OST RLS what to replace with?

[Mad_Professor]

Got a motherboard here that doesn't turn on, when she told me she turned it off at the end of the night and it wouldn't turn on again in the morning, it sounded like a bad psu. But changing out the psu with a known working one, the board still doesn't turn on, at all, the fan doesn't spin or anything, just no life.

I suspect a shorted bad cap.

The board is littered with TK, OST and G-LUXON.

I ran across the board with my DMM and came across one which appears to be shorted .5 ohms on the 200 setting, I haven't confirmed it by taking it out to test again.

Anyways having trouble finding a replacement
I need two types.

1000uf 6.3v
ESR .72
Ripple 760
8x11mm or 12, I can go to 14

and

220uf 16v
ESR 0.13
Ripple 405
6x11mm

both are RLS and temps are 105 Celsius.

[mariushm]

Re: OST RLS what to replace with?

Are you really restricted in height? Seems strange to have this issue on a motherboard.

If you can go to 15mm high, you have some options:

http://search.digikey.com/us/en/prod...PD6-ND/2428118

Otherwise, if you really have height problems, you can probably go with polymer caps... and slightly lower capacitance values should work. For example:

http://search.digikey.com/us/en/prod...3-1-ND/2347911
http://search.digikey.com/us/en/prod...111-ND/1662497

If you really can't find one, I'd suggest to keep in mind that the tolerance for these capacitors is 20% so just maybe you could get by with a capacitor rated for a lower value.

For example, Panasonic FM/FR series are known to usually have slightly higher capacitance value than the one listed so maybe you can get by with a 820uF capacitor that if you're lucky, will probably give you 850-900uF in reality.

220uF:

http://search.digikey.com/us/en/prod...393-ND/2433527
http://search.digikey.com/us/en/prod...2920-ND/762830

[c_hegge]

Re: OST RLS what to replace with?

I'd be using https://www.badcaps.net/store/produc...roducts_id=131

That's the same height as the original

For the 220uF, https://www.badcaps.net/store/produc...roducts_id=112 would probably work

[Mad_Professor]

Re: OST RLS what to replace with?

Are you really restricted in height? Seems strange to have this issue on a motherboard.

If you can go to 15mm high, you have some options:

http://search.digikey.com/us/en/prod...PD6-ND/2428118

Otherwise, if you really have height problems, you can probably go with polymer caps... and slightly lower capacitance values should work. For example:

http://search.digikey.com/us/en/prod...3-1-ND/2347911
http://search.digikey.com/us/en/prod...111-ND/1662497

If you really can't find one, I'd suggest to keep in mind that the tolerance for these capacitors is 20% so just maybe you could get by with a capacitor rated for a lower value.

For example, Panasonic FM/FR series are known to usually have slightly higher capacitance value than the one listed so maybe you can get by with a 820uF capacitor that if you're lucky, will probably give you 850-900uF in reality.

220uF:

http://search.digikey.com/us/en/prod...393-ND/2433527
http://search.digikey.com/us/en/prod...2920-ND/762830

Well about 3 out of 8 is restricted due to PCI and PCI-e slots might cause clearance issues with video card and other add-ins.

I'd be using https://www.badcaps.net/store/produc...roducts_id=131

That's the same height as the original

For the 220uF, https://www.badcaps.net/store/produc...roducts_id=112 would probably work

I looked at HM, I feel that ESR is too low and might cause issues, but maybe my understanding of ESR is incorrect. Anyone want to confirm?

RS 220 cap's ripple is too low, ESR is double then what RLS.

[c_hegge]

Re: OST RLS what to replace with?

I've used them to replace RLS on motherboards lots of times and it's never been a problem.

You'll probably have to get the 220uF caps from digikey then. They would probably have the HMs as well.

[yyonline]

Re: OST RLS what to replace with?

I looked at HM, I feel that ESR is too low and might cause issues, but maybe my understanding of ESR is incorrect. Anyone want to confirm?

I've used HM-grade capacitors to replace RLS spec capacitors. I've never had any issues.

Use Panasonic FR or FM for the 220 uF.

[Mad_Professor]

Re: OST RLS what to replace with?

So much for recapping this board.

I got all the caps I need and today tried to recap this board and it's just a no-go.

I spent two hours trying to remove first cap, during that time I did my normal routine *tin the iron, apply solder to old solder, wiggle cap out.*

I broke the lead off, used two irons one 25w and one 40w, burned off the track but still tested ok I think.. can't tell. After an hour, I got it out. Got the new one in, solder it back. Went to the second one, it came out but I couldn't punch a hole with a pin through the back-filled hole. Change tips with a new one, that didn't work. Max my setting to 850F, that didn't work either. Check my iron with high temp thermometer it reads 900F at the tip, so iron tip is at max temp. Then tried a heat gun, pre-heat the board and kept trying, eventually I got the pin through but the hole was not big enough.

At this point I just said fuck it, not worth it.

Old solder has poor heat transfer or something, maybe it's not solder.

This is an HP board and putting in the board number RC415ST-HM brings up the HP specs but also ECS specs too.
Anyone know what ECS uses for solder?