Question about Akai LCT2785TA 27 in. LCD Television

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Electrolytic Capacitors I need to put some new capacitors on my tv power supply board but what I read they must be same uf but any voltage higher then whats on there now.It also says capacitors must be electrolytic capacitors (+ -) .Is there a plus and a minus side on these capacitors and how will I no what is plus or minus on the old one and witch way it goes back on the board?

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The arrowed stripe indicates the polarity, wherein the arrows are pointing to the negative (-) pin

Posted on Oct 16, 2008

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Posted on Jan 02, 2017

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My 46'westinghouse led tv has no picture what can be wrong


If it's not a bad switch, then:
Many problems from later tv's come from bad capacitors. Even though you changed the power supply pcb there are several other capacitors on the other boards. Open it up and look for any caps with the top slightly swolen or leaking. They are inexpensive (as tou may know) to buy and a little bit of trouble to replace. If you can get at the terminal side of the bad cap, then you may be able to desolder it and then use a small drill bit to drill the holes back out, Solder in the new cap(s) and you're set.
p.s. Use capacitors with a higher voltage rating than the ones you take out, but the same uF.

Nov 10, 2017 | Televison & Video

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LG 42" PLASMA TV CLICKING WILL NOT TURN ON REPAIR


Hi

Ok everyone, this is a very common fault on this model of tv power supply, just keeps clicking on and off.
Your power supply board number should be.. 6709900019A

To resolve the issue we need to change some bad capacitors in the supply these are all the same value 3300uf / 10v

C227 / C201 / C202 / C203 / C281 / C282 / C283 / C271 / C272

All these need to be changed for the same uf but try and use a higher voltage, lets say 3300uf / 25v

Upon replacement your power supply will be like new and your tv will fire straight up.
Hope this helps a few people

on Apr 05, 2010 | Televison & Video

1 Answer

SAMSUNG TV UN65JU6700F RED LIGHT BLINKS 6 TIMES . TV DOES NOT COME ON AT ALL


My Samsung 50 inch had the same problem. Searched the web and it was the only capacitor in the power board that needed change, voltage was 382 volts. Replaced the old 100 uf 450 volts capacitors with two capacitors 150 uf 400 volts and 220 uf 400 volts in parallel and measured the high voltage at 390 and the TV was back to normal. (Make sure the capacitors from an old TV and computer power supply is rated for at least 400 volts.

Oct 27, 2017 | Samsung Televison & Video

2 Answers

I have my computer hooked up to my proscan 26LB30Q. The power will come on, but it only stays on for about 30 seconds. What do should I do to make it stay powered on?


How are you interfacing your computer to the tv? HDMI? RGB video cable?? Some tv's especially Vizio's will automatically turn off if it doesn't sense a video signal on the RGB input after about 30 seconds. Make sure your computer is putting out a video signal.

Sep 24, 2011 | Proscan 26LB30QD 26 in. LCD HDTV

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After off for a while, blue on indicator flashes for 12 times stops then flashes again. TV is Pioneer PDP-5070 Plasma TV.


Ur tv have a dying power supply board,that the board where the power a/c cord plug into.U have all the tools and know basic electronic also can do basic soldering work?Yes,take the tv aparts and check the tv power supply board carefully looking for dying capacitors components parts.These dying many capacitors components parts are alway bulges up or puffing up onto it tops.These capacitors parts are slowing leaking and dying to causes the tv to have a unstable managements of power voltages to tv to powering up the tv,unstable power supply board source that why the tv LED power light indicator are flashing.Replaced all these dying and leakages capacitors components parts are bulging ups or puffing ups onto it tops.Replaced all these dying capacitors parts with the same Micro Fared and but it voltages higer like 5 or 10 voltages higher than the old capacitors parts u are replacing.These higher 5 or 10 voltages on the new capacitors parts will help it to with stand heat better than those old capacitors parts u are replacing.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish tv power supply board for the replacement.

Aug 15, 2011 | Pioneer PDP-5070HD 50 in. Plasma...

