Question about APC BE750G BackUPS ES 750 Battery Backup System TenOutlets 750 Volt Amps (1 Each) (UNAPWBE750G) UPS System

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How do I locate the proper faulty capacitor on the main board to fix the issue with the unit not charging?

I placed a meter on it and it's only reading 6.3 volts DC. Tried searching for a repair/service manual, but it's like they don't exist.

Posted by Steve Garry on

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theodore roberts

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Lawrence Oravetz is correct, however, a little more information: I have never found a capacitance checker that really works with in-circuit capacitors or that was accurate! We would have to pull on leg of each capacitor and test it. This has two problems 1.) the leg breaks off or 2.) the foil overheats. Proceed at your own risk. If you can get an oscilloscope on it you should find it! I love it that you're trying.

Posted on Apr 26, 2015

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Sami Sawda

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Why don't you check all FETs / IGBTs as well fuses on the charger side of the board.

Posted on Mar 12, 2015

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Lawrence Oravetz

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Electrolytic Capacitors puff up when they short. The top of the housing is no longer flat. It becomes domed. The plastic label may dis color and split. The rubber plug in the bottom of the capacitor can blow out and leak the innards out. Other types of capacitors cannot be easily checked with a volt meter unless you have a diagram with the voltage expected at that point is given.

Posted on Apr 26, 2015

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Wine noise only, no volume control


C7 and C15 capacitors bad, on main amp board, 470uf/25vdc, in +13vdc power supply circuit. BE SURE TO DISCHARGE MAIN LARGE CAPACITORS ON POWER SUPPLY BOARD AS THEY RUN AT + AND - 90VDC (180VDC TOTAL) AND STAY CHARGED LONG AFTER UNIT IS UNPLUGED!!! Shock hazard and may damage unit beyond repair if not discharged while desoldering components. Use around a 1000 ohm, 5 watt resistor across capacitor leads, if possible check voltage with meter to be sure they are discharged.

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Don`t charge the battery


Remove the battery, plug in the APC unit but do not turn it on. With a multimeter, place the leads on the proper connectors and turn on the meter and place it on the lowest DC setting to read DC voltage. The DC voltage should read 13.5 DC volts, which means the unit is capable of recharging the battery. If it reads low, for example, 6.44, then there's a problem. On the main board of the APC unit, it is more than likely a faulty capacitor.

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Sounds like you have a defetive main pcb. You might try a firmware update if there is one first.

Mar 19, 2013 | Samsung HL-S6188W 61" HDTV

1 Answer

Unit go off punch onn and off switch uitt come back on


Hello,
This issue is related to a power problem in as much as the TV turns off on it's own.
The problem is consistent with overheating on the power supply board of the TV. it might have worked fine in the past, but that's electronics for you. Power surge, irregular power supply, excess power supply, etc can affect the unit thereby making it to misbehave.
The power supply board of the TV has few capacitors and IC. If any of these IC's gets short or become weak, it can cause the TV to turn off on it's own.
When current passes from electric outlet to the power supply board of TV. The current also goes to the weak/faulty part, then the current stops or slow and the board overheats and TV shuts off on it's own.
To solve this issue, check the power supply board and read it with a meter and continuity tester, in order to detect the faulty part and replace the faulty part on the board which is short due to which power supply board
You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board from www/shopjimmy.com to save you some stress.
Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.
If you don't have the ability to read the fault, then you might be needing the help of a repairman or you can call a friend that has the ability to help you out.
I wish you the best of luck.
Regards.

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2 Answers

MY MICROWAVE SEEMS TO OPERATE FINE BUT DOES NOT HEAT . IS THIS AN EASY FIX OR DO I NEED TO FIND ANOTHER ONE?


Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean,solder and reset the board.Now identify the parts by clicking this link: http://www.espares.co.uk/advice/microwave/a/5/141/identifying-microwave-parts.html

If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off. Check the wave guide covers, if food had deposited
then it must be checked or replaced.

See link: http://www.espares.co.uk/advice/microwave/a/5/1146/how-to-replace-a-microwave-guide-cover.html

Now keeping clear of the microwave, switch on, use a cup of water inside to test.
If you notice any sparks shut off as the magnetron or the main HT capacitor can be faulty. replace with same type.
If there is heating without any issues, you can use the microwave safely

Thank You for using FIXYA.

Sep 13, 2011 | Maytag Microwave Ovens

1 Answer

The tv turns off by it self


Hi,
Your problem resides in two places, the A/V board and the main system control board assembly, as for the unit switching off and on this is an indication of a bad lamp, the unit has a lamp usuage timer that records the amount of time on the lamp, it needs replacing if it has been more or near two years as the lamp is only good for 6500 hrs of use, thats ruffly three years, The componet input not working is due to a bad switching IC on the A/V board, Replacing the Audio/Video board will solve the input problem. The A/v Board plugs into the main board assembly.

Apart from these the other possibilities are:-- 1)loose solder connections can cause short tracking. Get the board re-soldered to fix this issue. 2)faulty or bulged out capacitor causing short tracking.Get the faulty capacitor replaced to solve the problem. 3)the unit gets over heated internally and shuts itself.Keep distance between tv and wall and keep a desk fan behind the tv to keep it cool while you are using the tv and check. overheating can be because of internal fan problem.

Thank you!

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3 Answers

The audio on my Samsung HL-S6188W DLP TV is completely out--no sound from TV speakers in any input mode (ATSC built-in tuner, component-in, etc.). Furthermore, the optical-digital audio out does not...


Check your mute on /off status through your remote. If it is changing status & no sound,
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2 Answers

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1 Answer

Keeps turning itself off. Reckon its an overheating issue.


LCD TV turning itself off is not necessarily overheating.
Often, because of a faulty component, capacitors can accumulate electrostatic charge until an error is detected, or a fault condition can last for a while, until a problem is detected, and the protection circuit will force the TV to shutdown.
The only temp sensor that can shut down because of overheating is placed on the main board, and TV shutdown after a while is often not caused by overheating on LCDs.
Parts that often cause shutdown after a time are Power Supply Unit, Inverter, and main controller board. Parts must be tested to find the fault. The technician can follow the diagrams detailed on service manual to find the fault.
Regards.

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