Daewoo DP-42GM Service Manual

Daewoo DP-42GM Service Manual

42" plasma pdp monitor
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S/M No. : DSP115BEF0

Service Manual

42" PLASMA PDP MONITOR
CHASSIS : SP-115
DAEWOO ELECTRONICS Corp.
http : //svc.dwe.co.kr
Nov. 2002

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Table of Contents
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Summary of Contents for Daewoo DP-42GM

  • Page 1: Service Manual

    S/M No. : DSP115BEF0 Service Manual 42" PLASMA PDP MONITOR CHASSIS : SP-115 DAEWOO ELECTRONICS Corp. http : //svc.dwe.co.kr Nov. 2002...
  • Page 2: Table Of Contents

    Contents 1.Safety Precaution 2. Product Specification 2-1. SPECIFICATION 2-2. Available Input Signal 3. BLOCK DIAGRAM 4. Description Of Each BLOCK 4-1. A/V BLOCK 4-1-1. A/V BLOCK DIAGRAM 4-1-2. VIDEO PCB 4-1-3. JACK PCB 4-1-4. KEY PCB 4-1-5. LED PCB 4-2. DRIVING BLOCK 4-2-1.
  • Page 3 9. Main PCB Trouble Diagnosis 9-1. VIDEO & JACK PCB Trouble Diagnosis 9-2. DIGITAL PCB Trouble Diagnosis FIG<9-1>. DIGITAL PCB LAYOUT 9-3. X-SUS PCB Trouble Diagnosis 9-4. Y-SUS & SCAN PCB Trouble Diagnosis 9-5. CONNECTION PCB & DATA COF Trouble Diagnosis 9-6.
  • Page 4 FIG <23>. Y-SUS & SCAN PCB DIODE TEST FIG <24>. SCANH PCB DIODE TEST FIG <25>. SCANL PCB DIODE TEST FIG <26>. 5 STEP GRAY SCALE PATTERN 14. Trouble Symptom Picture Trouble Symptom Picture<1>. Trouble Symptom Picture <2>. Trouble Symptom Picture <3>. Trouble Symptom Picture <4>.
  • Page 5: Safety Precaution

    (1) When moving or laying down a PDP Set, at least two people must be working. Avoid any impact towards the PDP Set. (2) Do not leave the broken PDP Set on for a long time. To prevent any further damages, after check the broken Set s condition, make sure to turn the power (AC) off.
  • Page 6: Product Specification

    2-1. PRODUCT SPECIFICATION I T E M S P E C I F I C A T I O N REMARK 1. GENERAL 1-1. MODEL NO DSP-4280GM(G, W, S) 1-2. CHASSIS NO SP-115 1-3. SCREEN SIZE 42 (16:9) 1-4. COUNTRY WORLD WIDE 1-5.
  • Page 7 I T E M S P E C I F I C A T I O N REMARK 4. OPTICAL 4-1. SCREEN SIZE 42 (106Cm) DIAGONAL 4-2. ASPECT RATIO 16:9 4-3. NUMBER OF PIXELS 853(H)X480(V) 4-4. DISPLAY COLOR 16.77 Million Colors ( 8BIT per each R,G,B) 4-5.
  • Page 8: Available Input Signal

    2-2. Available Input Signal (1) PC Resolution H Freq. (KHz) V Freq. (Hz) Remark Patt No. 640x350 31.469 70.1 37.861 85.1 VESA 640x400 24.823 56.4 30.48 60.0 31.469 70.1 IBM (DOS) 37.861 85.1 VESA 640x480 31.469 59.9 66.7 Macintosh 37.861 72.8 VESA 37.5...
  • Page 9 Resolution H Freq. (KHz) V Freq. (Hz) Remark Patt No. 1280X1024 46.433 43.4 VESA 63.981 60.0 VESA 70.66 66.5 74.88 70.0 78.125 72.0 HP & HITA 78.855 74.1 Sony & NEC 79.976 75.0 VESA 81.13 76.1 91.146 85.0 VESA 1600X1200 62.5 48.0 VESA...
  • Page 10: Block Diagram

    -10-...
  • Page 11: Description Of Each Block

    4-1. A/V BLOCK 4-1-1. A/V BLOCK DIAGRAM P601 P602 P603 STB5V S_RESET V_MUTE IC600 IC406 V_MUTE VCLK PW171 DPTV-MVS S_RESET VPEN1 VPEN DIGITAL GBLKSLP GPEN GSOG DECOE GHSFOUT GREF GCOAST DCLK DCLKB IC401 SAA7118 STB5V GCLK IC500 CCOMB CXA3516 to PWR PWR_CLT YCOMB LED_P...
  • Page 12: Video Pcb

