Iiyama PLE385 Service Manual page 28

2.PANEL-POWER CIRCUIT
Check R98 should have response from 12V to 0V
When we switch the power switch from on to off
OK
Measured the Q12 pin 3= 12V?
OK
3.I
NVERTER /DC-DC Power board Control Relative Circuit
Check the CN3: Pin 1= Lamp current control
CN3 : Pin 2= Inverter on-off control
When power switch off ( LED orange)
NG
NG, no Voltage
OK,
Check the CN3 cable loose or tight?
must have 0 volt to 5 volt Voltage variable when adjust Brightness
must have 5volt when power switch on ( LED green ) and must have 0 volt
Replace Inverter module to new
Page 28 of 50
Check the PPWR panel power relative circuit, Q12.Q13
In normal operation, when LED =green, R98 should =12 v,
If PPWR no-response when the power switch
Turn on and turn off, replace the U6 MRT
Check Q13 pin 2= 3.3V
Replace Q12 ( SI1014)
PLE385 Iiyama
Yes