TCL L55S4610F

32
Don’t start
Is Power board 3.3V
STB, 12V/24V normal?
Check if every DC-DC
Shift module has
output. Does main IC have
power supply or not
Check power
board
Check every
DC-DC module
Check if main chip
Output Pow-ON, Dim,
BL-ON Signal to
power board
Check the U401(main IC)
Peripheral components
/ upgrade main software /
check whether it connect
ground well /
Check UART LOG
Main IC reset signal
IIC bus signal
Crystal work or not
Replace U401/U702
No
Only3.3V
Yes
YES
No
Yes
Yes
No
Trouble Shooting