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3. White screen
White screen
Measure Q707 base
is low level?
X402 oscillate
waveform is normal
Check Q705,Q706,Q707 is
broken or CN703 solder?
Check Correspondent
component.
Replace PANEL
Replace U403/U407
OK
OK
Replace X402
NG
NG
Check U403/U407
NG
OK
NG