Service manual

EPSON ELP-3500 Service Manual
4-3
YES
NO
Figure 4-2.
SYSTEM INITIALIZATION
START
Turn on power.
Does the projector have power
(POWER LED is lit)?
Reconnect the cable between
the control panel and main
board.
Does the POWER LED
light now?
Check fuses FU500 to 505 on
the main board, and if bad,
replace the main board.
Does the POWER LED
light now?
Replace the control panel.
Does the POWER LED
light now?
Replace the ROM (IC304)
on the main board.
Replace the power supply.Does the POWER LED
light now?
YES
YES
NO
NO
NO
NO
NO
NO
NO
NONO
NO
NO
Go to
“Display
Mode.”
Do the fans work?
Check CN502 and CN503
connection on the main board
and on the driver board.
Do the fans work now?
If fuse FU501 is blown on the
main board, replace
the main board.
Do the fans work now?
Replace fans.
Is lamp indicator
normal?
Check CN505 connection on
the main board. Is it OK?
Is lamp indicator normal
now?
Replace the driver board.
Is lamp indicator normal
now?
Replace the main board.
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
Do fans work now?
Replace the main board.
After you replace the main
board, does the POWER
LED light?
NO
YES