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3. Checking the back light unit
Is +12V supplied to inverter PWB?
N G
O K
Check the BKLT_EN signal of the rectangle input P310 pin 2 at TTL high level
N G
O K
Check the PWM signal of the input from I315 pin M4 (R374 pin 2) is a PWM signal.
O K
Failure point
1) Inverter cable disconnection.
2) Inverter of LCD module failure.
Trouble Shooting
Failure point
1) Inverter cable disconnection.
2) Power board failure.
Is a "H" level being output in the TTL level from I302 pin 29
Or, is BKLT_EN signal of the rectangle being output?
N G
Failure point
Printed wire broke between
I302 pin 29 and R326.
Failure point
N G
1) Printed wire broke between
I315 pin M4 and R374 pin 2.
2) I315 failure.
B17AAU / B17ANU / B17AAY
Page 5
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