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Vistron flatscreen standby light flashes every 4 seconds but tv won't turn on. Was told could be power supply board. Any suggestions

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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jan mczeal
  • 632 Answers

SOURCE: when i switch tv on, it shows picture for 5

The problem is associated with the power supply that cannot run under load. The showing of picture for a brief period of time indicates that the main board, ballast, inverter and panel drive are all OK. The unit turns on but the power supply cannot sustain the power requirement of the unit and shuts down.
The usual culprit on the power supply are blown or bad capacitors. Check the power supply for such capacitors. If no apparent damage or defect is found, replace the power supply.

Posted on Nov 07, 2009

Testimonial: "thanks for that i will have to let the tv engineer have a look at it"

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  • 1 Answer

SOURCE: my emerson tv standby light is on the power light flashes twice

Mine stayed in stanby mode and all I had to do was to switch the plug to a different outlet. The power strip it was on wasn't providing enough power. It worked fine for a month before I had a problem.

Posted on Dec 20, 2010

SOURCE: I got a Sony Bravia

http://www.smpcshop.com/KDL-40WL135-KDL-46WL135-p-8895.html
Above is a link for a service manual.

Hi, well I applaud you for starting in the right place, The power supply, as, if, that isn't right nothing else can be. But you simply cannot do anything without a Service Manual. In this it has everything one needs to repair the set. OK if it is shutting down, after that 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.
Gee it seems that you have replaced just about the entire "Guts" of the set, in the industry we call this the "Shot gun" method, however it seldom works in reality. One really needs to isolate the Cause, of the "Fault" and repair that and also any damage done by that. As if one doesn't remove the "Cause" it will simply fault again when the "New" bit is connected up. One needs to get the unit going section by section, testing and proving the prior section before connecting up to the next, which also must be tested to make sure that what you are going to connect will NOT damage what you are connecting it to.
Also unfortunately, these LED's Blinks, are NOT an error code in actual fact.
What you need to do is use the service manual, and follow through the troubleshooting steps, to isolate and hopefully repair your problem.
Basically it is all about voltages and if they are correct, a Higher voltage than stated usually means a component is Open circuit or a very high resistance, whereas a Lower than stated voltage usually indicates a Short Circuit, or low value resistance component, is "Faulty". These are all in the SM, as are the waveforms that must be checked, it is indeed very difficult to repair electronics these days without specialised equipment and even though I have over 30 years experience i find it difficult, so good luck.

Posted on Feb 24, 2011

dbTVfixer
  • 79 Answers

SOURCE: LG 32LH2000 My TV was turned of last night in the

most LG have a "vacation switch" on the bottom right hand side of the set very near that standby light.

it is placed poorly, where you can accidently click when grabbing the TV to move it or swivel it.

it is a toggle switch, a "master power" switch.

you may have bumped it to the off position. flip the switch, your standby light will come back on.

Posted on Apr 16, 2011

bugoy31
  • 1238 Answers

SOURCE: My flatscreen won't turn on it keeps going red to standby

Good day!!!!


Commonly that trouble is cause of faulty capacitors on power supply board...

Power supply looks like this:
11_29_2011_4_39_16_pm.jpg

Please follow this step on how to fix that problem on your own..

  1. Open the back cover of your TV.
  2. Look at the power supply board..Its normally connected to the power cord..
  3. After that,,try to look at the actual image of capacitors if it is bulged on the top so that you can easily determine the bad capacitors..
  4. After that,,try to replaced the bad capacitors using soldering iron and soldering lead..replaced the capacitors only with the same type ratings and value..
  5. Some of the capacitors not bulged so its better if have a capacitance meter..

Try to watch this video about capacitors and how to replace it...

I hope this solution will be helpful...

Thanks for using fixya...

Posted on Nov 29, 2011

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PANASONIC VIERA TX55as802b will not switch on red power/standby light blinking once every 3-4 seconds have been told its the screen and it cant be repaired can anyone confirm this or help.thanx


The manual says nothing about the power light flashing at that rate. Unless an expert tells you that's the specific indication for a failed screen, I wouldn't believe it. Most TV's will give you sound even if the display has failed.

