No Output - Samsung MAX-670 Service Manual

6-1-3 No Output

Main PCB OC2,OC8
(STK4221), pin no.11,13
; B+,B circuits
AQ OC2,OC8 pin no.7 ;
B- (-0.3V)
OQ4,OQ2
Base B+ ?
Is Mute selected ?
Headphone jack
Short ?
Front PCB
µ-com pin no.5 ;
Check the "H"
Samsung Electronics
O
X
O
O
X
O
X
O
X
O
X
X
Check the B+ power
source part in PBD2(GBU6D),
PC1 and PC2.
Check the mute
circuit OQ1(KSR2003)
base B+ (0V)
O
Replace OQ1
Confirm for TR short
Replace it
Remove it with Remocon
Replace Headphone jack
soldering condition
Replace µ-com
Check if the output line is
short
Troubleshooting
X
Replace OD8
6-3