shards of graphic doom fill the screen
I've postponed dealing with the display issues for several years by using SMCfancontrol, but am now in the same boat as previous posters. 2.16Ghz white imac A1207, shards of graphic doom fill the screen, over heating happens swiftly, and it just won't run anymore. I've done one take apart and clean out, hoping it would help, but no joy. Trying to locate replacement parts in advance of a deeper look inside, but having trouble finding what I need, although powerbookmedic.com has quite a nice inventory. Wondering if it's the inverter, rather than the GPU. The guide I'm using is here - iMac Intel 20" EMC 2105 and 2118
Small variances in build from those steps, but nothing too tough as long as you take your time. Reassembly is tricky though, really do stop and get all the freaking tape out of the way, it'll spare you some misery.
- Macgeek
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Macgeek - To start with you should make your own question as this one is quite old (even if it's a similar problem). Can you more fully explain what "Shards of graphic doom" is, I do like the line ;-} Are you seeing odd color blocks {static} or fading areas? You might want to get a temp monitoring program like Temperature Gauge so you can see whats happening.
par Dan
Thanks Dan - smcfancontrol does have temp monitoring capabilities, and I'm pretty sure that the cpu fan is no longer working, but now can't get it to boot normally, and need to determine if there's any fixing this imac. Will go start my own question - liked this thread because it's the same model, same issues, and there have been good suggestions, so I hoped the previous posters would respond with what worked.
par mugszee
Currently, the imac boots up to desktop, but on fully loading the Finder, it self-reboots. Shards of doom continue, broken boxes of grey noise, triangles of smeared pixels from background, thin black lines horizontally. Only 3 lights on board instead of the 4 in the docs; All 3 light as one might expect, and even the third light stays on during auto-reboot. Inverter or GPU or logic board? Anyone?
par mugszee
Thanks folks, I'm looking at logic boards and thinking that any I buy may have the same issue, so want to try reflowing it. What I'm seeing on youtube is all related to laptops though, and folks are doing them in various stages of disassembly. Does anyone have any info on how far down I need to tear this logic board? For instance - pull off the heat sinks? IR board? Also, since it seems to vary - what's the best practice - pre-heat the oven and put the cold board in there, or put the board in cold and let it all warm up slowly? I've reflowed spots on boards with a blow dryer before, with moderate temporary success - just a little nervous about putting an imac in the oven.
par mugszee
mugszee, you can not reflow with a hair dryer! Check on here Hair dryer for logic board reflow? for the analyses :-) So we'll have to try and find a reflow profile for the GPU. May take a bit, in the meantime, take a look through youtube. If I remember right there are a few videos about reflow on a couple of G5's, just to get an idea.
par oldturkey03