Acer RA19WAANU 5.2 Nothing displays on the screen (Screen is black and colour of LED is blue)continued, 21

5.Troubleshooting (continued)
5.2 Nothing displays on the screen (Screen is black and colour of LED is blue)continued
Continue
Checkthe 5V power supply for
P305pin 1,2,3.
OK
Checkthe I301 pin2 if
voltageis 3.3V
OK
FailurePoint
1)Printed wire between R311 pin3, R410,
R412,I307 pin1 is failure..
2)Q311 is failure.
NG
Checkif the voltage
betweenI307 pin2 and
pin3is above -0.7V
OK
NG
Checkif the Q311 pin2 of
PANELPower_ON/OFF
signalthat outputted by I305
pin10is High level.
NG FailurePoint
1)Printer wire between R411
andI305 pin10 is failure
2)I305 is failure.
3)R413,C366 is short
OK
FailurePoint
I307is failure.
Checkthe P305 all LVDS signals.
FailurePoint
1)Printed wire broke between P305 and
I305LVDS signals.
2)I305 isfailure.
OK
NG
FailurePoint
1)The LVDS cable broke between P305
andLCD module.
2)LCD module is failure.
NG
Proceed"Checking the DC /DC converter
circuit"section.
NG
Checkthe I307 pin2 if
voltageis 5V
FailurePoint
1)FB312 is open.
2)C353, C355 is short.
OK
Checkthe I309 pin2 if
voltageis 1.8V
OK
NG Proceed"Checking the DC /DC converter
circuit"section.
Checkthe input voltage level whether was changed when
pressedfunction keys on the P304 pin 5 (normal is high level,
whenpush buttom, generated 2.2V/1.9V/0.7V)
FailurePoint
1)Printed wire broke between P304 pin 5
andI305 pin 20.
Checkif the voltage on I305 pin 20 that is
from3.3V to 0.7V.
OK
NG
FailurePoint
I305is failure
OK
NG
21
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ACERX193HQ