Philips 40PFL3505D/F7 Service Manual page 34

[ Audio Signal Section ]
FLOW CHART NO.1
Audio is not outputted. (EXT. input)
Are the audio(L/R) signals inputted to each pin of
IC2701?
IC2701 14,15PIN AUDIO(L/R)-IN 1
IC2701 16,17PIN AUDIO(L/R)-IN 2
IC2701 18,19PIN COMPONENT AUDIO(L/R)-IN
IC2701 24,25PIN HDMI AUDIO(L/R)-IN
Are the audio(L/R) signals outputted to Pin(27, 28) of
IC2701?
Yes
(Output to audio
output terminal)
Are the audio(L/R) signals outputted to Pin(26, 28) of
CN2103?
Check SP2801,SP2802 and their periphery circuit,
and service it if defective.
Are the audio(L/R) signals outputted to Pin(4, 6) of
CN2103?
Yes
Yes
(Output to speakers)
Yes
Yes
Yes
Yes
Yes
Yes
No
Check the line between audio input terminal and
each pin of IC2701.
→ JK2704, JK2705
IC2701 14,15PIN
→ JK2708, JK2709
IC2701 16,17PIN
→ JK2710, JK2711
IC2701 18,19PIN
→ JK2720, JK2721
IC2701 24,25PIN
No
Is 5V voltage supplied to the Pin(2, 29, 33, 39, 44) of IC2701?
Is 8V voltage supplied to the Pin(12) of IC2701?
Yes
Replace IC2701.
No
Replace Digital Main CBA Unit.
No
No
No
Replace Digital Main CBA Unit.
No
No
8-6
AUDIO(L/R)-IN 1
AUDIO(L/R)-IN 2
COMPONENT AUDIO(L/R)-IN
HDMI AUDIO(L/R)-IN
No
PL10.5TR