No Sound (Th-42Px600U) - Panasonic TH-37PX60U Technical Manual

No Sound (TH-42PX600U)

<Symptom>
No Audio
<Models>
50inch (HD Panel), 42/37inch (HD/SD Panel)
<How to determine the defective board>
Is there a sound
No
waveform at pin 13
and 14 of IC2307
located on the PA
board?
Yes
Is there a
waveform at pin No
1 of connector
PA1 (R-Ch) or
PA2 (L-CH)
Yes
Check the speakers.
This page is purposely left blank.
Are the
connectors
No
H1/DG1 and
PA20/DG20
properly
seated?
Replace
No
Is sound
the PA
restored?
board.
Yes
Problem solved
Change the DG board.
Reseat the
connectors
H1/DG1 and
PA20/DG20.
Is pin 16 of
No
IC2300 of
Change the PA board
the PA board
high?
Yes
Is the base
No
of Q2313 of
Replace the H board.
the PA board
high?
Warning: Disconnect AC Power prior to
Yes
making any disconnection or
33
34
connection.