5.Troubleshooting (continued)
5.2Nothing displays on the screen (Screen is black and colour of LED is blue)continued
ACER X193HQ |
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Go to cover page
Continue
Check the 5V power supply for
P305 pin 1,2,3.
NG
Check the I301 pin2 if voltage is 3.3V
OK
Check the I309 pin2 if voltage is 1.8V
NG
NG
Proceed "Checking the DC/DC converter
circuit" section.
Proceed "Checking the DC/DC converter
circuit" section.
OK
OK
Check the I307 pin2 if voltage is 5V
OK
Failure Point
NG
1) FB312 is open.
2) C353, C355 is short.
Check if the voltage
between I307 pin2 and
pin3 is above
NG
OK
Failure Point
I307 is failure.
Check the input voltage level whether was changed when pressed function keys on the P304 pin 5 (normal is high level, when push buttom, generated 2.2V/1.9V/0.7V)
NG
Check if the Q311 pin2 of |
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PANEL Power_ON/OFF |
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signal that outputted by I305 |
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| 1) | Printer wire between R411 | ||||
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pin10 is High level. |
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| and I305 pin10 is failure | |||
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| 2) | I305 is failure. |
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| 3) | R413,C366 is short |
| OK |
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Failure Point
1)Printed wire between R311 pin3, R410, R412, I307 pin1 is failure..
2)Q311 is failure.
Check if the voltage on I305 pin 20 that is
from 3.3V to 0.7V.
OK
Check the P305 all LVDS signals.
NG
OK
Failure Point
1)The LVDS cable broke between P305 and LCD module.
2)LCD module is failure.
NG
OK
Failure Point
I305 is failure
Failure Point
1)Printed wire broke between P305 and I305 LVDS signals.
2)I305 is failure.
Failure Point
1)Printed wire broke between P304 pin 5 and I305 pin 20.