flickering monitor iMac early 2006

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iMac Intel 20" EMC 2105 and 2118

Model A1174 with 2 GHz Core Duo or Model A1207 with 2.16 or 2.33 GHz Core 2 Duo

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Gianluca @gianluca21177

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发帖于: 2011年2月5日

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flickering monitor iMac early 2006

Hello guys,

I would like to have your help about a problem I’m having with my old imac:

this one

very often when I turn on my imac the screen has these colors (I made a video with EyeTV on for maximum effect).

most of the time, just put on sleep mode the monitor and the screen returns to normal.

Sometimes the opposite happens :at start up all its fine,but if the monitor get in sleep mode the problem come back.

I have a Apple iMac "Core Duo" 2.0 20-Inch model a1174 (no emc on the “foot” )

The front panel has allready been replaced (problem of vertical lines,always after sleep or screen saver ) years ago,but instead of the vertical lines i had this new issue !

I know its an old mac,but I would like to understand what its happening.

Thx for the help and sorry if I made mistakes,English its not my language!

Gianluca

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could it be the inverter at this point ?

由 Gianluca 完成的 2011年2月8日

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mayer @mayer

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I don't think this has anything to do with the system. Looks like a hardware issue to me. See if you can isolate it by hooking up to an external monitor and see if the problem persists.

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i'll troubleshoot this way and update as soon as possible..thx for the help!

由 Gianluca 完成的 2011年2月5日

i'm back mr Mayer !

with an external monitor its all fine as you can see:

http://yfrog.com/7dfile1165z

is it a good news or not ? :)

what it could be the problem?

thx so much !

由 Gianluca 完成的 2011年2月7日

This narrows it down. The GPU is good. I don't remember if this machine shares RAM but it costs nothing to test the RAM first. Next the inverter and then the LCD. Maybe Lemrise will chime in on this one. I'll put him in the tags so maybe he will see it.

由 mayer 完成的 2011年2月8日

i made a memory test with an utility called "Rember" and no memory issues were found...waiting for Lemrise i'll look around for some inverter :) thx so much

由 Gianluca 完成的 2011年2月8日

I had to do some study on this one. Defective CCFL backlight may have the following symptoms:

Screen flashes on red/pink and goes off.

Picture stays on in red and slowly be come normal.

Picture flickering with dim display.

Picture flickering on and off.

All these symptoms indicate that the LCD backlight lamp (CCFL Lamp)

has reached the end of the life and all you need to do is replacing the CCFL lamp. I'm trying to learn more on this. This link sells the backlights and has a guide to do it. These lights are very cheap compared to a new LCD. I'm going to post a question on Meta and see if I can't gather more information on it and maybe try to do a guide. http://www.lcdparts.net

由 mayer 完成的 2011年2月10日

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i'll troubleshoot this way and update as soon as possible..thx for the help! — Gianluca
i'm back mr Mayer !

with an external monitor its all fine as you can see:

http://yfrog.com/7dfile1165z

is it a good news or not ? :)

what it could be the problem?

thx so much ! — Gianluca
This narrows it down. The GPU is good. I don't remember if this machine shares RAM but it costs nothing to test the RAM first. Next the inverter and then the LCD. Maybe Lemrise will chime in on this one. I'll put him in the tags so maybe he will see it. — mayer
i made a memory test with an utility called "Rember" and no memory issues were found...waiting for Lemrise i'll look around for some inverter :) thx so much — Gianluca
I had to do some study on this one. Defective CCFL backlight may have the following symptoms:

Screen flashes on red/pink and goes off.

Picture stays on in red and slowly be come normal.

Picture flickering with dim display.

Picture flickering on and off.

All these symptoms indicate that the LCD backlight lamp (CCFL Lamp)

has reached the end of the life and all you need to do is replacing the CCFL lamp. I'm trying to learn more on this. This link sells the backlights and has a guide to do it. These lights are very cheap compared to a new LCD. I'm going to post a question on Meta and see if I can't gather more information on it and maybe try to do a guide. http://www.lcdparts.net — mayer

lemerise @lemerise 声誉积分: 37.6千 315 66 72 · Answer 1 · 2011-02-12T10:14:44-07:00

lemerise @lemerise

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I'd say you got a bad LCD panel or a faulty video cable. You should first try to reseat the video cable both ends and if no result, replace the cable. If it doesn't work find a used working panel on ebay.

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ok,just tell me good luck: it's the very first time i try to put the hands inside my imac.

thx for the help !

由 Gianluca 完成的 2011年2月12日

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remacberlin @remacberlin 声誉积分: 13.3千 45 21 11 · Answer 2 · 2011-02-05T15:30:17-07:00

remacberlin @remacberlin

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Hi Gianluca - since your Mac is acting up more or less at random and works fine otherwise i would try to save your data and do a clean install of the OS.

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hey there ! thx for thefast response. i tried that way but without success: from tiger to snow leo the issue remain the same :)

由 Gianluca 完成的 2011年2月5日

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iMac Intel 20" EMC 2105 and 2118

flickering monitor iMac early 2006

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