Panasonic tc-p50s30 no power please advise!

[Georgia088]

Re: Panasonic tc-p50s30 no power please advise!

I tested it that way also I placed the ground probe on several places of frame, but this one was the easiest I could take a picture of .. I thought I attached it it earlier, sorry! Here it is:
Yes, the main was plugged in and I am getting 120v when probes are placed inside of "plug in". I swear I was getting 120 at p9 yesterday...

[Moreno83]

Re: Panasonic tc-p50s30 no power please advise!

Nah thats not possible. Think you measured it wrong.

On that connector the max voltage is 15V. Whats the part number on the mainboard? I got several mainboards.

[Georgia088]

Re: Panasonic tc-p50s30 no power please advise!

tnph0914 1a... I am saying I got 120v at the two prong connector coming from the "plug in".

[Moreno83]

Re: Panasonic tc-p50s30 no power please advise!

Yes that is good. Voltage in USA is 120V. Thats the primary side of the powersupply.

Ok , i will take that board for reference and hook it up to the same powersupply.

[Georgia088]

Re: Panasonic tc-p50s30 no power please advise!

The problem is I am not getting the 120v to that 2 prong connector any more. I get nothing... I think I should be getting 120v, but not sure.

[Moreno83]

Re: Panasonic tc-p50s30 no power please advise!

That would indicate that there is no power on the cable or you got a bad meter.

[Georgia088]

Re: Panasonic tc-p50s30 no power please advise!

Well, I don't think the meter is bad because when I check it at the "plug in" I get 120v... Can I bypass it and get 120v directly to that two prong connector at the ps board?
Thanks!

[Moreno83]

Re: Panasonic tc-p50s30 no power please advise!

You can use some plugs and plug it right in the board. On the white connector you should measure 120V AC. Im measuring 230v but thats because im from Europe.

The powersupply works without the rest of the boards connected but only provides 5V on pin 5 of P6.
You also need 5v on pin 1 from P34.

Thats the only voltage on P6. Rest is controlled by the mainboard.

[Moreno83]

Re: Panasonic tc-p50s30 no power please advise!

Ps , this is the white line on the board between ac and dc voltage.
On the primary side of the 6 optocouplers you must measure 47/48v. On the dc side its 4.8/5v.

Hope this helps. If all is there on your powersupply then your mainboard is dead. Make sure P34 is connected or it wont turn on at all.

[Georgia088]

Re: Panasonic tc-p50s30 no power please advise!

Thanks!! I will check these when I get home and let you know. Thanks again I really appreciate the help!

[Moreno83]

Re: Panasonic tc-p50s30 no power please advise!

No problem , its a great tv. Hope you get it working again and if you have any questions , just ask! It could take a while before i respond with pictures because of work/timezone etc.

[Georgia088]

Re: Panasonic tc-p50s30 no power please advise!

Ok. I connected 120 volts directly to the ps board. And then checked p6 and p34. I get 5v from the pins you described when connecting power directly up. Still no relay click, standby light or picture.

[Hombre]

Re: Panasonic tc-p50s30 no power please advise!

Now you can try to disconnect SC2 and SC20 to see is error the same as when they are connected.
But tbh it looks to me like main board problem (shorted cpu probably). so i would ask you if you can check resistance on A1 connector between pin3 and GND, while everything is disconnected.
Also IC5000 pin 28 and 29 resistance to GND.

[Moreno83]

Re: Panasonic tc-p50s30 no power please advise!

Hombre is right. You got a bad mainboard. 5V is present on the powersupply and the small ic on the mainboard has to turn on the powersupply.

New mainboard and the tv will turn on and hopefully wont give any other errors.
Ps , replace screws on SS/SC board with lockwasher screws.

[Georgia088]

Re: Panasonic tc-p50s30 no power please advise!

Thanks guys! I'm just a little confused now. When you say "see if error is same" what error am I seeing. I thought I was supposed to be getting 5v at p6 and p34. Forgive me for being stupid, but when you say resistance is this the same as continuity?
Thanks Again!

Ps also here is a close up of board number. I keep reading about suffixes. How would tell what the suffix is on this board?

[vinceroger69]

Re: Panasonic tc-p50s30 no power please advise!

ignore as these was wrong suffix code

[Hombre]

Re: Panasonic tc-p50s30 no power please advise!

I tought if you disconnect SC20 and SC2 maybe the state will change, so standby lighr coming on, but you already did that, so no need to do it again.
In resistance check you should set multimeter on ohms, 2k or 20k scale should be sufficient and then check those points.
As of revisions, i don't know, maybe 46s30 or 60s30 could work, but can't confirm it.

[Georgia088]

Re: Panasonic tc-p50s30 no power please advise!

I am not sure how to tell what the "suffix" is on these boards, but that board looks like it has the same "markings" in the suffix chart as mine... Thanks! Also, still unsure which 'error" Hombre is referring to. Thanks Hombre!

So to help me clarify, If I am getting the 5v from p6 and p34. the ps board is testing good. If the pins at p2 do not show short to ground or p11 don't show short to ground, then you would assume faulty main board? Is this correct?

[Georgia088]

Re: Panasonic tc-p50s30 no power please advise!

Ok, maybe I am wrong, but I was under the impressioin that the suffix had to be the same in order for a replacement board to work for these tv's. Is this correct? I am assuming my suffix based on the resistors on the suffix chart is AK... Is this not right?
Thanks!

[vinceroger69]

Re: Panasonic tc-p50s30 no power please advise!

ive never noticed that before thats new too me but i do see what you mean by the resitor codes