    4-1-2.VIDEO PCB - PROCESS Various Signal (PC, COMPONENT, COMPOSITE ) to produce 24BIT DIGITAL output 1) IC and TP (1) IC400(UPD64083) -Using 3D COMBFILTER to separate COMPOSITE signal to Brightness Signal(Y) and Color Signal(C) *TP ( Input : COLOR BAR PATTERN ) A.
  • Page 13 (3) IC406(DPTV-MVS) -A Scan Rate Converter which converts Interlace signal into Progressive signal A. VVS : VERTICAL SYNC (output by DPTV-MVS) B. VHS : HORIZONTAL SYNC (output by DPTV-MVS) C. VCLK : CLOCK (output by DPTV-MVS) -13-...
  • Page 14 (4) IC500(CXA3516R) -3-channel 8-bit 165MSPS A/D converter which process PC , DTV signal * TP A. GCOAST : COAST CONTOL Signal for PLL (input by CXA3516) B .GHS : HORIZONTAL SYNC for GRAPHIC (output by CXA3516) C. GCLK : CLOCK for GRAPHIC (output by CXA3516) -14-...
  • Page 15 D. GFBK : SYNC for PLL (5) IC600(PW171) - Image processor IC A. DEN : DATA ENABLE (output by PW171) B. DHS : HORIZONTAL SYNC (output by PW171) -15-...
  • Page 16: Jack Pcb

    C.DVS : VERTICAL SYNC for DISPLAY (output by PW171) D. DCLKB : CLOCK for DISPLAY (output by PW171) 4-1-3. JACK PCB - Separate and process various VIDEO and AUDIO signal (1) IC706(VIDEO /SYNC SELECTOR) - This chooses Y Cb/Pb Cr/Pr or RGB signal to output Y Cb/Pb Cr/Pr, to separate SYNC, and to perform SYNC COUNTER.
  • Page 17: Key Pcb

    R_OUT(L_OUT) : AUDIO SIGNAL that goes into MSP3420 before AUDIO PROCESSING (4) IC701 .IC700 (TDA 7480) A. RIGHT(LEFT) :AMP input signal before 30dB amplification 4-1-4.KEY PCB - Input PCB using KEY 4-1-5.LED PCB - PCB for REMOCON CONTROL -17-...
  • Page 18: Driving Block

    4-2 DRIVING BLOCK 4-2-1. Driving BLOCK DIAGRAM SCAN DATA Y-SUSTAIN INPUT TIMING ENERGY X-SUSTAIN CNOTROL PANEL RECOVERY ENERGY & SCAN RECOVERY DATA ERASE SHELF CONTROL SCAN INTERFACE WRITING SIGNAL BOTTOM Verase Vsus DATA DRIVER Vadd Vsus POWER Vadd Vstb/Video/etc. Driving circuit block looks like above diagram. First, within the Digital-board, timing control / data interface signals input to Y / X / DATA-board.
  • Page 19: Driving Waveform

    4-2-2. Driving Waveform Y-DRIVING 1 SUB-FIELD 230V 173V 173V 166V -62V ERASING SCAN X-DRIVING 173V 155V 158V SUSTAINING FULL WRITING X-SHELF ADDRESSING Z-DRIVING PDP Driving signal is largely divided into three(Y, X, Z) as shown above. They are outputs of Y- board, X-board, DATA-board (COF) respectively.
  • Page 20 3) SUSTAINING After the Addressing period, this stage is to add Sustaining pulse to selected cell to make the SUSTAINING discharge continue. For each X, Y-board sustain block, opposite-polarity rectangular pulse which have ER_H SUS_H ER_L SUS_L order, is distributed to Panel s X,Y electrode at a constant frequency. 4) ERASING Removing operation for Electrical discharge inside each cell to address new data in next Sub-field.
  • Page 21: Digital Pcb

    4-2-3. DIGITAL PCB 1st_chip(A500K180) 2nd_chip(A500K270) ID3 & ID4 Inverse Gamma RGB DATA [0:3] Weight SDRAM PISO & Conversion (64M x 2) Dithering SDRAM Controller Detection PDP Driving Timing Controller Data Interface Controller : Data Flow (M27C1024) : Control Address Flow : ROM Data Flow ID33 <DSP-4280GM Digital B/D Block Diagram>...
  • Page 22 (4)50MHz Clock Oscillator : 1 EA - Location No. : XD1 - Power : 3.3V (5)Buffer IC( 74LCX541 ) : 17 EA - Location No. : ID9~25 - Power : 5V - Input Voltage : 3.3V - Output Voltage : 5V (6)Buffer IC( 74LCX541 ) : 4 EA - Location No.
  • Page 23 (4)ROM & ROM Controller Block - ROM contains Reverse Gamma Correction Table , Weight Conversion Table , APL Table and so on. Rom Controller Block generate Address & Control signal for receiving these data from ROM (5)PISO(Parallel Input Serial Output) Block - Load 10 pixels per each R,G,B data with parallel type and shift them with serial type in order of Weight ( LSB first ).
  • Page 24 (4)Sub Control Signal Block - Generate some Control Signals to control Data Interface Block and SDRAM Control Block . There are 5 Control Signals as follows. - F_SUBF, CLK_480, OUT_CLK, F_32SFT, SLCT (5)APL Detection Block - Detect the amount of input Data, which is so-called APL (Average Picture Level), and give APL to Timing Controller Block in order to control Power Consumption of PDP Set.
  • Page 25: X-Sus Pcb

