Flow - Sony A1E Series Service Manual

FLOW

1-1. NO POWER
No Power
Check STBY 3.3V
NG
C409
Between G* Board to
near CN401
on BKA board
OK
BKA Board
XBR-55/65/77A1E
NG
Replace
G* Board
BKA board Harness
OK
Harness
u-Com Failure
DDCON/LDO
Main Device Failure
1-2. NO POWER U-COM FAILURE
START
Check VDD
no
C506 Voltage.
Is the voltage >3.0V?
yes
Check TYPE_DET
no
CL403 Voltage.
Is the voltage 3.3±0.2V?
yes
Check OPWRSB
no
R443 Voltage.
Is the voltage 0V?
yes
Check POWER_ON
no
R526 or P-on ucom #pin10
Is the voltage >3.0V?
yes
Continue next page...
TROUBLE SHOOTING
Check +3.3V_STBY Line (C521, CN401 #7pin)
Type Detection Circuit problem.
Check TYPE_DET Line (R445).
SOC
Muffin 2
problem
Try AC Off and On after few minutes.
If #pin10 keep Low, change IC401.
If #pin10 goes High few seconds and downs to Low,
Check +12V_MAIN Line (G board ).
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