This is the mobo that was dead and caused a PSU failure per
https://www.badcaps.net/forum/showthread.php?t=4483
I recently have built an ESR meter per
https://www.badcaps.net/forum/showthread.php?t=4476
I could do with a better pair of leads than those supplied.
The electrolytic BOM for this mobo details;
3 of Blue 1500 uF 16.0 V Rubycon MBZ 105 deg C - H 25.4 mm x Dia 10 mm EC2, EC20, EC21
2 of Blue 1800 uF 6.3 V Rubycon MBZ 105 deg C - H 25.4 mm x Dia 8 mm EC11, EC32
6 of Black 2200 uF 6.3 V Panasonic FJ 105 deg C - H 20.0 mm x Dia 10 mm EC5, EC6, EC10, EC12, EC13, EC14
12 of Black 1000 uF 6.3 V Panasonic FJZ 105 deg C - H 15.0 mm x Dia 8 mm
EC3, EC17, EC18, EC19, EC24. EC25, EC27, EC28, EC29, EC30, EC33, EC35
5 of Brown 1000 uF 10.0 V United Chemicon KZG 105 deg C - H 15.0 mm x Dia 8 mm EC22, EC36, EC41, EC44, EC45,
2 of Brown 470 uF 16.0 V United Chemicon KZG 105 deg C - H 11.5 mm x Dia 8 mm EC9, EC26
Note KZG are prone to failures per good cap list
2 of Black 330 uF 6.3 V Unknown 105 deg C - H 10.0 mm x Dia 8 mm
ESR values
Rubycon MBZ 1500 uF 16.0 V 105 deg C - H 25.4 mm x Dia 10 mm ESR @ 20 deg C - 13 milli ohms (0.013 Z) Max
Rubycon MBZ 1800 uF 6.3 V 105 deg C - H 25.4 mm x Dia 10 mm ESR @ 20 deg C - 19 milli ohms (0.019 Z) Max
Note on Rubycon MBZ Datasheet - no published can size at 25.4 x 10 1800 uF 6.3V - instead consider;
Rubycon MBZ 1800 uF 6.3 V 105 deg C - H 20.0 mm x Dia 8 mm ESR @ 20 deg C - 19 milli ohms (0.019 Z) Max
Panasonic FJ 2200 uF 6.3 V 105 deg C - H 20.0 mm x Dia 10 mm ESR @ 20 deg C - 13 milli ohms (0.013 Z) Max
United Chemicon KZG 5 1000 uF 10.0 V 105 deg C - H 15.0 mm x Dia 8 mm ESR @ 20 deg C - 28 milli ohms (0.028 Z) Max
United Chemicon KZG 5 470 uF 16.0 V 105 deg C - H 11.5 mm x Dia 8 mm ESR @ 20 deg C - 36 milli ohms (0.036 Z) Max
First, I tested all electrolytic caps valued at 470uF and above.
This mobo only has wet caps of the values that concern me.
All of the caps exhibit an ESR of between 0.17 and 0.20 but this
value is of an order of ten at least, greater than the published ESR.
I suspect this may be due to the precision of the meter.
Q - can I take it as read - there are no immediate concerns as to ESR breakdown?
Would a next plausible debug step be to put the ESR meter in parallel
with my multimeter, with the meter set to a range of 200R?
Would this eliminate any caps that have gone s/c and not due to an ESR issue?
This would require the cap under test to be taken out of cct of course, correct?
Any other suggestions what I should be looking for?
Any help, insight and advice greatly appreciated
https://www.badcaps.net/forum/showthread.php?t=4483
I recently have built an ESR meter per
https://www.badcaps.net/forum/showthread.php?t=4476
I could do with a better pair of leads than those supplied.
The electrolytic BOM for this mobo details;
3 of Blue 1500 uF 16.0 V Rubycon MBZ 105 deg C - H 25.4 mm x Dia 10 mm EC2, EC20, EC21
2 of Blue 1800 uF 6.3 V Rubycon MBZ 105 deg C - H 25.4 mm x Dia 8 mm EC11, EC32
6 of Black 2200 uF 6.3 V Panasonic FJ 105 deg C - H 20.0 mm x Dia 10 mm EC5, EC6, EC10, EC12, EC13, EC14
12 of Black 1000 uF 6.3 V Panasonic FJZ 105 deg C - H 15.0 mm x Dia 8 mm
EC3, EC17, EC18, EC19, EC24. EC25, EC27, EC28, EC29, EC30, EC33, EC35
5 of Brown 1000 uF 10.0 V United Chemicon KZG 105 deg C - H 15.0 mm x Dia 8 mm EC22, EC36, EC41, EC44, EC45,
2 of Brown 470 uF 16.0 V United Chemicon KZG 105 deg C - H 11.5 mm x Dia 8 mm EC9, EC26
Note KZG are prone to failures per good cap list
2 of Black 330 uF 6.3 V Unknown 105 deg C - H 10.0 mm x Dia 8 mm
ESR values
Rubycon MBZ 1500 uF 16.0 V 105 deg C - H 25.4 mm x Dia 10 mm ESR @ 20 deg C - 13 milli ohms (0.013 Z) Max
Rubycon MBZ 1800 uF 6.3 V 105 deg C - H 25.4 mm x Dia 10 mm ESR @ 20 deg C - 19 milli ohms (0.019 Z) Max
Note on Rubycon MBZ Datasheet - no published can size at 25.4 x 10 1800 uF 6.3V - instead consider;
Rubycon MBZ 1800 uF 6.3 V 105 deg C - H 20.0 mm x Dia 8 mm ESR @ 20 deg C - 19 milli ohms (0.019 Z) Max
Panasonic FJ 2200 uF 6.3 V 105 deg C - H 20.0 mm x Dia 10 mm ESR @ 20 deg C - 13 milli ohms (0.013 Z) Max
United Chemicon KZG 5 1000 uF 10.0 V 105 deg C - H 15.0 mm x Dia 8 mm ESR @ 20 deg C - 28 milli ohms (0.028 Z) Max
United Chemicon KZG 5 470 uF 16.0 V 105 deg C - H 11.5 mm x Dia 8 mm ESR @ 20 deg C - 36 milli ohms (0.036 Z) Max
First, I tested all electrolytic caps valued at 470uF and above.
This mobo only has wet caps of the values that concern me.
All of the caps exhibit an ESR of between 0.17 and 0.20 but this
value is of an order of ten at least, greater than the published ESR.
I suspect this may be due to the precision of the meter.
Q - can I take it as read - there are no immediate concerns as to ESR breakdown?
Would a next plausible debug step be to put the ESR meter in parallel
with my multimeter, with the meter set to a range of 200R?
Would this eliminate any caps that have gone s/c and not due to an ESR issue?
This would require the cap under test to be taken out of cct of course, correct?
Any other suggestions what I should be looking for?
Any help, insight and advice greatly appreciated
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