    4-2-4. X-SUS PCB 1) X_SUSTAIN PCB block diagram P201A P202A X_N_ GND Vadd Vsus Vsus Vadd GND GND _HIGH GND GND _ERL _ERH _SUSL _SUSH 5V SHELF X_sustain X_shelf X_ELECTRODES 2) Structure of X_SUSTAIN PCB X_SUSTAIN BLOCK SUS_H / SUS_L / ER_H / ER_L(Energy Recovery Circuit) HIC Structured Vshelf Generating Circuit From Vsus(173V) to X_HIGHT(163V) voltage generating circuit...
  • Page 26 Description Of Each BLOCK 3) Power Supply Vsus - Supplied by POWER MODULE. Supplies X-SUS as well as generates X-HIGHT voltage.(173V) 15V - Supplied by POWER MODULE. Supplies FET driving power as well as generates X_N_SHELF voltage(5V). 5V - Supplied through CONNECTION-board from DIGITAL-board. Used for LOGIC IC Power. 4) Signal X_SUSTAIN SUS_H / SUS_L / ER_H / ER_L (Supplied from P202A)
  • Page 27: Y-Sus & Scan Pcb

    4-2-5. Y-SUS & SCAN PCB 1) Y_SUSTAIN PCB block diagram P101A P103A P102A 15V GND GND ERASE _SUS _SUS GND GND SUSH GND SUSL Scan Y_erase Y_scan Scan IY8/IY27 (PY1) (PY1,4) _Vcc Remp Remp Scan Scan _down (PY1,4) (PY4) &s/w &s/w shelf 15V_Y2...
  • Page 28 2) Y_SUSTAIN PCB Structure SUSTAIN BLOCK SUS_H / SUS_L / ER_H / ER_L (Energy Recovery Circuit) Structured with HIC RAMP_UP , RAMP_DOWN waveform generating circuit RAMP_UP_S/W , RAMP_DOWN_S/W Y_SCAN -62V(based on GND) Applying Circuit Y_SHELF 70V(based on GND) Applying Circuit 166V Applying Circuit RAMP_UP / Y_SCAN_VH / DC-DC converter circuit that generating Y_SCAN_GND s voltage...
  • Page 29: Connection Pcb & Data Cof

    4-2-6. CONNECTION PCB & DATA COF 1) Structure of CONNECTION PCB Divided into 2 PCBs (CONN-LEFT & CONN-RIGHT) CONN-LEFT From DIGITAL PCB through connector P304, data signal and 5V IC Power are supplied. Vadd Power is supplied to PC 5~7 through PC08A. CONN-RIGHT From DIGITAL PCB through connector P304A, data signal and 5V IC Power are supplied.
  • Page 30: Power Block

    4-3. POWER BLOCK 4-3-1. POWER BLOCK DIAGRAM Main B+ 5V out Line Vlow Filter 12V out 30V out 15V out Sequence ST- BY Control 5V out Block 3.3V out IC B+ Vadd Vadd Main B+ Block IC ON/OFF Discharge IC ON/OFF Vsus Vsus Main B+...
  • Page 31: Power Pcb

    4-3-2. POWER PCB Rating : AC100~240 V, Single-Phase Regulation Method : Transistor & Switching Method Rating Input Frequency : 50~60Hz, Inrush Current : under 35A. Output Voltage is as follows. Voltage(Vdc) Current(Adc) Rating Variable Allowable Ripple Ripple Noise When Tolerance Rating Range overshoot...
  • Page 32 * P2 is connected to Y-SUS PCB s P101A P1 is connected to X-SUS PCB s P201A P4 is connected to VIDEO PCB s PA4 P5 is connected to VIDEO PCB s PA5 P3 is connected to DIGITAL PCB s P301A P6 is connected to JACK PCB s PA6.
  • Page 33: Service Mode

    5-1. Entering SERVICE MODE Push Remote controller’s “UP” MUTE DISPLAY MUTE BUTTON to enter SERVICE adjust MODE. 5-2. Default Values fot SERVICE MODE 1) PW171 -SUB-BRIGHTNESS : 28 -SUB-CONTRAST : 40 -R-BIAS : 68 -G-BIAS : 65 -B-BIAS : 70 -R-GAIN : 67 -G-GAIN : 45 -B-GAIN : 78...
  • Page 34: Description Of Service Mode Items

