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Old 07-04-2020, 06:51 PM   #21
cook
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Default Re: APC BackUPS LS-500 Schematics?

Quote:
Originally Posted by CapLeaker View Post
I know that this schematic I posted above isn't the exact match, but it should be good enough to give an idea what is going on.

For me, I'd ESR the sh*t out of them caps and replace them. I've had a run in with my small SMT a few years back, it turned itself off all the time.
https://www.badcaps.net/forum/showthread.php?t=66277

I'd change the two brown caps, the 2 black caps next to it and C51 and retest.
Got it, I will be replacing larger brown and black caps. I may do some more trouble shooting on the board first just to see if I can find other bad caps too.
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Old 07-05-2020, 10:09 AM   #22
CapLeaker
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Default Re: APC BackUPS LS-500 Schematics?

if you see a regulator, change the caps surrounding it too.
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Old 07-05-2020, 02:58 PM   #23
cook
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Default Re: APC BackUPS LS-500 Schematics?

Quote:
Originally Posted by CapLeaker View Post
if you see a regulator, change the caps surrounding it too.
I may need some help in identifying if the board has a regulator. Would that be one of the IC chips that I listed in an earlier post? Or is it something else on the board? I have pictures of the board in an earlier post.
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Old 07-05-2020, 05:45 PM   #24
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Default Re: APC BackUPS LS-500 Schematics?

I would definitely recommend doing the ones right next to these chip but ones you get working correctly I would highly recommend that you recap the hole board

As far as the regulator ic chip you would have to look up each part to what kind a chip it is
__________________
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *


These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board

All of these had CAPs POOF
All of the mosfet that are taken out by bad caps

Last edited by sam_sam_sam; 07-05-2020 at 05:47 PM..
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Old 07-09-2020, 05:22 AM   #25
cook
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Default Re: APC BackUPS LS-500 Schematics?

I found a regulator. It is a LM2575T. I will be tracing down the caps that are next to it.

It may be next week sometime before I have any results, but I will post what I find.
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