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.

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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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Posted on Jan 02, 2017


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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.
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