FSP250-60GEN Fan Voltage Problem

[jm20101]

Hello members of badcaps,

At the moment, I have a problem with this PSU.
The fan port has only 3.4 volts on it, so the 120mm fan would not spin up.
I have a video here: http://www.dailymotion.com/video/k3eZCXdY8MTtnO3OtQ4
Is this normal? I attached a picture of the fan port too.

[Khron]

Re: FSP250-60GEN Fan Voltage Problem

No.1: CapXon = baaaaaaad
No.2: is that heat-discoloration of the board that's visible at the pins of that transistor (Q90)?

Does the rest of the PSU work (properly)?

[jm20101]

No.1: CapXon = baaaaaaad
No.2: is that heat-discoloration of the board that's visible at the pins of that transistor (Q90)?

Does the rest of the PSU work (properly)?

That was a old picture, I already have recapped the CapXon for TEAPO SY series.
The Q90 transistor is a : ksp2222a.
The rest of the PSU is working fine.

[Khron]

Re: FSP250-60GEN Fan Voltage Problem

Hmm... Well then, maybe it's just a (really) conservative setting of the fan-controller?

Do you have a heat-gun or a hair-dryer or something? Blow some warm/hot air towards where the thermistor is (on the secondary heatsink) and monitor the fan voltage. If it goes up, then i guess it might/should be normal.

Then again, you can always solder in a resistor in parallel with that thermistor

[jm20101]

Re: FSP250-60GEN Fan Voltage Problem

Hmm... Well then, maybe it's just a (really) conservative setting of the fan-controller?

Do you have a heat-gun or a hair-dryer or something? Blow some warm/hot air towards where the thermistor is (on the secondary heatsink) and monitor the fan voltage. If it goes up, then i guess it might/should be normal.

Then again, you can always solder in a resistor in parallel with that thermistor

Yeah, I will try that tomorrow. But it is still strange that the fan is not spinning.

I have much resistors here, but I am a bit newby and don't know where I should place a resistor if I want to get the fan working. And also the value of that resistor.

[Khron]

Re: FSP250-60GEN Fan Voltage Problem

Well, a 12v fan won't do much at 3v It's more likely it'll start somewhere around 5v, at least.

Well, first you can find the thermistor, and follow its leads to where they're soldered into the board. Then you can measure its "cold" resistance with your multimeter. Then you can put your finger on it, and its resistance should drop slightly, and come back up after you take your finger off it.

As a first step (after the above-mentioned testing), you could try (carefully) soldering in a resistor, say, twice the "cold" value of the thermistor. You should at least get a slightly higher fan voltage that way, without endangering anything (else)

[LDSisHere]

Re: FSP250-60GEN Fan Voltage Problem

Often the transistor that drives the fan burns out so you may want to replace it and see if that solves your problem if modding the thermistor does not solve your problem.

[jm20101]

Re: FSP250-60GEN Fan Voltage Problem

Often the transistor that drives the fan burns out so you may want to replace it and see if that solves your problem if modding the thermistor does not solve your problem.

Then I will try to replace the transistor, can I use a ksp2222 as well?

[Khron]

Re: FSP250-60GEN Fan Voltage Problem

At least for testing, it should be ok, but... Maybe see if you can find one of those "longer" TO92-case NPN transistors, they're usually rated up to 1A and 1W dissipation (as opposed to 600mA / 625mA for the 2222/A)

[jm20101]

Re: FSP250-60GEN Fan Voltage Problem

At least for testing, it should be ok, but... Maybe see if you can find one of those "longer" TO92-case NPN transistors, they're usually rated up to 1A and 1W dissipation (as opposed to 600mA / 625mA for the 2222/A)

I have found some on ebay: http://www.ebay.com/itm/NEW-50-X-2N2...item4aa04a35e3 Will they working?

[tom66]

Re: FSP250-60GEN Fan Voltage Problem

I had the same problem before on a PSU, and replacing the transistor fixed it. Fan was only receiving a few volts and transistor was seriously discoloured -- looked like it had cooked itself...

[LDSisHere]

Re: FSP250-60GEN Fan Voltage Problem

I have found some on ebay: http://www.ebay.com/itm/NEW-50-X-2N2...item4aa04a35e3 Will they working?

These are some very common transistors and you should be able to easily scavenge one from some scrap electronics.

The quality of those Ebay components from China are hit or miss and usually more miss than hit. Plus it will take a few weeks for them to arrive but it is your dime and your time, I just want to give you some forewarning.

[ben7]

Re: FSP250-60GEN Fan Voltage Problem

Agreed on the ebay junk.

These extra long to-92's you are looking for are in the TO-92L (or TO-92 MOD) package to be exact