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LG Electronics L1733TR, L1933TR service manual Trouble In Dpm, Waveforms

Models: L1733TR L1933TR

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4. TROUBLE IN DPM

TROUBLE IN DPM

CHECKNO

R442, R443

	YES


CHECK		NO
U201 PIN 27,28		NO


SYNC PULSE ?

	YES


TROUBLE IN U201

CHECK PC

PC IS NOT GOING INTO DPM OFF MODE

CHECK H/V SYNC LINE

Waveforms

3	R442 H-Sync

R443 V-Sync

Copyright 2007 LG Electronics. Inc. All right reserved.	LGE Internal Use Only
Only for training and service purposes	- 21 -
Only for training and service purposes

Page 21

Image 21

LG Electronics L1733TR, L1933TR service manual Trouble In Dpm, Waveforms

Contents

Same model for Service READ THE SAFETY PRECAUTIONS IN THIS MANUALCHASSIS NO. LM57B BEFORE SERVICING THE UNITSPECIFICATIONS CONTENTSWARNING FOR THE SAFETY-RELATEDCOMPONENT PRECAUTIONmarked on the schematic diagram and the Leakage Current Hot Check CircuitSERVICING PRECAUTIONS General Servicing PrecautionsElectrostatically Sensitive ES Devices Replacement IC Remove/ReplacementSmall-SignalDiscrete Transistor Removal/ReplacementCircuit Board Foil Repair At IC ConnectionsAt Other Connections TIMING CHART VIDEOSYNC Only for training and service purposes DISASSEMBLY-SetSoft pad on the table Pull up the stand partRemove the screws Only for training and service purposes1.Pull the front cover upward 3.Put the front face downIn case of Latch #1-1 DISASSEMBLY-StandDISASSEMBLY-Stand In case of Latch #1Only for training and service purposes Hold the stand bodyLIPS BLOCK DIAGRAMMStarACE Line BufferBLOCK DIAGRAM-POWER POWERINVERTER 2.Power Part DESCRIPTION OF BLOCK DIAGRAM1.Video Controller Part 3.MICOM Part6.Signal collection LIPS Board Block DiagramPRIMARY Operation description LIPSADJUSTMENT Figure 1. Cable Connection SERVICE OSDTROUBLESHOOTING GUIDE 1. NO POWERWaveforms 2. NO RASTER OSD IS NOT DISPLAYED - LIPS Waveforms 3. NO RASTER OSD IS NOT DISPLAYED - MSTARWaveforms 4. TROUBLE IN DPM5. POWER 6. Raster Only for training and service purposes WIRING DIAGRAMLGE Internal Use Only 6631900109AEXPLODED VIEW Only for training and service purposesLGE Internal Use Only EXPLODED VIEW PARTS LIST Ref. NoDescription SAFETY Mark REPLACEMENT PARTS LISTOnly for training and service purposes CAUTION: BEFORE REPLACING ANY OF THESE COMPONENTSLGE Internal Use Only Only for training and service purposesFILTERs TRANSISTORLGE Internal Use Only Only for training and service purposesCAPACITORS TRANSISTORs & ICsOnly for training and service purposes LGE Internal Use OnlyTRANSFORMER 1. SCALER SCHEMATIC DIAGRAMOnly for training and service purposes LGE Internal Use Only2. POWER & WAFER Only for training and service purposesLGE Internal Use Only 3. INVERTER Only for training and service purposesLGE Internal Use Only 4. POWER Only for training and service purposesLGE Internal Use Only P/NO MFL43002807 Feb