Acer A221HQV Service Manual page 38

ACER A211H/A221HQ
36
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5.2.2 Nothing displays on the screen (Screen is black and colour of LED is blue)continued:
Continue
Check the 5V power are
supplied on CN306 pin 1, 2, 3, (to
the LCD panel module)
OK
Check the CN306 all LVDS signals.
OK
Failure Point
1) The LVDS cable broke between
CN306 and LCD panel module.
2) LCD panel module is failure.
5. Troubleshooting (continued)
Check if the Voltage on I303
NG
pin S that is DC power at 5V.
OK
Check if the MOS FET Gate level
on I303 pin G, that Gate level is low.
OK
Failure Point
I303 is failure.
Failure Point
NG 1) Printed wire broke between CN306
and I310 LVDS signals.
2) I310 is failure.
Failure Point
NG (1) Printed wire broke between
CN301 pin 9, 10,11 and I303 pin 2.
(2) L301 is open.
Check the PANEL
NG VCC_EN signal of the Q301 pin 1
(with R309) at high level.
OK
Failure Point
1) Printed wire broke between Q301
pin 1 and I310 pin 64.
2) R309 is open.
3) I310 is failure.
Failure Point
1) Printed wire broke between Q301
pin 3, R305, R307, C312 and I303
pin G.
2) Q301 is failure.
NG