pulled Pull COF Connector as shown in arrow. Pull out Lock as shown in arrow. replace a new Module Assembly 36/88 LG Electronics / DND / QA Gr. COF Connector Be careful not to tear COF Connector.4) Z . If COF Connector is torn. . 5) Connector separation Guide Push LOCK and pull out PUSH PUSH PUSH PUSH PUSH PULL 37/88 LG Electronics / DND / QA Gr. 6) Control Board & VSC Board Connector 38/88 LG Electronics / DND / QA Gr. 7) Gas injection (Sealing up) condition Be sealed up after gas injection Be sealed up after gas injection Warning Be careful to handle the sealed-up part after gas injection. If it is broken, the gas escapes. So, replace the Module. 39/88 LG Electronics / DND / QA Gr. 8) Power off in 2 ~ 3 minutes(Protection) Power is On and off 2~3 minutes. (Protection) P301 Connector Open Check. OK X - Board Top Right Change. OK P302 Connector Open Check X - Board Top Left Change. P303 Connector Open Check OK X - Board Bottom Right Change. OK P304 Connector Open Check X - Board Bottom Left Change. OK P102 Connector Open Check Z - Board Change. OK P3, P2 Connector Open Check Y - Board Change. P005, P003 Connector Open Check PROTECT operation; When the load voltage is short. When each voltage doesn¶t work (in general) OK VSC- Board Change. OK VSC - Board Change. Sound Output IC Short Check P006 Connector Open Check Power Board Change 40/88 LG Electronics / DND / QA Gr. if each Board is same. Check Open the Connector connecting to each Board to check the power is off. 41/88 LG Electronics / DND / QA Gr. it¶s off in 2 . (PROTECT operation) Cause : No VS voltage L813 Coil cold soldering. check the Power Board and voltage.3minutes.9) Power off in 2 ~ 3 minutes(Protection) L813 Cold Solder Symptom : As soon as the power on. . And if you can¶t find defect.right. . Divide the screen in 4 and once you see ADD BAR check COF CONNECTOR between MODULE and X-BOARD. But the problem still remains and check the connector between X-BOARD and CONTROL BOARD. top and bottom. 42/88 LG Electronics / DND / QA Gr. If there is no defect in COF CONNECTOR replace X-BOARD. check CONTROL.10) ADD BAR inspection and repair Press the ADJ KEY and check the position of add bar by changing WHITE or RED or BLUE or GREEN HEATRUN : WHITE Top Right Top Left Bottom Right Bottom Left MP-40PA10 uses 4 board such as left. .11) One Point Service Guide Symptom : B color 1 Address line Open Cause : Dented COF COF is dented 43/88 LG Electronics / DND / QA Gr. IC14 Cold Soldering Abnormal waveform by cold soldering Normal waveform after tearing off IC pin 44/88 LG Electronics / DND / QA Gr. .Symptom : Inferior R Address color Cause : Inferior DATA output by cold soldering 16 pin of IC14 in X-L-TOP ( Normal waveform after tearing off IC Pin) Countermeasure : Replace X-L-TOP board. check if turning off or not by disconnecting all X & Y boards.Symptom Causes Countermeasure If 15V line voltage reduces below 14V. Mis-discharge occurs and power off because of protection circuit. it will be same problem. 45/88 LG Electronics / DND / QA Gr. screen shows like above and turn off in 2 seconds. Check If when Power on. If you turn on again. . Defective X-Board The blue spreads on the screen (Mis-discharge) and power off in 2 ~ 3 seconds. Replace PSU (Power Supply Unit) and defective X-Board. (If 0V. Connect 5V line The top left part of screen is broken (Top Right X-BOARD) Check Check Top right X-BOARD 5V. it happens) Check 5V line from SMPS to X-BOARD.Symptom Cause Countermeasure No 5V supply to Top right X-Board. . 