AOC TCL LCD27VN, Service Manual, Page: 20 / 74

27
’’ LCD TV Color Monitor TCL LCD27VN
20
Remote Control Block
Key Board Control Block
Press key no function
Check CN600 Pin6, 7, 8
voltage will change when key
be pressed
Check line between keyboard
and main board or U403
Check U403 and relative circuit
Replace keyboard
NG
NG
OK
Remote Control can
’t work
Check IR Board J1 Pin 1,4(5V)
and voltage at Pin 3 will change
when received signal
Replace D600 or IR board
Check Main board 5V power
relative circuit and signal on
LP602
Check Power relative
circuit
Replace line between Main
board and IR Board or
replace U403
OK
OK
NG
NG