LG Electronics L1933TR, L1733TR service manual No Raster Osd Is Not Displayed - Mstar, Waveforms

Page 20

3. NO RASTER (OSD IS NOT DISPLAYED) – MSTAR

NO RASTER
(OSD IS NOT DISPLAYED)



U201		NO
PIN 16, 75		NO


3.3V?

	YES

U201

PIN96, 97NO OSCILLATE AS

14.31MHZ?

YES

U201

PIN27 IS 48KHz H-SYNC?

CHECK U301

1.CHECK C210, C211 SOLDERING CONDITION

2.CHECK X201

3.TROUBLE IN U201

CHECK CONNECTION

PIN28 IS 60Hz V-SYNC?

IS PULSE APPEARED

AT SIGNAL PINS?

AT MODE 12?

YES

TROUBLE IN CABLE

OR LCD MODULE

LINE FROM D-SUB TO U201

Waveforms

1	U201-#96, 97

U201-#27 H-SYNC

U201-#28 V-SYNC

Copyright 2007 LG Electronics. Inc. All right reserved.	LGE Internal Use Only
Only for training and service purposes	- 20 -
Only for training and service purposes

Image 20

Contents READ THE SAFETY PRECAUTIONS IN THIS MANUAL Same model for ServiceCHASSIS NO. LM57B BEFORE SERVICING THE UNITCONTENTS SPECIFICATIONSPRECAUTION WARNING FOR THE SAFETY-RELATEDCOMPONENTmarked on the schematic diagram and the Leakage Current Hot Check CircuitElectrostatically Sensitive ES Devices SERVICING PRECAUTIONSGeneral Servicing Precautions IC Remove/Replacement ReplacementSmall-SignalDiscrete Transistor Removal/ReplacementAt Other Connections Circuit Board Foil RepairAt IC Connections SYNC TIMING CHARTVIDEO DISASSEMBLY-Set Only for training and service purposesSoft pad on the table Pull up the stand partOnly for training and service purposes Remove the screws1.Pull the front cover upward 3.Put the front face downDISASSEMBLY-Stand In case of Latch #1-1In case of Latch #1 DISASSEMBLY-StandOnly for training and service purposes Hold the stand bodyBLOCK DIAGRAM LIPSMStarACE Line BufferINVERTER BLOCK DIAGRAM-POWERPOWER DESCRIPTION OF BLOCK DIAGRAM 2.Power Part1.Video Controller Part 3.MICOM PartLIPS Board Block Diagram 6.Signal collectionPRIMARY Operation description LIPSADJUSTMENT SERVICE OSD Figure 1. Cable ConnectionWaveforms TROUBLESHOOTING GUIDE1. NO POWER 2. NO RASTER OSD IS NOT DISPLAYED - LIPS 3. NO RASTER OSD IS NOT DISPLAYED - MSTAR Waveforms4. TROUBLE IN DPM Waveforms5. POWER 6. Raster WIRING DIAGRAM Only for training and service purposesLGE Internal Use Only 6631900109ALGE Internal Use Only EXPLODED VIEWOnly for training and service purposes Description EXPLODED VIEW PARTS LISTRef. No REPLACEMENT PARTS LIST SAFETY MarkOnly for training and service purposes CAUTION: BEFORE REPLACING ANY OF THESE COMPONENTSOnly for training and service purposes LGE Internal Use OnlyFILTERs TRANSISTOROnly for training and service purposes LGE Internal Use OnlyCAPACITORS TRANSISTORs & ICsTRANSFORMER Only for training and service purposesLGE Internal Use Only SCHEMATIC DIAGRAM 1. SCALEROnly for training and service purposes LGE Internal Use OnlyLGE Internal Use Only 2. POWER & WAFEROnly for training and service purposes LGE Internal Use Only 3. INVERTEROnly for training and service purposes LGE Internal Use Only 4. POWEROnly for training and service purposes Feb P/NO MFL43002807

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