Acer A221HQV Service Manual page 50

ACER A211H/A221HQ
48
Go to contents page
5.3.2 Nothing displays on the screen (Screen is black and colour of LED is blue)continued:
Continue
Check the 5V power are
supplied on CN304 pin 1, 2, 3, 4, 5
(to the LCD panel module)
OK
Check the CN304 all LVDS signals.
OK
Failure Point
1) The LVDS cable broke between
CN304 and LCD panel module.
2) LCD panel module is failure.
5. Troubleshooting (continued)
Check if the Voltage on I302
NG
pin S that is DC power at 5V.
OK
Check if the MOS FET Gate level
on I302 pin G, that Gate level is low.
OK
Failure Point
I302 is failure.
Failure Point
NG 1) Printed wire broke between CN304
and I306 LVDS signals.
2) I306 is failure.
Failure Point
NG
Printed wire broke between CN301
pin 9, 10,11 and I301 pin S.
Check the PANEL
NG VCC_EN signal of the Q303 pin 1
(with R309) at high level.
OK
Failure Point
1) Printed wire broke between Q303
pin 1 and I306 pin 29.
2) I306 is failure.
Failure Point
1) Printed wire broke between Q303
pin 3, R305, R307, C309 and I302
pin G.
2) Q303 is failure.
NG