4 Troubleshooting
4-1
4 Troubleshooting 4-1 No Power (SMPS)
Stand by LED On?
Check related circuit with IC801S
Vcc and Drain-Source Waveform
(DSW)
Plug in the Power Cable
Yes
No
Aroind 20V at 2pin on Check the Vcc Circuit from DS803
Yes
No
Check DSW at ICM801S
Change ICM801S and check the
related circuit
No
Yes
Around 380V on CP803
Check the related circuit whit ICP 801S
and QP801S
No
Yes 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
Replace LCD Panel.
1
2
3
4
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