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Which power supply caps to replace?

Which caps should I replace? One is obvious, but there are some others that don't appear damaged other than some blue coloring on the top. Pictures below.

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I would suggest to use PANASONIC FM or FC series from DIGIKEY, they have low ESR, high ripple current capability, 105c rating. You should replace then as set per suggestion above.

Posted on May 14, 2010

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Redhorizon77, Electrolytic filter capacitors are relatively cheap. I would at least replace ALL filter caps that have the same capacitor manufacturer name that is printed on the heat-shrink "tube" label. Look for names like: "CAPXON" SAMXON" "JUN FU" "ELITE" Then tell us what you find installed on your SMPS board. Please pay attention to polarity when replacing them. The wire lead closest to the white stripe on label is the negative lead. Make sure to mark the board with fine point marker where the negative lead goes!! And take close-up photos (2 to 3 inches) of board and capacitors BEFORE removing them. Solder some half-inch leads onto the bad and suspected bad caps and ask the local tv/monitor tech to measure the capacitance value (UF) microfarad and report back the data here on fixya. Also tell us brand of filter caps you installed. 12fixlouie

Posted on May 12, 2010

  • Louis Ebert May 12, 2010

    redhorizon77, I looked at your pic's and can see you will need to replace a whole lot of CAPXON caps. I wouldn't trust them as far as I could throw a 1 ton wrecking ball. Replace with 105 deg C rated caps. Not 85 deg C !!! The caps I have I measured on a Stanford Research Systems SRS720 LCR meter. A Capxon 2200uf 10v read 10.8uf , 2200uf 16v read 119uf and three more were just as bad!!! 12fixlouie



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LG 42PJ350 tv, will not power up, just clicks


The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board. You might be lucky it's just a blow fuse. Also a defective transformer can cause your TV not to power on.

All these can be checked on the power supply board.

But more often bad capacitors causes problem on the power supply board. I do not think the power board needs replacement, rather those defective capacitors is causing this issue. Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like ""(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 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 know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

I hope this helps.

Good luck.

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Before you go out and buy a whole bunch of new electrolytic capacitors (available from most electronics stores including Radio Shack etc), take a visual look at the power supply (unplug unit from power point, and carefully remove the power board.) Examine it carefully, and note each capacitor that you can the value/voltage of - write it down, and obtain the closest replacements of each. Don't panic if you can't get a 20V 680µF, use a 25V 1000µF instead.

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