Samsung TX20C53X/XET Service Manual page 68

6. Troubleshooting
6-1 No Power (No Picture on)
No
Check both
terminal voltages of
C807 (280~300V).
Yes
Is Q801 Pin 3
19~22V?
Yes
Check/Replace
T801.
Samsung Electronics
both terminal voltages
of C820 (125V)
No
Check D801~804
F801,Q801.
No
Check IC801
Check
No
Check whether
each power line
is short or open.
No
No
Check/Replace
IC901.
No
Check/Replace
IC902.
Troubleshooting
Yes
Check
Voltage of 5V, 6V, 8V,
13V power line..
Yes
Is IC901
Pin 64 Voltage 5V?
Yes
Check H.V SYNC on
IC901 Pins 1, 2
Yes
Check
IC901 Pin 3 is High
when power is On.
Yes
Check the voltage
of TU001.
6-1