Philips MCD139B/12 - Repair Instructions; Main Unit Repair Chart

2-1 2-1
REPAIR INSTRUCTION
ABCDEF
All Function No
Work ing
All Function No
Sound
Audio Li ne Out
No Ouput
Coaxial Out No
Sound
Aux In No Sound Tuner Function
No Sound
A
All Function No
Work ing
Check all system all cable
is loose or bad INT
RE-insert and fix
the cable
YES
Panel stand LED whether
light
NO
Check SW power
+5V out
NOT Bad
Check IC9 and
conjoint part
Din cable is loose
or bad INT
OK
RE-insert and fix
the cable
YES
Check CN3 and
control board
NO
Check Q7 Q8 out + .5V
+3.3V whether correct
YES
Check MA IN PCB IC9
IC IC 3 IC 5
NO
Correct
Check Repair Q3 2 Q7
Q8 and conjoint part
B
All Function No
Sound
Check RB5 Pin
whether at +24V
NO
Check SW power IC9
and conjoint part
Check Q5 PinC
whether at 5V
NO
Check IC5 and conjoint
part
Check IC5 IC5 2
IC5 3 IC5 4 IC 5 5
YES
YES
C
Audio Li ne Out
No Ouput
DVD Function SPK
whether output
NO
Check IC 3
Check Q2 Q23 PinB
whether at .7V
YES
YES
Check Q 9 and conjoint
part
Check IC2 and conjoint
part
NO
D
Coaxial Out No
Sound
Check IC8 Pin 4 whether
at 5V
NO
Check FB47
Check IC8 and conjoint
part
YES
E
Aux In No Sound
Check U3 Pin 9 Pin24
whether at 3.3V
NO
Check FB9
Check U3 and conjoint
part
YES
F
Tuner Function
No Sound
Check U3 Pin 9 Pin24
whether at 3.3V
NO
Check FB9
Check CN3 Pin5
whether at 2V
YES
NO
Check T3 and conjoint
part
Check IC3 and TUNER
YES
MAIN UNIT REPAIR CHART