Panasonic Plasma TC-P42U1 my first plasma

[ryan74]

Panasonic plasma tc-p42u1
power on
solid red led for 5 sec.
flashing red led blinks 7 times.
I could really use a service manual, blink codes, or other help if anyone has had this issue.
i can put up pics if needed but i havent tested anything on it yet.
thank you

[mariushm]

Re: Panasonic Plasma TC-P42U1 my first plasma

Here you go, the tc-p42u1 :

and here's tc-p4u2 just in case :

[ryan74]

Re: Panasonic Plasma TC-P42U1 my first plasma

I can't believe how much is in a plasma compared to lcd.

Code 7 blink = driver sos2 (sc floating voltage are)
Check sc, su, sd boards
I also read to test fet. Mosfet transistors on sc board (common prob)


I will start by testing voltages to isolate problem but circuit boards are new to me and I don't have a degree. Trying to teach myself.


*any general help, tips, guides, or training anyone can offer would be great.*

[drpj23]

Re: Panasonic Plasma TC-P42U1 my first plasma

You can generally locate the problem by disconnecting the SU and SD boards from the SC board and see if it stays on or not. If it does stay on....one of those buffers are bad, if not, then most likely SC. Most often, you can disconnect the Y sustain (SC) and the TV should power up no problem (given the Y SUS was the problem) but with Panasonics, they tend to just throw different error codes upon doing that lol.....which is really only helpful if you have the troubleshooting flow chart. So try the first thing I said too.

[ryan74]

Re: Panasonic Plasma TC-P42U1 my first plasma

I disconnected a 2 wire con and a 1in. Ribbon cable from sc board and powered on.
6 blink code= driver sos1 (sc/ss energy recovery circuit
Check su, sd, sc, ss board
This time it shows ss board (su,sd,sc are disconnected)
I assume the problem is there in the ss board?

Now I'm going to try just disconnecting su,sd
I did all 3 first because it was quiker.

[tom66]

Re: Panasonic Plasma TC-P42U1 my first plasma

Can you see a connector SC50 on the SC board? Newer Panasonic plasmas will also throw a hissy-fit if you unplug the buffers too. No idea why, it's a useful diagnostic tool, but it can at least be overridden.

Your problem is most likely SC, SU, SD. SS is probably fine for now.

You want to unplug the buffers if you've got SC50 because then it can be tested with just one or the other.

[ryan74]

Re: Panasonic Plasma TC-P42U1 my first plasma

i reconnected sc board and removed su and sd. 7 blink code

yes sc50 is there(see pic). so all i do is jumper sc50 and power on?

[tom66]

Re: Panasonic Plasma TC-P42U1 my first plasma

Remove one buffer at a time and jumper SC with a hard disk jumper, screwdriver, etc.

[ryan74]

Re: Panasonic Plasma TC-P42U1 my first plasma

i removed 1 board at a time with jumper on sc50.
each time i plugged it in and hit power i got the same 7 blink code.

i guess this narrows it down to the sc board or somewhere down this path?? https://www.badcaps.net/forum/showthread.php?t=23531

off topic- legally can a person open a refurb tv shop without a degree? either collect, fix, and sell.. or that and repairs for people. either way is there liability isues?

troubleshooting faults on a component level im still trying to understand but im getting better at isolating the bad boards thank to you guys.

[ryan74]

Re: Panasonic Plasma TC-P42U1 my first plasma

should there be power at sc2? blue and white wires going into sc board from power board?

[tom66]

Re: Panasonic Plasma TC-P42U1 my first plasma

Yes, you can repair TVs without qualification in the UK. In the US, I am not certain.

You should have around 200V at SC2.

[ryan74]

Re: Panasonic Plasma TC-P42U1 my first plasma

ok there is a power issue I think. Service manual shows 6 fuses to check all listed at 250v.
I checked both sides of fuses and had:

F201 - cannot locate, I looked at the boards twice and couldn't find it.
F351 - 0v
F501 - 123v
F601 - 123 v.
F602 - .06v.
F603 - 60v.

0v. At sc2

What now?

[tom66]

Re: Panasonic Plasma TC-P42U1 my first plasma

Unplug SC2 and check Vs again. There is a test point on the power supply, test it from there to the chassis of the TV (back of plasma panel is fine.) Can you supply pictures?

[ryan74]

Re: Panasonic Plasma TC-P42U1 my first plasma

unplugged sc2 con
white wire to sc2 read 0-24v pulsing

fuses were the same.

tp9 - 0v.

i split the power board in half to get better pic.

[tom66]

Re: Panasonic Plasma TC-P42U1 my first plasma

OK, I would suspect the P board. Pictures?

[ryan74]

Re: Panasonic Plasma TC-P42U1 my first plasma

forgot to upload em sorry lol..there posted above now.
these are all rated high voltage so i assumed its all ac not dc v.
i noticed more tp
tp1 - .98v
tp2 - .98v
tp3 - 58v
tp4 - 65v
tp2 and 4 had a neg.(-)mark by it. if im suppose to run meter neg to tp2 or 4 i did it wrong.

i still havent located a service manual for this model in case anyone has it.

[drpj23]

Re: Panasonic Plasma TC-P42U1 my first plasma

off topic- legally can a person open a refurb tv shop without a degree? either collect, fix, and sell.. or that and repairs for people. either way is there liability isues?

Yes, you can almost do anything you would like in the US business wise (free enterprise), but no certification may make new customers question you. Do be sure to have business license though or the IRS will be on you. Of course there is always the legal implications of a business you have to work yourself around (liability (what happens if you break a tv aka drop?) and implied warranty are a biggie) but I have my own repair business and I am still in college but I get repairs in based on recommendation. Honestly, TV repair intrinsically is really intuition and logic (sometimes lol). A, per se, EE degree, would only come in handy if you did component level troubleshooting but even then, all that information is on the internet.

[ryan74]

Re: Panasonic Plasma TC-P42U1 my first plasma

thanks for that info.
i have been thinking about doing more tv pickups from cl and selling but i would like to get a logo, buisness name, and a sign for vehicle so no open door shop for repairs. at least not yet. i have alot to learn. i want to leard component lvl diag. but i dont know how half the components work or how to test em yet.
if this keeps going well i want to get my business license after the first of 2013

i was ready to buy a sc board(above), had 1 picked for $75 but it appears to be power board.
generally if you have a blink code would youstart diag with that code or always check pb first?
i feel i wasted time following code first so i thought i would ask.

[tom66]

Re: Panasonic Plasma TC-P42U1 my first plasma

Well, if you posted a picture, we can highlight stuff and tell you which part is what.

[ryan74]

Re: Panasonic Plasma TC-P42U1 my first plasma

well i updated post 14 with pics earlier...lol. if you want more than pb let me know.