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#1 |
Quiet observer
Join Date: May 2010
City & State: Central Florida
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Posts: 88
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![]() Asking for schematic and/or boardview for APC BackUPS LS-500.
Board number: 640-0236J-13 |
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#2 |
Badcaps Veteran
Join Date: Jul 2011
City & State: Some times Sunny Jacksonville FL
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Line Voltage: 120 Volts 60 HZ
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![]() Can you please post some pictures of the board front and back so can read part numbers
We might be able help you fix it
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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 ![]() All of the mosfet that are taken out by bad caps ![]() |
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#3 |
Quiet observer
Join Date: May 2010
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![]() The pictures are below. I tried to get the best resolution I could.
From left to right.. #1. Top Left of the board #2. Top Right #3. Bottom side of #1 #4. Bottom side of #2 |
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#4 |
Quiet observer
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![]() Here is the problem I am working on with this UPS. Sometimes, only for a second or 2, the 'bad battery' light flash and it will beep. I have tried different batteries, and it still does it. I have tried a brand new battery, and it still does it. It may show the fault once every 5 minutes, sometimes more frequently, sometimes less frequently. It does this when something is plugged into it, and when nothing is plugged into it. When the UPS is running I am getting a good voltage at the battery, 13.69 volts. When the new battery is unplugged from the UPS, it reads 13.7 volts. The new battery has charged for 24 hours.
Thanks |
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#5 |
Badcaps Veteran
Join Date: Jul 2011
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![]() Will this battery backup work with a 100 watt incandescent light bulb load with no 110 line voltage hooked up
It should turn if you hold power on button for about 5 second or so ———> if not try this hook it up 110 volt line voltage then after it does it self check if has one then unplug it from the wall dose the light bulb stay light if not then you have a problem with the power switch over circuit Last edited by sam_sam_sam; 07-01-2020 at 04:02 AM.. |
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#6 |
Quiet observer
Join Date: May 2010
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![]() Yes, it works fine with a 100W light bulb running on the battery. I could see the light pulse just slightly, but it ran the bulb just fine. I ran it a few minutes.
Last edited by cook; 07-02-2020 at 07:06 AM.. Reason: Typo |
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#7 |
Badcaps Veteran
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![]() Okay
While you had the 100 watt bulb running on battery power did the low battery warning flash on or did even come on while you were doing this test Look at the fault light wiring and trace where it goes on the circuit board until you reach a ic chip or some type of device and look up the device to see what it does then see if there is a capacitor near that device that goes to that device and replace them if there is more one capacitor also trace the battery terminals back to some type of voltage monitor circuit on this board and if you find any capacitor replace them as well but before you buy anything mark where these capacitor are on the board Last edited by sam_sam_sam; 07-02-2020 at 03:56 PM.. |
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#8 |
Badcaps Veteran
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![]() How many Watts is your actual load that you were having problem with? Notes: I am not talking about the 100W bulb.
You can also add another 100W load to see what happen.
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Never stop learning Basic LCD TV and Monitor troubleshooting guides. http://www.badcaps.net/forum/showthr...956#post305956 Voltage Regulator (LDO) testing: http://www.badcaps.net/forum/showthr...999#post300999 Inverter testing using old CFL: http://www.badcaps.net/forum/showthr...er+testing+cfl Tear down pictures : Hit the ">" Show Albums and stories" on the left side http://s807.photobucket.com/user/budm/library/ TV Factory reset codes listing: http://www.badcaps.net/forum/showthread.php?t=24809 |
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#9 | |
Quiet observer
Join Date: May 2010
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![]() Quote:
I will get a list of the ICs on the board and post them in order to help me figure out what chip might be responsible for the 'Battery Replace' alarm. I will get that together later today. Knowing which chip might be responsible for that will give me 2 ways to track down the capacitors on the circuit -- tracing back from the LED and tracing from the IC. |
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#10 | |
Quiet observer
Join Date: May 2010
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![]() Quote:
I will find a more items to plug into it and run it to see if anything changes. I will run it plugged in to AC, and running on the battery. |
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#11 |
Quiet observer
Join Date: May 2010
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![]() Chips On The Board
APC BackUPS LS-500 / Model BP500UC / Board number: 640-0236J-13 Below are the ICs on the board. I looked up each one and I listed what I found about them. Which ones might be part of the circuit that triggers the 'Replace Battery' alert? I am thinking it is one or both of the 'LMxxx' chips maybe? --------- BIG CHIP The largest chip has a white APC sticker on top of it listing it is for a 350/500/700 unit, along with a version number. So I am not sure what that is. Maybe ROM? --------- 360-2040B UEWJ0414 What is this? --------- 93LC46B EEPROM --------- SN74HC595N 8-bit, serial in, parallel out shift register Is this for the USB connection? --------- LM393N Two independent voltage comparators --------- LM324AN Four independent operational amplifiers (op amp) --------- 4N25 Single channel phototransistor coupler --------- |
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#12 | |
Badcaps Veteran
Join Date: Jul 2011
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![]() Quote:
Last edited by sam_sam_sam; 07-03-2020 at 10:58 AM.. |
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#13 |
Badcaps Veteran
Join Date: Jul 2011
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![]() I was afraid of this that this might have been the case thanks for sharing this information
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#14 |
Quiet observer
Join Date: May 2010
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![]() I ran it connected to AC, running these lights: 40 watt incandescent, 60 watt incandescent, and a 150 watt halogen. The 'replace battery' LED came on briefly about 2 minutes into the test, then 5 minutes later, then 3 minutes later. Then I turned off the power to the AC, and it switched to battery. It runs fine on battery and the 'replace battery' LED does not go on. I ran it about 5 minutes like this and then stopped the test.
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#15 |
Leaking Member
Join Date: Dec 2014
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![]() Got across this schematic today while doing backups. Hope this helps.
BTW: on your second picture there are 2 relays and 2 brown capacitors. The top brown capacitor looks to me bad. Last edited by CapLeaker; 07-04-2020 at 01:24 PM.. |
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#16 | |
Quiet observer
Join Date: May 2010
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![]() Quote:
And thank you for noting that cap. I just looked closely at it, and it is has a slight depression across part of the top. It almost looks like something pushed into it because the metal on the top appears to have a small scratch or depression in the metal like something sharp pushed it in. It might even have a tiny hole in it, but I am not positive. I will certainly test that one further to see how it looks. It is a KMG Cap, ie. Nippon Chemi-Con |
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#17 |
Badcaps Veteran
Join Date: Jul 2011
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![]() The circuit diagram that you posted I only find one relay not two of them and I look for it for a while
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#18 |
Leaking Member
Join Date: Dec 2014
City & State: Atlantic Canada
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![]() 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. Last edited by CapLeaker; 07-04-2020 at 02:39 PM.. |
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#19 |
Badcaps Veteran
Join Date: Jul 2011
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#20 |
Quiet observer
Join Date: May 2010
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![]() sam_sam_sam,
I am currently identifying what capacitors are connected to the pins on the chips. Am I only interested in the caps that are first component I find on the trace, or should I be going further down the trace through a few components? Last edited by cook; 07-04-2020 at 07:50 PM.. Reason: Typeo |
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