TCL L32F3300 - Troubleshooting: Key and IR Issues; Remote Control Functionality Troubleshooting; Keypad Functionality Troubleshooting

Key and IR
Check if the P901 PIN2 value
is variational When you press
the different key button?
Keyboard issue
Y
N
Check if R338,L919,
R921,R922,C933 and
cable is right
N
Failure point
Y
U500 issue
.H\QR
IXQFWLRQ
Check if the P900 PIN2 have
the RC waveform
Check IR BOARD and RC
Y
N
Check if the IR
net(L920,L926) and cable is
right
N
Failure point
Y
U500 issue
5&QR
IXQFWLRQ
P100 PIN1 is 3.3V
Y
N
Y
Y
P901 PIN1 is 3.3V
Y
N