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QNAP TS-451 power issue (on motherboard)

This unit has an external power supply (brick). I believe I have a component issue somewhere on the motherboard. Possibly between the DC input and the power button. The unit will briefly power up then shut down. I hear a soft “click” before it turns off. Customer service was unable to resolve the issue and the board is not an available item. I’ve tried a different (good) power supply with the same result. I bought a new replacement NAS. So, this broken one is ready for the workbench or trash can. Anyone game to trouble shoot?

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Does it boot without the drives installed?

If so, install them each one-by-one until it fails again.

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Hi @scfirnatine

Any beeps?

same as this?

https://www.reddit.com/r/qnap/comments/6...

considering taking everything out, hard disk, if there are multiple memory, take out and test with one stick at a time

by

That Reddit video is accurate except my hand is much better looking. I'm practicing to be a hand model. Haha.

It doesn't boot and no beeps. It shuts down before it has a chance to boot up. The fan will spin at low speed for about 1 second. All the HHDs are removed and it has a good memory module. I've conducted about 5-6 sessions with tech support and they believe its a faulty circuit on the board. I'm hopeful that its a capacitor, resistor or other easily identified replaceable component. I need help with troubleshooting the board, if possible.

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@scfirnatine suspect it could be mosfet shorted, but can try looking at there first.

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Thank you for the suggestion

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Unless you have a service manual or circuit diagram, tracing the issue could be difficult. Do you own a multimeter and know how to use it?

If so, you should check the resistors and capacitors you can see. Capacitors can be tricky as you may need an ESR meter to see if they are in the process of failing. Start with resistors and any thermal chokes, fuses, etc you can locate. After that, check any power transistors and if you can identify various IC’s, make sure they have correct supply voltage to them when powered. You will need to sleuth out datasheets for the IC’s if you don’t have a service manual using the codes printed on them. Sites like Dig-Key and Mouser are good about listing datasheets for components.

Replace all out-of-spec (remember tolerance can be up to 20% on some parts) components. If any IC’s are not receiving the correct voltage, trace those paths back to the power rails to see if you can find where the voltage drops/stops.

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Jeffrey Hartberger will be eternally grateful.
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