Troubleshooting - Samsung 305TPLUS Service Manual

4 Troubleshooting

Notes:
4-1 No Power (SMPS)
Plug in the Power Cable
3
Aroind 20V at 2pin on
4
Check DSW at ICM801S
Around 380V on CP803
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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
Stand by LED On?
Yes
Yes
Yes
Yes
Replace LCD Panel.
manuals search engine
Check related circuit with IC801S
No
Vcc and Drain-Source Waveform
(DSW)
No
Check the Vcc Circuit from DS803
No
Change ICM801S and check the
related circuit
No
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 Troubleshooting
1
2
4-1