    5) MSP34X0 -PRESCALE : 22 5-3. Description of SERVICE MODE Items 1) PW171 (Note) This article is for adjustment after replacement of VIDEO PCB. These Values may vary from set to set. Therefore if these values are recorded before replacing VIDEO PCB, you do not need to adjust WHITE BALANCE additionally.
  • Page 35 4) CXA3516 (Note) This article is not for adjustment after replacement of VIDEO PCB. Therefore do not change initial values. (1) SUB CONT : Set up CONTRAST standard value of CXA 3516 (2) Cb OFFSET : Set up BLACK LEVEL of Cb CHANNEL (3) Cr OFFSET : Set up BLACK LEVEL of Cr CHANNEL (4) HYS : Set up HYSTERISIS of SYNC (5) THR SLP : Set up THRESHOLE of PEDESTAL LEVEL...
  • Page 36 (1) VER : Displaying Software’s VERSION 8) RESET (1) EDID (2) LEVEL 1 : RESET SERVICE MODE Condition’s All Values. (3) LEVEL 2 : RESET SERVICE MODE Condition’s All Values except PW171 values (4) FACTORY : RESET to factory shipping initialiaztion. -36-...
  • Page 37: Adjusting Method

    6-1. Adjusting WHITE BALANCE (1) Input 5 STEP GRAY SCALE PATTERN to Video Input Terminal. (refer to FIG<26>) (2) Set the SCREEN MODE to NORMAL . (3) Enter SERVICE MODE by inputting remote controller s MUTE DISPLAY => MUTE BUTTON, and then select PW171 and check Default Values of SERVICE MODE Items.
  • Page 38: Adjusting Driving Voltage And Waveform

    6-2. Adjusting Driving Voltage and Waveform 6-2-1. Adjusting POWER PCB (Note.1) Factory adjusted optimum voltage is stated at the LABEL located above the VIDEO PCB. (refer to FIG<1>) (Note.2) After replacing POWER PCB, adjust each voltage to optimum control voltage stated at the LABEL.
  • Page 39: Adjusting X-Sus Pcb

    (Note.1) Factory adjusted optimum voltage is stated in the LABEL above the VIDEO PCB. (refer to FIG<1>) (Note.2) After replacing X-SUS PCB, adjust each voltage to the optimum adjusting voltage as stated in the LABEL (Note.3) Screen Condition : After entering SERVICE MODE, run TEST PATTERN FULL WHITE (refer to 5.
  • Page 40 1) Ramp Up Slope Adjustment Adjusting VOLUME : RY2 (refer to FIG<6-2>, and FIG<2>) Adjusting Method : Adjust VOLUME direction as shown below. 2) Ramp Down Slope Adjustment Adjusting VOLUME : RY10 (refer to FIG<6-2>, and FIG<2>) Adjusting Method : Adjust VOLUME direction as shown below. RY10 3) Vramp_up (Ramp Up voltage) : Ramp Up voltage of Reset Waveform METER used : DIGITAL MULTIMETER (DC Voltage Measure Mode)
  • Page 41: Fig<6-1>X-Sus Pcb Adjusting Points

    FIG<6-1>X-SUS PCB Adjusting Points -41-...
  • Page 42: Fig<6-2>Y-Sus Pcb Adjusting Points

    FIG<6-2>Y-SUS PCB Adjusting Points -42-...
  • Page 43: Software Upgrade Method

    7. SOFTWARE UPGRADE Method 1. Connect the JACK PCB to the Video PCB. 2. Connect 9 PIN serial cable to the computer s serial port. 3. Connect serial cable s opposite end to Jack PCB s RS-232C port. 4. Run PC s Flashupgrader.exe and then push Next(N) > button. 5.
  • Page 44 6. Select as above and push Next(N) > button. Select Comm port and Boud rate and push Next(N) > button. 7. Upgrade process will be displayed. Power the AC on will initiate the download. -44-...
  • Page 45 8. When all files Upgrade are complete, a window(below) will open. Push Finish button to complete the process. -45-...
  • Page 46: Set Disassemble/Assemble Method

    8. SET Disassemble/Assemble Method. 8-1. Facts You Must Know When Disassembling/Assembling PDP SET (1) BACK COVER can be opened without separating the STAND from the PDP SET. (i.e. BACK COVER can be opened without laying the SET) (2) When PDP SET is opened with STAND attached, STAND connecting screws (without the BACK COVER) must be used to stabilize the set.
  • Page 47: Front Mask Disassemble/Assemble Method

