Table of Contents
Advertisement
2.PANEL-POWER CIRCUIT
check R302 should have response from 0V to 5V
When we switch the power switch from on to off
OK,R308 have response
Measured the Q302 pin 5,6,7,8= 5 V?
OK
OK
3.I
NVERTER Control Relative Circuit
Measured the inveter connector CN402
Pin2 on/off control=3.3V (on)
Pin4 PWM signal control dim 0V-5V
Replace Power board to new-one, and
Check the screen is normal ??
OK
All manuals and user guides at all-guides.com
NG
NG, no Voltage
NG
NG, still no screen
NG
Check the PPWR panel power relative circuit,
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
Yes
Replace Q302 ( Nmos, SI9933
Check the Bklt-On relative circuit, R409,
In normal operation, when LED =green,
R409 Bklt-On should =5 v,
If Bklt-On no-response when the power switch turn on-off,
Replace U203 GM5120/2120
Replace Power board
& Re-do white balance
35
FSC B17-1 Service Manual
Advertisement
Table of Contents
