Jump to content
Electronics-Lab.com Community

UPS Problem


Recommended Posts

Helow guys,

Well as a new guy here in office I don't have any knowledge in troubleshooting.... After the busted monitor, now my problem here is the APC ES 500 model BE500-PH. I can't find any schematic that could help me and APC refuse to give me one... My problem is this, my UPS wont start and I found out that one of the MOSFET (IRF740) is burned. I replaced it with a new one but the unit still wont power on. Hope you guys could help me troubleshoot. I have 3 more UPS, the same unit and similar problem, unit wont turn on.

I will really appreciate any help that will come. If you have question, don't hesitate to ask.  :)

Link to comment
Share on other sites

I see, the irf740 is in parallel with 3 irf740 also. I can see that it is found near the ceramic caps and the source. There are also some burned resistors and transistors near the mosfet but it is too small to determine, and I think they are defective too.

I would be glad to see you're APC 500 schematic and see if it matches on my unit here.

Thanks ante.


Link to comment
Share on other sites

hehe. Ante, I tried to check the UPS using you're diagram but it shows only little similarity on the pcb. The mosfets, resistors and caps are hard to find and not the same as irf740. My supervisor and I decided to indicate the problem and declares the unit defective and will be replaced... thanks ante...  ;)

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.