    P302~P304, PA603) Detach iron support Unscrew screws (8)CONN-LEFT PCB (refer to FIG<6>, FIG<8>, FIG<11>) Detach STAND from PDP SET Lay PDP SET in a stable place Detach JACK PCB Detach Stand holding iron structures (LEFT & RIGHT) Detach Connecting Connector (PC5~PC7, P304A, PC08A) Unscrew screws (9)CONN-RIGHT PCB (refer to FIG<6>, FIG<8>, FIG<11>)
  • Page 48: Filter Glass Disassemble/Assemble Method

    (Note) Be cautious of FILTER GLASS not being stained with dust or extraneous material. Clean FILTER GLASS with a clean and soft cloth before assembling. 8-3-2. Assembling/Disassembling procedures without STAND attached. (1) Lay the Set on soft and safe place. (2)Detach BACK COVER (3)Unscrew the lower 2 screws of 3 screws located at the TERMINAL PLATE.
  • Page 49: Main Pcb Trouble Diagnosis

    9-1. VIDEO & JACK PCB Trouble Diagnosis 1. Common checking process when No signal or No raster Check start Does No signal 1. confirm Ac connection Is there a weak 2. confirm Power S/W ON screen appear? discharge on the 3.
  • Page 50 COMPOSITE Input : TP Vin check S- VHS input : Check 24th pin of P502(when COLOR BAR PATTERN) If above signal do not appear, JACK PCB has a trouble. (3)TP DECOE Check If DECOE signal do not appear, JACK PCB has a trouble. ( CF : When COMPOSITE NTSC 3.58MHz, check TP COMB.
  • Page 51 If above signal do not appear, JACK PCB has a trouble. (3) TP GHS . GVS . GCLK check If GHS . GVS . GCLK signal do not appear, JACK PCB has a trouble. 4. When PC signal do not appear on screen (1)Input DTV or VIDEO signal and see if DTV or VIDEO signals shown on screen If no signal then check TP DCLKB.
  • Page 52 5. When No Sound Check start 1. Confirm AC connection Does sereen appear? 2. Confirm Power S/W ON 3. Check Video or other PCBs Is the Sound input Jack Check the connection of correctly connected? Jack(PDP or AV device) Is the Speaker correctly Check the connection of connected? Speaker...
  • Page 53 6. When Key does not operate Check start 1. Confirm AC connection Does LED next to Power S/W 2. Confirm Power S/W ON turn on in Red? 3. Check other PCBs 1. Check the connection to Video PCB Does LED turn on in Green? 2.
  • Page 54 7. When Remote Controller does not operate Check start 1. Confirm AC connection Does LED next to Power 2. Confirm Power S/W ON S/W turn on in Red? 3. Check other PCBs Does Remote Controller Check the Battery of operate? Remote Controller 1.
  • Page 55: Digital Pcb Trouble Diagnosis

    9-2. DIGITAL PCB Trouble Diagnosis ( * Check voltage using MULTIMETER(DC voltage measure MODE), Refer to FIG<9-1> for check point position ) 1. Turn Power OFF Turn HIGH VOLTAGE Switch of POWER PCB OFF Turn the Power ON . 2. Check POWER CONNECTOR( P301A ) for 5V, 3.3V input. (1)5V input(1st and 2nd pin from the top) : Normal if 4.8V~5.2V (2)3.3V input(6th and 7th pin from the top) : Normal if 3.2V~3.6V 3.
  • Page 56 (2)DHS (3)DEN -56-...
  • Page 57 (4)DCLK (5)CLK50M -57-...
  • Page 58 (6)M_CLK (7)F_SUBF -58-...
  • Page 59 (8)CLK480 (9)SLCT -59-...
  • Page 60 (10) F_32SFT (11) STILL : Continuously Maintaining 0 V (12) OUT_CLK (13) DEN_OUT : (3) Same as DEN (DELAY form of DEN ) (14) DCLK_OUT : (4) Same as DCLK ( Only phase is different from DCLK ) -60-...
  • Page 61: Fig<9-1>. Digital Pcb Layout

    FIG<9-1 >. DIGITAL PCB LAYOUT ID26 P301A CD1 CD2 5V_6 ID33 CD3 CD4 CD5 CD6 3.3V ID32 3.3V_1 CLK50M CD10 CD11 M_CLK 3.3V_2 2.5V V_MUTE F_SUBF F_32SFT CLK480 STILL SLCT S_RESET DEN_OUT OUT_CLK DCLK_OUT 5V_2 DCLK Y_ERL X_NSHELF Z_IC3 Y_ERH X_HIGH Y_SUSL X_ERL...
  • Page 62: X-Sus Pcb Trouble Diagnosis

