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LG DI-28Z12 Service Manual
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LG DI-28Z12 Service Manual

LG DI-28Z12 Service Manual

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LG
DI-28Z12
MODEL
SERVICE MANUAL

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Summary of Contents for LG DI-28Z12

  • Page 1 DI-28Z12 MODEL SERVICE MANUAL...
  • Page 2 ADJUSTMENT Y Safety Precautions 1. It is safe to adjust after using insulating transformer Test Point : J189 or Observing Display between the power supply line and chassis input to Adjust : VR101 prevent the risk of electric shock and protect the instrument.
  • Page 3 : Deflection Data Adjustment SC (Vertical “S” Correction) Adjust so that all distance between each horizontal lines are to be the same. NOTE: To enter SVC mode, press "SVC" button on the Remote control or "OK" button on both TV set and the Remote EW (Horizontal Width) control.
  • Page 4 : Screen Voltage Adjustment Table 2 : Deflection initial data 50Hz DATA 60Hz DATA Test Point : RK (Red Cathod of CPT Board) Item 16:9 16:9 Adjust : Screen Control of FBT ZOOM 1/2 ZOOM 1/2 1) Turn the TV set to receive digital pattern. (Under the condition of ARC Mode 16:9 (Wide Mode)) 2) Press PSM button on remote controller.

  • Page 5: Purity And Convergence Adjustment

    PURITY & CONVERGENCE ADJUSTMENT Caution: 5. Reconnect the internal degaussing coil. Convergence and Purity have been factory aligned. Do not attempt to tamper with these alignments. 6. Position the beam bender locking rings at the 9 o'clock However, the effects of adjacent receiver components, or position and the other three pairs of tabs (2,4 and 6 pole replacement of picture tube or deflection yoke may require the magnets) at the 12 o'clock position.
  • Page 6 1.ADJUST YOKE Z-AXIS FIRST 2 .ADJUST BEAM BENDER 2 POLE TO GET EQUAL BLUE MAGNET TO GET FOUR EQUAL COLOR CIRCLES COLOR CIRCLES MAGNETS 8. Referring to above, perform the following two steps: 6. Reconnect the internal degaussing coil and apply AC power. a.
  • Page 7 ROTATION DIRECTION RING MOVEMENT OF RED OF BOTH TABS PAIRS AND BLUE BEAMS OPPOSITE POLE SAME OPPOSITE POLE SAME UP/DOWN ROCKING OF THE YOKE LEFT/RIGHT ROCKING OF THE YOKE UP/DOWN ROCKING OF THE YOKE LEET/RIGHT ROCKING OF THE YOKE CAUSES OPPOSITE ROTATION OF RED CAUSES OPPOSITE SIZE CHANGE OF THE CAUSES OPPOSITE ROTATION OF RED CAUSES OPPOSITE SIZE CHANGE OF...

  • Page 8: Exploded View

    EXPLODED VIEW - 1 -...

  • Page 9: Exploded View Parts List

    The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. LOCA. NO PART NO DESCRIPTIONS 341-919C HOLDER,D-COIL 6341V28001A BARE CPT ASSY,W66QBD590X 0.4GGAUS 6400VF5001C SPEAKER,MID-RANGE 8 OHM 5/12W 120-C76F SPEAKER,TWEETER 8OHM 10/20 150-201L COIL,DEGAUSSING 6150Z-5031F DY DW28SLNO1...
  • Page 10 A/V2 TUNER(FS) FRONT A/V,S-VIDEO IC1601 SOUND AMP LA4282 IC101, VIF/SIF IH DELAY TDA9815 TDA4665 CVBS(RF) R.G.B. CVBS(A/V1) SCART1 TDA4566 CPT/VM ASSY TDA8376 R.G.B. VIDEO SHARNESS CHROMA CVBS VIDEO S/W AN5342K DEFLECTION TEA6415 R.G.B. R.G.B. VIDEO AMP H-BLANKING TEA6108 R.G.B. MC14538BCP CVBS(MONITOR) SKY-OUT GM71C4256...

  • Page 11: Troubleshooting Guide

    Troubleshooting Guide DEAD SET (NO RASTER, NO SOUND) Check the waveform at the pin46, 48 (SDA, SCL) of IC01 4.5Vp-p Check the voltage at the pin8, 37 Check the voltage at the pin6 of IC01 of IC501 during main power SW(SW801) on High(5V) Check the voltage at (+) lead of Check/Replace...
  • Page 12 NO SOUND (PICTURE OK) * A2 Stereo Check the voltage at the (+) lead of * FM Mono C822 Check the voltage at the pin10 of Check/Replace FR852, D815 IC1601 Check the waveform at the pin1, 7 Check/Replace F1601 of IC1603 Abnormal Normal Check the waveform at the pin21,...
  • Page 13 NO RASTER (SOUND OK) Check heater element is lighting Check the heater Voltage 6.0-6.6Vrms Check/Replace FR901 Increase screen voltage of FBT Good Check the B+ (110V) Check/Replace CPT Screen is black Retrace line is visible at C422 110V Check the waveform Check the Contrast &...
  • Page 14 NO TELETEXT Check the voltage at the pin41 of IC01 Below 0.5V Check the waveform at the pin6 of Check/Replace SCART pin16 IC701 Normal Abnormal Check the waveform at the pin10 Check/Replace X701 of IC701 Normal Check the waveform at the pin10, Check/Replace Q206 11, 15 (I C BUS) of IC703...
  • Page 15 NO PICTURE/NO SOUND (RASTER OK) Check the 33V at Tuner Normal Check/Replace FR848, D311, Check the waveform at the emitter R829, R830, ZD812 of Q205 Normal Abnormal Check the voltage at Check/Adjust the pin29 of IC102 VIF/SIF Check/Replace Check 5V Power line IC102/Tuner NO SKY SOUND NO SKY PICTURE...

