FUNAI LH8-M40BB - Other Voltage and Key Operation Troubleshooting

8-3 A03P0TR
AL+5V is not output.
FLOW CHART NO.9
Is approximately 5
V voltage supp
lied to the cathode
of D523?
Check if there is any leak or short-circuit on the
loaded circuit, and service it if defective.
Yes
Check D523, D524, C515
and their pe
riphery cir
cuit,
and service it if def
ective
.
No
P-ON+9V is not output.
FLOW CHART NO.11
Yes
No
Is approximately 1
3V voltage supp
lied to the
collector o
f Q517?
Is approximately 10V voltage supplied to the
base of Q517?
No
Yes
Replace Q517.
Replace Q510.
P-ON+3.3V is not output.
FLOW CHART NO.10
Is approximately
5V voltage supp
lied to the co
llector
of Q510?
Yes
Check D523, D524, C515 and their per
iphery cir
cuit,
and service it if de
fec
tive.
Check D539, C522 and their per
iphery cir
cuit, and
service it if def
ective
.
Check Q508, Q520, D541, D
542, P-ON-H2 line an
d
their per
iphery cir
cuit, and ser
vice it if def
ective
.
No
Is approximately 3.4V voltage supplied to the base
of Q510?
Yes
Check Q508, Q5
11, D526, P-ON-H2 l
ine and thei
r
peripher
y circuit, and ser
vice it if de
fec
tive.
No
When pre
ssing each s
witches (SW101B, SW103B-
SW107B) do the v
oltage of Pin(11) on C
N403
increase
?
Yes
No
FLOW CHART NO.12
Are the cont
act point and installation
state of the ke
y
switches (SW101B
, SW103B-SW107B) normal?
Re-install the switches (SW101B, SW103B-SW107B)
correctly or replace the poor switch.
No
Check the switches (SW101B, SW103B-SW107B)
and their periphery, and service it if defective.
Yes
Replace Digital Main CBA Unit.
The key operation is not functioning.