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Old 12-31-2010, 01:38 PM   #1
delaware74b
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Default Replacing Bad KZJ with Nich HZ

My friend dropped off her Dell XPS400 (Mid-ATX size, from 2005) complaining about a virus (I fixed it already) and running slow. One of the worst dusty computers I've worked on in a while. It's one of those LGA775 boards with the monster-sized heatpipe/radiator CPU cooler. I found 2 swollen 1800uF 6.3 volt 10x16mm KZJ caps next to the 4-pin 12v connector.

Question: according to the spec pages I found, the Nichicon HZ's 1800uF 6.3 volt 8x20mm seem be a good choice (as I have them on hand)?
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Old 01-01-2011, 11:53 PM   #2
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Default Re: Replacing Bad KZJ with Nich HZ

They will be fine. I've used HZ's in plenty, had no issues.
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Old 01-02-2011, 12:41 AM   #3
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Default Re: Replacing Bad KZJ with Nich HZ

I think HN is a better match to KZJ than HZ.
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Old 01-02-2011, 11:44 AM   #4
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Default Re: Replacing Bad KZJ with Nich HZ

Quote:
Originally Posted by mockingbird View Post
I think HN is a better match to KZJ than HZ.
Yes
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Old 01-02-2011, 03:57 PM   #5
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Default Re: Replacing Bad KZJ with Nich HZ

Or Samxon GC. 6.3V 3300uF GC are still in stock. This value is backordered at Mouser. Good to see Nichicon is still producing new batches for them though.
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Old 01-02-2011, 06:03 PM   #6
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Default Re: Replacing Bad KZJ with Nich HZ

The reason why I used the HZ is because I had them on hand and was an emergency repair to the hell mobo. I tested the ESR with my 'blue' and the KZJ's read 1.4 and 1.7. Actually, I watched the ESR rise from 0.8 to the higher levels as they cooled from being desoldered from the board.

The computer seems to be working well since the repairs......
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Old 01-02-2011, 08:43 PM   #7
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Default Re: Replacing Bad KZJ with Nich HZ

Is that a workstation board? The 12V connector seems to be in an odd place.
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Old 01-02-2011, 09:52 PM   #8
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Default Re: Replacing Bad KZJ with Nich HZ

Quote:
Originally Posted by mockingbird View Post
Is that a workstation board? The 12V connector seems to be in an odd place.
Looks like it's a BTX form factor board. That's a very common location for that connector on a BTX form board.
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Old 01-03-2011, 06:24 PM   #9
delaware74b
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Default Re: Replacing Bad KZJ with Nich HZ

The board is an odd layout and the case is backwards. It's a BTX board so the access panel is on the right side, expansion slots are on the right side when you open it. I thought this was just another way of Dell screwing up their computers.

The two caps I replaced are in the top left corner of the board - right up against the back of the floppy drive and NO airflow. The CPU cooler duct cuts off airflow in that area. The CPU fan and cooler have their own duct and opening in the front of the case (it looks like a handle in the front cover).

I can't take credit for it, but kudo's to the member who said Dell stands for Doesn't Ever Last Long!
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