Philips HTD5540/12 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
DVD loader running is
normal
Check 24pin cable from
main board connection to
the loader is normal
Check if U20 (pin110,111)
voltage is normal
Yes
Check if
voltage is normal
Yes
Replace the loader
GO
whether the
Yes
Yes
XP100 (pin2,6)
5 - 4
NO
Check the connection 4pin cable from the
main board
NO
Fix the connection the 24pin cable
NO
Replace main board
NO
Relace Q100,Q101
Trouble shooting chart