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LG FLATRON Plasma MN-50PZ40S Repair Manual
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LG FLATRON Plasma MN-50PZ40S Repair Manual

Pdp one point
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PDP One Point Repair Guide
PDP One Point Repair Guide
1. 1. General
General
2. 2. 40 ~ 50 Inch Practice
40 ~ 50 Inch Practice
3. 3. 60 Inch Practice
60 Inch Practice
1

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Summary of Contents for LG FLATRON Plasma MN-50PZ40S

  • Page 1 PDP One Point Repair Guide PDP One Point Repair Guide 1. 1. General General 2. 2. 40 ~ 50 Inch Practice 40 ~ 50 Inch Practice 3. 3. 60 Inch Practice 60 Inch Practice...
  • Page 2 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 LG Electronics / DND / QA Gr. 2/88...
  • Page 3 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. LG Electronics / DND / QA Gr. 3/88...
  • Page 4 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. LG Electronics / DND / QA Gr. 4/88...
  • Page 5 White Screen(Different color display) ←Pay attention to a capillary symptom ↓ Check Point 1. Trace defected line 2. Check the condition of FPC and connector on the X-Board, IC Output stage and Electrode line. LG Electronics / DND / QA Gr. 5/88...
  • Page 6 ⇒ 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, IC Output stage and Electrode line. LG Electronics / DND / QA Gr. 6/88...
  • Page 7 2. Check the connection status of Panel side. 3. Check the connection condition of connector of Panel side and the FPC at upper ACF. → If it is OK, check Panel pad LG Electronics / DND / QA Gr. 7/88...
  • Page 8 ADD short : Different color → Board defect, in case of one line, check the output stage of Drive IC(Cold soldering/Pattern) vertical bar at If problems in input stage, several lines display Raster LG Electronics / DND / QA Gr. 8/88...
  • Page 9 2. Check X Board(Open or Short circuit) 3. Check the connection condition(conncetion status, foreign material at connector, etc) 4. Check the drive IC at X Board(If defected, change the Board) 5. Confirm the connection of the connector LG Electronics / DND / QA Gr. 9/88...
  • Page 10 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, several lines are defected at one point ▶ Replace the X Board of defected point LG Electronics / DND / QA Gr. 10/88...
  • Page 11 Pattern line1 line2 line3 ▶ PCB pattern is connected minutely line4 → Foreign material when photo resisting Check Point 1. Check the connection condition of the Connector. 2. Check the cold soldering. LG Electronics / DND / QA Gr. 11/88...
  • Page 12 Control board Check Point 1. Measure the resistance of Via holes between U3 and U300 at Control Board and compare with that of normal.(Normal : 2~3 Ω) 2. Resistance increases as temperature rises. LG Electronics / DND / QA Gr. 12/88...
  • Page 13 - Resistance between two pins varies from 19 ohm ~ 45Kohm Check Point 1. Observe the symptom during Heat-Run at 45 degree. 2. Check the resistance of VIA holes of suspect ICs LG Electronics / DND / QA Gr. 13/88...
  • Page 14 1. Check D1, D3 & D4 on Control Board - D1 : ON with 5V - D3 : ON when PROM finishes program download from ALTERA chip - D4 : ON when signal is applied LG Electronics / DND / QA Gr. 14/88...
  • Page 15 No signal or at PC mode, dark red raster displays. touch This is darker than normal Red signal. Check Point - TV VSC board - Board connector(50 pin) contact point - Control board of Module LG Electronics / DND / QA Gr. 15/88...
