User`s manual

4-2-3 STB POWER Solution process
No input of +5VSB,or output is unmoral
Test point：CN903 PIN2
Voltage：5V（4.9－5.1）
Test AC Input of CN901 ok
or not?
Voltage：AC 100 V ~ 120 V
/200 V ~ 240 V
Test voltage of C905
is DC300V or not？
Check FUSE F901,
BD901ok or not？
Check IC901 and D901
ok or not？
+5VSB OK
No input of AC Power
out, or output is unmoral
Test point：CN902
Voltage: AC INPUT±1V
NG
NG
OK
OK
OK
NG
NG
PS－ON ok or not？
Test point：CN903 PIN4
Voltage：DC5V（High）
Vccp ok？
Test pads of C909
Voltage：DC13V－25V
Q901, Q902, Q903, Q904,
M902 ok or not？
AC POWER-OUT OK
OK
OK
OK
Check circuit of
IMAGE BOARD,
and check PS-ON
OK or not?
Do these process
under the state is
+5VSB
POWER un-moral
Note：Must distinguish connect Grand point of Power primary and secondary level.
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