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Dan T.
Dan T., Master Technician
Category: Electronics
Satisfied Customers: 7613
Experience:  USAF trained; currently teaching electronics for the DoD.
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Please help! When we try and turn on our tv it won’t respond

Customer Question

Hi!! Please help! When we try and turn on our tv it won’t respond to the remote (changed batteries a few times, they’re the right way round)
Assistant: What is the model of your TV?
Customer: when I unplug the power cable wait for caps to discharge (30ish seconds) plug it back in again I get:
Assistant: What menu options can you access, if any?
Customer: green flash.
Assistant: Anything else you want the TV Expert to know before I connect you?
Customer: then rapid green flashing a pause
Submitted: 7 months ago.
Category: Electronics
Customer: replied 7 months ago.
Then a red flash and then a pause...then continuing red flashes at roughly 5 seconds intervals.We’ve checked the mains power wall outlet and changed to a different one and nothing.I’ve done a power reset (press and hold power button on the unit for 30 secs after removing the power supply)
Customer: replied 7 months ago.
The sound MOMENTARILY sounds for about 1 second and the screen flashes VERY slightly and then goes to the continuous red flashes.
Customer: replied 7 months ago.
The tv model is: TX 55dX650B
Expert:  Dan T. replied 7 months ago.

Welcome to the site! I'm Dan and I'd be happy to help! Sorry to hear you're having trouble. Are you using the remote only, or have you tried the TV's own power button?

Customer: replied 7 months ago.
I e tried the TVs own button on the monitor.Nothing.
Expert:  Dan T. replied 7 months ago.

Thank you. How old is the TV? Have you ever replaced any internal parts?

Customer: replied 7 months ago.
Just over 2 years old.Never replaced anything inside.
Customer: replied 7 months ago.
I’ve heard there’s some caps that can go?
Customer: replied 7 months ago.
Capacitors.
Customer: replied 7 months ago.
The weird thing is that I can momentarily hear sounds after the green flashes and then it stops after a second and then shows the red flashes.
Expert:  Dan T. replied 7 months ago.

Ok. Yes, absolutely. The most probable cause of the symptoms you're describing is a faulty power supply board. That's where the capacitors are. You can order the board >>here<<. Alternatively, the capacitors themselves can be replaced but that is not a guaranteed fix and it quite a lot more work.

Customer: replied 7 months ago.
I solder 0402 smd all the time at work so handwork on the bird isn’t scaring me, but just like with my products, if I crack the TV open, Panasonic won’t touch it.
Expert:  Dan T. replied 7 months ago.

That's right, they won't touch it after you open it. However the TV is already past the warranted period so that shouldn't matter.

Customer: replied 7 months ago.
Understood. Do you know the values of the most commonly burnt out caps?
And size? From the view of that board they’re probably through-hole?
Customer: replied 7 months ago.
This is so annoying too. Such a silly thing to go wrong.
Expert:  Dan T. replied 7 months ago.

Yes, they are through-hole. I am opening the service data to see if there are values for the caps listed.

Expert:  Dan T. replied 7 months ago.

Ok, the schematics show everything nicely. Could I upload a copy for you to download?

Expert:  Dan T. replied 7 months ago.

I normally don't give them away but you sound like you are experienced so I will do it for you.

Customer: replied 7 months ago.
Yeh if you pop that over I’ll get a load from Farnell. So irritating. Didn’t wanna be soldering a telly this weekend!
Customer: replied 7 months ago.
Ah okay understood. Well don’t do anything you don’t need to but if not I’ll just ring out the caps with a fluke and see which are bust.
Expert:  Dan T. replied 7 months ago.

Sure. >>Click here<< and see if it will download for you.

Customer: replied 7 months ago.
Through-hole will have the detail bringer one the shrink so not the end of the world.
Expert:  Dan T. replied 7 months ago.

The board is TNPA6263. Schematics are near the end. It's called the P-board.

Expert:  Dan T. replied 7 months ago.

The problem is usually the large electrolytic caps.

Customer: replied 7 months ago.
Ok I’ve got that.
Expert:  Dan T. replied 7 months ago.

Ok.

Customer: replied 7 months ago.
Okay there’s three daily clear there on the board. They’re pretty high capacity!!
Customer: replied 7 months ago.
Can’t see any details properly here.
Customer: replied 7 months ago.
Scratch that - found the PCB layout at the bottom. Cheers.
Customer: replied 7 months ago.
Okay new board is easier, I’ve counted about 15 caps and could be any one.
Expert:  Dan T. replied 7 months ago.

Ok.

Customer: replied 7 months ago.
Looking at the board, I can’t see any particular cap that is domed/ blown.
Customer: replied 7 months ago.
Do you have any reference material that says which is the most likely?
Expert:  Dan T. replied 7 months ago.

No, there is nothing about that. Just the schematics. All of the electrolytic caps would typically be replaced, in addition to any power transistors....or the whole board.

Customer: replied 7 months ago.
Understood.None look marked/scorched/dome headed.All look in pretty good nick. The link you gave me didn’t have the board is stock, which is a little worrying.Do you tend to use other suppliers for boards of this nature?
Expert:  Dan T. replied 7 months ago.

https://www.tvparts.co.uk/

https://www.expresstvparts.co.uk/

https://spares2repair.co.uk/

https://www.tvpartsfixit.co.uk/

https://www.sjstv.co.uk/parts-shop

Customer: replied 7 months ago.
Brill.
Expert:  Dan T. replied 7 months ago.

Hope it helps.