  • Page 16 2. Separate SMPS Board and VSC Board and check all voltage output stage 3. Check FET, TR, Diode and Resistor(especially Cement Resistor) 4. Observe PCB Pattern and soldering condition with naked eyes LG Electronics / DND / QA Gr. 16/88...
  • Page 17 42” PDP Flicker and No Raster Troubleshooting No Raster Troubleshooting Guide 42” PDP Flicker and Guide cause : bad connection between Y-Board # 1, 2 drive board Connector pin Rework should be done Y-Driver Board Y-Board LG Electronics / DND / QA Gr.
  • Page 18 ① (bend the wire to Y-Driver B/D not ② to Y-B/D . If not there can be noise) ① • Don’t be confused with Pin number ② • Improved since Dec,2001. LG Electronics / DND / QA Gr.
  • Page 19 ① ① ② ② ① ② ① ② Be sure not to misconnect the line. See the picture precisely and then connect jump wire at the exact point LG Electronics / DND / QA Gr.
  • Page 20 : 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,2001. normal LG Electronics / DND / QA Gr.
  • Page 21 ( in ST-BY mode, but no LED) 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 LG Electronics / DND / QA Gr.
  • Page 22 When using ANALOG STB, check STB only MN-42PZ10 only STB : RN-BA11 Remove each Board’s power supply connector and check the power is off. When the power is not off,replace the related board. LG Electronics / DND / QA Gr.
  • Page 23 (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, check VSC and then Controller Board. Troubleshooting : replace VSC Board LG Electronics / DND / QA Gr.
  • Page 24 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 ) LG Electronics / DND / QA Gr.
  • Page 25 Address Bar ( Horizontal Bar ) CANVAS CANVAS no image (LED’s green) normal Y-Drive Board ( Top ) Cause : Y-Drive Board (upper part) defect Troubleshooting : Y-Drive Board replacement LG Electronics / DND / QA Gr.
  • Page 26 CANVAS 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, Various defect symptoms can be seen) LG Electronics / DND / QA Gr.
  • Page 27 Open C8139 right C8178 0.22uF R8164 right lead. lead and then electrolytic wire R8164 right Improved since Nov,2001 capacitor insertion lead #. Slight noise is not a defect and write down explanation LG Electronics / DND / QA Gr.
  • Page 28 No picture in right- 2/5 area CANVAS CANVAS No picture in the right- 2/5 area normal X-Board ( Left ) power supply check X-Board ( Left )Connector check X-Board ( Left ) replacement LG Electronics / DND / QA Gr.
  • Page 29 Address Bar (Vertical ) CANVAS CANVAS stripe in right-2/5 area normal X-Board ( Left ) power supply check X-Board ( Left ) Connector check X-Board ( Left ) replacement LG Electronics / DND / QA Gr.
  • Page 30 No picture in left 3/5 of the screen CANVAS 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 LG Electronics / DND / QA Gr.
  • Page 31 Address Bar (Vertical ) CANVAS 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 LG Electronics / DND / QA Gr.
  • Page 32 If it has a problem with STB connecting, focus on 25 Pin. 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. LG Electronics / DND / QA Gr.
  • Page 33 When you exchange X-Board, first you should separate COF Connector. Be careful to handle it. COF Connector is attached to Module. When COF Connector is broken, Module ASS’Y must be replaced a new one. LG Electronics / DND / QA Gr.
  • Page 34 When LOCK is broken, replace a new X-BOARD. Warning It’s easy to separate it by releasing Connector Lock . Do not pressure or it can be hurt. When LOCK is hurt, replace a new X-BOARD LG Electronics / DND / QA Gr.