Try resetting it by unplugging and waiting 60 seconds before plugging it back in.
If that doesn't work, most likely the power supply board needs to be replaced. Or possibly the T-con board.

If you don't know what you're doing, DON'T OPEN THE TV UP TO FIX IT, THERE ARE HAZARDOUS VOLTAGES ON THE POWER SUPPLY BOARD, EVEN WEEKS AFTER THE TV IS UNPLUGGED!

If you don't know how to do it yourself, find some local Electronic repair shops, get quotes, try to find reviews on the shops.

Sep 20, 2016 | Panasonic Televison & Video

1 Answer

My flatscreen won't turn on it keeps going red to standby


Good day!!!!


Commonly that trouble is cause of faulty capacitors on power supply board...

Power supply looks like this:
11_29_2011_4_39_16_pm.jpg

Please follow this step on how to fix that problem on your own..
  1. Open the back cover of your TV.
  2. Look at the power supply board..Its normally connected to the power cord..
  3. After that,,try to look at the actual image of capacitors if it is bulged on the top so that you can easily determine the bad capacitors..
  4. After that,,try to replaced the bad capacitors using soldering iron and soldering lead..replaced the capacitors only with the same type ratings and value..
  5. Some of the capacitors not bulged so its better if have a capacitance meter..

Try to watch this video about capacitors and how to replace it...

I hope this solution will be helpful...

Thanks for using fixya...

Nov 22, 2011 | Emerson LC320EM8 32 in. LCD TV

1 Answer

Sony TV KDF-E42A10 Projection TV Standby light flashes 4 times. TV turns on for 5 seconds and turns off with standby light flashing 4 times. TV will not stay on.


Hello,


Your power supply board is not yet dead, you know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

Hope this helpout in solving the problem......

Jan 11, 2011 | Sony KDF-E42A10 42 in. LCD Television

2 Answers

Television only has a flahing red light


Hello,

Ur power supply board is dead, u know basic electronics’ and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your tv power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement. Hope this will help...

May 27, 2010 | Sony BRAVIA KDL-40V2500 40 in. LCD HDTV

1 Answer

Sony 42 inch plasma tv standby light just flashes tv


You might have a bad B board. What's worse is that the power switch is connected to the Q board which works in conjunction with the B board. Replace B board, You can send your B board for repair to a company called modus link pts. They are the largest part supplier of after market parts and repair.

Feb 24, 2010 | Sony WEGA KE-42TS2 42 in. HD-Ready Plasma...

1 Answer

When i switch tv on, it shows picture for 5 seconds then goes into standby. the tv is a vistron ltm-3271e lcd


The problem is associated with the power supply that cannot run under load. The showing of picture for a brief period of time indicates that the main board, ballast, inverter and panel drive are all OK. The unit turns on but the power supply cannot sustain the power requirement of the unit and shuts down.
The usual culprit on the power supply are blown or bad capacitors. Check the power supply for such capacitors. If no apparent damage or defect is found, replace the power supply.

Nov 07, 2009 | Televison & Video

1 Answer

Kv-34hs420 Standby light blinks 6 times. Power supply issues?


Replace IC6501 and IC8002 at same time, both have same number and located parallel on DZ board. Part number is as follows..
670581001 MCZ3001DB
Available in Part Store.

Jun 26, 2009 | Sony FD Trinitron WEGA KV-34HS420 34" TV

2 Answers

Viewsonic LCD TV Power Issues?


You have probably already resolved this, however if your TV is 32" or smaller it likely has bad capacitors in the power supply. If you try it once more take note of: Does the red standby light still come on? If so, unplug the unit and either replace the capacitors in the power supply or purchase a new power supply from a Viewsonic service centre. Don't keep plugging it in and trying to get it to work in this condition or you'll completely blow the supply. If the standby light no longer comes on and the tv will no longer power up, the power supply board is toast. Get a new one and install it (they are pretty easy to install, unscrew the remove the back cover, remove the shield covering the boards, unplug two plugs going to the power board and remove the board. Install the new board and reassemble.

Aug 03, 2008 | ViewSonic NextVision N2010 20 in. LCD...

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