JBL SB 350 (serv.man4) Service Manual ▷ View online
Remote
control does
not work
go
Check whether battery
of remote control is
exhausted
Check whether have
+3.3V_STB and IR signal
on CON201
No
Yes
Replace battery
Yes
Replace EQ board
Check LDO U455 circuit
and IR_IN connection
on main board
No
REMOTE CONTROL DOES NOT WORK
NO AUDIO OUTPUT
NO AUDIO
OUTPUT
go
Check whether have
PVCC on main board
PVCC on main board
Check whether
U253(CS42528) output
signal
Yes
No
Check whether have
19V
Yes
Replace TPA3118
Check whether have
SCLK, LRCK,DATA from
U251(CS48L11)
No
Replace power
board
Replace U451
No
Yes
Replace
U253(CS42528)
Yes
Check the voltage of
U251 or replace it
No
AUX IN DOES NOT WORK
AUX IN DOES
NOT WORK
go
Check whether have
+5V_A on pin8 of
U350,U351
Check whether there is
signal on pin5 of
U350,U351
Yes
No
Check whether main
board or J352 cable
well connection
No
Replace J351
Check whether there is
signal on pin1 of
U350,U351
Yes
Yes
Replace U350,U351
No
OPTICAL IN DOES NOT WORK
OPTICAL IN
DOES NOT
WORK
go
Check whether have
3V3_STB on pin1 of
J350
Check whether there is
signal on pin3 of J350
Yes
No
Check whether main
board or J352 cable
well connection
No
Replace J350
Yes
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