Troubleshooting - Samsung CSM2077DVX Service Manual

5. Troubleshooting

5-1 No Power (No Picture on)
No
Check both
terminal voltages of
C806 (280~300V).
Yes
Is IC801S Pin 3
19~22V?
Yes
Check/Replace
DZ801,DZ804,
DZ802,PC801S
Samsung Electronics
Check
both terminal voltages
of C815 (130V)
No
Check D801S
FB801S
No
Check IC801S
No
Voltage of 8V, 12V, 6V,
20V power line..
Check whether
each power line
is short or open.
No
Output Voltage 5V?
No
Check/Replace
Q901, ZD901, D901
Q811-B Pin 20 is High
No
when power is On
Check/Replace
IC902
Check /Replace
Q810, Q812, DZ805
Troubleshooting
Yes
Check
Yes
Is Q808-E
Yes
Is Q901-E
Voltage 3.3V?
(in UMI Board)
Yes
Check
(about 0.6~2.0v)
Yes
5-1