Display Troubleshooting (Blank Screen Or Show Nothing) - Hisense LHD32D33EU Service Manual

5.3.3. Display Troubleshooting (blank screen or show nothing)

N
Check if UD1 Pin 1 is 5V
N
Check if external power
supply is ok ?
N
Check UL2
power circuit
N
Change IC
chip of UL2
Indicator light on?
Check if power supply is ok
(such as 5V,1.0V,1.5V,3.3V)
Y
Check if UL2 have 3.3V
output
Y
Check if U5 FLASH have
upgrade or upgrade to death
Y
Upgrade or
change FLASH
Y
Y
N
Check if Y1 or
Check unmoral power
FLASH is OK?
supply module
Change FLASH
Check if R66 exist 560-600
MHZ clock
N
Check if R42 is OK
N
N
or Y1
Change main chip
U1
Y
Y
Change R42