Read Sony DVP-FX720 Service Manual online
9-4
START
Power on
Power
green LED
on
Do all
the buttons work
normally?
Does
remote control work
normally?
Check P_3V3
Check IC MT1389
Does IR1 work
by testing waveform
normally?
Is battery OK?
Check
J9 on the
mainboard
Check IC MT1389
Replace IC MT1389
Replace IC MT1389
Replace battery
Replace IR1
Check the buttons
Is P_3V3 OK?
Do
the U2 work
normally?
Check power
Replace U2
3. Front Circuit (Dogotrpm & key)
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
YES
YES
NO
NO
NO
NO
YES
NO
NO
NO
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