Acer A221HQV - Page 39

5. Troubleshooting (continued)
5.2.3 Checking the back light unit:
OK
NG
Failure Point
1) The wire between Power +22V and
Inverter +22V is broken.
2) Power board failure.
OK
NG
Failure Point
1) Printed wire broke between CN301
pin 13, and I310 pin 114.
2) R301 is open.
3) I310 is failure.
Failure Point
Back light unit of LCD module is failure.
Is +22V supplied to inverter PWB?
(by the power board)
Check the BACKLIGHT_ADJ
signal of the CN301 pin 13 from I310
pin 114 is a PWM signal.
37
Go to contents page
ACER A211H/A221HQ