Service manual

R910E Service Manual
29
7.2 TROUBLE SHOOTING
7.2.1 MAIN BOARD
1.NO SCREEN APPEAR
Note: 1.If replace “MAIN-BOARD”, Please re-do “DDC-content” programmed & “WHITE-Balance”.
2. If replace “Inverter Board” only, Please re-do “ WHITE-Balance”
No picture
The button if under
control
X501 oscillate
waveform is normal
Replace U502
Check
Correspondent
component.
Measure U902/U905
PIN2=2.5V
U903/U904 PIN2=3.3V
Check Correspondent
component
Replace IC301
X600 oscillate
waveform is normal
Check Correspondent
component.
OK
OK
OK
OK
NG
NG
NG
NG
NG
HS/VS input signals are normal
Check Correspondent
component.
NG OK