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Toshiba 55zv650u will not turn on

Capacitor on main board 1250uf 450 volt, looks to be bad

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That is an odd value! If it is swollen, replace it.

Posted on Oct 24, 2013


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I have a Samsung plasma tv Model PN50A550S1FXZA that starts up with clicking and popping sounds and all kinds of colors and shapes on the screen as it tries to warm up. is this a Y board issue?

Check the power supply, the high voltage circuit, which near where the plug-in from the 120 volts. There is a capacitor rated 450 volts at 100 uf (microfarad). (Could be more than one capacitors). The high voltage at the capacitor should be around 390 volts, anything less and you will need to replace this capacitor (or capacitors). Replace with a 300 uf at 400 to 450 volts. Got mine off some old power supplies.

Oct 31, 2017 | Samsung Televison & Video

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High voltage circuit is bad and usually is the capacitor that needs to be changed. Open up the back of the TV, and there are three boards. The one with the power cord is the power board/circuit. Change the capacitor - a 450 volt 100 uf. It should be at least 300 uf if not 400 uf at around 400 to 450 volts.. Samsung was trying to save money.

Oct 27, 2017 | Samsung Televison & Video

1 Answer

I have a vizio e65x c-2 , it shut off on me, and won't turn back on..... no lites @all. I would like to know how to test the power board to see if it needs replaced, or the logic board. Any help is...

First thing to do is see if the main fuse is blown, if it is then the power supply needs to be changed or the hot side of the board serviced. Use extreme caution if working on the hot side of the power supply board as there are DC voltages over 300 volts there...If the fuse is good check the 5 volt standby supply voltage, generally on Vizio its pin 1 but there will be a legend to tell what pin it is. if its around 5 volts its good, if not the power supply low side has issues, and sometimes this is bad capacitors. Next thing to check if you have 5 volts is the PS on terminal , find the correct pin get your meter on it and turn the set on, the 0 volts with the set off should go to about 3.5 volts, if it does then the main board is good and its a power supply issue, if you don't see about 3.5 volts then look at a bad main board, There is a fuse in the main board that can be tested but its rare its bad...Hope this helps some

Oct 16, 2017 | Vizio Televison & Video

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Sony Bravia KDL-xbr4 Replaced TCON board All worked great for a week Had an issue w/ HDMI cable at the box fixed it and now tv comes and the goes off to 6 blinking red lights

6 red flashes- backlight issue, bad main board, or power board or inverter boards- check standby volts on power board. "backlight on" volts should be 3-5v from main logic board then 24v to inverter

Have this from a youtube link find BUT
Better is to look first also on bad leaking or bulged capacitors thats better to replace in the bad components to get a repair because active components died on bad capacitors but after a while because on the build-in protection circuit by faults like deformed or leaking capacitors and even several fuse resistors then after replace a complete board again after a while you will may be get the same kind of problems again, take If you find some or much bad capacitors replacements 10 volts dc higher . begin with control on the power supply first of all.

Sony Bravia TV kdl red blinking led light error codes solutions Sony KDL 40XBR4 KDL 40XBR5 KDL 46XBR4 KDL 46XBR5 Service Manual

Jan 05, 2017 | Sony Televison & Video

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Can you fix a power supply on a Sanyo,no sound,no picture

Sanyo TVs usually only have two boards in them , doing a visual inspection of the power supply capacitors usually reveals swollen or bulging capacitors.
If the capacitors look good, voltage checks would be needed to isolate the problem to either the main board or power supply. Check for 5 volts to the IR board (& or keyboard) , if five volts is present suspect the main board

May 26, 2012 | Televison & Video

2 Answers

Toshiba crt tv wont turn on or off. red button keeps flashing and clicking

There are two possibilities for the fault symptom. The first one is, with a short ted component, Horizontal Output Transistor. This transistor can be located very near to LOT [Line Output Transformer] which in turn dirves the LOT. The second one is with LOT itself. Both are irreparable components, and replacing them with same type and number is the only work that can be done. OK.

Sep 26, 2011 | Toshiba 32A43 32" TV

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Sunsui tv model dftv270 turns off by itself how do i fix is

There are several versions of this model. They all have the same problem. The problem I'm speaking of , the location numbers of bad capacitors. So I will give you values and you will need to search and replace these. Find an ESR meter to locate bad capacitors. In the vertical deflection look for 50 volts at 4.7Mf, 35 volts at 100Mfs,50 volts and 25 volts at 1 Mfs. Be sure to resolder the vertical IC and don't solder the pins together. Find the smallest electrolytic caps valued at 50 volts 1 Mfs and replace these. These are scattered through out the main board. Other small caps include the 25 volt 10 Mfs, several of these as well. You also may want to inspect the capacitors near the flyback transformer and horizontal transistor and the horizontal output transistor. You will have to seek and find the weak or bad caps here. I will tell you, the shut down is mainly a capacitor issue. Caution is required when you remove these. The circuit traces in these TVs are very delicate and you can destroy this TV in seconds.Thanks for asking me and show all hands of support!

Jun 12, 2011 | Sansui 27" TV

1 Answer

My hd tv keeps turing off by itself how can i fix this problem

I have not repaired this model of TV. But I would certainly say you have a bad capacitor in the deflection area of the main board. If you have access to an ESR meter, you will find the culprit or culprits. I would look for a 160 volt to 200 volt capacitor with a value of 1Mf or 2.2Mf , 3.3 or 4.7Mfs.These are the majority of the capacitor values in nearly all brands that go bad. Check all the other capacitors you can, be on the look out for the 50 volt 1Mf and the 25 or 35 volt capacitors at 100 Mfs. Search, inspect and resolder any and all bad grounds. Include the vertical IC, horizontal transformer, flyback transformer and any regulating transistors mounted to heat sinks. Do not use too much solder, you do not want to short pins together. Thanks for asking and show all hands of support!

Jun 03, 2011 | Prima C2012 TV

1 Answer

Troubleshooting main board.

Three things to look for in service with LCD monitors,
1 bad capacitors
2 Bad transistors for the back light feeds
3 bad ic pulse chips for the Non function circuit
you will not find schematics unless you peruse the patent office records, reverse engineer the circuits and you will have a schematic
when the main chip fails on the vga board its time to buy a new vga video board,
sounds like your board may be suffering a bad IC telling the main chip the power is OK

let me know how it goes.

Dec 29, 2008 | HP w19 19" LCD Monitor

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