Read Sony KD-55X8500A (serv.man2) Service Manual online
KD-55X8500A/65X8500A(CH)
106
TROUBLE SHOOTING
Check 12.5V to GND
impedance
F4201,IC4201,F4202,IC4202,F4203,IC4203
(B* Board)
Replace broken fuse.
High
enough
Low impedance
IC4201,IC4202,IC4203
burn or broken ?
Replace broken IC
Yes
Check broken parts
around broken IC.
#2
IC4201,IC4202,IC4203
(B* Board)
#3
Check the IC4201,IC4202 and IC4203
Out pin 9, 16, 25, 32
Switching 0V to 12V
around 300-400kHz
No
Yes
Check the CN4802
DC level ~2V
No
L4201-L4208
or
C4234-C4241
NG
Yes
IC4201-IC4203 NG
Check the IC4201-IC4203
I2S line pin 5, 6, 7, 8
IC9000 or around parts NG
No
Yes
No
If there is no failure, Replace B* board.
IC or parts around it
NG
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