Question about APC Back-UPS ES 725 Broadband (BE725BB-TU) UPS System

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Ups apc su3000rm3u resistor wrong

Hi, i have this ups apc su3000rm3u. is on and damage the r38 and r43 of 470 ohms, but working fine. what is the problem. thanks you.
gilbert.

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Well it could be your mosfet is leacking and some of the those traisitor is spoil check the black color of all the tranistor as well

Posted on Mar 24, 2009

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6ya6ya
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Posted on Jan 02, 2017

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It seems that Schneider / APC has a remedy for this on their forum:

http://forums.apc.com/message/35667

Reply or call if you need more assistance with this -- 407.380.9200

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That would be verry difficult to find. A service diagram of this model is imposible to be found, at least over the internet. However here are some tips you may find usefull. If you have acces to a multimeter or at least a current-voltage measuring device, try to turn on the laptop and measure the voltage on those pins where the resistor is missing. If you find something smaller then 10 volts you can try the following method.
Buy a 1 mega ohm resistor along with other smaller values like 100kilo ohm, 10kilo ohm, 1 kilo ohm, 100ohms, 10 ohms. These resistors don't need to be smd tipe, regular ones are good at least for this testing stage as long as you can solder them on the motherboard. Begin by using the larger values (1 mega ohm) and check to see if the problem is solved or something is different. Then decrease step by step checking each time how the problem evolves. When you reach to 1 kilo ohm, don't solder the resistence like before, instead mount an amper-meter in series (not parralel !!! ) with the resistor. Check to see how much current is passing through the resistor. If you find more then 100mA stop here, because by following this metod down to smaller values of that resistor you may damage the board if the current exceeds certain levels.
Try this simple tests and please notify my of the results. You may ask further questions if you need more details on this matter.

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