Philips for Intel Socket 775 processor Service Manual page 23

Operating voltages exist, but there
is no Display.
No Display is related with Y-Main,
X-Main or Logic-main board
Check Logic Main
Dip switch is on
Internal mode!
LED blinks?
Yes
Check V-Sync
OK
on test point logic
main board
OK
No
Logic main
normal state
Check Power
supply on Logic mains.
3V3 & 5V.
Not OK
Replace the Logic-
main board
No Display
repair set-up as standalone
Check Y-Main board
Waveform
on Y Buffer
test point ?
OK
Not OK
Check Fuse ?
OK
Check FET
Short?
Check
Open Y Buffer Uper
and Lower?
Yes
Not OK
Replace the
Replace Y buffer
Y-main board
Figure 5-10
Diagnostic software S/SD/HD 3.1 PDP
No Display
Bring set in
OK
OK
No OK
OK
Y-Main & Y-buffer
normal state
Replace PDP Panel
5. EN 23
Scavio or SSB is
disconnected and removed.
Power supply will be started-
up with Jig connector and
DIp swithc on Logic main is
on internal mode.
Check X-Main board
Waveform
on X-board
test point ?
Not OK
Check Fuse ?
OK
Check FET
Short?
Open
No
Yes
X-Main
normal State
Replace the
X-main board