  • Page 35 Separate COF CONNECTOR by pulling in the left. Warning Be careful to handle LOCK and COF Connector. When LOCK part is damaged, you should replace a new Y-Board. In case of COF Connector, Module Assembly. LG Electronics / DND / QA Gr.
  • Page 36 Z-Board Screw is separated. COF Connector Warning In case Z-Board is assembled, it’s really hard to separate. Be careful not to tear COF Connector. If COF Connector is torn, replace a new Module Assembly LG Electronics / DND / QA Gr.
  • Page 37 5) Connector separation Guide Push LOCK and pull out PUSH PUSH PUSH PUSH PULL PUSH LG Electronics / DND / QA Gr.
  • Page 38 6) Control Board & VSC Board Connector LG Electronics / DND / QA Gr.
  • Page 39 Be sealed up after gas injection Be sealed up after gas injection Be careful to handle the sealed-up part after gas injection. Warning If it is broken, the gas escapes. So, replace the Module. LG Electronics / DND / QA Gr.
  • Page 40 VSC- Board Change. PROTECT operation; VSC - Board Change. P006 Connector Open Check Sound Output IC Short Check When the load voltage is short. Power Board Change When each voltage doesn’t work (in general) LG Electronics / DND / QA Gr.
  • Page 41 Cause : No VS voltage L813 Cold Solder L813 Coil cold soldering. Check Open the Connector connecting to each Board to check the power is off. if each Board is same, check the Power Board and voltage. LG Electronics / DND / QA Gr.
  • Page 42 If there is no defect in COF CONNECTOR replace X-BOARD. But the problem still remains and check the connector between X-BOARD and CONTROL BOARD. And if you can’t find defect, check CONTROL. Bottom Left Bottom Right LG Electronics / DND / QA Gr.
  • Page 43 11) One Point Service Guide Symptom : B color 1 Address line Open Cause : Dented COF COF is dented LG Electronics / DND / QA Gr.
  • Page 44 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. IC14 Cold Soldering Abnormal waveform by cold soldering Normal waveform after tearing off IC pin LG Electronics / DND / QA Gr.
  • Page 45 If you turn on again, it will be same problem. Check If when Power on, screen shows like above and turn off in 2 seconds, check if turning off or not by disconnecting all X & Y boards. LG Electronics / DND / QA Gr.
  • Page 46 No 5V supply to Top right Connect 5V line X-Board. The top left part of screen is broken (Top Right X-BOARD) Check Check Top right X-BOARD 5V.(If 0V, it happens) Check 5V line from SMPS to X-BOARD. LG Electronics / DND / QA Gr.
  • Page 47 No Va(70V) supply to Top Connect 70V line right X-Board. Pinkish screen in the top left. (Top right X-BOARD) Check Check Top right X-BOARD Va(70V).(If 0V, it happens) Check 70V(Va) line from SMPS to X-BOARD. LG Electronics / DND / QA Gr.
  • Page 48 The 3/5 top left in the screen is blank (Top Right X-BOARD) Check Check Top right X-BOARD 12V.( If 0V, it happens ) Check Top right X-BOARD Va(70V).(If 0V, it happens) Check 12V & 70V(Va) line from SMPS to X-BOARD. LG Electronics / DND / QA Gr.
  • Page 49 The 3/5 top right of the screen is blank. (Top left X-BOARD) Check Check Top left X-BOARD 12V.( If 0V, it happens ) Check Top left X-BOARD Va(70V).(If 0V, it happens) Check 12V & Va(70V) line from SMPS to X-BOARD. LG Electronics / DND / QA Gr.
  • Page 50 P1 COF connector on Top left Reassemble it X-Board is open. 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. LG Electronics / DND / QA Gr.
  • Page 51 Connect 5V line X-Board. The 3/5 bottom left of screen is broken. (BOTTOM RIGHT X-BOARD) Check Check Bottom right X-BOARD 5V.( If 0V, it happens ) Check 5V line from SMPS to X-BOARD. LG Electronics / DND / QA Gr.
