LG 710B Service Manual
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LG 710B Service Manual

Color monitor
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Summary of Contents for LG 710B

  • Page 1 L,AL**SL 73NM 73NM...
  • Page 2 0.92...

  • Page 3: Safety Precautions

    SAFETY PRECAUTIONS SAFETY-RELATED COMPONENT WARNING! X-RADIATION There are special components used in this color monitor The only potential source of X-radiation is the picture tube. which are important for safety. These parts are marked However, when the high voltage circuitry is operating on the schematic diagram and the replacement properly there is no possibility of an X-radiation problem.

  • Page 4: Servicing Precautions

    SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this 9. Use with this receiver only the test fixtures specified in this service manual. service manual and its supplements and addenda, read and follow the SAFETY PRECAUTIONS on page 3 of this CAUTION: Do not connect the test fixture ground strap publication.
  • Page 5 General Soldering Guidelines Replacement 1. Use a grounded-tip, low-wattage soldering iron and 1. Carefully insert the replacement IC in the circuit board. appropriate tip size and shape that will maintain tip 2. Carefully bend each IC lead against the circuit foil pad and solder it.
  • Page 6 Circuit Board Foil Repair At Other Connections Excessive heat applied to the copper foil of any printed Use the following technique to repair the defective copper circuit board will weaken the adhesive that bonds the foil pattern at connections other than IC Pins. This technique to the circuit board causing the foil to separate from or involves the installation of a jumper wire on the "lift-off"...

  • Page 7: Timing Chart

    TIMING CHART VIDEO SYNC << Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >> Sync Total Period Video Active Sync Duration Front Porch Blanking Time Back Porch Resolution Mode Frequency Time (B) Polarity Sort –...
  • Page 8 DISASSEMBLY 1. Carefully place the monitor on a soft cushion 4. Separate the back cover from the latch at the and stand it upright with the cabinet facing bottom of the cabinet using the jig as shown in downward. the figure. 2.
  • Page 9 ADJUSTMENT 1. Preparation for Service Adjustment 2. Adjustment by Service Hot key How to enter SVC HOT KEY GENERAL INFORMATION 1. Press Menu and OSD window will appear. 2. While OSD window is displayed, is seen on the All adjustment are thoroughly checked and corrected left bottom of OSD window.
  • Page 10 4. Distortion 10. Parallelogram Scanning frequency : All Mode (Mode 1~4) Display image : Crosshatch pattern Horizontal : 10 Row Vertical : 8 Row 11. Adjustment of white balance (Adjustment of chromaticity diagram) *(Adjustment of white balance must be made after entering Hot Key Mode and DEGAUSS.) 2.0mm, 2.0mm...
  • Page 12 3. Adjustment Using Service software Program 2. Adjustment for White Balance and Luminance. (Adjustment Program) 1) Set the White Balance Meter. 2) Press the DEGAUSSING on the OSD menu for 1. Adjustment for Factory Mode (Preset Mode). demagnetization of the CDT. 3) Display color 0,0 pattern at Mode 4.

  • Page 15: Wiring Diagram

    WIRING DIAGRAM P501(option) P701 S + S P702 P402 Socket P902 Signal Cable P302 P301 - 15 -...

