TCL LCD32E9A-MS91 AP Service Manual page 29

AV input if have picture
N
check P302 if assemble
regular
Y
check Q805 Vcc-panel
power supply and
relevant if regular
Y
Check P803's Pin16
BL_ON if high level,
over 3V is regular.
N
check Q801 and U300's
working conditions if
regular.
Y
Replace U300
No Picture
Y
Test waveform of
Pin54/55 of U300 if
have regular signal
Y
Replace
U300
Fig3. No Picutre
input
N
check waveform of
pin1/2 of U600 if
regular
Y
check
waveform
of Z600's
Pin8 if
regular
N
replace Tuner Z600
N
Replace
U600