46/88 LG Electronics / DND / QA Gr. Connect 70V line Pinkish screen in the top left. (Top right X-BOARD) Check Check Top right X-BOARD Va(70V).Symptom Cause Countermeasure No Va(70V) supply to Top right X-Board. . 47/88 LG Electronics / DND / QA Gr.(If 0V. it happens) Check 70V(Va) line from SMPS to X-BOARD. it happens) Check 12V & 70V(Va) line from SMPS to X-BOARD. .(If 0V.( If 0V.Symptom Cause Countermeasure No 12V supply to Top right X-Board. No Va(70V) supply to Top right X-Board. it happens ) Check Top right X-BOARD Va(70V). Connect 12V line Connect 70V line The 3/5 top left in the screen is blank (Top Right X-BOARD) Check Check Top right X-BOARD 12V. 48/88 LG Electronics / DND / QA Gr. ( If 0V. (Top left X-BOARD) Check Check Top left X-BOARD 12V. Connect 12V line Connect 70V line The 3/5 top right of the screen is blank. it happens ) Check Top left X-BOARD Va(70V). 49/88 LG Electronics / DND / QA Gr. No Va(70V) supply to Top left X-Board. it happens) Check 12V & Va(70V) line from SMPS to X-BOARD. .Symptom Cause Countermeasure No 12V supply to Top left X-Board.(If 0V. Symptom Cause Countermeasure P1 COF connector on Top left X-Board is open. 50/88 LG Electronics / DND / QA Gr. Reassemble it Pinkish screen in the 1/5 top right (Top left X-BOARD) Check Check the contact point and Locking of P1 on Top left X-BOARD. . Connect 5V line The 3/5 bottom left of screen is broken. .( If 0V.Symptom Cause Countermeasure No 5V supply to bottom right X-Board. (BOTTOM RIGHT X-BOARD) Check Check Bottom right X-BOARD 5V. 51/88 LG Electronics / DND / QA Gr. it happens ) Check 5V line from SMPS to X-BOARD. Connect 12V line The 3/5 bottom left of the screen is Blank.Symptom Cause Countermeasure No 12V supply to bottom right X-Board.( If 0V. it happens ) Check 12V line from SMPS to X-BOARD. (Bottom Right X-BOARD) Check Check Bottom right X-BOARD 12V. No Va(70V) supply to bottom right X-Board. 52/88 LG Electronics / DND / QA Gr. . it happens ) Check 5V line from SMPS to X-BOARD.Symptom Cause Countermeasure No 5V supply to bottom left X-Board. Connect 5V line The 2/5 right of the screen is broken. 53/88 LG Electronics / DND / QA Gr. (Bottom left X-BOARD) Check Check Bottom left X-BOARD 5V. .( If 0V. . (Bottom left X-BOARD ) Check Check Bottom left X-BOARD 12V.Symptom Cause Countermeasure No 12V supply to bottom left X-Board. 54/88 LG Electronics / DND / QA Gr. Connect 12V line The 2/5 right part of the screen is blank.( If 0V. it happens ) Check 12V line from SMPS to X-BOARD. 55/88 LG Electronics / DND / QA Gr. . ADDRESS bar appears in the right bottom of the screen. (X-BOARD BOTTOM LEFT) Check Check connecting of the connector of bottom left X-BOARD. X-BOARD BOTTOM LEFT CONNECTOR OPEN. Reassemble it. Reassemble it.Symptom Cause Countermeasure The connecting of X-Board bottom left connector is bad. .Examples 56/88 LG Electronics / DND / QA Gr. . P13 CONNECTOR SIGNAL CHEK. P13 CONNECTOR 57/88 LG Electronics / DND / QA Gr. Check P13 CONNECTOR contact point inferior CHECK.Symptom Cause Countermeasure Connector(P13) is OPEN or Connecting condition is bad Reassemble P13. and vertical bar appears. Screen is divided in top and bottom. Reassemble VSC Board Connector Screen is broken and has the vertical/horizontal bar.Symptom Cause Countermeasure VSC Board Connector is Open. Check Check the connector connecting Reassemble the Connector 58/88 LG Electronics / DND / QA Gr. . Symptom Cause Countermeasure Loose VSC Board Connector Reassemble VSC BOARD Connector The screen is bluish(Mosaic screen) Check Check the connection condition of the Connector. 