Radeon 9800 Pro minus 1 cap

[alanarmstrong]

My graphics board suffered a little damage. Yellow Capacitor with a black edge was knocked off location C148 on the reverse of the board.

The text on the cap seems to say

106C
R4 1UN

although I am putting it under a microscope tomorrow to check the letters.

Can anyone shed any light on what it is in the way of farads, type voltage etc and for a bonus pint, a source in the UK.

Many thanks

Alan

[willawake]

Re: Radeon 9800 Pro minus 1 cap

your reading the wrong side

[alanarmstrong]

Re: Radeon 9800 Pro minus 1 cap

The other side has a slight ridge running width ways, so the profile is flat, raised, flat and unless the info is moulded into the cap I cannot see any writing, although I will check under the microscope later

alan

[willawake]

Re: Radeon 9800 Pro minus 1 cap



sorry, you must be talking about a tantalum

does it look damaged? why cant you solder it back on.

[alanarmstrong]

Re: Radeon 9800 Pro minus 1 cap

It is one of the smaller boxes you are pointing to.

It cannot be soldered on as the bit that broke off left its pins behind in the board and the edges are smooth, although you can see hints of metal along the middle of two edges.

[kc8adu]

Re: Radeon 9800 Pro minus 1 cap

its a 10 mfd tantalun.
most likely a low esr type.
16v should do.

[alanarmstrong]

Re: Radeon 9800 Pro minus 1 cap

Thanks for your identification but just so I get it right.

10 mfd is equal to 100 pico farad ?
low ESR = 0.1 ohms

do I need to worry about the level of DC leakage.

You can tell I am trying to match it up on a components web site

Alan

[gonzo0815]

Re: Radeon 9800 Pro minus 1 cap

10mfd=10uF=10000nF=1000000pF well may be i am wrong with the last number of zeros.
The reason those tiny tantalum capscitors is, to provide current very fast, untill the bigger al or soild polymer caps can provide the load. The larger the cap, the slower the risetime of the current, if the GFX chip requires it fast. That said, it is possible, that your card is running fine. But more realistic it will not running fine and my be some problems or noise occure. You can find those tatalums usually in every elektronic store. Or on older pc boards. If you can state your location in your profile, may be we can point you to an store in your country.

[davmax]

Re: Radeon 9800 Pro minus 1 cap

Microfarad = 10-6

Nanofarad =10-9

Picofarad = 10-12

1mfd = 1000nF = 1000000pF

[alanarmstrong]

Re: Radeon 9800 Pro minus 1 cap

Thanks for that, I am in the North East of England.

The closest spec I can find at the moment is

http://uk.farnell.com/jsp/endecaSear...sp?SKU=1190117

is this what I am looking for ?

The size is correct and the specs seem to match what people have told me on here, although its ESR value is 2.8R yet the one I have says R4, so I don't know if that means ESR value of 4.0R

or this

http://uk.farnell.com/jsp/endecaSear...jsp?SKU=498737

which is the same except the ESR is 100KHz (how does that relate to a resistance ESR)

Thanks for all the help so far.