Sony GN1G - Page 34

34
TROUBLE SHOOTING
3-2-2. NO Power (U-Com Failure)
KDL-50W800C, 805C, 807C, 809C/KDL-55W800C, 805C
START
Check R9346 Voltage.
Is the voltage >3.0V?
Check OPWRSB
R9355 Voltage.
Is the voltage 0V?
Check DC_OFF_DET
SOC Muffin problem
No
Yes
No
Yes
Check P_ON_LNB
P-on ucom #pin15
Is the voltage >3.0V?
Change IC9027
No
Yes
Check MAIN_VCC
R9354 Voltage.
Is the voltage >1.6V?
G*Board/ LD-Board
No
Yes
Check P_ON_VBUS
P-on ucom #pin11
is >3.0V?
Change IC9027
No
Yes
Yes
Change IC9027
No
Check P_ON_#1
P-on ucom #pin13
is >3.0V?
Check PGOOD_1
R9360 Voltage.
Is the voltage >3.0V?
No POWER - DDCON/LDO
->Check 1.0V DDCON
No
Check C9237 Voltage.
Is the voltage >3.0V?
No POWER - DDCON/LDO
->Check 3.3V DDCON
No
Check POWER_ON
P-on ucom #pin19
Is the voltage >3.0V?
G*Board/ LD-Board
No
Yes
A
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Size B* Board G* Board H* Board
50” BMX Not applicable
HSC3
55” BMX Not applicable
HSC3