59/88 LG Electronics / DND / QA Gr. . Reassemble the Connector. (The sensibility of Y-signal is low. Check Check if X201 on VSC board oscillates. IC201 (VPC3230D) Decoder IC LG Electronics / DND / QA Gr.) When connected to Component Input.Symptom Cause Countermeasure Bad IC203 Replace IC203(VPC3230D) The mosaic appears in the screen when it connects to VIDEO Input. 60/88 . Check Video In/Out of IC203 on VSC board.K. it is O. Examples IC201(VPC3230D) Decoder is inferior 61/88 LG Electronics / DND / QA Gr. . Bad Connector LG Electronics / DND / QA Gr.Symptom Cause Countermeasure Bad Connector connecting Control Board and VSC B/D. Change the Connector Abnormal Noise with division of colors Normal Check Contact point and signal condition of Connector Control Board and VSC Board. 62/88 . . In this case.Name No signal Vertical Bar Symptom Cause and Countermeasure 1.5V Output(Normal Pin = 2. 63/88 LG Electronics / DND / QA Gr.Cause : Bad IC2 (DA1) IC2 DA1(Data Arrange) No.8V) * Heated : 1. you can observe it (In normal temperature it¶s O. ) Buffer(74ACT541) waveform abnormally narrows.5V Output (Normal Pin = over 2.K.162 Pin output is changing depending on the temperature. abnormal X-B¶d Buffer IC * Room temperature : 2. it is impossible for Flip Flop(74AC574) on X B/D to read data. Countermeasure : Replace IC2 < Waveform of normal pin> heated < Waveform of abnormal pin > heated 8cm DA1 Buffer DA1 Buffer Realization When ASIC Chip(IC2 DA1 LGD4001) on Control Board gets high temperature.7V ) Bad IC2 (DA1) 2. cause: Add. COF Drive IC inferior Add. COF Drive IC Normal Line Data waveform Open Line Data output waveform the output of inferior line less than that of the normal Line Add. . COF Drive IC inferior COF inspection : 24V Open check (normal 50V) 64/88 LG Electronics / DND / QA Gr.Name Add Open (Green 1 Line) Symptom Cause and Countermeasure 1. 2. 3.after about 20minutes.PDP Power on Mode external input (regardless of wire/wireless signal but it¶s easy to reenact in wireless signal) 2. .Name Vertical bar when Power off/on(Mis-discharge) Symptom Cause and Countermeasure 1.C504.1uF / 50V add (Chip Capacitor) Control board Realization 1. insert Power cord (automatically the Power¶s on and the vertical bar is shown as above) 65/88 LG Electronics / DND / QA Gr. 505 : 0.17.21 : 330 ==> 4.R14.20 : 22K ==> 4. Remove Power Cord (Power¶s off) 3.18.7K (Chip Resistor) -.19.Cause : Control board malfunctions when Power off/on.7K (Chip Resistor) -.16.Changing parts : A32_CTRL_03 B/D (Marked on PCB) -.Countermeasure: Change some parts on Control board.R15. .50 Inch X CANVAS X CANVAS Bottom Center No Picture Normal MODEL : MN-50PZ40S Check Point : Cable & X-Board Symptom : ADD Bar(No signal) Action : Module Control Change 66/88 LG Electronics / DND / QA Gr. .X CANVAS X CANVAS Bottom Center X-Board Normal MODEL : MN-50PZ40S Check Point : X-Board (Bottom) Symptom : ADD Bar Action : X Board Change 67/88 LG Electronics / DND / QA Gr. .X CANVAS X CANVAS Horizontal Bar Normal Check Point : Y-Drive Board Symptom : Horizontal Bar Action : Y-Drive Board Change & Connector Clean 68/88 LG Electronics / DND / QA Gr. 69/88 LG Electronics / DND / QA Gr. -. Turn VR 8501 (Vs Adj )to adjust the voltage on DMM to Vs voltage value marked on panel bottom-right label. Va adjustment -. -. (allowable error : ±0. PFC adjustment -. Vs adjustment -. 