  • Page 16: Replacement Parts List

    The components identified by mark critical for safety. REPLACEMENT PARTS LIST Replace only with part number specified. LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION D1712 0DD247109AA DIODE,1S2471 D1713 0DD247109AA DIODE,1S2471 IC01 0ISO864611A IC,CXP864P61S-1(OTP) 52,SDIP BK M D1714 0DD247109AA DIODE,1S2471 IC02...
  • Page 17 The components identified by mark critical for safety. Replace only with part number specified. LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION ZD02 0DZ560009AA DIODE,ZENER MTZ5.6B Q2908 0TR322709AA TR,KTC3227-Y,TP(KTC1627A),KEC ZD02K 0DZ620009AA DIODE,ZENER MTZ6.2B Q2909 0TR968000AA TR,KTA968A-Y KEC ZD03 0DZ560009AA DIODE,ZENER MTZ5.6B Q2910...
  • Page 18 The components identified by mark critical for safety. Replace only with part number specified. LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION C04K 0CN3910K519 C,TUBULA(HIGH DIELE) 390P 50V K C1609 0CE106DH618 C,ELECTROLYTIC 10UF STD 25V M C05K 0CN4710K519 C,TUBULA(HIGH DIELE) 470PF 50V C1610 0CQ5621N509...
  • Page 19 The components identified by mark critical for safety. Replace only with part number specified. LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION C258 0CE476DF618 C,ELECTROLYTIC 47UF STD 16V M C431 0CE108DJ618 C,ELECTROLYTIC 1000UF STD 35V M 0CE227DJ618 C,ELECTROLYTIC 220UF STD 35V M C432 0CE108DH618...
  • Page 20 The components identified by mark critical for safety. Replace only with part number specified. LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION C547 0CQ3921N409 C,POLYESTER(MYLAR) 0.0039U 100V J C644 0CX2700K409 C,TUBULA(T.C) 27PF 50V J C548 0CC2210K415 C,CERAMIC(TEMP COMP) 220P 50V J C645 0CN1030F679 C,TUBULA(HIGH DIELE) 0.01MF 16V M...

  • Page 21: Ferrite Core

    The components identified by mark critical for safety. Replace only with part number specified. LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION C814 181-091C C,DE0705 R 471K 1KV Z702 125-123A CORE,FERRITE BFD3565R2F C816 181-091C C,DE0705 R 471K 1KV JACK C817 181-001A...
  • Page 22 The components identified by mark critical for safety. Replace only with part number specified. LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION L714 0LA0681K119 INDUCTOR 6.8UH K R05K 0RD0102F609 R,CARBON FILM 1/6W 5 L715 0LA0102K119 INDUCTOR 10UH K 0RD3301F609 R,CARBON FILM 3.3K...
  • Page 23 The components identified by mark critical for safety. Replace only with part number specified. LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION R1608 0RD3301F609 R,CARBON FILM 3.3K 1/6W 5 R248 0RD0681F609 R,CARBON FILM 6.8 1/6W 5 R1609 0RD6200F609 R,CARBON FILM 620 1/6W 5 R249...
  • Page 24 The components identified by mark critical for safety. Replace only with part number specified. LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION R316 0RD4701F609 R,CARBON FILM 4.7K 1/6W 5 R451 0RD6801F609 R,CARBON FILM 6.8K 1/6W 5 0RD2001F609 R,CARBON FILM 2.0K 1/6W 5 R452...
  • Page 25 The components identified by mark critical for safety. Replace only with part number specified. LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION R546 0RD5601F609 R,CARBON FILM 5.6K 1/6W 5 R633 0RD3901F609 R,CARBON FILM 3.9K 1/6W 5 R547 0RD1201F609 R,CARBON FILM 1.2K 1/6W 5...

  • Page 26: Spark Gap

    1/6W 5 ACCESSORIES R976 0RD2003H609 R,CARBON FILM 200K 1/2W 5 VR101 180-F03J R,SEMI-FIX(H) EVN-DJAA03 B203 3828VA0172B MANUAL,OWNERS PD8TA,LG EN 026A TX 6710V00026A REMOTE CONTROLLER PD-8TA DIGITAL SPARK GAP SK901 6918VRA001A SPARK GAP,RADIAL DSP-301N-C04F 300V SK902 6918VRA001A SPARK GAP,RADIAL DSP-301N-C04F 300V SK903...
  • Page 27 Service Sheet of PD-8TA P/N : 3854VA0048A-S2(1/2) DATE : 98.12.04 Video (CVBS) Audio Chroma(RGB) Y(Luminance) Waveform...
  • Page 28 Service Sheet of PD-8TA P/N : 3854VA0048A-S1(1/2) DATE : 98.12.04...
  • Page 29 Power & Deflection...
  • Page 30 Audio KEY & AV2...
  • Page 31 Power-IN Scart OUT...
  • Page 32 Main...

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