Philips 42PFL3704D/F7 Service Manual page 41

[ Audio Signal Section ]
FLOW CHART NO.1
Picture does not appear normally. (EXT. input)
Are the audio(L/R) signals inputted to each pin of
IC401?
IC401 14,15PIN AUDIO(L/R)-IN 1
IC401 16,17PIN AUDIO(L/R)-IN 2
IC401 20,21PIN COMPONENT AUDIO(L/R)-IN
IC401 24,25PIN HDMI AUDIO(L/R)-IN
Are the audio(L/R) signals outputted to Pin(27, 28) of
IC401?
Yes
(Output to audio
output terminal)
Are the audio(L/R) signals outputted to Pin(8, 10) of
CN202?
Check SP801,SP802 and their periphery circuit,
and service it if defective.
Are the audio(L/R) signals outputted to Pin(4, 6) of
CN202?
Yes
Yes
(Output to speakers)
Yes
Yes
Yes
Yes
Yes
Yes
No
Check the line between audio input terminal and
each pin of IC401.
→ JK704, JK705
IC401 14,15PIN
→ JK708, JK709
IC401 16,17PIN
→ JK712, JK713
IC401 20,21PIN
→ JK720, JK721
IC401 24,25PIN
No
Is 5V voltage supplied to the Pin(2, 29, 33, 39, 44) of IC401?
Is 8.2V voltage supplied to the Pin(12) of IC401?
Yes
Replace IC401.
No Replace Digital Main CBA Unit or LCD Module
Assembly.
No
No
Replace Digital Main CBA Unit or LCD Module
No
Assembly.
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
A91H2TR