Front Circuit (Dogotrpm & Key) - Sony DVP-FX850 Service Manual

3. Front Circuit (Dogotrpm & key)
START
Power on
Power
green LED
on
YES
YES
Do all
the buttons work
normally?
YES
YES
Does
remote control work
normally?
YES
Check P_3V3
YES
Does IR1 work
by testing waveform
normally?
YES
Check IC MT1389
NO
Is P_3V3 OK?
YES
Do
the U3 work
normally?
Check
NO
J3 on the
mainboard
YES
Check IC MT1389
NO
Is battery OK?
YES
NO
Replace IR1
NO
Replace IC MT1389
NO
Check power
NO
Replace U3
NO
Check the buttons
NO
Replace IC MT1389
NO
Replace battery
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