FSP 600-80EPN Help

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davidt

n00b
Joined
Jan 6, 2022
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I am working on a blown FSP power supply with its TNY278 blown plus some other parts but what i need most is a resistor value of R26 an smd located on its underside taking a start voltage from the mains capacitor.

Can anyone help please or have a circuit for this range.

davidt
 
Power supply manufacturers almost never release the schematics to their units. The only way to figure out what that resistor was is to reverse engineer the circuit its in, or have a not-exploded second unit that's 100% identical to the one you have. That can be an issue because sometimes even though the model is the same, the PCB used can be different revisions, which won't help.

But if that power supply was insulted enough to have a mosfet blow up, you're basically going to have to change everything, because you don't know what else took a hit. Something may test fine, but be marginal under load, fail and take out what you repaired, putting you into a dog chasing tail situation.

If this were some rare unobtanium or hideously expensive supply, it may be worth saving, but that's just a plane jane generic 600W ATX supply. I would recommend just scrapping it and buying a new unit, you'll spend more money trying to fix it than its worth.
 
GiGaBiTe said:
Power supply manufacturers almost never release the schematics to their units. The only way to figure out what that resistor was is to reverse engineer the circuit its in, or have a not-exploded second unit that's 100% identical to the one you have. That can be an issue because sometimes even though the model is the same, the PCB used can be different revisions, which won't help.

But if that power supply was insulted enough to have a mosfet blow up, you're basically going to have to change everything, because you don't know what else took a hit. Something may test fine, but be marginal under load, fail and take out what you repaired, putting you into a dog chasing tail situation.

If this were some rare unobtanium or hideously expensive supply, it may be worth saving, but that's just a plane jane generic 600W ATX supply. I would recommend just scrapping it and buying a new unit, you'll spend more money trying to fix it than its worth.
Click to expand...

All true just hoped it was a problem seen before so had been resolved, it was to become a basis for a general power supply.

I have quick checked that no more power section areas seem affected (no big shorts) That TNY is from a family of low power supply generators which I have seen in AC-DC adapters, I have some with lower code number (lower power) so I assume its used as a prestart supply.

The damage is to my mind local, that resistor is possibly a power start part, in the past used to be two or three resistors in series as that primary voltage (about 300v) is apt to jump/leak a small gap. This supply uses just one SMD so to me this is bound to happen as surface muck builds up acting as a conductive element.

I will keep looking for a while may get lucky, thanks so far.............

davidt
 
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