Possible Bad Caps

[krazykev64]

Hope someone can help me. i have been given a Gigabyte 8S661FXMP-RZ (Skt 478) which will not post. Not even the fan on the CPU will spin. the PSU is working. there are three makes of caps on the board
1/ RUBYCON (genuine spelling) with letter K on top
2/ OST with a CROSS on the top
3/ not sure of branding but there are some caps marked KZG with a THREE POINTED STAR on the top
the OST caps ar slightly bulged on the tops. the others look ok. none of the caps are showing signs of leakage. i have enclosed 2 pictures of the motherboard

[PCBONEZ]

Re: Possible Bad Caps

KZG are Chemicon.
That series of Chemicon doesn't like it where it's hot. [Next to CPU, video card, RAM.]
Will sometimes fail with no bloating.
Same with Chemicon KZJ series.
Same with OST. [Probably all series']
.
At a minimum replace all of whatever the bloaters are from 6mm/ up and 470uF/up.
.

[avoidz]

Re: Possible Bad Caps

I've just noticed some of the big green 'K' capacitors on the same board of mine are bulging/leaking, resulting in some random power problems (the display just goes off).

One directly below the CPU assembly next to the Northbridge; and between the CPU assembly and the RAM sockets.

I don't have the skill sets to replace these bad caps myself, so it's another mobo to the scrapheap.

[japlytic]

Re: Possible Bad Caps

The three-pointed star is Samyoung, a Nippon Chemi-Con ally.

[kc8adu]

Re: Possible Bad Caps

change the bulged ones and try it.
those are vrm input caps.16v

[c_hegge]

Re: Possible Bad Caps

The three-pointed star is Samyoung, a Nippon Chemi-Con ally.

If it has KZG written on it, it's chemi-con. Samyoung usually have their own branding on their caps.