Roytor
1 Copper

T7500 won't turn on

Hello,

 

I could not turn my T7500 on as when I pressed the power button, nothing happened, no light nothing. So, I disconnected the power cord from PSU to motherboard and test with BIST function and the light at BIST flash. However, when I reconnected the line back, nothing happened when I pressed BIST button. Can I confirm that this is the motherboard problem or is there still other possibility of the failure?

 

At this point, I think I will try to replace CMOS battery with the new one. If that doesn't work, I will order the motherboard from ebay. Any idea?

 

Thanks a lot,

Roytor

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6 Replies
8 Krypton

Re: T7500 won't turn on

It could be the motherboard but the only way to test a PSU is to try another PSU. A PSU may seem to test fine but under load may fail. I would go PSU first being the easiest and cheapest.




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Roytor
1 Copper

Re: T7500 won't turn on

Thanks a lot. Today we tested the PSU with PSU tester and it worked fine. So, I think the problem is the motherboard, however, would it be something else on the board like CPU?

Also, today I tried to replace the new motherboard. Unfortunately, I could not access the screws under the dual processor riser. Could you advise how to remove that.

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8 Krypton

Re: T7500 won't turn on

T7500 Service Manual

T7500 Tech Guide

You'll find removal of the riser in the service manual.  It has links that will get you right there.  Adding or replacing parts > Dual processor riser

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8 Krypton

Re: T7500 won't turn on

I believe you would get a diagnostic light code if it were the CPU.  Codes are also in the service manual.

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8 Krypton

Re: T7500 won't turn on

BIST is not diagnostic for motherboard.

BIST Light Should not go out.

If it does your power supply is bad.


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8 Krypton

Re: T7500 won't turn on

No, BIST LED not turning on does not mean the PSU is bad.  It means there is something inside the workstation that causes a power failure, and nothing more.  Please, take a loot at this video from TechSupportDell to understand how this feature works and isolate the component that makes the power fail on the workstation.

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