Stihl BT 131 - Power Supply Trouble (LED Not Bright); Power Supply Trouble (LED Bright)

VIDEOCON INDUSTRIES LTD. V59-CTYPE
The information in the specification is subject to change without notice
20
. BOARD SERVICE MANUAL
1). Power supply Trouble (LED no bright)
2). Power supply Trouble (LED is bright)
Check LED & line
Check 5VSTB
OK
Check 12VSTB
NG
Check N507 & peripheral circuit
OK
NG
OK
Check +B (380V)
Repair the circuit
Check F701, RT701,D701∽D704
Or N701 & peripheral Circuit
NG
NG
Check N709，N703 & peripheral circuit
supply
.
Check X701 & Power Input
circuit
OK
OK
OK
Check the power supply circuit
(See: Power supply Trouble (LED no bright) )
NG
NG
Check 5VSTB
Check Q504 for 5V
Check N506 for 1.8V to DDR
Check N504 & 1.25VSTB Pins of N401
C
heck
N
507
&
3.3VSTB
Pins
of
N401
Check N110 for 1.25VSTB
Check N121 for
3.3V
STB
Check Q504 for 5V& 5V peripheral Circuit
Check N506 for +1.8V & 1.8V circuit of N401
NG
See: Display Trouble
OK