Question about Hitachi 50V500 50 in. HD-Ready LCD Television

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Power does not come on on my tv hitachi50v500

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  • Hitachi Master
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Http://www.eserviceinfo.com/downloadsm/13178/Hitachi_50V500.html
http://www.retrevo.com/support/Hitachi-50V500-TVs-manual/id/372ag005/t/2/
http://fileshare.eshop.bg/index.php?what=search2&searchstring=50V500
OK links for service and repair manuals,
IF you wish to try to fix it yourself, and I do not recommend it. FIRST, you Must get a service manual, then you need, equipment, an Oscilloscope is a MUST HAVE. Also a Multimeter, and soldering iron, a DE-soldering station, an anti-static wrist strap, (Any TV is extremely static sensitive). Now FIRST you must make sure the Power supply is 100% as if this is NOT then nothing else can be. Also there are safety considerations, any unit that can cause a Fire or Explosion, or both, needs to be attended to with the utmost care. As if it isn't done correctly, a catastrophe is indeed possible, Faulty sets can cause a fire, and a fire in the middle of the night, I believe is not good. And any person that has attended that set, will be held to account. Now with that understanding, I guess proceed if you wish. Troubleshooting say if it is shutting down, after a certain amount of time, of working and then faulting, then it is most definitely a "Thermal" problem, the way we "Find" problems such as this is "Freeze Spray" you use this on each component that is suspected of being the "Culprit" and you will soon,find that errant component. Now also not every fault is a Capacitor, I see many, many people that think, that Capacitors are always the "Culprit" now while that may be true in a few cases, a faulty Electrolytic Cap, or ordinary, Cap goes faulty, this is only a SYMPTOM, something has damaged those caps causing them to "Fail". One MUST always find the root "Cause", otherwise if you just treat, the SYMPTOM, the "Cause" will just make the "Symptom" come back, in short order, as the prime cause still, hasn't been fixed., Now Capacitors hate AC ripple, or Over Voltage. Thats it. Oh.. and Heat, if these Capacitors, are too close to a Heat Source, then thats a prime cause of failure. Resistors, hardly ever go faulty,and if they do, it is generally obvious. However it doesn't hurt to check values with our Multimeter. Remember though resistors are made, with up to 20% tolerance from stated value, as such, are not too critical, unless in Timing circuits etc. Always check, the Values, of resistors, as with any other component, with the power OFF. Now Diodes especially "Zener Diode", are another thing to check, those and ordinary "Signal Diode" should always be suspect. next we have Transistors and IC's. The Transistors MUST ALL be checked to see if they have a good, "Junction" this is done, with our meter set to "Diode Test" and usually are about 0.6 to 0.7. With IC's you must check, voltage levels, or Logic Levels, going in and out, have a look at the circuit diagram, and it will tell you what they should be. It is a good idea to always measure the Power Supply voltages, see if a "Rail" is Low, that will be because some component has gone somewhat or all short circuit, to Earth, now, if the "Rail" is Higher, suspect an "Open Circuit" component, like a Diode, or Transistor. The voltages expressed in the manual are spot on, ANY variation MUST be investigated. I have been doing all this for over 30 years now, and I do indeed wish, we could have a set of "Symptoms" and be ables to say.. "Oh that;s the so-in-so and replace this" however unfortunately this although does happen, most "Symptoms" can have literally tens, of "Causes" all often "Interlinked" One simply has to do a methodical troubleshooting procedure, and always think, "are my Voltages Correct" as this is how, you Fix the problem, by making them so. Keep up the good work. If that link above doesn't furnish a Service manual, it is imperative you get one, even if you must pay for it. It will pay for itself in about 2 mins. Now just replacing boards will most likely just end up with more faulty, boards, as related you MUST ensure that you have the cause of the event, before we change anything. I have seen so called, "Techs" replace every board, and virtually every component, and that STILL didn't fix it, because the "Fault, or Cause" lay elsewhere, and had not be repaired FIRST, you see that FIRST STEP, like everything in life, is, CRITICAL.
Now if you feel that it you do not want to do it. It is my professional advice is to get you set looked at by a Toshiba Authorised Service Centre, and ask for free "Quote", this way, you will be able to make an informed judgment, as to repair or replace. As these days seemingly insignificant SYMPTOMS, often cost as much to repair as it may cost to buy.

