Apple 2009 iMac - Page 40

iMac (21.5-inch, Late 2009) Symptom Charts — Startup and Power 40
2010-11-18
3. For systems without a separate
video card, go to step 4. If a
video card is present, remove
video card, inspect connector
for damage or corrosion.
Reinstall video card and retest.
Verify if issue still occurs.
Yes Replace video card.
Go to step 4.
M04
No Issue resolved by reseating
video card.
4. Verify if video corruption issue
is still present.
Yes Replace logic board. If a video
card was replaced, reinstall
the user’s original video card.
Go to step 5.
M04
No Issue resolved with
replacement video card.
5. Verify if video corruption issue
is still present with replacement
logic board installed.
Yes Return to step 1 and retest. X04
No Issue resolved with
replacement logic board.
M04
6. Inspect glass panel. Verify if
issue is caused by condensation
or contaminants on inside/
outside surface of glass panel,
or on surface of LCD panel.
Yes Clean glass and/or LCD using
procedures in Glass Panel
take-apart chapter.
Identify possible sources
of contamination (nearby
cigarette/cooking smoke,
heavy airborne dust, etc.)
to prevent recurrence.
Condensation should
dissipate after computer has
been running a few hours.
No Go to step 7.
7. Disconnect LVDS cable
between LCD display and logic
board, and verify if there is
damage to cable or connectors.
Repeat with vertical sync cable
connected between LCD panel
and LED backlight board.
Yes Replace LVDS cable or any
other damaged part/module.
X03
No Reinstall LVDS cable and
vertical sync cable.
Go to step 8.
8. Verify if issue is still visible after
reinstalling/replacing LVDS
cable and vertical sync cable.
Yes Replace LVDS cable and LCD
panel. Go to step 9.
L04
No Issue resolved with reseating
cables.
9. Verify if issue is still present
with replacement LCD panel
installed.
Yes Return to step 1 and retest.
No Issue resolved with
replacement of LCD panel.
L04