I have just repaired a 2007 HP desktop PC and ended up changing 12 pieces of CapXon 470uF/6.3V caps
These are notorious for leaking, some had and all had dodgy end seals but the interesting thing is that they all measured around 47uF+/- 20%, so I suspect there may be more serious fraud lurking here.
These are notorious for leaking, some had and all had dodgy end seals but the interesting thing is that they all measured around 47uF+/- 20%, so I suspect there may be more serious fraud lurking here.
A significant loss of capacitance would be typical of a bad capacitor, best to 'shotgun' the whole bunch with better quality high temperature/low ESR parts.
These were "105C" parts. I am suspicious that the ~12 I found and swapped were all between 34uF and 54uF. Some were in much worse physical state than others due to local environments on the motherboard.
In the past I have tested many burst ecaps of other types and found that they were still close to nominal value, but with raised ESR
The VGA ouput had always had some herring bone interference on dark images since I bought the machine at 3 years old. This is now gone
In the past I have tested many burst ecaps of other types and found that they were still close to nominal value, but with raised ESR
The VGA ouput had always had some herring bone interference on dark images since I bought the machine at 3 years old. This is now gone
The incorrect water based electrolyte formulation in the these Taiwan capacitors in notorious. The interesting thing to me is that these parts (physically small for the value) may well have been 47uF falsely marked as 470uF.
Opening a capacitor found a thick layer of paper before getting to a small wound foil core
This was a higher end HP desktop PC motherboard, probably made by Intel
Placement machines can check component values, but I don't think they would deal with 470uF
Opening a capacitor found a thick layer of paper before getting to a small wound foil core
This was a higher end HP desktop PC motherboard, probably made by Intel
Placement machines can check component values, but I don't think they would deal with 470uF
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