20 Most Recent Samsung HP-T4254 42 in. Plasma Television - Page 4 Questions & Answers

When the menu starts rolling, take the remote out of the room to see if it's the remote causing the problem.

if it's not, check for bad capacitors on the boards.

There's a good chance you have failing electrolytic capacitors either in the power section or the inverter section or both.
Any caps in these sections that look bulged at the top, or bulged/leaking at the bottom need to be replaced.

If you are handy with a soldering iron and can identify the bulging or leaking capacitors, an inexpensive handful of capacitors will likely fix you right up.
Match the capacitance on the capacitors. Go over voltage if you can, and still have them fit.
IE - it's not a bad idea to replace a 10V cap with a 16V or 25V or even a 50V, but don't replace a 680uF cap with a 500uF or a 1000uF (unless you are positive it's only doing ripple filtering, and even then, you should go OVER, not under the uF rating).

Most of the caps that go are 10V 1000uF or 3300uF.

I found some great videos of the procedure (for many Samsungs with the same issue) on youtube.
http://www.youtube.com/watch?v=Mm51C_RDIZE
http://www.youtube.com/watch?v=BNHHrgX_6cs&feature=related
http://www.youtube.com/watch?v=8l0AUj8QUkg&NR=1&feature=fvwp
http://www.youtube.com/watch?v=Y7b_nTaZYcU&feature=related

As you can see, this issue spans plasma TVs, as well as large and small LCD TVs and monitors.
The parts are cheap, and skill required is minimal.

Take the tv back cover aparts.Check the power supply board,that the board where the power a/c cord plug into it.U have tools like a soldering iron and a desoldering pump or a roll of desoldering braid and can do basic soldering and understanding electronic?Yes.Check the power supply for dying capacitors,will have bulging or puffing up on it tops.By replacing all these dying capacitors,will solved this problems.Or try website like Ebay.com to buy a whole refurbish power supply board for the replacement.

make shure that the computer is set up to display on the screen. To check and see right click on your desktop, click on the option that says screen resolution, and then change your settings from their. The tv will not register that you have a computer plugged into it if the computer is not sending the tv a signal.

There's a couple transistors on the Power Supply board that are probably bad. On mine, the solder joint was bad on the bottom side of the board that pointed me at those transistors in particular. Part number is FQPF9N50C. Also, you could get a refurb or new power supply board of ebay or send your board in for service (also on ebay).Or there's a "repair kit" you can get that contains 4 transistors and a couple caps I think. If you are an electronics junky and like soldering stuff, that would be the way to go... I just ordered the two transistors off ebay for like $6.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320632712822
http://cgi.ebay.com/Samsung-HP-T4254-Internal-Replacement-Circuit-Board-/230575679230?pt=LH_DefaultDomain_0&hash=item35af61a6fe
http://cgi.ebay.com/REBUILD-YOUR-SAMSUNG-BN44-00161A-Power-Supply-/200513469692?pt=LH_DefaultDomain_0&hash=item2eaf88bcfc

Hi, Ashley. I hope I can help you out today.

What it sounds like is happening, is that one or more of your capacitors has failed, so the remaining ones are trying to compensate and still function properly, thats why it is slow to start up.
Capacitors are like little booster batteries that get the tv a kick start to get it going.
Well, unfortunately they burn out sometimes, and when they do, they cause this exact kind of sluggish response to powering on the tv. It takes that many tries because your not getting a full boost all at once. The capacitors look like little cans, or batteries almost, standing up and down.
The damaged ones will either look like a leaky battery, or be split down the side, or have the top bulged up, or some even pop like a little balloon. They will leave a wet residue on the circuit board as well.
Although they "can" be fixed as a do-it-yourself project, I would suggest that you take it to your local Fry's or BestBuy. They both have specially trained techs for this specific repair.
Also, know that depending on how many capacitors are shot, and how much labor will be involved in the repairs, it may cost as much for a new tv as it is to fix the old one.

maybe the video output is too high

Do you have sound? Is the panel primed (turns the lights off and is the panel glowing? Have you check the voltages on the power supply?

Are the bright flecks of red color where it is supposed to be black? That could the one of the sustain boards going out also could cause the horizontal lines too depending on the board - worst case scenario - would be a bad ribbon cable on the panel itself - best case scenario - plug the tv in to an outlet that is by itself to isolate interference as a possibility.

Thanks,
phatcav

The back light needs to be replaced.

It may be detecting shorted circuits so it goes into shutdown/restart mode, or it may have failed power supply.
Please download any one of the PLASMA TV training guide to get some understanding how PLASMA TV works to guide you on troubleshooting.
Basic LCD monitor and TV troubleshooting guide: http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting http://www.fixya.com/support/r7406380-tv_training_manuals Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague Parts: www.shopjimmy.com Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps. Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series. Please leave rating if it helps.

Capacitors are only one problems,viewing capacitors inspections are best and easiest ways.U want to test it with a multi Voltmeter look for capacitors Microferet and voltges each one,just test it.U have no skills or trouble shooting experience in electronics devices.Well no amount testing of capacitors,will not solved the tv problems,could be any things in the power supply board is slicely variable voltages could cause power problems.Try website like Ebay.com to buy a whole refurbish power supply board for the replacement.

not sure but call sears they charge $99 to come out and free estimate

Do you get sound for a while?

Thanks,

Replace your power supply. You can tried this two stores www.orlandolcd.com or www.shopjimmy.com Make sure you have the right number.

Thanks

Pull the back off and check the power supply for bulged electrolytic capacitors.

hi,
you can try using a good quality surge strip on the tv. if that doesent do it you could try a different outlet on the other side of the room, or try using an outlet from a different room(long extension cord) if that doesent do it you may have to move the tv to another wall.
jm

How good are you with a soldering iron? This problem on this TV is usually the faulty connections on the SMPS. Most likely all the parts on the board are good but sometimes ICQ805 is also faulty(most likely it is just the solder connections). You can try heating one area of the board at a time with a hair dryer and see if it stays on for longer. Sometimes you have to heat then freeze to prove the malfunction. IMPORTANT: If you are not good with a soldering iron or don't have a steady hand, LET A PROFESSIONAL DO THE REPAIR. The SMPS is a very delicate circuit and can be easily damaged. If you do this repair incorrectly you will be forced to replace the whole board.
Joe

hi all .ive had the same problem,a thick black line down screen.sometimes it flickers from top to bottom and other permantly in view.but i have solved it.forget your ic boards and taking apart tv.have you got either a ps3 or wii connected to tv.if so unplug power lead from socket and relocate in seperate socket.make sure the lead is completely free of any other leads and you might just find this works.i think the power lead creates some sort of frequency that the tv picks up .good luck hope it works

Ten months only tv,ur tv still under warrenty,call Samsung wright away.Take ur manufacture warrenty repair.The tv main Tuner signal board is developing a problems.