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TV shuts off randomly

I have a Panasonic TV with a tnp2ah017 main A-Board. all 3 of the 200V caps showed signs of age and the 150uF one showed signs of overheating (shrink label pulled down over can, top convex) I can't see any obvious defects, and noting I can measure on a regular basis seems out of the ordinary. I do NOT have a high voltage meter at the moment. once every 3 days, or up to 3 times a day, it will shut off for 15 to 45 seconds, then automatically return to normal operation, and keep going, It turns itself back on after shutting off, and it's the protection relay that seems to be doing the shutdown, but I don't have any schematics, so I am a bit lost. I need someone that actually is old school component repair and knows what he's talking about to help please - rookies need not put in their 2 cents worth please. I don't have access to an oscilloscope or HV meter currently, so please don't ask me to take measurements that require them - just point me at the right IC, diode, capacitor, whatever....and I'd love an explanation of why if you have it, but I know myself that often you don't have one if you have worked in the industry for years. I know myself often it's as simple as "if problem X, then replace transistor Y", and I can accept that.

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Main power supply regulator board fault. It will be best to replace it as card basis rather than trying to repair it. If you wish to get more details visit the site linked here. http://electronicshelponline.blogspot.com/

Posted on Mar 02, 2017

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Slinteriors
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SOURCE: R517 Burnt D" board

you will need the flyback as thats way to low. The HV splitter will only direct the HV to each of the CRTs it doesnt change or regulate the HV in any way just directs (splits) it. Let me know if you need any more assistance.

Posted on May 08, 2008

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How do I fix my LCD TV that shuts off about 10 minutes after turning on?


Hi Mr. Joe,
It is not the power supply, it is the main board which is causing trouble. I had to replace the main board in a Samsung LA32C480 for the same fault some time back.The main board stops working ie gets 'HANGED' after some time.

Sep 11, 2015 | Samsung Ln40b650 40 1080p Lc ln40b650 /...

1 Answer

Random Side Panel Inputs


You either have a bad Main board or simply a bad touch control button in other word one of your side buttons is defective and it is blocking any other signal to the main board, but usually its a bad main board. In some cases ther is a FIRMWARE update from Panasonic, you may want to call Panasonic or check there website for any type of FIRMWArE UPDATE.

May 10, 2014 | Panasonic TH Televison & Video

1 Answer

Was watching tv and it shut off and will not turn on no clicks when you unplug it and plugin.it a panasonic 42 plasma


I see so many here with no sound/nopicture issues:

ISSUES:

1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.

Answers to issues:

1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.

2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.

Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.

What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.

3. Trouble shooting consists of the above and then at some point you have to buyand try a board to see if it fixes it or not.

4. Safety first--no TV set is worth getting injured or even killed over.If set is opened at least look for puffed up and bad caps like in thisphoto.4_26_2012_2_52_13_pm.jpg

Apr 26, 2012 | Panasonic Televison & Video

2 Answers

TV WONT SWITCH ON LE26A456C2D standby light blinks 5 times, 1 long, 4 short then goes out and tv wont come out of standby. You then have to remove the power. PSU capacitors do not show obvious signs of...


Please read my giude then you may understand more as to what it takes to make the TV functions.
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 post back what you find.
Please leave rating if it helps.

Feb 18, 2011 | Samsung Televison & Video

1 Answer

My 55" vizio randomly shuts


I had a similar problem with my 42 in Philips LCD HDTV.


Here was the problem. My Power Supply Board had several bad capacitors. I opened my TV (warranty was expired of course) and found four bulged capacitors on the PSB. Many major electronics companies Philips/Magnavox, Sony, Panasonic, and others were sold capacitors that failed in 2-5 years instead of 10-20. The capacitors fail prematurely due to a lack of preservatives. Unfortunately, they were installed in all sorts of devices and cause a wide range of failure problems.


Here are some options for you.


1. Have it fixed by a professional $$$$$$$??????? (Is it under warranty?)

Remember, TVs CONTAIN HIGH VOLTAGE AND CAN KILL YOU! Do this at your own risk.

2. Open your TV and find PSB. (The board that the power cord plugs into) Check for faulty caps. If you find some (bulged or leaking) bad caps replace the entire board. The entire board costs around $250 right now because they are in high demand right now. They can be found online. I would definitely shop around though.