2. Connect DMM with TP PFC+ and TP PFC ± (GND).right label. -. Turn VR8401 (Va Adj) to adjust the voltage on DMM to Va voltage value marked on panel bottom. -. Connect DMM + terminal with P814 #1 Pin.60 Inch <SMPS Board> VA Adjust VR8401 TP5 GND Power PCB Voltage Adjustment When replacing PDP module & power board. Be sure to adjust Power Ass¶y voltage. Connect DMM¶s + terminal with P803 # 9 Pin. adjust VR801 to 380V (within ±1V ).5V ) PFC PACK 3. Select 100% White Pattern signal and warm it up enough. . TP6 VA VS Adjust VR8501 TP3 GND TP4 VS DMM + PFC + PFC 380V ± 1V VR801 1. Power Supply Section Power & no Raster AC input check (220V) Connection Plug with set When Main S/W ON. VA PACK Function check Controller Board VS ON check Controller Board replacement each Connector & connection check 70/88 LG Electronics / DND / QA Gr. R8539. ST-BY LED ON check (RED) AC Line Fuse check When SUB S/W on. 5V CTL output check VS. .R8303 replacement R8538. LED GREEN check PFC Board R8301.R8302 R8303 OPEN check R8301.R8540 OPEN check FAN function check 5V MONI.R8302. Sound Section Connector between SP & set check IC601 (MSP3401) check IC603 (LA4282) check Input jack check (25Pin cable L.R input check) Sound power (P806A. .B) Cable connection check Sound terminal Voltage check (32V) F8811 Fuse Open check Speaker connection line check 71/88 LG Electronics / DND / QA Gr. .Video Signal Section Abnormal screen PC signal input IC501 ( JAGASM check ) IC203 ( CXA2101 ) check IC901 (SII 150 ) check) IC406 ( ADV 7123 ) check P901 ( 21 Pin cable ) check IC404 ( FLI2220 ) check IC403 ( FLI2220 )check IC201 (VPC3230 ) check Input jack & Connector check 72/88 LG Electronics / DND / QA Gr. No power X CANVAS X CANVAS No power ( LED is not on in ST-BY) normal AC power voltage check Main Power S/W check F8301 Fuse (15A) check F8301 Fuse (15A) replacement F8302 Fuse check 73/88 LG Electronics / DND / QA Gr. . On-and-off Disappearing or error while watching X CANVAS X CANVAS Intermittent image disappearing. LED¶s green normal Cause : Y-Board VR301 waveform adjustment defect Troubleshooting : Y-Board VR301 Adjust See the next instruction(improved since Dec. .2001) 74/88 LG Electronics / DND / QA Gr. Board 75/88 LG Electronics / DND / QA Gr.Auto power off Automatic off as soon as power is on ( Protect ) X CANVAS X CANVAS Automatic off after 2~3 seconds ( Protect ) normal Cause : X-Board internal IC Short Troubleshooting: replace the defective X-Board & DC-DC Board *. . X . Remove X ± Board power supply connector to check whether power is off. Board LG Electronics / DND / QA Gr.Auto power off Automatic off as soon as power is on ( Protect ) X CANVAS X CANVAS Automatic off after 2 ± 3 seconds ( Protect ) normal Cause : Y ± Board 220V Line Short Troubleshooting : Y ± Board replacement *. . Remove Y ± Board power supply connector to check Whether power is off. 76/88 Y . .Address Bar(Horizontal) X CANVAS X CANVAS One horizontal line in the top part normal Y-Board & Y-Drive Board Connector check Y-Drive Board ( Top ) Drive IC check Y-Drive Board replacement 77/88 LG Electronics / DND / QA Gr. Address Bar(Horizontal) X CANVAS X CANVAS Single horizontal bar in the bottom normal X CANVAS Y-Board & Y-Drive Board Connector check Y-Drive Board ( Bottom ) Drive IC check Y-Drive Board replacement 78/88 LG Electronics / DND / QA Gr. . . LED¶s green normal Y-Board & Y-Drive Board Connector check Y-Drive Board ( Top ) Drive IC check Y-Drive Board replacement 79/88 LG Electronics / DND / QA Gr.Address Bar(Horizontal) X CANVAS X CANVAS Image is on and off. .Address Bar(Horizontal) X CANVAS X CANVAS Green dot line on the screen normal VSC Board & Controller Board Connector check Controller Board check Controller Board replacement 80/88 LG Electronics / DND / QA Gr. ( Red Pattern reception ) X-Board COF Drive IC check X CANVAS X-Board Connector check X-Board replacement Module ( Panel )replacement 81/88 LG Electronics / DND / QA Gr.Address Bar(Vertical) X CANVAS X CANVAS Address Bar. . (Gray Pattern reception) Address Bar. Address Bar(Vertical) X CANVAS X CANVAS Intermittent image disappearing. LED is green image distorted (occurring twice a day) X-Board COF Drive IC check X CANVAS X-Board Connector check X-Board replacement Module ( Panel )replacement normal 82/88 LG Electronics / DND / QA Gr. . Address Bar(Vertical) Address Bar ( Vertical ) & partial no-picture X CANVAS X CANVAS Central top 4/10 of the screen with vertical bar related X-Board power supply voltage check Central top 4/10 of screen with no-picture X CANVAS related X-Board Connector check related X-Board & Controller Board Connector check related X-Board replacement normal 83/88 Module (Panel ) check LG Electronics / DND / QA Gr. . Address Bar(Vertical) Address Bar ( Vertical ) & partial no-picture X CANVAS X CANVAS Bottom left 3/10 of the screen with vertical bar Related X-Board power supply voltage check Related X-Board Connector check Bottom left 3/10 of the screen with no-picture X CANVAS Related X-Board & Controller Board Connector check Related X-Board replacement Module (Panel ) check 84/88 normal LG Electronics / DND / QA Gr. . Address Bar(Vertical) Address Bar ( Vertical ) & partial no-picture X CANVAS X CANVAS Bottom right 3/10 of the screen with vertical bar related X-Board power supply voltage check Related X-Board Connector check Bottom right 3/10 of the screen with no-picture X CANVAS Related X-Board & Controller Board Connector check Related X-Board replacement Module (Panel ) check 85/88 normal LG Electronics / DND / QA Gr. . .Address Bar(Vertical) Address Bar ( Vertical ) & partial no-picture X CANVAS X CANVAS Central bottom 4/10 of the screen with vertical bar Related X-Board power supply voltage check Related X-Board Connector check Central bottom 4/10 of the screen with no-picture X CANVAS Related X-Board & Controller Board Connector check Related X-Board replacement Module (Panel ) check 86/88 normal LG Electronics / DND / QA Gr. .Address Bar(Vertical) Address Bar ( Vertical ) & partial no-picture X CANVAS X CANVAS Top right 3/10 of the screen with vertical bar Related X-Board power supply voltage check Related X-Board Connector check Top right 3/10 of the screen with no-picture X CANVAS Related X-Board & Controller Board Connector check Related X-Board replacement Module (Panel ) check 87/88 normal LG Electronics / DND / QA Gr. .Address Bar(Vertical) Address Bar ( Vertical ) & partial no-picture X CANVAS X CANVAS Top left 3/10 of the screen with vertical bar Related X-Board power supply voltage check Related X-Board Connector check Top left 3/10 of the screen with no-picture X CANVAS Related X-Board & Controller Board Connector check Related X-Board replacement Module (Panel ) check 88/88 normal LG Electronics / DND / QA Gr.


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