DAEWOO ELECTRONICS DTT-3250, Service Manual, Page: 9 / 33

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5. TROUBLE-SHOOTING
◆
First of all, check the short test of D402,D403 and D408
If short D402, change D402 and if short D403 or D408, repalce them with I301
Other cases, follow this sheet.
1. No Raster
Stand-By LED Check
Check R824
DC 3.3V
Check
Q802, Q803, I809
Check I802
Check #4 of I801
Check #1 of I801
(Switching)
Check #1 of I801
(DC 300V)
Check D801~D804
And D805~D806
Check/Replace F801
Check
Stand-By Circuit
Power On
check with
Remote controller Check
Remote controller
And IR Circuit
Check/Replace Q802~Q803,
DP142 And peripheral parts
Replace I802
or Check/Replace D808
Check/Replace
R804, T801
Check
secondary
voltage
(Output voltage
of T801)
Next
page
Replace
I801
Replace
this parts
Check
power cord
End
Abnormal
Normal
*
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