Troubleshooting - Samsung TI21B4DF4X Service Manual

5. Troubleshooting

5-1 No Power (No Picture on)
No
Check both
terminal voltages of
C805 (280~300V).
Yes
Is IC801S Pin 3
19~22V?
Yes
Check/Replace
T801S
Samsung Electronics
both terminal voltages
of C813 (125V)
No
Check D801S~804S
FD801S
No
Check IC801S
/Zener diode
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 A5V,A3.3V,
A15V power line.
Yes
Is IC201S
Pin 54 Voltage 3.3V?
Yes
Check
H.V SYNC on
IC201S Pins 33, 21, 22
Yes
Check
IC201S Pin 11 is High
when power is On.
Yes
Check the voltage
of TU001.
5-1