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Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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Problem with ASD 3S116 testing: GPU 0 Die Test 1

Hi Guys,,

What can you tell about my problem ?

Revision of iMac Mid 2007 strats up screen goes black (LED 4)

My presumption:

The first issue is the heatsink, then wrecked the videocard (vertical lines).

New heatsink, with other videocard.

Problem with ASD 3S116 testing: GPU 0 Die Test 1

Error: Sensor reading above alarm point. TEST FAILED.

The cable that leads towards the GPU heatsink has two cables.

The connector is not in the best condition.

Can the contact be broken ?

Hope to solve this issue.

Thanks, Arnoud

Update

Hi Dan, are you sure the connector has come loose. It's firmly attached into it's socket. Secured with kapton tape.

It reads out a temp, are you sure it's the connector that's at fault here ?

Update

Hi Dan,

Sorry, can't do that, the lcd screen goes black after 2 minutes.

I will replace the videochip and hopefully the connector on the heatsink by my repairman.

Thanks for your help.

I will update the question with the results.

Answer this question I have this problem too

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1 Comment:

The trick here is to use a second Mac and share the iMac's screen with it. Often I use this when I have dead screen issues trying to isolate out if the LCD is bad or if the sensor pop'ed shutting it down. In your case it's likely the GPU.

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You do need to reconnect the thermal sensor, if the connector is in tough shape you may need to replace the heat sink unit as you can't get the sensor alone.

Update >> 8/24/15

OK, lets get some clarity here. You stated the connector was in bad shape "The connector is not in the best condition." The GPU & CPU both have thermal sensors. The one that plugs into the logic board nearest the CPU is the GPU sensor. The one closer to the heat fins is the CPU sensor.

If you are sure the connections are firm and the sensor (both) and its cable are good we'll need to start afresh here.

For now lets see what this tells us: Temperature Gauge Pro. Post a screenshot of the sensor details in your question.

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