  • Page 52 No Va(70V) supply to bottom right X-Board. The 3/5 bottom left of the screen is Blank. (Bottom Right X-BOARD) Check Check Bottom right X-BOARD 12V.( If 0V, it happens ) Check 12V line from SMPS to X-BOARD. LG Electronics / DND / QA Gr.
  • Page 53 Connect 5V line X-Board. The 2/5 right of the screen is broken. (Bottom left X-BOARD) Check Check Bottom left X-BOARD 5V.( If 0V, it happens ) Check 5V line from SMPS to X-BOARD. LG Electronics / DND / QA Gr.
  • Page 54 Connect 12V line X-Board. The 2/5 right part of the screen is blank. (Bottom left X-BOARD ) Check Check Bottom left X-BOARD 12V.( If 0V, it happens ) Check 12V line from SMPS to X-BOARD. LG Electronics / DND / QA Gr.
  • Page 55 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. Reassemble it. X-BOARD BOTTOM LEFT CONNECTOR OPEN. LG Electronics / DND / QA Gr.
  • Page 56 Examples LG Electronics / DND / QA Gr.
  • Page 57 Connector(P13) is OPEN or Reassemble P13. Connecting condition is bad Screen is divided in top and bottom, and vertical bar appears. Check P13 CONNECTOR contact point inferior CHECK. P13 CONNECTOR SIGNAL CHEK. P13 CONNECTOR LG Electronics / DND / QA Gr.
  • Page 58 Symptom Cause Countermeasure VSC Board Connector is Open. Reassemble VSC Board Connector Screen is broken and has the vertical/horizontal bar. Check Check the connector connecting Reassemble the Connector LG Electronics / DND / QA Gr.
  • Page 59 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. Reassemble the Connector. LG Electronics / DND / QA Gr.
  • Page 60 (The sensibility of Y-signal is low.) When connected to Component Input, it is O.K. Check Check if X201 on VSC board oscillates. Check Video In/Out of IC203 on VSC board. IC201 (VPC3230D) Decoder IC LG Electronics / DND / QA Gr.
  • Page 61 Examples IC201(VPC3230D) Decoder is inferior LG Electronics / DND / QA Gr.
  • Page 62 Bad Connector connecting Control Board and VSC B/D. Change the Connector Abnormal Normal Noise with division of colors Check Contact point and signal condition of Connector Control Board and VSC Board. Bad Connector LG Electronics / DND / QA Gr.
  • Page 63 When ASIC Chip(IC2 DA1 LGD4001) on Control Board gets high temperature, you can observe it (In normal temperature it’s O.K. ) Buffer(74ACT541) waveform abnormally narrows. →In this case, it is impossible for Flip Flop(74AC574) on X B/D to read data. LG Electronics / DND / QA Gr.
  • Page 64 Open Line Data output waveform Normal Line Data waveform ▶ the output of inferior line less than that of the normal Line Add. COF Drive IC inferior ▶ COF inspection검사기 : 24V Open check (normal 50V) LG Electronics / DND / QA Gr.
  • Page 65 (regardless of wire/wireless signal but it’s easy to reenact in wireless signal) 2. Remove Power Cord (Power’s off) 3.after about 20minutes, insert Power cord (automatically the Power’s on and the vertical bar is shown as above) LG Electronics / DND / QA Gr.
  • Page 66 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 LG Electronics / DND / QA Gr.
  • Page 67 X CANVAS X CANVAS Bottom Center X-Board Normal MODEL : MN-50PZ40S Check Point : X-Board (Bottom) Symptom : ADD Bar Action : X Board Change LG Electronics / DND / QA Gr.
  • Page 68 X CANVAS X CANVAS Horizontal Bar Normal Check Point : Y-Drive Board Symptom : Horizontal Bar Action : Y-Drive Board Change & Connector Clean LG Electronics / DND / QA Gr.
  • Page 69 3. Vs adjustment -. Connect DMM’s + terminal with P803 # 9 Pin. -. Turn VR 8501 (Vs Adj )to adjust the voltage on DMM to Vs voltage value marked on panel bottom-right label. LG Electronics / DND / QA Gr.

