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LG DT-7000 Service Manual
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LG DT-7000 Service Manual

LG DT-7000 Service Manual

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LG
DT-7000
MODEL
SERVICE MANUAL

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Summary of Contents for LG DT-7000

  • Page 1 DT-7000 MODEL SERVICE MANUAL...
  • Page 2 NO TELETEXT Check the voltage of ZD701 (5V) Abnormal Normal Check the 5V line Check if the video signal is Check the to be correct. at pin 10 of IC702. CVBS line. Check I C BUS lines. (SDA, SCL) Check/Replace Check pin 51, 52, 53 and 54 IC702, 703, X701.

  • Page 3: Digital Block

    NO PICTURE/NO COLOR Is the CVBS signal at pin 14 Check/Replace of IC101 normal? IC101. Is the CVBS signal at pin 26 Check/Replace of IC501 normal? Q201. Is the R-Y, B-Y signal at pin 3, 4 Check/Replace of IC501 normal? IC501, 502.
  • Page 4 NO SOUND (PICTURE OK) (NO AM Sound) (NO FM/NICAM Sound) Check the Audio signal Check if the SIF signal at pin26 of at pin27 of IC101. IC101 normal. Check/Replace Check/Replace IC101. IC101 Check the Audio signal Are the Audio signal at pin28 and at pin55 of IC601.

  • Page 5: No Picture/No Sound

    NO PICTURE/NO SOUND (RASTER OK) Is the Auto programme operation normal? Is the CVBS signal at pin14 Check the voltages of IC101 normal? 5V, 12V and 33V of Tuner. Check/Replace Check/Replace ZD101, 102, IC101. 5V, 12V and 33V Lines. Go to NO PICTURE Block. Check I C bus lines.
  • Page 6 NO RASTER NO SOUND Check +B voltage at J306. 140V Is there the square waveform at Is the voltage at pin 24 pin4 of P101 (H-out) of IC01 5V? Check/Replace IC803, Check the part of D826, 827, 828, 829, T805, Digital PCB ASSY T801, 804 and Fuse (FC02).
  • Page 7 Digital assy Trouble shooting Check with Color Bar signal input. Screen flows No Picture or Check ICQ501. screen flows no good Check Y,U,V signal No Picture Replace ICQ06 Check Pin10 of ICQ06 input of PQ101. Check Y,U,V good signals at CQ54(+),CQ57(+) and CQ58(+).

  • Page 8: Main Board

    Preparation for VCO Adjustment Connect the measuring equipment to the TV as shown in Fig. 1. 2. Set RF output level of sweep S.G.(Signal Generator) to 80dBuV. 3. Set Alignment Scope, Volts/Div to 100mV, AC/DC switch to AC, Line/Ext switch to Ext. MAIN BOARD Ceramic CAP.
  • Page 9 MAIN BOARD Ceramic CAP. 10000pF 33.9MHz Multimeter & IC101 Signal oscilloscope TDA4474 generator 2.5Vdc Z102 VR102 G3953 Ceramic CAP. C123(+) GND(C122(-)) 10000pF C25(+) J139 12Vdc Power Supply AM/FM SW GND(C26(-)) C25(-) R169 R124 L/L'SW Fig. 2 : Connecting Diagram of Equipments for secam-L' system. b) For Secam-L' system Test Poin t : J5 (one lead of R533)
  • Page 10 * RF AGC (Auto Gain Control) A djustment Test Poin t : J173 or Observing Display Adjus t : VR101 MAIN BOARD AGC TP. VR101 J173 (AGC ADJ.) 6Vdc Digital Multimeter Fig. 5 The RF AGC contro l (VR101) was aligned at the time of manufacture for optimum performance over a wide range conditions.

  • Page 11: 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 12 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 13 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 14 SPEAKER1(L) IIC1 TUNER L/S AMP EEPROM EEPROM 128K TUKE9CO7DF GL4558 LA4282 24C16 27C010A SPEAKER2(R) IIC1 Addr & Data SOUND PROCESSOR H/P AMP MSP3410P TDA2882 TDA4474A Headphone u-PROCESSOR IIC0 CVBS IIC1 SDA30C163-2 RESET Addr & Data AUDIO SW. 1H DELAY MEGA TEXT 1M DRAM Lo/Ro2 LA7222...