MA IN UNIT REPAIR CHART 1/ 3
A
A ll function
No workin g
Check all sy stem
a ll cable is l oos e
or bad IN T
Pa nel stanby LE D
sh ow work in g or No t
Re -i nsert and fi x
the cabl e
Check back power
PC
B
F 901 bad cause da ma ge
Change F 901
Check CN905 2pin
BK 5V if righ t
Check repair control
PC B Standb y circui t
Check +5V power
supply circui t
Check RB 901 1pin
+5 V= 5V
Check repair switch
po wer ci rcuit ( See B)
Check all Voltage
3.3V and 1.8V
give circuit
V CC=5V
VD 33= 3.3V
VD 18= 1.8V
Check IC208 Pin234 OS C
frequenc y 27M Hz
Repair ma in pcb betw een
IC 202 IC 206 IC 208and IC 602
circui t
YE S
NO
NO
BA D
NO
OK
YE S
WORK
NO
CHECK
CORRECT
YE S
YE S
B
Power Supply
No workin g
A ll Vo lta ge
No Ou tput
Check F 901
Ba d Cause Damage
Check BK 5V +5V
Wo rking or No t
No
YE S
No
+ 35.5V Voltage
No Ou tput
Check Repair IC 901 IC 902
A nd It s co nn circui t
- 27V Voltage
No Ou tput
+ 12V Voltage
No Ou tput
+5 V Vo lta ge
No Ou tput
Check Q901 Q909 IC 901
A nd It s Co nj oi nt Part
Check Q912 IC 902
A nd It s Co nj oi nt Part
Check Q912 IC 902
A nd It s Co nj oi nt Part
Check Q912 IC 902
A nd It s Co nj oi nt Part
No
C
A ll Functio n
No S ound
Check PO WE R IC
Vo lta ge + 35.5V
Ye s
See Contents B
CheckQ306 D304 ZD303
A nd It s co nn part s
Ye s
No
Check Q305 C
Vo lta ge 3.3V
OK
No
A
A ll F unctio n
No Wo rkin g
B
Po wer Su
pply
No Wo rkin g
C
A ll F unctio n
No So und
D
Ip od inpu t
No So und
E
A udi o line IN
No Ou tput
F
Wi reless
No Ou tput
G
DVD A udi o
No So und
H
MP 3 In
No So und
I
CO AX IA L In
No So und
L
T uner No So und
M
No Sv ideo Output
O
HD MI No Ou tput
BK 5V Voltage
No Ou tput
Check Q912 IC 902
A nd It s Co nj oi nt Part
CheckQ501 Q502 IC 505
A nd It s co nn part s
OK
LO W
CheckQ902 ZD905 IC 505
A nd It s co nn part s
Check Q902 C
Vo lta ge 3.3V
OK
No
Check IC 505 51P IN
HIGH( 3.3V ) OR LO W( 0V )
Check IC 501 IC 502 IC 503 IC 504
A nd It s Co nj oi nt Part
P
No CVBS Ou tput
Q
No Y Pr Pb ou tput
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