  • Page 70: Power Supply Section

    R8303 OPEN check R8538, R8539,R8540 FAN function check 5V MONI, 5V CTL output check OPEN check VS, VA PACK Controller Board Controller Board replacement Function check VS ON check each Connector & connection check LG Electronics / DND / QA Gr.

  • Page 71: Sound Section

    IC601 (MSP3401) check IC603 (LA4282) check & set check (25Pin cable L,R input check) Sound terminal Sound power (P806A,B) F8811 Fuse Open Speaker connection Voltage check Cable connection check check line check (32V) LG Electronics / DND / QA Gr.
  • Page 72 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 LG Electronics / DND / QA Gr.
  • Page 73 No power CANVAS CANVAS normal No power ( LED is not on in ST-BY) AC power voltage check Main Power S/W check F8301 Fuse (15A) check F8301 Fuse (15A) replacement F8302 Fuse check LG Electronics / DND / QA Gr.
  • Page 74 On-and-off Disappearing or error while watching CANVAS CANVAS normal Intermittent image disappearing. LED’s green Cause : Y-Board VR301 waveform adjustment defect Troubleshooting : Y-Board VR301 Adjust See the next instruction(improved since Dec,2001) LG Electronics / DND / QA Gr.

  • Page 75: Auto Power Off

    Automatic off after 2~3 seconds ( Protect ) Cause : X-Board internal IC Short Troubleshooting: replace the defective X-Board & DC-DC Board *. Remove X – Board power supply connector to check X - Board whether power is off. LG Electronics / DND / QA Gr.
  • Page 76 Automatic off after 2 – 3 seconds ( Protect ) Cause : Y – Board 220V Line Short Troubleshooting : Y – Board replacement *. Remove Y – Board power supply connector to check Whether power is off. Y - Board LG Electronics / DND / QA Gr.
  • Page 77 Address Bar(Horizontal) CANVAS 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 LG Electronics / DND / QA Gr.
  • Page 78 Address Bar(Horizontal) CANVAS CANVAS normal Single horizontal bar in the bottom CANVAS Y-Board & Y-Drive Board Connector check Y-Drive Board ( Bottom ) Drive IC check Y-Drive Board replacement LG Electronics / DND / QA Gr.
  • Page 79 Address Bar(Horizontal) CANVAS CANVAS normal Image is on and off. LED’s green Y-Board & Y-Drive Board Connector check Y-Drive Board ( Top ) Drive IC check Y-Drive Board replacement LG Electronics / DND / QA Gr.
  • Page 80 Address Bar(Horizontal) CANVAS CANVAS normal Green dot line on the screen VSC Board & Controller Board Connector check Controller Board check Controller Board replacement LG Electronics / DND / QA Gr.
  • Page 81 Address Bar(Vertical) CANVAS CANVAS Address Bar. (Gray Pattern reception) Address Bar. ( Red Pattern reception ) CANVAS X-Board COF Drive IC check X-Board Connector check X-Board replacement Module ( Panel )replacement LG Electronics / DND / QA Gr.
  • Page 82 Address Bar(Vertical) CANVAS CANVAS Intermittent image disappearing. LED is green image distorted (occurring twice a day) CANVAS X-Board COF Drive IC check X-Board Connector check X-Board replacement Module ( Panel )replacement normal LG Electronics / DND / QA Gr.
  • Page 83 Central top 4/10 of screen with no-picture CANVAS related X-Board power supply voltage check related X-Board Connector check related X-Board & Controller Board Connector check related X-Board replacement Module (Panel ) check normal LG Electronics / DND / QA Gr.
  • Page 84 Bottom left 3/10 of the screen with no-picture Related X-Board power supply voltage check CANVAS Related X-Board Connector check Related X-Board & Controller Board Connector check Related X-Board replacement Module (Panel ) check normal LG Electronics / DND / QA Gr.
  • Page 85 Bottom right 3/10 of the screen with vertical bar CANVAS related X-Board power supply voltage check Related X-Board Connector check Related X-Board & Controller Board Connector check Related X-Board replacement Module (Panel ) check normal LG Electronics / DND / QA Gr.
  • Page 86 Central bottom 4/10 of the screen with no-picture CANVAS Related X-Board power supply voltage check Related X-Board Connector check Related X-Board & Controller Board Connector check Related X-Board replacement Module (Panel ) check normal LG Electronics / DND / QA Gr.
  • Page 87 Top right 3/10 of the screen with no-picture CANVAS Related X-Board power supply voltage check Related X-Board Connector check Related X-Board & Controller Board Connector check Related X-Board replacement Module (Panel ) check normal LG Electronics / DND / QA Gr.
  • Page 88 Top left 3/10 of the screen with vertical bar CANVAS Related X-Board power supply voltage check Related X-Board Connector check Related X-Board & Controller Board Connector check Related X-Board replacement Module (Panel ) check normal LG Electronics / DND / QA Gr.