TV Repair Questions? Ask a TV Technician
I opened the back panel and am looking at the tv. The on/off switch is not the issue. The power cord is working. What am I looking for?
All the capacitors are in perfect condition.
Whats an ESR meter?
The model number is *****
The model code is LN40A500T1FXZA
Hi, you may find your question closed due to a time out which is nothing more than no response within a time period.
James was on the right track about your TV set, the fact that it clicks on and off repeatedly usually points to bulged capacitors on the power supply board. Since you state the top of the caps are "flat as a pancake" it may very well be the clicking on and off could still be bad caps.
However...nobody informed you that questionable caps should eventually improve to the point the TV starts working again, given enough time.
So, what I'm going to suggest is this. Plug in and turn on the TV set and ignore it for 45 minutes to an hour. If it starts up all by itself, and stays functioning, then the power supply caps are at fault.
If it still clicks after an hour, I have seen some main board failures that can cause that problem too.
So try that -- plug it in, let it run for an hour, and let it click. See what happens to your TV set 30 minutes, then 45, the an hour later.
Forget the ESR meter, they are great for testing caps, but we have to work with what we've got available to us.
An hour of your time doesn't cost you anything, and worst case scenario is we buy a $30 Sears voltmeter to check the 5 volt power supply and test the Power On command line to see if it stays high or not.
Time will tell....
Let me know what happens.
Good evening. Just got home and plugged the tv in. I will send another email in about an hour.
So after turning on and off on its own for about 10 minutes, the TV turned on and stayed on. I pressed the power button and the tv turned on. When I tried to turn it on, it started struggling again for about 5 minutes.
Then the cycle started all over again.\
Bad caps...you got bad caps, no matter HOW FLAT and Perfect they look.
Yes, they will bulge and crown as time passes by...
James knew, but the caps haven't visually died yet, and you don't have an ESR meter, and I wouldn't expect you to buy one unless you were a TECH...
Bench Tech that is....not a field Tech.
They're kinda salty....
Ok, let's COMPARE the cost of buying a power supply ---VERSUS--- the cost of the caps, solder, solder wick, SOLDERING IRON , and your time .....
Personally, I 'd just get the board and not worry about testing and finding them -- that's for guys with Lab Coats like this character --
Yeah, I'm thinking of changing my Avatar -- This one character epitomizes how the rest of the world sees most techs...made me laugh the moment I saw this 20 years ago.
I'm just going to do the research now....
Model number -- LN40A500T1FXZA
Hmm, no service bulletins about the bad caps on your model...there is one about the TV shutting down, but that's not your symptom.
Your's won't start...
But the LVDS cable should be unplugged on both ends to "buff" the contacts, it can cause a startup problem, AND if you disconnect ONE END and it starts reliably, then I'd replace it.
LVDS part number -- BN96-07161C
Don't buy one, just disconnect it and see if the TV turns on and off reliably.
This place has pictures of a lot of the boards, no picture of the LVDS cable, but it's a GOOD REFERENCE so you can use it to verify what board we are talking about.
Now the power board's part number is *****BN44-00199A
And that's only $50 for the board, cheaper than the cost of a soldering iron, solder, caps, wick etc...and easier for you to install.
Here is where you can order it --
ShopJimmy has the better price than any other.
Run that LVDS cable test, and if it starts when cold, plug it back in and see if it fails -- that helps to VERIFY the problem as the LVDS cable, or the power supply board !
If you have any questions, just ask
I ran the tests and the tv did not stay on an any of the tests. I think I will order the power board. The model number that you gave me was a little off: should have been an A at the end of the model number, not a B. Nevertheless, its $51.99 at Jimmys. However, the order process is a nightmare: would not let me register due to error on their webpage, then when I registered, it said that my information was not "properly registered" with their \company for me to place an order.
I will look around as the other links you gave me were fine except they are too expensive. Thanks for all of your help! If you come accross a cheaper one, please let me know.
There was an error on the site and I think that the question was re-submitted. It also did not allow me to finish my feedback. I did accept your answer, by the way :)
Just wanted to let you know.
Thanks, ***** ***** did show up.