Replacement Capacitor Value for NEC Tokin OE687

[lazyboi11]

Good Day!
May I ask what is the correct replacement tantalum capacitor for NEC Tokin OE687? I have already replaced it with 4pcs 330uf 2.5v, it powers up ok but still it could not install windows...Laptop model is samsung RV511..
Thank you in advance...

[rievax_60]

Re: Replacement Capacitor Value for NEC Tokin OE687

Does it work better on battery power like the Toshiba laptops do? What are the full specs of the replacement capacitors. I think OE687 is 680uf.

[lazyboi11]

Re: Replacement Capacitor Value for NEC Tokin OE687

Haven't tried that since battery is no good and needs replacement. It's 330uf 2.5v, 6mOHM ESR, according to the seller and since I'm not well versed on deciphering tantalum capacitor number coding, I'm not sure if it is accurate. I will post actual parts number of the capacitor I used tomorrow..

Anyway, if its specs are correct, will it be functional? Or maybe some other issue(s) are present on that motherboard that needs to be resolved, but where? What components are involved?

I have a background in basic electronics but still novice in more complicated issues..

Thanks for the response..

[Th3_uN1Qu3]

Re: Replacement Capacitor Value for NEC Tokin OE687

The ESR is a bit too high, Tokin capacitors usually have around 1mOhm. Try with 6 of those caps you have and see if anything changes for the better.

[lazyboi11]

Re: Replacement Capacitor Value for NEC Tokin OE687

Thanks for the reply!
Can I use 220uF 2.5v? I have 4 pcs avilable which I have tried in this board previously...

Currently installed now is 330uf, 2.5v, will it work without issues?

[comptech83]

Re: Replacement Capacitor Value for NEC Tokin OE687

replace the 330d near the cpu

[piernov]

Re: Replacement Capacitor Value for NEC Tokin OE687

Replaced the NEC Tokin with 4*330uF tantalum (not the best I know but that's what I had laying around) and 2*220uF aluminium, and it works perfectly fine. No longer BSoD or freeze while installing Windows 10.

[ktmmotocross]

Re: Replacement Capacitor Value for NEC Tokin OE687

4x330 is enough if they have low esr

[piernov]

Re: Replacement Capacitor Value for NEC Tokin OE687

Picked them up from another laptop motherboard, they weren't on CPU VCore. Didn't know their specs so I went safe and put 2 other caps.

[sasser]

Re: Replacement Capacitor Value for NEC Tokin OE687

Did u solved the problem with the 4*330uf tantalum?

[sasser]

Re: Replacement Capacitor Value for NEC Tokin OE687

Lazyboi any help from u?

[sasser]

Re: Replacement Capacitor Value for NEC Tokin OE687

Anybody has solved this problem ?

[Th3_uN1Qu3]

Re: Replacement Capacitor Value for NEC Tokin OE687

4*330u tantalum for Toshiba, 4*470u tantalum or 6*330u tantalum for Acer.

[sasser]

Re: Replacement Capacitor Value for NEC Tokin OE687

How about for samsung rv411. There use oe687 too. Already put 330uf x4. But still cant install window

[Th3_uN1Qu3]

Re: Replacement Capacitor Value for NEC Tokin OE687

Try adding another 2x 330uF or replace 330uF with 470uF. But first, try another CPU, maybe CPU got damaged somehow (although unlikely).

I first experienced this problem with Acer 6930G, some other shop had installed 4x 330uF and it would still crash. I put in 2 more and worked fine. I have been doing those with 4x 470uF since. I have done two 6930G and one 8930G until now, no problem.