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Help identify cpu capacitor on my laptop

Hi,

This is an Acer Aspire 4738 laptop with cpu area overheated creating intermittent os hangup. I had changed a new cpu fan and apply new thermal paste but the hangup is still there.

At the back part of the triangle cpu area, there are 3 smd tantalum capacitor with marking of 330 on first row and 08D1Y on second row. Not too sure what voltage rating are those caps but i suspect 330uf. I tested them by desoldering one leg off and esr reading is about 17Ω… which is way too high. Does anyone know what could be the voltage rating like is it 2.5v or 6.3v?….

I have been searching for schematic or parts list but unable to find. I think i need to buy replacement cap for those 330 but unsure of the voltage rating. Please help. Thank you.

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@mikey5791 the 3 digit capacitor code 330 stands for 33 pF. As for the voltage you can’t go wrong with the 6.3v on a cap since its capacitance is the importance not the voltage.

The only other way to find out would be by getting a schematic for your board. It may or may not be available so that would be a bit of a crapshoot

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Hi oldturkey03,

Thanks for reply.

When i measured the capacitance on those 330 caps, they are more or less in the range of 325 to 360uF. Thats why i m a bit confused since you mentioned they are 33pF type. Are those caps getting bad slowly now ?

Schematic is not available from any source at all. Cheers.

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@mikey5791 ,

Are you sure that the marking on the capacitor is 330?

Using this calculator @oldturkey03 is correct in that 330 = 33pF.

325uF = 327 and 360uF = 367

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@jayeff

Hi,

Yes, definitely the marking is 330 on those caps.

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@mikey5791 ,

Did you try searching for the schematics using the "board number" of the motherboard?

Just curious as to what is the maximum capacitance that your meter can measure?

I have read that tantalum is always in uF but not sure about this as you can get tantalum <1uF so how would they mark it on the case?

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Hi jayeff,

Yes, i did google using board number DAOZQ9MB6CO REV:C as well but the schematics was for an earlier version of 1A.

Fyi, my caps meter Sunwa KS-7115 can measure from 200pF up to 20mF. So, i guess this meter can measure tantalum caps lower than 1uF.

Thanks for your comments.

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Hi @mikey5791 ,

Did you find the capacitors in the REV.A version?

Sometimes a revision change does not entail a major upgrade or difference in all parts of the circuit.

If you do find them in the schematics then check what voltage rating they have listed and if this is not shown look at the voltage shown in the schematic that is being supplied to that particular area of the board to roughly work out what the rating could be.

The capacitor's voltage rating is only important in that it has to be higher than the voltage that is being used in that area of the circuit.

This is so the capacitor is not going to be damaged by being used in a circuit where the voltage is higher than what it can tolerate and also you don't want it operating at the upper limits of its' voltage rating either e.g. if the voltage in that part of the circuit was +3.3V it would be safer to use a tantalum capacitor with a voltage rating of 5V or even 6V rather than one that had a rating of 4V as this might be too close for comfort over a long period of time.

The more important criteria is the capacitance and the type of capacitor as these are the characteristics required when the circuit was designed.

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Hi @jayeff ,

As per Rev A schematic, the caps nearest to the cpu particularly the 330uF type are rated at 2V.

Fyi, i had ordered abt 20pcs 330uF 6.3V tantalum caps. After receiving and installing, hopefully the laptop will work normal again. I will report on this once everything is done.

Thank you for all the very helpful comments which i appreciated much.

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Michael Chu will be eternally grateful.
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