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SUGGEST: Missing Caps in a Biostar M5VNB Socket 7 motherboard

ayandon

Member
Joined
Aug 10, 2022
Messages
41
Location
Kolkata, India
Hello Friends,

Yesterday, I found this Biostar M5VNB Socket 7 motherboard from a dealer.
This one - https://theretroweb.com/motherboards/s/biostar-m5vnb

But, in my un-experienced eyes, I can guess that these few Caps are missing! Because they have marks on the PCB.
  • I have marked the missing Caps as YELLOW. (Right-Top most Cap size is smaller)
  • RED marked Cap which is very near to the missing Caps is of 1200uF 6.3V.
  • GREEN marked Caps are of 1000uF 6.3V.
index.php


Pls suggest -
  • What Caps should I put there? (Right-Top most Cap size is smaller)
  • DO you find any other issue or missing components in the board?
I can't find any reference picture in the Internet :(


P.S. I checked the motherboard and there seems to be no short issue.
 

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booboo

Experienced Member
Joined
Sep 13, 2009
Messages
172
Location
Dallas, Texas, USA
Did you melt the AT power connector (upper left of picture, on right side of connector)? or did someone else? Seems like this poor motherboards has had some difficult life. if you didn't touch the regulators in that region, all this may point to someone that tried to fix and failed on this board.
 

ayandon

Member
Joined
Aug 10, 2022
Messages
41
Location
Kolkata, India
Did you melt the AT power connector (upper left of picture, on right side of connector)? or did someone else? Seems like this poor motherboards has had some difficult life. if you didn't touch the regulators in that region, all this may point to someone that tried to fix and failed on this board.
I did nothing.... just IPA cleaning....
 

andy

Experienced Member
Joined
Oct 22, 2008
Messages
238
Location
Austin, TX
Any caps that are connected in parallel are probably the same value, so that might ID some of them. For ones where you have no idea, you could temporarily install 16v caps in the 1000-2200uF range. The value is probably not that critical, and this will let you see if the board can be saved. If you get it to work, you can then measure the actual voltage on the caps to get more of an idea of what should be there based on the voltage, and PCB footprint.
 

hmb

Experienced Member
Joined
Aug 8, 2019
Messages
286
Did you melt the AT power connector (upper left of picture, on right side of connector)? or did someone else? Seems like this poor motherboards has had some difficult life. if you didn't touch the regulators in that region, all this may point to someone that tried to fix and failed on this board.
Agreed - it looks like something bad has happened to this board. One edge of that power connector is partially melted. The board and SMD components adjacent to that area look scorched. Several of the solder pads where the missing capacitors were located look scorched and/or badly damaged, either from whatever originally caused a short-circuit failure on the board's power supply bus and/or when the previous owner removed what were likely several obviously damaged caps.
 
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ayandon

Member
Joined
Aug 10, 2022
Messages
41
Location
Kolkata, India
Agreed - it looks like something bad has happened to this board, which someone tried to fix starting with removal of several capacitors. One edge of that power connector is partially melted. The board and SMD components adjacent to that area look scorched. Several of the solder pads where the missing capacitors were located look scorched and/or badly damaged, either from whatever originally caused a short-circuit failure on the board's power supply bus and/or the previous owner's careless attempt to fix it.

may be it was a donor board.... God knows.
Wish I can find a pic of the same motherboard to compare....

The only pic -
M5VNB.jpg
 
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