APC BackUPS LS-500 Schematics? - Page 2

cook · 07-04-2020, 06:51 PM

Quote:

Originally Posted by CapLeaker

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.

**CapLeaker** · 07-05-2020, 10:09 AM

if you see a regulator, change the caps surrounding it too.

cook · 07-05-2020, 02:58 PM

Quote:

Originally Posted by CapLeaker

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.

**sam_sam_sam** · 07-05-2020, 05:45 PM

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

cook · 07-09-2020, 05:22 AM

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.

cook · 09-03-2020, 02:17 PM

I finally replaced all ten of the various aluminum radial electrolytic capacitors on the board. The only ones that seemed out of spec. were the smallest ones - 22uF 16V ones, which were blue and made by JiangHai. There are 6 of these on the board. Some of them had very high ESR values. I have been running it for a few days now with the new caps and it is no longer beeping. So I am thinking that they were the cause of the intermittent beeping I experienced. Thank you to everyone who helped me with this fix.

**CapLeaker** · 09-04-2020, 03:57 PM

good to hear that you had success!

**sam_sam_sam** · 09-05-2020, 04:32 PM

I am glad you got it back up and running

On this voltage regulator what was on the next line was it a 5 or was it 12 this tell you what what voltage is
Now if it not have anything then it adjustable type

cook · 09-10-2020, 04:53 AM

Sorry Sam_sam_sam,
I don't know what was printed on the next line on the regulator. It is all back together now, and I can't see that part. And it is not easy to get it apart.

07-05-2020, 10:09 AM	#22
CapLeaker Leaking Member Join Date: Dec 2014 City & State: Atlantic Canada My Country: Canada Line Voltage: Ground, 0Hz I'm a: Hobbyist Tech Posts: 5,219	Re: APC BackUPS LS-500 Schematics? if you see a regulator, change the caps surrounding it too.

07-05-2020, 05:45 PM	#24
sam_sam_sam Badcaps Veteran Join Date: Jul 2011 City & State: Some times Sunny Jacksonville FL My Country: USA Line Voltage: 120 Volts 60 HZ I'm a: Knowledge Seeker Posts: 3,654	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 50F then at 90F 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..

07-09-2020, 05:22 AM	#25
cook Quiet observer Join Date: May 2010 City & State: Central Florida My Country: USA I'm a: Hobbyist Tech Posts: 88	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.

09-03-2020, 02:17 PM	#26
cook Quiet observer Join Date: May 2010 City & State: Central Florida My Country: USA I'm a: Hobbyist Tech Posts: 88	Re: APC BackUPS LS-500 Schematics? I finally replaced all ten of the various aluminum radial electrolytic capacitors on the board. The only ones that seemed out of spec. were the smallest ones - 22uF 16V ones, which were blue and made by JiangHai. There are 6 of these on the board. Some of them had very high ESR values. I have been running it for a few days now with the new caps and it is no longer beeping. So I am thinking that they were the cause of the intermittent beeping I experienced. Thank you to everyone who helped me with this fix.

09-04-2020, 03:57 PM	#27
CapLeaker Leaking Member Join Date: Dec 2014 City & State: Atlantic Canada My Country: Canada Line Voltage: Ground, 0Hz I'm a: Hobbyist Tech Posts: 5,219	Re: APC BackUPS LS-500 Schematics? good to hear that you had success!

09-05-2020, 04:32 PM	#28
sam_sam_sam Badcaps Veteran Join Date: Jul 2011 City & State: Some times Sunny Jacksonville FL My Country: USA Line Voltage: 120 Volts 60 HZ I'm a: Knowledge Seeker Posts: 3,654	Re: APC BackUPS LS-500 Schematics? I am glad you got it back up and running On this voltage regulator what was on the next line was it a 5 or was it 12 this tell you what what voltage is Now if it not have anything then it adjustable type Last edited by sam_sam_sam; 09-05-2020 at 04:40 PM..

09-10-2020, 04:53 AM	#29
cook Quiet observer Join Date: May 2010 City & State: Central Florida My Country: USA I'm a: Hobbyist Tech Posts: 88	Re: APC BackUPS LS-500 Schematics? Sorry Sam_sam_sam, I don't know what was printed on the next line on the regulator. It is all back together now, and I can't see that part. And it is not easy to get it apart.

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