Question about Zenith 12vDC 800mA 20W AC Adaptor A41208 (1500850) Power Supply

1 Answer

Zenith TV power goes off

My tv seems to go blank when it gets warmed up.Sometimes it won't even come on. If I unplug it for a few minutes and then replug it in, it might come on for a short time, but then back it goes. Can you tell me how I can repair this myself? Thank you

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Master
  • 6,966 Answers

Hi, From what you have posted 2 possible things: 1. Cold solder - this proble is common in the power supply, vertical and horizantal circuitry. Look for any dull colored solder joints special in power components like high wattage resistor, regulator or output ICs or transistors; this problem also becomes apparent when the unit is jarred; and/or 2. Component heating up and failing - more often than not it is an active component like a power transistor or power IC that starts to fail when running after sometime (due to heat buildup) again anywhere the power, vertical, horizontal section. You would need an aeresol spray of contact cleaner to spray on the suspected component to lower its temperature when the TV starts to fail. You need to be familiar with soldering, use of a VOM, circuit analysis and component level repair to properly fix the problem. Further there are dangerous high voltages inside a TV unit even with the power off. Likewise, the unit has to be diagnosed, run, repaired and tested with the back cover off. With these in mind, you might be better off seeking the services of a qualified TV technician. Hope this gives you an idea of the problem. Pls post again how things work up your end. Good luck and kind regards.

Posted on Aug 06, 2007


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Samsung LN 32C 530F1F keeps powering off randomly

probably overheating. hoover out the vents and make sure plenty of air can circulate. a case of suck it and see. lol

May 24, 2017 | Zenith Televison & Video

1 Answer

The TV seems to take ages to turn on, the red on/off light flashes and then goes off completely and the screen stays blank. It then switches on again and after a few seconds/minutes will switch back off....


This is an indication of out-of-regulation in the power supply section. The very common caused of this fault is the leaky electrolytic capacitor in that section. It will drop the supply from normal voltage and will disable the unit.It needs a little warm-up to make itself stable but the symptom will get worst. Sometimes it has a bulged/dome at the top but not all, it is better that you have a capacitor checker/tester to determine its condition. Your unit will back to normal again if the leaky capacitor is isolated. Yes fixing the power supply is quite technical but in this case a little backround in electronics will be fine because electrolytic capacitor is the only parts that are going to be replace. If you don

Mar 06, 2011 | Samsung LE32A457 32 in. LCD TV

1 Answer

Zenith IQB32B42W 32" TV works sometimes but looses picture. Top half of picture goes blank (dark) and the bottom half scrambles into horizontal lines. I hear a pop or click right before this happens. The...

Capacitors can be deformed or some solderings on active components can be bad.
Amplitude change and image geometry want change when warming up, buy a canister cold spray and spray some components, Be careful when working at high voltages in the fly-back (horizontal) circuit by crt television, and tripler and Focusing voltage.

Aug 11, 2017 | Zenith IQB32B42W 32" TV

2 Answers

Syntax Olevia flat screen tv video goes off then on

Hi, Replace the bulging capasitors on the main power supply board. Thanks.

Sep 22, 2009 | Insignia 37" LCD Flat-Panel HDTV

1 Answer

Zenith 27" TV

I sorry to say I think you have a component failing that is related to heat. 15 years is a long time and if the TV was used in hpot conditions over the years it may well be the proble, or it's just old.

Sep 23, 2008 | Zenith C27A24T 27" TV

1 Answer

Tv goes blank

The effect you described sounds a lot like a failed solder joint.

There are points on the circuit board that are subjected to heating and cooling each time the set is powered up, then down.
The solder joints near these areas can fail from metal fatigue as will any metal that is forced to expand and contract repeatedly.
These fractures are minute and can often only be seen under magnification.
Once found, they are simple to fix; removal of the old solder and resoldering will restore electrical contact in seconds.

If you can find a gray-haired tech nearby who is retired, maybe early since repair is a business stagnated by cheap labor in Asia, he/she will know where these areas are and can robably get rid of your lottery-like operation.
Or, if you have way too much time on your hands and are willing to buy a decent soldering iron and dig into the guts of your set, you can probably find the problem yourself.

While semiconductors do fail (sometimes for the same reason), since the set does sometimes restore itself, it isn't likely that any of those has died.

I would be torn to toss the set if it is otherwise OK for the simple reason that if repaired, it may outlast 80% of those bought in the last 2 years.
It is amazing the number of problems that are happening on new, sophisticated sets and it is traceable to lousy quality in parts and assembly.
I have one LCD set I will probably junk this year that is only 2 years old, flawed when I bought it new, and has a failure producing a vertical black stripe that would require replacment of the $4-500 panel.
Junk - Specifically, WALMART junk.

Jul 12, 2008 | Zenith B32A24Z 32" TV

1 Answer

Sharp Aquos LC-32D4OU

Comment by Guest, posted on Oct 25, 2008My Aquos has the same problem. I'm not sure how I discovered this, but when I lean the TV forward and hit the power button it will turn on every time. If the screen blacks out and I don't lean it forward when I hit the power button, the screen will just remain blank. It is very weird, but at least repeatable.

- Thank you, Guest. That did it. It definitely seems to be a problem with the TV. Tilting it and hitting the power button helped me get the video back.

Jun 05, 2008 | Sharp Aquos LC-32D40U Television

1 Answer

Zenith 27inch B28A11Z keeps powering itself off

Hi Pswglaw,

From the way you describe the problem, it seems you have a high voltage leak. To check this, make the room dark and look into the back of the TV while turning it on. If you see something like lighting jumping around you have this high voltage problem. The TV will eventually destroy itself under this condition. I would suggest not using it until you get it repaired. The repair cost will be much lower if the TV is still working when you take it in. The high voltage leak will destroy more parts and cause the TV to stop working. Then it will blow a fuse.


Jan 23, 2008 | Zenith B27A11Z 27" TV

1 Answer

Tv does not turn on

When TV does not start, and sometimes you hear a clicking noise, that means that the TV is on protect mode.

Try first leaving the TV power cord unplugged for some times, let say one hour or so.

Also ensure that the fault is not coming from a faulty receiver box sending bad signal, check if you get same problem with no receiver box or dvd connected.

If that does not work, and you keep having a flashing led on front of the TV, and tv turning off by itself after a while, that indicates a fault condition.

The flashing light indicates a diagnostic state called protection.
When the TV goes on protection there are only two possible reasons.

1The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or abroken contact, identified an internal fault and kicked in , startingthe flashing light.

If you are in situation one, then theTV will reset just unplugging power cord for one or two hours,sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

Common faults that can occur are a blown capacitor on power board, a convergence IC has blown, or a fault on Digital board.

Check also the video cable or any external connection cable, if the cable is shorting, or the connector is bad, you can get same flashing state because of the video cable.

If under warranty contact the manufacturer ringing the number on the user manual

If you want to repair at your own expenses, just locate any good qualified repairer.

Aug 18, 2007 | Zenith L13V36 13" Flat Panel LCD Monitor

Not finding what you are looking for?
Computers & Internet Logo

Related Topics:

202 people viewed this question

Ask a Question

Usually answered in minutes!

Top Zenith Computers & Internet Experts

Cindy Wells

Level 3 Expert

5298 Answers


Level 3 Expert

77932 Answers

The Knight
The Knight

Level 3 Expert

74999 Answers

Are you a Zenith Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides