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V4-4500 PCI - #0000 - United Kingdom - DAC problem - 5/20

 
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osckhar
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Joined: 21 Jan 2004
Posts: 1007
Location: Spain

PostPosted: Fri Jul 24, 2020 16:10    Post subject: V4-4500 PCI - #0000 - United Kingdom - DAC problem - 5/20 Reply with quote

Hello,

Today I received a VOODOO4 4500 PCI from UK with problems on the DAC, colors showed are not correct.




Once tested DAC to VGA is correct, is turn of a BGA rework but what surprise I found once I take out the VSA100. Yes, many PADS from DAC zone chip was broken... Sad




Why there are BGA pads broken?

People try to reemplace original heatsink for new ones. Process is not difficult but if you do it bad when trying to take out heatsink, you can broken PADS. I have seen many dead V4/V5 for this reason. Be ware taking out HeatSink - many people break pads doing it -

This time I have been to able to fix it, but not always it will be possible- it depends from BGA pad zone - I had to rebuild pads and even do a pair of bridge connections with tiny copper wire soldered onto VSA100 chip.







Not always is possible but this time the BGA bridge reworks worked perfectly and now V4 4500 PCI works perfect with correct DAC colors. Yeahhhhh!!! Long life to 3Dfx!




Regards,
Oscar.
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