Biostar G31-M7 TE Ver6.0

[lucky13]

Hi Guys,

Got this motherboard for a possible recap. No bulging caps yet. However, this board will not POST once power off. You need to wait 1/2 a day or more with AC off. Already tried another P/S with similar result. Once working ,it will stay on 24/7. Reboot also works but just don't do a normal shutdown if you want to start it up again w/o the long wait.

I see there are 3x KZG 1500uF 16V at the VRM. I will replace these with HZ series.

There are 5 what appears to be poly caps with the marking Cs. Followed by UPS 820uF 2.5V. I've never see this brand before. Anyone know if these are really polys? If not, I can change them to Fujitsu polys I already got from BadCaps.

Also, can someone confirm if the other picture shows the 2 circled polys are Panasonic?

Thanks.

[c_hegge]

Re: Biostar G31-M7 TE Ver6.0

I see Chemi-con KZGs, which have to go, and Elite polymers, which I don't know much about. I'm not sure what those circled 680uF caps are, but I don't think they're pannies. It also looks like there are some OST caps. Those also have to go.

[lucky13]

Re: Biostar G31-M7 TE Ver6.0

Elite polymers? Thanks for the tip.

I've found a different post from 2 years back & Scenic provided a link to a Japenese site:

https://www.badcaps.net/forum/showth...241#post265241

I found the exact pix under the Elite brand. However, I can't find this series in the Chinsan site.

Anyway, my microESR meter says they have quite low combined ESR resistance (in circuit) and the total capacitance does come out ok. So I will leave these Elite alone and replace the KZG first to see if the boot-up issue is improved before upgrading the other caps.

[c_hegge]

Re: Biostar G31-M7 TE Ver6.0

An in-circuit ESR test means absolutely nothing. They have to be tested individually out of circuit.

[mockingbird]

Re: Biostar G31-M7 TE Ver6.0

Also, can someone confirm if the other picture shows the 2 circled polys are Panasonic?

Those are not Panasonic. I think those are Tecate... Tecate is very popular, and commonly found in laptops and OEM logic boards... I don't know much about them, or where there stuff comes from, the information is very sketchy but I think they're reliable.

As c_hegge said, those are Elite. Get rid of them. The only non-Japanese polymers which I trust are Samxon. Polymers absorb a lot of heat and are difficult to unsolder in my experience.

You would also do well for yourself to get rid of all the 8mm OST caps on the board. Especially the ones in the pi filter near the ATX connector and those near the memory slots...

[BigTroll]

Re: Biostar G31-M7 TE Ver6.0

sorry to revive a old thread i got one of these boards same version as above, and the caps near the psu connector OST RLG one bloated and leaked, they were 10v 1000uf and i read on the ost site they are general purpose, I had 2 1500uf 10v panasonic FLs lying around so i soldered them in, is using a low esr in place of a general purpose going to cause problems?

[mariushm]

Re: Biostar G31-M7 TE Ver6.0

I don't think RLG is general purpose. It's probably low esr series. The FL are good replacements either way.

[c_hegge]

Re: Biostar G31-M7 TE Ver6.0

Nope, RLG is a GP cap. I just confirmed that on the OST site. I agree, though that replacing them with low ESR parts is fine.