Sony KD-55X8500A Service Manual page 106

#2
F4201,IC4201,F4202,IC4202,F4203,IC4203
( (B* Board) )
Check 12.5V to GND
impedance i d
Low impedance
IC4201,IC4202,IC4203
burn or broken ?
Yes
Replace broken IC
KD-55/65 X8500A/ X8504A
High
enough
Replace broken fuse. p
No
Check broken parts
around broken IC.
If there is no failure, Replace B* board.
#3 #3
IC4201,IC4202,IC4203
(B* Board)
Check the IC4201,IC4202 and IC4203
No
Out pin 9, 16, 25, 32
Switching 0V to 12V
around 300-400kHz around 300 400kHz
Yes
No
Check the CN4802
DC level ~2V
Y Yes
No
Check the IC4201-IC4203
I2S line pin 5, 6, 7, 8
Yes
IC4201-IC4203 NG
TROUBLE SHOOTING
IC or parts around it
NG
L4201-L4208
or
C4234-C4241
NG
IC9000 or around parts NG
106