RCA 50LB45RQ

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
p1,2,3,34,35,36 of
UA1 s ok?
Yes
Check ifp19of
UA1 have high
level voltage
Yes
Checkifthe p15,20
21,22 of UA1 have
signalinput?
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 if F Yes
of Ual have PWAsi
_utput
No
Circuit between Ual and CAN1
is bad, change main board
Version 1.0
Circuit between U8and UA1
is bad, change main board
Change U8
Audio input circuit is bad,
change main board
,4
Change UA1
1
16