    9-3. X-SUS PCB Trouble Diagnosis 1. After disconnect P201A CONNECTOR, turn on the power. 2. If the power turn on normally, check X_SUS PCB. 3. Disconnect P202A Connector. 4. Check remaining voltage of P201A. Current model contains Discharge Resistance for discharging High Voltage (Vsus, Vadd) remaining inside the POWER PCB.
  • Page 63 (Table 1.) Diode Tester Measure Value of PA7 s Each Terminal + : red, - : black NAME DIODE TESTER MEASURE DIODE TESTER MEASURE 173V Open Over 0.7V Over 1.9V Over 0.4V Vadd Open Open (Table 2.) Diode Tester Measure Value of P202A s Each Terminal + : red, - : black Terminal Shape :(Top view, components side) P202A...
  • Page 64 (Table 3.) FET Diode Tester Measure Value + : red, -: black Location NAME DIODE TESTER MEASURE DIODE TESTER MEASURE After about 5 sec, QU19-QU20 Over 0.5V Over 2.2V QU15-QU18 Open Over 0.4V (table 4.) When HIC Diode test, do as the method equal to Y-SUSPCB Check ( refer to 9-4) Note after X_SUS PCB Repair Make sure to check power module s high voltage (Vsus, Vadd).
  • Page 65: Y-Sus & Scan Pcb Trouble Diagnosis

    9-4. Y-SUS PCB Trouble Diagnosis 1. After detach SCAN PCB from Y_SUS PCB, turn on the power. 2. If turn on normally, check SCAN PCB. Detach just SCAN PCB from Y-SUS PCB and perform DIODE TESTER measurement as below. NAME DIODE TESTER MEASURE DIODE TESTER...
  • Page 66 1) Vsus (173V) Voltage CHECK: When keeping above 10 volt, Using not less than 1 K ohm 5 Watt resistance to discharge remaining voltage.(Under 5 volt ) 2) Vadd (68V) Voltage CHECK: When keeping above 10 volt, Using not less than 1 K ohm 5 Watt resistance to discharge remaining voltage.(Under 5 volt ) 7.
  • Page 67 (Table 2.) Diode Tester Measure Value of P102A and P103A’s Each Terminal + : red, - : black Terminal Shape :(Top view, components side) P103A P102A 1 2 3 4 5 6 7 8 9 1011 1 2 3 4 5 6 7 P103A DIODE TESTER DIODE TESTER...
  • Page 68 (table 3.) FET Diode Tester Measure Value + : red, -: black DIODE DIODE Location NAME MEASURE MEASURE TESTER TESTER After about Over 0.4V QY20-QY23 3 sec, OPEN Over 0.4V QY7-QY12 OPEN Over 0.4V QY14-QY19 OPEN Over 0.4V QY13 OPEN Over QY1-0.4V QY1-QY2 OPEN...
  • Page 69 (table 4.) HIC(Hybrid IC) Diode Tester Measure Value + : red, -: black For the HIC inside Y-SUS PCB, PIN number starts from lower right when the PCB is attached to the SET and looked from the front. For the HIC inside X-SUS PCb, PIN number starts from upper left when the PCB is attached to the SET and looked from the front.
  • Page 70 DIODE TESTER DIODE TESTER MEASURE MEASURE After about 15sec, OPEN Over 0.7V 0.5V DLTKD Over 0.4V Over 1.2V Over 0.4V 9~`10 9~`10 Over 1.2V Over 0.5V Over 1.2V Over 0.5V Over 1.2V Over 0.5V Over 1.2V Over 0.5V 21~22 After about 10sec, OPEN 21~22 Over 0.3V 24~25...
  • Page 71: Connection Pcb & Data Cof Trouble Diagnosis

    9-5. CONNECTION PCB & DATA COF Trouble Diagnosis 1. If vertical line is missing or the discharge is other than bar shape on the screen, check CONNECTION and DATA COF. 2. Check CONNECTION and/or DATA COF if following. When P202 is connected, if Vadd and/or 5V is not supplied normally. But, when separated, Vadd and/or 5V is supplied normally.
  • Page 72: Power Pcb Trouble Diagnosis

    9-6. POWER PCB Trouble Diagnosis Although X-SUS / Y-SUS / SCAN / DATA COF are checked, but still the set does not operate, and then check if the following Power PCB s Trouble Symptoms appear. After unplugging X-SUS / Y-SUS PCB s Power Connectors(P101A, P201A) and checking remaining voltage, there still exist several tens of remaining voltage.
  • Page 73: Trouble Shooting