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Tv won't come on is on stand by and there is a clicking sound as if it is trying to come on


Tv power supply board probally have dead components parts that are calling capacitors parts.That the board where the tv power a/c cord plug into it.U have all tools and understand basic electronic also can do basic soldering work too?Yes.Take the tv aparts and check the tv power supply board carefully for dying and leakage capacitors parts.These dying and leakages capacitors parts are alway bulges up or puffing up onto it tops.These dying and leakage capacitors bulges up must be replaced.Should replace those dying and leakage capacitors parts with the same Micro Fared and the those voltages higer rating like 5 or 10 voltages higher than the old capacitors parts was in the board.The higher rating 5 or 10 voltages on those new capacitors parts u put in the power supply boad will with stand heat better and last longer than those old capacitors components parts was in there.Or try website like Ebay.com to buy a whole refurbish power supply board for the replacement.

Aug 11, 2011 | Samsung HP-R5072 50 in. Plasma HDTV

1 Answer

My samsung ln52a650 blew a fuse during normal operation. one second it worked the next... nothing. popped her open and couldn't find any damage/arc/flash.... exploded parts. i hear this is a common...


U have all the tools and understanding basic electronic and also can do basic soldering?Yes.The tv power supply board,that the board,where the power a/c cord plug into it.Check the whole tv power supply board carefully for dying capacitors components parts.It is usally have bulges or puffing up capacitors parts indication of components capacitors parts are dying and needed replacement.Replacement for those new capacitors component parts with the same Micro ferit and the voltages of those new components capacitors parts in a higher voltages like 5 or 10 voltages higher than the old components capacitors parts u are replacing for a better heat resistance for the tv operation of the tv power supply board for later on tv use.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

May 08, 2011 | Samsung LN52A650A LCD TV

2 Answers

Can't turn on tv with remote or manually


Hello,

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.

I do not think it needs replacement, rather some defective capacitors are 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 "mcmelectronics.com"(look for electrolytic capacitors).
After replacing these capacitor(capacitors) most likely the normal operation will be restored.

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.

Mar 21, 2011 | Samsung LN19B360 19 in. TV

1 Answer

Suddenly, while watching TV, our TC-L42U25 Panasonic 42in HD 1080p screen turned off (image and sound) and now there's 3 steady blinks, a pause, then it repeats. When we disconnect plug, there's three...


The main board (Panasonic calls it the "A board") has detected a fault in the power to the LCD panel. Most likely the 12 Volt section of the power supply (P board) has failed, but the problem could be the main board or LCD panel. The troubleshooting procedure can be found in the technical manual for this series (link below).

There's a good chance the problem is burned-out electolytic capacitors on the power supply board; these are often identifiable visually. Good capacitors have a flat top, but burned-out units will have the top domed out by internal overpressure. See the photo for examples. The capacitor in front and the one to the right with the glue on it are good; the two marked capacitors are bad. You can unplug the TV and look at the power supply (board on the center left with a cable going to the power cord socket). (Do not touch the board for at least ten minutes after the TV is unplugged; the main input capacitor can retain a high voltage charge for some time.) If you remove the power supply for service, only handle it by the edges, and do not put it in or on a plastic bag unless you know the bag is anti-static. Static electricity can destroy the chips and transistors on the board, even small charges on your fingers that you don't feel.

Replace bad capacitors with capacitors having the same uF (micro-Farad) size, the same or higher voltage rating, the same or better temperature rating, and high ripple current and lifetime ratings. I strongly recommend using the Panasonic FR series capacitors for this application. If a higher voltage rated capacitor fits in the space (including vertical space), spend a few extra pennies on it because it will generally have a higher ripple current rating and longer life. Note: the polarity stripe on the new capacitor must go in the same way as the original; putting the capacitor in backwards will destroy it as soon as power comes on. Replacement requires electronic soldering skills for static-sensitive circuits.
Panasonic TC L42D2 Technical Manual Table Of Contents
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Nov 14, 2017 | Panasonic TCL42U25 42 in HD-Ready LCD TV

1 Answer

I have a Samsung LN-T5271FX/XAA LCD TV and have replaced the power supply board twice now and it needs it again as the TV clicks for a long time before powering up. At issue is the 10V IF Capacitors on the...


Not sure if this will help, but most caps fail with the in rush of power, over and over. Sounds like they were not made right. You might try a UPS ( uninterrupted Power Supply) this may help you with dirty power from your power company. And with high spikes. Make sure you get one that will handle the TV current draw. As far as upping the CAPs keep the same or slightly high voltage and increase in uf. You might find one that has the same uf and a higher voltage rating that will handle it.

Apr 05, 2017 | Samsung LN-T5271F 52 in. LCD Television

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