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5. Troubleshooting (continued)
5.2 Nothing displays on the screen (Screen is black and colour of LED is blue)continued
Continue
Check the 5V power supplyfor
P305 pin 1,2,3.
OK
Check the I301 pin2 if
voltage is 3.3V
OK
Failure Point
1) Printed wire between R311 pin3, R410,
R412, I307 pin1 is failure..
2) Q311 is failure.
NG
Check if the voltage
between I307 pin2 and
pin3 is above -0.7V
OK
NG
Check if the Q311 pin2 of
PANEL Power_ON/OFF
signal that outputted by I305
pin10 is High level.
NG
Failure Point
1) Printer wire between R411
and I305 pin10 is failure
2) I305 is failure.
3) R413,C366 is short
OK
Failure Point
I307 is failure.
Check the P305 all LVDS signals.
Failure Point
1) Printed wire broke betweenP305 and
I305 LVDS signals.
2) I305 is failure.
OK
NG
Failure Point
1) The LVDS cablebroke between P305
and LCD module.
2) LCD module isfailure.
NG
Proceed "Checking the DC/DC converter
circuit" section.
NG
Check the I307 pin2 if
voltage is 5V
Failure Point
1) FB312 is open.
2) C353, C355 is short.
OK
Check the I309 pin2 if
voltage is 1.8V
OK
NG
Proceed "Checking the DC/DC converter
circuit" section.
Check the inputvoltage levelwhetherwas changedwhen
pressed function keys onthe P304 pin 5 (normal is high level,
when push buttom, generated 2.2V/1.9V/0.7V)
Failure Point
1) Printed wire broke betweenP304 pin 5
and I305 pin 20.
Check if the voltageon I305 pin 20 that is
from 3.3V to 0.7V.
OK
NG
Failure Point
I305 is failure
OK
NG
21
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ACER X193HQ