Power Check - LG LM-M540 Service Manual

POWER CHECK

Every kinds of Fuse check
C901(+), C902(-) DC power output check
C903(+) DC power output check
IC901, IC902 power output check
IC903 power output check (12V)
CN513 7PIN 5V check (at CD Function)
normal operation
Fuse replace
CN901 1, 5 AC voltage output check
D901 replacement
CN901, 9, 10 pin DC power output check
D902, D903, D904, D905 (1SR35)
check and replacement
IC901, IC902 check and replacement
IC301 78PIN 5V check
IC904 replacement
Q904(A1273) Base Low check
Q904, CD Ass'y check replacement
- 2-3 -
Power supply Ass'y check
and transformer replacent
Power supply Ass'y check
and transformer replacent
IC301 5V Power output
PN302/CN302 13 PIN check
Check
IC501(BU2090) 14PIN HIGH check
IC5019BU2090 check & replace
Q905 Base HIGH(C103M)
Check and replace defective