User Guide

iMac (Early 2006 20-inch) Troubleshooting — Symptom Charts 154
Yes: Replace the original SDRAM and test again. If the front LED does not go o with the only
the original SDRAM installed, replace the SDRAM. If the LED is now reliably going o after a
few moments, but yet you still do not have any video, go to step 8.
No: If the LED remained on, the main logic board is not communicating with the LCD panel
to generate video. Replace the main logic board.
7. With the LED going o, you may have a No Backlight condition or an LCD failure. In a dim room,
turn the display at an angle to you and look closely at the display. Is the display completely black
or can you see a dim, purplish light or glow to the display?
Completely black: Replace the inverter
Dim purplish light or glow: Replace the LCD panel.
Video Distortion After Waking From Sleep
Shimmering, Vertical Lines, Horizontal Lines
The iMac (Early 2006) will wake from sleep, but a slight shimmering of the image may be visible.
In some cases the shimmering on the display may worsen so that the display lls with vertical
lines, horizontal lines, or the image begins to shake (refer to the following four images samples.)
Continue with the procedure to correct the issue.
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