Skyworth 42E68 - Service Flow Charts; No audio & No backlight

Y
Y
Y
Y
Y
Y
Y
Y
N
N
N
N
N
N
N
N
Y
Y
Y
N
N
N
N
Y
N
No audio & No backli
g
ht
Led indicator “red” on
Check the 5VSTB on “CN2”
Press the “ON/OFF” on keyboard &
remote control
,
led turns
g
reen
Check the AC input on
p
ower su
pp
l
y
board
Upgrade the software
Change the
AC line
Check the
fuse on power
supply board
Done
Change
the fuse
Change the
power supply
b
oard
Done Done
Upgrade the
software
Check the 5V, 12V
on power supply board
Change the
power supply
b
oard
Check the
“ON/OFF” voltage
on “CN2”, should
be greater than 2.7V
Change
the panel.
Done
Done
Done
Change the FLASH U100
Done
Done
Check all DC power
supply on U10110
Chang the power
supply IC for U101
Change the
Main IC “U101
”
Change the
Main
b
oard
Done
Done
Done
Service Flow Chart
-48-
Y
Y
Y
N
N
N
Check “Q28” &
“U101” Pin B10&B12
if
it works well.
Upgrade the
software
Change the
“
Q
3” or “U11”
Change the“U101”
Done
Done
Done
Upgrade the
software
Done