Posted on May 05, 2010

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Jan 26, 2016 | Televison & Video

1 Answer

How to shut off manually


UN55D6400UF TV Will Not Power Off If your TV is on but will not power off when you press the power button, you could be having an issue with your remote control or a faulty circuit inside your TV.
To determine the source of your problem, follow these steps:
  1. Power the TV on if it is off.
  2. Unplug the TV from the wall outlet for 30 seconds, and then plug the TV back in.
  3. namo_fileview.jsp?type=nfs&pid=decisiontree&did=57355&cid=yokn68wxkhym@namo.co.kr&sep=%7c
    1. Press the POWER button on the remote control.
    2. [img src="http://support-us.samsung.com/cyber/namo/namo_fileview.jsp?type=nfs&pid=decisiontree&did=57355&cid=79HKC8BOY9YC@namo.co.kr&sep=%7C" height="51" border="0" width="50">
      • If the TV powers off when you press the POWER button on the remote control turn the TV back on continue to Step 4.
      • If the TV does not powers off then there is a problem with the remote control. Click here to go to the Remote Control troubleshooting section of this guide.
    1. Press the POWER button on the TV.
      • If the TV powers off with the remote but does not power off with the power button on the TV there could be an issue with the touch sensor on the TV. Before setting your unit up for service try these two things.
        1. Try sliding your finger accross the power button.
        2. Have other people try using the touch buttons on the TV.
        3. If either of these two options work then there is not an issue with the touch sensor on the TV. There are many variable that can limit the conductivity of a persons fingers. The conductivity of your fingers might not be enough to easily control the touch sensor on the TV.
        4. If the TV does not power off when you press either the POWER button on the TV or on the remote control, then the TV will need to be serviced. Click the Create online service request button below to have the TV repaired.

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No power


Got no power on my tv need sone advice as change fuse still not working

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1 Answer

My proscan 42la45h wont get power. no red or blue light


U check the power source like the power a/c outlet?Yes?Tries tv unplug,replug it back like about an hour later.The tv should resetting itself back to the tv factory setting,tv now should have power again.Not.The tv have a power supply board problems and the causes.That the board where the tv power a/c cord plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a whole new refurbish tv power supply board for the replacement.

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1 Answer

My TV on button is not turning the TV on. I tried the remote as well as the button on the TV.


Now,what happening to the tv power LED light indicaton,when u turn on the tv now?Tv don't have any power LED light incation at all or power LED light indication is flashing?Check ur power source with other devices,see if the outlet is the problems,if tv still have no power to the tv all.Tv LED power light indication is flashing?Tries tv unplug,replug it back like about an hour later for the tv to do a resetting itself back to the factory setting.Now tv should work be again.Still have the same problems,this indication ur tv have a bad or a dead power supply board.That the board,where the tv power a/c cord plug into it.If u understanding basic electronic and have all the tools.Take the tv backcover aparts.Check the tv power supply board carefully for dying capacitors parts,these capacitors parts are dying or dead,most of the times they're bulging up or puffing up onto it tops.Replaces these capacitors parts with new capacitors parts with the same micro ferid but higer voltages like about 5 or 10 voltages higher for better heat resistances and last longer.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

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3 Answers

I lost power in my house. I cannot get the TV to power up. Is there a reset button? what do I have to do to get power on the TV? All the other components linked to the TV are working.


Now,there is no power to the tv at all?Yes.Tries tv unplug,replug it back like about and hour later.That the resetting tv back to the factory setting.The tv now should be working again.If tv still have the same result,tv power supply board have problems,that the board,where the power a/c cord plug into it.Check the tv power supply board fuse,because u lost main power to the house.If u lucky,the tv power supply board only have a dead fuse,fuse is near where the power a/c plug,plug into tv to get it power.Fuse can buy it anywhere like Radio Shack like $1.50.After u repalced the fuse,if tv still getting the same result,than sorry ur whole power supply board have problems and it is dead.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

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1 Answer

The tv does not turn on when plugged in. I do not see any lights indiucating any power. ANy suggestions?


Hi,

your TV is having a power problem. The power supply board is defective that's why the TV won't power up. Its receiving power but it cannot transfer the current to the necessary part of the TV because a capacitor, diode, etc may have been faulty. Until these bad components are replaced, the TV might not come on.

This may have occurred as a result of power surge/irregular power supply or excess power that may have entered into the TV previously.

If you know about TV repairers, I would suggest that you open the TV and read the power board/panel with a meter, detect the bad component and replace it. Take note that TV stores a lot of current that can shock, so leave the TV for a while before you open it.

If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you.

I wish you good luck.

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TV will only stay powered up around 30 minutes. After 30 minutes tv will only powqer back up after a 30 minute or so cooling period. When tv powers off light goes amber just as though it were physically...


Power supply board have intermitten problems,not sustancenig a constance power to the tv.The tv power up 30 mins within the time frame,the tv work than,yes?The power supply board,that the board,where the power a/c coard plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.

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1. simultaneoulsy press and hold [menu] and [vol-] on TV side panel
2. press and release [power] on TV side panel
3. count to 5 and release[menu] and [vol-]
4. TV should have turned on
5. if not, unplug TV and press[power]
6. repeat from step 1 if the TV does not power on the 2nd time

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switch tv on the switch can not contribute to that. unless the following goes fault
i switch getting fixed on one position(holding)
ii check power on a input of tv and input fuse
iii power supply, i have said that because if a power supply is ok, sound was going to be there.

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