TCL LCD32E9A-MS91 AP Service Manual page 27

Y
check 3 control
voltages(power-
on/off,panel-on/off,on-
pback,) if OK,
N
check
relevant
circuitry
check working conditions of U300 if OK
I2C BUS
wokring if
OK
U301/U302/U305 power
supply and SCL/SDA
No Working
LED if Lighting
Y
Power supply if
OK
Fig1. No Working
N
check 5vstb voltage
if OK
N
Check the relevant
circuitry,e.g.power
supply B.D
crystal/Reset
circuitry working if
OK