Panasonic TCP50S1

[Rustifer134]

Re: Panasonic TCP50S1

I think I am with you so far. But, if I could go back to #7 post "remove the power cable and the SC20 cable from the SC board". By power cable, you are speaking of the SO cord that plugs in to the receptacle, correct ? As in, remove the power source from the line filter. That I have done. Then, " Measure for short on the white prong connector of the SC board". Just to be clear. Is this the tiny white prong connector at the bottom left corner of the SC board. And am I checking between the prongs ?

[Moreno83]

Re: Panasonic TCP50S1

Ok my bad. You need to remove all the cables from the sc board and remove the buffer boards from the sc board so that they dont touch eachother. So that there is only the sc board left , then measure for short on the sc2 prong connector in diode/beep mode. Beep is bad.

[Rustifer134]

Re: Panasonic TCP50S1

With the SC board isolated, no beep across the SC2 prongs.

[Rustifer134]

Re: Panasonic TCP50S1

From this point, should I go back to post #16 ? Buffers isolated from the sc board. Jumper on SC50. I assume I am to replace the power supply connection to the SC board at this point. And check to see if the set comes on. But, I'm gonna wait for a confirmation.

[Moreno83]

Re: Panasonic TCP50S1

Ok that looks promising but still sc board can be the problem.

Yes keep the buffer boards where they are and reconnect both cables to the sc board.
Apply the hd jumper or short the 2 pins and turn on the tv md see if it stays on.

[Rustifer134]

Re: Panasonic TCP50S1

Something popped again. TV never came on.

[Rustifer134]

Re: Panasonic TCP50S1

I forgot to place the jumper when I tested it. Placed the jumper on and the set didn't come on, but it didn't pop either. Now it's 6 blinks instead of seven.

[Moreno83]

Re: Panasonic TCP50S1

Loud bang? Thats definitely not good. You sure the buffers don't touch the SC board?

Do the following: Remove the sc board from the tv and see if you notice any burn marks like transistors that got blown.
On the SC board you will find markings with Q and D. The parts with Q , for example Q401 & Q401 are fets and you can measure them in diode/beep mode. Measure the outer pins and see if you hear a beep , if so ...beep is bad! ( markings are also on the back of the board , makes measurement easier ).

The parts with D in front of it are diodes. You need to put the black prope on the middle pin and the red on one of the outer legs , again beep is bad. ( Can give short in circuit ).

Tells us what you are measuring.

[Moreno83]

Re: Panasonic TCP50S1

Ps if you find a short on the SC board , try to find out if the SS board is still ok by measuring the parts.

There is a repair kit on Ebay but a lot of components. Maybe refurbished SC board?

[Rustifer134]

Re: Panasonic TCP50S1

Wasn't a loud bang. Just a little pop. Not quite as loud as a hand clap. Like a static discharge. And that was without the jumper on sc50. With the jumper on sc50, no pop. vent fans start and immediately stop. I will now remove the SC board and inspect it.

[ReeceyBurger123]

Re: Panasonic TCP50S1

Killed the Sc by running it with out SC50 connected is my guess.

[Rustifer134]

Re: Panasonic TCP50S1

Received beep on the following - Q601 D-G, D-S, S-G. / Q661 E-G, E-C, C-G. / Q443,442,441 E-C. / D441 K-A. / Q451 E-G

[Rustifer134]

Re: Panasonic TCP50S1

What is the proper way of removing the ribbon cable from ss21, bottom right side of the ss board ?

[Moreno83]

Re: Panasonic TCP50S1

Running the SC board without the jumper is ok , it would simply shut down with 7 blinks.

The orange ribbon cables can be removed by pulling the black latch out ( pull it a little out of the socket , latch cant be removed ).
The orange ribbon cable can now be removed , its hooked with 2 small tabs. Can be stuck because of aging and heat.

Your SC board is bad , try to repair it with a repair kit on Ebay or buy a repaired board......

[Rustifer134]

Re: Panasonic TCP50S1

Ok. Thanks for you help.

And upon further inspection, I noticed this. I wonder if this happened before or after the jumper incident.

[Moreno83]

Re: Panasonic TCP50S1

This probably happend both times. You heard a pop which resulted in a 7 blink error. Maybe it took another hit when you used the jumper. With the jumper you tell the tv to turn on without the buffer boards. My guess is that the voltage finished the rest what was already "dead".

Its best to remove the buffer boards completely from the tv and test them as in this video:

https://www.youtube.com/watch?v=51SZsfH60EY