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Philips DVP3980KX/77 Service Manual page 11

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Only DVD disc or only disc except DVD can be played
Only DVD disc, or only disc
except DVD can be Played.
Go
Check
connection between
24pin and the loader.
Yes
Check laser voltage (2V) output
on Collector of Q14 if pin 22 of U1
is at low level.
Yes
Check whether there
is voltage variance on
pin 22 of U1.
Yes
Check whether pin 1 to pin38
of
U1
and
components
soldered, defected
Yes
Check Q10, Q11,
Q12
whether in
good condition
Yes
Change U1 or the loader.
the
FFC
peripheral
are
badly
No
3-5
No
Check the loaded circuit
Check the solder status on U1 and
No
peripheral components
No
check if bad solder exist on U1 and
peripheral components
No
Replace the bad spare parts
Correct connection
Trouble shooting chart

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