Hi guys,
I have an IBM ThinkCentre in reasonable shape. The problem with it is that when Windows XP (or any other operating system i.e. Linux on a CD/DVD etc) starts to load, the system reboots.
You can sit around in the BIOS all day long and it will run just fine.
Issue is definitely down to the motherboard, troubleshooted all the other hardware i.e. checked that it wasn't a fan issue, replaced the PSU, checked the RAM, swapped the hard drive, reset the BIOS etc.
Desoldered a few large caps near the CPU and a couple of smaller ones, tested them with a Peak Electronics ESR meter, readings given as follows;
KZJ (ChemiCon) 16v 1800uF 105 deg C
1836uF 0.0 ohm ESR
1829uF 0.0 ohm ESR
1822uF 0.0 ohm ESR
1829uF 0.0 ohm ESR
Not sure what brand the smaller caps are, poss Sanyo?, not sure of value? possibly 820uF? markings printed on them as follows; 428 SEPC 820 2.5
872.5uF 0.0 ohm ESR
867.6uF 0.0 ohm ESR
Also checked all of these with my digital multimeter set to 2M ohms, each capacitor slowly charges until I get a reading of 0.0.
Cannot see any leaks, nothing really looks amiss but from what I have read on here the ChemiCon capacitors can go and still look OK.
Bad or not?
Thanks in advance, GJ.
I have an IBM ThinkCentre in reasonable shape. The problem with it is that when Windows XP (or any other operating system i.e. Linux on a CD/DVD etc) starts to load, the system reboots.
You can sit around in the BIOS all day long and it will run just fine.
Issue is definitely down to the motherboard, troubleshooted all the other hardware i.e. checked that it wasn't a fan issue, replaced the PSU, checked the RAM, swapped the hard drive, reset the BIOS etc.
Desoldered a few large caps near the CPU and a couple of smaller ones, tested them with a Peak Electronics ESR meter, readings given as follows;
KZJ (ChemiCon) 16v 1800uF 105 deg C
1836uF 0.0 ohm ESR
1829uF 0.0 ohm ESR
1822uF 0.0 ohm ESR
1829uF 0.0 ohm ESR
Not sure what brand the smaller caps are, poss Sanyo?, not sure of value? possibly 820uF? markings printed on them as follows; 428 SEPC 820 2.5
872.5uF 0.0 ohm ESR
867.6uF 0.0 ohm ESR
Also checked all of these with my digital multimeter set to 2M ohms, each capacitor slowly charges until I get a reading of 0.0.
Cannot see any leaks, nothing really looks amiss but from what I have read on here the ChemiCon capacitors can go and still look OK.
Bad or not?
Thanks in advance, GJ.
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