RCA 26LA33RQ Service Manual page 18

5,2 Audio Exceptions
5,2.1 No sound (completely)
No sound
Check if there
is audio input
Yes
<_, volume are
Yes
Does CNA1
_ve output signa
No
if the
p13,p14,p37,p38 of
UA1 is ok?
Yes
Check ifp34of
UAI have high
tevel voltage
Yes
Checkifthe plg,
p32 of UA1 have
signal input?
No
No
No
Yes
No
1
Check external equipment
Set the mute and volume 1
Check the TV speakers 1
Audio power supply circuit 1
is bad, change main board
1
Check the MUTB/STB circuit,
if bad, change main board
Yes Check if p1,2 Yes
p35,36 of U20
have output wave
No
Circuit between U8 and CNA1
is bad, change main board
Version 1.0
Circuit between U8 and UA1
is bad, change main board
Change U8
Audio input circuit is bad,
change main board
Change UA1
1
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