Repair Instructions - Philips HTS3121/12 Service Manual

REPAIR INSTRUCTIONS

All functions
are not working
Check all cables of
system are loose or bad
insert
Standby led of panel
whether is light
Check IC505 of main board
and their conjoint parts
MP3 In has
no sound
check MP3 music output is ok
check mp3 jack connect is ok
check mp3 jack cable and
CN508 connect of mian pcb
is ok
check pin4 and pin11 of IC501
on the top of main pcb whether
have music input
check IC510 of main pcb is OK
2 - 1
All functions
All functions
are not working have no sound
Re-insert and fix
the cable
check output of
BK3V3 on the top
of power board
Keep CN508 of main board has
Music input
check from CN503 to IC510
conjoint parts
coaxial /optical
Aux In has MP3 In has
input has no sound
no sound
no sound
All functions
have no sound
check pin29 and pin9 of
Check switch power and
CN501(on the top of main
the conjoint parts
pcb) whether are +30.4V
and +12V
check pin1of C609 (on
check IC501 of main pcb
the top of main pcb) and their conjoint parts
whether is +3.3V whether are ok
check IC507, IC508 of
MAIN PCB and their
conjoint parts whether
are OK
coaxial /optical
input has no sound
check C526 is ok
check their conjoint parts of
check pin1 of C650 is 3.3V,
JK501 and JK303
check C540 is ok
check pin3 and pin 22 of IC509
(on the top of main pcb) output
check their conjoints part of L501
whether are all 3.3V
check IC509 of main pcb
and their conjoint parts
2 - 1
Aux In has
no sound
check pin8 of IC504(on the
check pin1 and pin7 of
top of main pcb) output
IC504(on the top of main
whether is +12V and their
pcb) output whether are ok
conjoint parts whether are OK
check pin5 and pin13 of
check IC501 and FB508
IC506(on the top of main
of main pcb whether are
pcb)output whether are 5V
OK
and 3.3V
check IC506 of main pcb
and their conjoint parts
whether are OK