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2.PANEL-POWER CIRCUIT
check R302 should have response from 0V to 5V
When we switch the power switch from on to off
Measured the Q302 pin 5,6,7,8= 5 V?
OK
3.I
NVERTER Control Relative Circuit
Measured the inverter connector CN402
pin 1 on/off control=5V (on)
pin2 PWM signal control dim 0V-5V
Replace Power board to new-one, and
Check the screen is normal ??
OK, R308 have
NG, no Voltage
OK
NG, still no screen
OK
Check the PPWR panel power relative circuit,
NG
Q301, Q302(pin 5,6,7,8)
In normal operation, when LED =green, R302
should =0 v,
Check U202 pin 1,2,3,4= 5V
Replace Q302 ( N-MOS, SI993
NG
Check the Bklt-On relative circuit, R405, R404, R415,
In normal operation, when LED =green,
R405 Bklt-On should =5 v,
If Bklt-On no-response when the power switch turn on-off,
Replace U203 GM5120/2120
NG
Replace Power board
& Re-do white balance
Yes
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