Samsung LHU30BS, 305TPLUS service manual Troubleshooting, No Power Smps

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4 Troubleshooting

4 Troubleshooting

Notes: 1. Before troubleshooting, setup the PC ’ s display as below.

Resolution: 2560 x 1600

H-frequency: 98.7 kHz

V-frequency: 60 Hz

2.If no picture appears, make sure the power cord is correctly connected.

3.Check the following circuits.

No raster appears: Function PBA, Main PBA, Inverter, Panel

5V develop but no screen: Main PBA

+24V, +18V does not develop: SMPS, Main PBA

4-1 No Power (SMPS)

Plug in the Power Cable

Stand by LED On?

Yes

No

No

Check related circuit with IC801S 1 Vcc and Drain-Source Waveform (DSW) 2

3Aroind 20V at 2pin on

Yes

Check the Vcc Circuit from DS803

4Check DSW at ICM801S

Yes

Around 380V on CP803

Yes

Replace LCD Panel.

No

No

Change ICM801S and check the

related circuit

Check the related circuit whit ICP 801S

and QP801S

Check 24V output related circuit with

zener diode (DZM854)

Check IC 8008 DC/DC convertor for

5.4V output

Check ICM853(379Roo) for 18V output

4-1

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Contents LCD-Monitor Page Required Equipment DDC Edid Data InputHidden Key list Edid Installation with Dos Program After Replacing the Main Board Edid Installation with Windows ProgramMemo Block Diagram Main Block Diagram Smps Block discription Main Circuit DescriptionsBlock Description Name Micom Block discription Smps Block Description Name Disassembly Disassembly and ReassemblyDescription Picture Description Description Picture Description Reassembly Electrical Parts List Level Loc. No Code No 2007-000070 2007-000075 C120 LS17VDP Others Assy MICOM-SPZ,W/WLS30HUB*,W/W CIS Exploded View and Parts List 1. LS30HUXCB/XSF Parts List Component & Function Product FeaturesDVI Installation InstructionsPCB Diagram PCB Diagram Smps Safety Precautions PrecautionsStatic Electricity Precautions Servicing PrecautionsInstallation Precautions Memo Spec Comparison Fashion FeatureSpecifications LHU30BS305T Plus Spec Comparison to the Old ModelsCODE.NO Option SpecificationTechnical Terms Reference InfomationDot Pitch Connecting Your Monitor Sync 24P DVI-D Type Pin No Pin AssignmentsTiming Chart Horizontal Frequency Dellzpd PVA ZPD Panel Description14-8 14-9 14-10 14-11 14-12 No Power Smps TroubleshootingWaveforms No Power Main No Video Digital Waveforms Memo Wiring Diagram Wiring Diagram Smps PCB Schematic Diagrams Connection Diagrams Micom Diagrams Power inverter Schematic Diagrams Waveforms Smps Schematic Diagrams Smps Schematic Diagrams Waveforms
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