Bm3J19 Board Lcd Model - Sony KD-55A9G Service Manual

2019/04/19 01:55:00 (GMT+09:00)
1.2 No Power u-com Failure

BM3J19 Board LCD Model

START
Check VDD
C818 Voltage.
Is the voltage >3.0V?
yes
Check TYPE_DET
R810 Voltage.
Is the voltage 2.6±0.2V?
yes
Check OPWRSB
R820 Voltage.
Is the voltage 0V?
yes
Check POWER_ON
R830 or P-on u-com #pin10
Is the voltage >3.0V?
yes
no
Check 3.3V_STBY Line (C805, CN800 #9pin)
no
Type Detection Circuit problem.
Check TYPE_DET Line (R838, R839).
SOC
no
Muffin 3 problem
IC1000 # AL14 OPWRSB
Try AC Off and On after few minutes.
no
If #pin10 keep Low, change IC800.
If #pin10 goes High few seconds and downs to Low,
Check +12V_MAIN Line (from G board).
TV Business Division
Check 12V_MON
no
R822 Voltage.
Is the voltage >2.6V?
yes
Check DC_OFF_DET
no
R824 or
P-on u-com #pin3 (IC800)
is >3.0V?
yes
Check P_ON_#1
no
CL813 or
P-on u-com #pin12 (IC800)
is >3.0V?
yes
Check PGOOD_1
no
R818 Voltage.
Is the voltage >3.0V?
Continue next page...
23
Check 12.7V_MAIN Line
(from G board).
Change IC800
Change IC800
1.3 No POWER - DDCON/LDO
Check 1.0V DDCONs
(IC608, IC609, IC610)
23
SYS SET