Philips BDP7700 Service Manual page 23

Can't read disc or can't open the disk door
Can't read disc or can't
open the disk door
Check
cable from main board
connection to the loader is
normal
Check
voltage is normal (about
9.5V)
Check R724/R726 are normal
(the voltage between two
resistance is 1.5V
GO
Check whether the
DVD loader running is
normal
Yes
45pin and 9pin
Yes
if U15(pin24)
Yes
Yes
Replace the loade r
4-4
NO
Check the connection 4pin cable from the
main board
NO
Fix the connection the 45pin cable or
9pin cable.
NO
Fix FB19
voltage is OK(about 12V)
NO
Fix or Replace R724/R726
Trouble shooting chart
or check
U14(pin3)