3. Remove and then replace individual faulty caps. This takes some soldering skill.

Caps are inexpensive and if you can take care of it yourself it will save you hundreds.


This may be your problem. If you determine that it might be.

I have a Tip/How TO tutorial on this site that may also help. It gives step by step instructions for replacing caps on PSB #715t2432-2. If this is your board you are in luck. Here is the Link: Fixing the Philips Turns/shuts off on its own problem. I'm working on uploading pictures to help guide people though the process as well. Let me know if I can do anything to help.


Hope this helps and if it does please rate it accordingly. Good luck.

Dec 19, 2010 | Vizio VF550XVT 55 in. LCD TV

1 Answer

Tv screen goes completely black at random times, sound is still present, or the tv shuts down at random times, must be unpluged then pluged back in to restart.


I had a similar problem with my 42 in Philips LCD HDTV.


Here was the problem. My Power Supply Board had several bad capacitors. I opened my TV (warranty was expired of course) and found four bulged capacitors on the PSB. Many major electronics companies Philips/Magnavox, Sony, Panasonic, and others were sold capacitors that failed in 2-5 years instead of 10-20. The capacitors fail prematurely due to a lack of preservatives. Unfortunately, they were installed in all sorts of devices and cause a wide range of failure problems.


Here are some options for you.


1. Have it fixed by a professional $$$$$$$??????? (Is it under warranty?)

Remember, TVs CONTAIN HIGH VOLTAGE AND CAN KILL YOU! Do this at your own risk.

2. Open your TV and find PSB. (The board that the power cord plugs into) Check for faulty caps. If you find some (bulged or leaking) bad caps replace the entire board. The entire board costs around $250 right now because they are in high demand right now. They can be found online. I would definitely shop around though.


3. Remove and then replace individual faulty caps. This takes some soldering skill.

Caps are inexpensive and if you can take care of it yourself it will save you hundreds.


This may be your problem. If you determine that it might be.

I have a Tip/How TO tutorial on this site that may also help. It gives step by step instructions for replacing caps on PSB #715t2432-2. If this is your board you are in luck. Here is the Link: Fixing the Philips Turns/shuts off on its own problem. I'm working on uploading pictures to help guide people though the process as well. Let me know if I can do anything to help.


Hope this helps and if it does please rate it accordingly. Good luck.

Dec 17, 2010 | Philips 42TA648BX 42 in. LCD TV

2 Answers

Hi there, i have a Dell tv model W3000 lately the tv does not turn on at all,i know power is there but the tv does not comes on. sometimes it comes on but it does not last....if i turn the tv off it does...


This is the way all of these fail. Don't buy Dell TV's.
Try this internet posted solution.
Turn on TV with remote control, if the TV does not light-up, find the Main Power Switch. Turn the switch off, then turn it on, the TV lights-up. Probably caused by poor contacts due to age and low quality parts.

Apr 27, 2010 | Dell W3000 30 in. HD-Ready LCD Television

2 Answers

I get a green power button, no picture. I have to turn the Dell TV on 6-10 times beofre picture comes up. What is wrong with it?


I have this tv, and have had the EXACT problem. my solution was simple. if you take the back cover off of the monitor, there are 2 boards on the outside edges of the left and right of the monitor. these boards are covered by metal shields. remove the 3 screws on each board shield and slide them off.(careful this can be tricky) on the boards are 2 capacitors that need to be replaced. 4 total, 2 on each board. the capacitors are 150uf at 35 Volts. go to your local electronics repair shop to get the parts and tools needed to do this repair.
make sure to get the polarity of these caps right. stripe side on cap goes to the minus. 1

Mar 28, 2010 | Dell W3000 30 in. HD-Ready LCD Television

1 Answer

TV shutting off randomly


it looks like a faulty mains board. you need to upgrade the tv software with the latest update. if the tv is not accepting the upgrade then it can be a crook mains board.
hope it helps! please rate my comments :D

Mar 19, 2009 | Samsung LN32A550 32 in. LCD TV

1 Answer

Panasonic TV Shuts off by itself


I had the same problem , Good sign of a cold solder or cracked trace.

On my PT51HX41 after a long check with a magnifying glass I found the problem on the main board just below the AC daughter board there is a Blue rectangular box (relay R801) and it had two cracked solder joints.

Jan 22, 2009 | Panasonic PT-51HX41 51" Rear Projection...

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