    (2) This TROUBLE SHOOTING list only contains representative and simple PCB trouble diagnosis and Module Exchange method. Therefore, if you find Sets that are difficult to diagnose or to repair, contact Daewoo Electronics. (3)Basic TROUBLE SHOOTING procedure Check Trouble Symptom...
  • Page 74 (Note.1) SCAN PCB is divided into SCANH PCB (drive upper screen) and SCANL PCB (drive lower screen). Each SCAN PCB contains four (64 PIN Output) SCAN DRIVER IC. SCANH PCB drives upper 240 lines out of 480 total lines and SCANL PCB drives lower 240 lines.
  • Page 75 <Symptom.4> POWER SHUT DOWN occur ( refer to Service Manual 10-3 ) (5)Symptoms of DIGITAL PCB Trouble (Note) DIGITAL PCB produces CONTROL SIGNALs for normal operation of Driving BLOCK(X-SUS,Y-SUS,SCAN,DATA). Trouble of this PCB could generate further damage to Driving BLOCK circuit. In other words, if Driving BLOCK CONTROL SIGNALs are abnormal, all kinds of trouble symptoms of PCBs within Driving BLOCK could occur.
  • Page 76 Main PCB Trouble Diagnosis - Possible Symptoms when VIDEO or DIGITAL PCB has a trouble DIGITAL Y-SUS ( Y-CONTROL : P102 P102A, P103 P103A) - Possible Symptoms when Y-SUS PCB or SCAN PCB has a trouble DIGITAL CONN-LEFT ( P304 P304A ) - Possible Symptoms when DATA COF(1st ~ 3rd PAD from left) or CONN- LEFT PCB has a trouble ( refer to Trouble Symptom Picture <2>...
  • Page 77: Trouble Diagnosis And Repairing Method For Representative Symptoms

    10-3. Trouble Diagnosis and Repairing Method for Representative Symptoms (1)When POWER SHUT DOWN occurs <1> Definition of SHUT DOWN - When LED Color is Green, can t hear POWER operating sound. (Red : STAND BY, Green : Operating) - When Turn OFF and turn ON AC SWITCH again, and turn Remote Control POWER ON , POWER RELAY do not operate normally, and POWER operating sound can not be detected.
  • Page 78 images are displayed. <2> PCB Check Priority(Left to Right) - X-SUS, Y-SUS, SCAN, POWER, DATA, DIGITAL, CONN-LEFT/RIGHT <3> Trouble Repairing Procedure - First, refer to 6-2 Adjusting Driving Voltage and Waveform to check if each voltage is adjusted according to Optimum Voltage LABEL . If the there are voltage difference, adjust voltage according to the Optimum Voltage LABEL and then check the screen.
  • Page 79 connection(PS01~PS04). Otherwise check SCANL PCB s connector connection(PS05~PS08 ). Secondly, check if there are no dust, bits of iron, or any other extraneous material between the connectors. Thirdly, reassemble and check if the problem is solved. If the problem still exits, try to replace problematic SCAN PCB.
  • Page 80: Fig<10-1> Trouble Diagnosis Flow When Shut Down Occurs

    AC PWR "OFF" BACK COVER "OPEN" POWER PCB’s HIGH VOLTAGE SWITCH "OFF" (refer to FIG<21>) AC PWR "ON" PWR "ON" with Remote Controller "SHUT DOWN" occur? * LOW VOLTAGE part is N. G. * HIGH VOLTAGE part is N. G. *PCB check priority : *PCB check priority : DIGITAL =>...
  • Page 81: Fig<10-2> Trouble Diagnosis Flow When Low Voltage Shut Down Occurs

    AC PWR "OFF" POWER PCB’s HIGH VOLTAGE SWITCH "OFF" (refer to FIG<21>) Disconnect X-SUS, Y-SUS ’s PWR Connector (P201A, P101A) AC PWR "ON" => PWR "ON" with Remote Controller "SHUT DOWN" occur? Reconnect only X-SUS’s PWR Disconnect DIGITAL’s PWR Connector (P201A) Connector (P301A) AC PWR "ON"...
  • Page 82: Fig<10-3> Trouble Diagnosis Flow When High Voltage Shut Down Occurs

    AC PWR "OFF" POWER PCB’s HIGH VOLTAGE SWITCH "ON" (refer to FIG<21>) Disconnect X-SUS, Y-SUS’s PWR Connector (P201A, P101A) AC PWR "ON" => PWR "ON" with Remote Conrtoller "SHUT DOWN" occur? AC PWR "OFF" POWER PCB is Reconnect only X-SUS’s PWR N.G.
  • Page 83: Fig<10-4> Trouble Diagnosis Flow When Abnormal Discharge Occurs

    AC PWR "OFF => BACK COVER OPEN Y-SUS & SCAN PCB DIODE TEST (refer to 9-4 and FIG<23>) DIODE VOLTAGE Normal? With SCANH/L PCB separated from Replace X-SUS PCB Y-SUS PCB, DIODE TEST for SCANL/H PCB (refer to 9-4, FIG<24> ~ <25>) AC PWR "ON"...
  • Page 84: Assembly List

