- 22 -
[ Flow chart 2 ] Symptom: power not on
Trouble description: test after machine power on, standby indicator light is not on and +12V power
outputted by power adapter is abnormal.
Y
Y
Y
Y
N
Power not on
Check
whether power
board Cn2
has 12V voltage
Check
whether 12v
resistor to ground
is normal
Check whether filtering
capacitor TC3/TC4 has
electric leakage and
short-circuit
Check
whether power
board TC1 has 310v
voltage
Check fuse, TC1 and
rectifying bridge
Check
whether each pin
voltage of U1 is
normal
N
Check according to
troubleshooting process
for“player not switch on”
Check
whether Q1 is
damaged
Y
Check
whether VD4
has secondary
voltage
Y
Check
whether VD4
secondary voltage is
normal
Y
Check
whether voltage
of TC2 two ends
is normal
Y
N
N
N
Check NCP1207 and
peripheral elements
Change Q1
Check feedback loop
U2/U3
Change L3
END
N
Y
N
N
Check
whether transformer
is normal
Change transformer
N
Check VD4
Содержание LD2006K
Страница 1: ...Service Manual LD2006K RU ...
Страница 62: ...5 1 2 Bottom layer of Main Board 21901 2 4941424 59 ...
Страница 63: ...5 1 3 TOP layer of Power Board 52006 5UL 5449928 5 1 4 Bottom layer of Power Board 52006 5UL 5449928 60 ...
Страница 85: ...5 2 6 DVD KEY Board 82 1 2 SW601 1 2 SW602 1 2 SW603 1 2 3 CN601 CN 3P2 0 1 2 D601 1N4148 D602 1N4148 SW2 SW1 ...