  • Page 16: Block Diagram

    BLOCK DIAGRAM...
  • Page 24 6. NO DEGAUSSING NO DEGAUSSING CHECK TROUBLE IN IC401 PIN 4 (5V)? IC401 (MICOM) CHECK TROUBLE IN Q953 COLLECTOR D953 VOLTAGE (0.5V)? CHECK TROUBLE IN P902? P902 TROUBLE IN CHECK RL901 RL901? TROUBLE IN TH901, DEGAUSSING COIL - 24 -...
  • Page 26 5. TROUBLE IN H-LINEARITY UNBALANCED OF H-LIN. CHECK TROUBLE IN IC401 IC401 (MICOM) PIN 11, 12, 13 ? CHECK TROUBLE IN Q711~Q716? Q711 ~ Q716 CHECK TROUBLE IN L703? L703 Cs SIGNAL TABLE HORIZONTAL FREQUENCY(fH) 30K ~ 33.9K TROUBLE IN 34K ~ 38.9K C722, C723, C726, C729 39K ~ 43.9K...
  • Page 32 21. User Control Failure Check connector Ass’y. IC401 Pins 27 and 28 Check and replace function key. inputs are right at each function? Check and replace IC401. Done. 22. Missing Color Proper Video levels are Check signal generator and on P301 Pin 1, 3 and 5. signal cable.
  • Page 33 23. Visible Retrace Check white balance adjustment. G2 voltage is right? Check G2 control volume and FBT. Blank pedestal is on Check IC302 Pin 19, 20 and 21 of IC302 and related components. Check Q799 Is V_FLB and DC_bias on and related components.
  • Page 34 25. Misconvergence Degauss the CDT Adjust Pole4,Pole6 Done to improve the misconvergence Change CRT and readjust convergence. Done. 26. Poor Focus Adjust focus VR. Aging monitor and Improved focus? check for focus change. Check focus leads from FBT to CRT Socket. Check the CRT Socket.
  • Page 35 - 35 -...
  • Page 36 710BL BRAND C083A HF-350 NON-MPR2 BK,Brazil model 3091TKC099X 710BL BRAND C083A HF-350 NON-MPR2 ,Brazil model 6318L17026A CDT(CIRC),M41LFQ803X00NDDU LG-PHILIPS DISPLAYS 70KHZ 29.1MM FST TCO PLUS BARE 6318L17026B CDT(CIRC),M41LFQ803X00NDDV LG-PHILIPS DISPLAYS 70KHZ 29.1MM FST MPR PLUS BARE 6318L17026C CDT(CIRC),M41LFQ503X00NDDV LG-PHILIPS DISPLAYS 70KHZ 29.1MM FST GLARE PLUS BARE 6318L17026D CDT(CIRC),M41LFQ803X00SDDU LG-PHILIPS DISPLAYS 70KHZ 29.1MM FST PLUS TCO BARE...
  • Page 37 REPLACEMENT PARTS LIST CAUTION : BEFORE REPLACING ANY OF THESE COMPONENTS, READ CAREFULLY THESAFETY PRECAUTIONS IN THIS MANUAL. * NOTE SAFETY Mark ! ALTERNATIVE PARTS 710BM DATE: 2005-8-18 DATE: 2005-8-18 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION CAPACITORS C419 0CQ2221N419...
  • Page 38 DATE: 2005-8-18 DATE: 2005-8-18 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION D316 0DRTW00119A 1N4005-1021 TIWAN SEMI TP DO41 C902 0CBZTBU002C BULK PCX2 335 104M 600V 1A 30A 2USSEC 5.0UA C903 0CKZTBU003D SC SAMWHA 250V 1000PF M BULK D401 0DSGF00019A 1N4148 GULF TP DO35 100V 0.15A...
  • Page 39 DATE: 2005-8-18 DATE: 2005-8-18 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION RADIAL D951 0DRGF00150A UF5404 GULF BK DO201AD 400V 6210TCE003J BAS2550T BO SUNG 2550MM 3.0A 150A 50NSSEC 10.0UA FB308 AXIAL52MM D952 0DSGF00019A 1N4148 GULF TP DO35 100V 0.15A 6210TCE003J BAS2550T BO SUNG 2550MM...
  • Page 40 DATE: 2005-8-18 DATE: 2005-8-18 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION R438 0RD1303Q609 130K 1/4W(3 5% TA52 R203 0RD2200Q609 220 OHM 1/4 W(3.4) 5.00% TA52 R439 0RN4700F409 470 OHM 1/6 W 1.00% TA52 R204 0RD4300Q609 430 OHM 1/4 W(3.4) 5.00% TA52 R440 0RN1001F409...
  • Page 41 DATE: 2005-8-18 DATE: 2005-8-18 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION 17""" R768 0RD4703A609 470K OHM 1/2 W(7.0) 5.00% TA52 T702 6170TCZ012B "EE1916 1.6MH FOCUS R771 0RD3001Q609 3K 1/4W(3 5% TA52 TRANS,700BJ"...
  • Page 42 - 42 -...
  • Page 43 L1130MM,WITH EARTH T730BHPM UL 20276-9C(4.9MM) AT 1500MM GRAY(85964) T710BM GM 773NM KLRUMLT BRAND CA-136 773NM KLEUELT BRAND CA-136 773NM KLCNMLT BRAND CA-136 A83A 773NM KLRUMLT BRAND CA-136 TOTAL A83B 773NM KLEUELT BRAND CA-136 TOTAL A83C 773NM KLCNMLT BRAND CA-136 TOTAL...
  • Page 44 REPLACEMENT PARTS LIST CAUTION : BEFORE REPLACING ANY OF THESE COMPONENTS, READ CAREFULLY THESAFETY PRECAUTIONS IN THIS MANUAL. * NOTE SAFETY Mark ! ALTERNATIVE PARTS 773NM DATE: 2005-8-19 DATE: 2005-8-19 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION CAPACITORS C420 0CQ6831N509...
  • Page 45 DATE: 2005-8-19 DATE: 2005-8-19 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION D315 0DSPT00019A PSS244 PCTRONIX TP DO34 280V ELECTRONI(SHENZHEN)" 625MA 1000MA 50NSSEC 10UA C902 0CZZTFB001C "MPX104K2YL ETR 275V 0.1UF D316 0DRTW00119A 1N4005-1021 TIWAN SEMI TP DO41 10%,-10% BULK X2"...
  • Page 46 DATE: 2005-8-19 DATE: 2005-8-19 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION FB309 6210TCE003J BAS2550T BO SUNG 2550MM 30A 50NSEC 10UA AXIAL52MM D942 0DR400409AC UF4004 GULF TP DO41 400V 1A FB310 6210TCE003A BRD3510B BO SUNG 3510MM 30A 50NSEC 10UA RADIAL...
  • Page 47 DATE: 2005-8-19 DATE: 2005-8-19 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION R420 0RD2001Q609 2K 1/4W(3 5% TA52 60V 0.2A R421 0RD1501Q609 1.50K 1/4W(3 5% TA52 Q799 0TRKE90019A MPSA92 KEC TP TO92 -300V R422 0RD2001Q609 2K 1/4W(3 5% TA52 500MA...
  • Page 48 DATE: 2005-8-19 DATE: 2005-8-19 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION OTHERs R737 0RN0560H609 0.56 1/2W 5 TA52 R738 0RN0560H609 0.56 1/2W 5 TA52 430-858C AFC-520 BAE EUN TA R739 0RD2701Q609 2.70K 1/4W(3 5% TA52 430-858C AFC-520 BAE EUN TA...
  • Page 49 773NM...
  • Page 51 Sep 2005 P/NO : 38289S0002E Printed in China...

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