    PCB ASS Y NAME ASS Y CORD ASS Y DESCRIPTION VIDEO PCB AS PEVDMSD035 PCB VIDEO MANUAL AS JAC PCB AS PEJAMSD035 PCB JACK MANUAL AS DIGITAL PCB AS PEDGMSD035 PCB DIGITAL MANUAL A X-SUS PCB AS PEXSMSD035 PCB X-SUS MANUAL AS Y-SUS PCB AS PEYSMSD035 PCB Y-SUS MANUAL AS...
  • Page 85: Exploded View

    -84-...
  • Page 86: Fig<1> Total

    FIG<1> TOTAL -86-...
  • Page 87: Fig<2> Y-Sus & Scan

    FIG<2> Y-SUS & SCAN -87-...
  • Page 88: Fig <3>. X-Sus

    FIG<3> X-SUS -88-...
  • Page 89: Fig<4> Video & Jack

    FIG<4> VIDEO & JACK -89-...
  • Page 90: Fig<5> Power

    FIG<5> POWER -90-...
  • Page 91: Fig<6> Inlet

    FIG<6> INLET -91-...
  • Page 92: Fig<7> Left-Up

    FIG<7> LEFT-UP -92-...
  • Page 93: Fig<8> Left-Down

    FIG<8> LEFT-DOWN -93-...
  • Page 94: Fig<9> Right-Up

    FIG<9> RIGHT-UP -94-...
  • Page 95: Fig<10> Right-Down

    FIG<10> RIGHT-DOWN -95-...
  • Page 96: Fig<11> Without Jack

    FIG<11> WITHOUT JACK -96-...
  • Page 97: Fig<12> Digital

    FIG<12> DIGITAL -97-...
  • Page 98: Fig<13> Ac Switch Assembly

    FIG<13> AC SWITCH ASSEMBLY -98-...
  • Page 99: Fig <14>. Scan Assembly1

    FIG<14> SCAN-ASSEMBLY 1 -99-...
  • Page 100: Fig <15>. Scan Assembly2

    FIG<15> SCAN-ASSEMBLY 2 -100-...
  • Page 101: Fig<16> X-Sus_Assembly

    FIG<16> X-SUS_ASSEMBLY -101-...
  • Page 102: Fig<17> Front Mask_Assembly

    FIG<17> FRONT MASK_ASSEMBLY -102-...
  • Page 103: Fig<18> Front Mask_Inside

    FIG<18> FRONT MASK_INSIDE -103-...
  • Page 104: Fig<19> Back Cover

    FIG<19> BACK COVER -104-...
  • Page 105: Fig<20> Power Adjusting Points

    FIG<20> POWER ADJUSTING POINTS -105-...
  • Page 106: Fig<21> Power High Voltage Switch

    FIG<21> POWER HIGH VOLTAGE SWITCH -106-...
  • Page 107 FIG<22> HOW TO ADJUST VOLTAGE -107-...
  • Page 108: Fig<23> Y-Sus & Scan Pcb Diode Test

    FIG<23> Y-SUS & SCAN PCB DIODE TEST -108-...
  • Page 109: Fig<24> Scanh Pcb Diode Test

    FIG<24> SCANH PCB DIODE TEST -109-...
  • Page 110: Fig<25> Scanl Pcb Diode Test

    FIG<25> SCANL PCB DIODE TEST -110-...
  • Page 111: Fig<26> 5 Step Gray Scale Pattern

    FIG<26> 5 STEP GRAY SCALE PATTERN -111-...
  • Page 112: Trouble Symptom Picture

    Trouble Symptom Picture<1> -112-...
  • Page 113: Trouble Symptom Picture<2

    Trouble Symptom Picture<2> -113-...
  • Page 114: Trouble Symptom Picture<3

    Trouble Symptom Picture<3> -114-...
  • Page 115: Trouble Symptom Picture<4

    Trouble Symptom Picture<4> -115-...
  • Page 116: Trouble Symptom Picture<5

    Trouble Symptom Picture<5> -116-...
  • Page 117: Trouble Symptom Picture<6

    Trouble Symptom Picture<6> -117-...
  • Page 118: Trouble Symptom Picture<7

    Trouble Symptom Picture<7> -118-...
  • Page 119: Trouble Symptom Picture<8

    Trouble Symptom Picture<8> -119-...
  • Page 120: Trouble Symptom Picture<9

    Trouble Symptom Picture<9> -120-...
  • Page 121: Trouble Symptom Picture<10

    Trouble Symptom Picture<10> -121-...
  • Page 122: Trouble Symptom Picture<11

    Trouble Symptom Picture<11> -122-...
  • Page 123: Trouble Symptom Picture<12

    Trouble Symptom Picture<12> -123-...

This manual is also suitable for:

Dp-42spDp-42wmDp-42smDp-42gpDp-42wp

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