LG LM-K3960A Service Manual page 18

I SMPS POWER CIRCUIT
*MAIN PART
Check the fuse F901
YES
Check the DC V of C905.
If DC V is over 400V
YES
Chcek the DC V Of C909,
C903,C921 If DC V is in
14~19V and it is steady.
YES
Check the DC V Of
C981,C945. If DC V is 6.1V
YES
Chcek the DC VOf
C950,C951 If DC V is in
35V,-35V
YES
OK
NO
Replace the fuse
NO
Check BD901, LF901,902
NO
Check IC901 ,902
YES
Check short of P9701,P9702
line
NO
Check short of P9702 line
NO
Check short of P9701 line
- 2-11 -
NO
Replace IC 901,902