Panasonic TH-50PZ80U 7 Blinks

[tom66]

Re: Panasonic TH-50PZ80U 7 Blinks

I got two PZ80 - TH-42PZ80B and TH-46PZ80B.

IMO, the 46" is the best of the 42"~50" range because it has the 50" PSU and so can draw up to 630W, but is a little smaller so you get the brightest screen light. The 42" PSU can only draw 550W max so its max brightness is cut back quite a bit.

They are fantastic tellies when working.

Only fault I have had on these are cold solder on PSU & loose LVDS. My friend has done two others with 10 blinks and that's just a single cap on the MC201/MC301 packs.

[kevinm34232]

Re: Panasonic TH-50PZ80U 7 Blinks

Wow there is tons of repair services for those PS boards on ebay.. Is it just an SMD cap that goes bad or that IC?

[tom66]

Re: Panasonic TH-50PZ80U 7 Blinks

Just that cap most of the time, in rare cases the IC too, but mostly that cap only.

[capkid]

Re: Panasonic TH-50PZ80U 7 Blinks

Norcal715 on YouTube recommends replacing the ICs, also. If I remember correctly, he said that he's had at least one callback. The ICs are fairly cheap. I got mine from a reliable local supplier for $7.50 each.

I've done three of these TVs, one of which I sold, and I just replaced the caps on two of them; one of the two with cap replacements has been running fine for over two years. I decided to replace the ICs on the third one I just did for a little more peace of mind in case I wanted to sell it.

[kevinm34232]

Re: Panasonic TH-50PZ80U 7 Blinks

Which cap(s) go bad?

[capkid]

Re: Panasonic TH-50PZ80U 7 Blinks

Which cap(s) go bad?

There's a 1 mfd cap near the top of the MC201 and MC301 modules:

http://www.youtube.com/watch?v=LjpGKaBt8hg

[kevinm34232]

Re: Panasonic TH-50PZ80U 7 Blinks

I thought I'd share this tidbit of info..

I sold my A board to someone who had an otherwise working TV but no HDMI inputs would work, they just showed blank screen and no audio.

My board gave him same results.

I was upset about it because my initial problem just indicated a bad buffer board or due to a cracked screen, but I wasn't sure that I tested the HDMI ports for at least sound.

I decided to help and found the service manual, and realized that there was an HDMI3 on the front panel assembly, the GH board.

I realized this could be the common denominator and had him disconnect that connector (A11) from the main board.

This worked and HDMI1 and 2 started working. Obviously an issue with GH board.

Interestingly, whether it was some sort of surge or not, he never had used HDMI3 port, just HDMI1. And after we got this working he found out his receiver HDMI ports were fried too.

Either way good learning experience and saved him some $$..

[capkid]

Re: Panasonic TH-50PZ80U 7 Blinks

Interesting. Yeah, I'd forgotten about the third HDMI port at one point myself. When I sold one of these, I only put "two HDMIs" in my ad

[Seankla]

Re: Panasonic TH-50PZ80U 7 Blinks

So im trying to Isolate my SD/SU boards, but everything says to run a jumper between L801 and VF_Ground; However, I do not have a L801 on my SC board. My SC board is a TNPA4657 which does not have the L801 where all these diagrams for it show, so how/where would i connect this jumper to test these boards?

[tom66]

Re: Panasonic TH-50PZ80U 7 Blinks

Picture of board?

[Seankla]

Re: Panasonic TH-50PZ80U 7 Blinks

I have 7 Blinks BTW, and when i Disconnect SC20 and SC2 the TV stays on and no blinks, But with the SC board plugged in i get the 7 blink issue. I just ordered an SC board replacement, but i feel that the one i recieved is bad as well, because the problem is not solved. Any help would be much appreciated!!!

[Seankla]

Re: Panasonic TH-50PZ80U 7 Blinks

This is a picture of a board exactly like mine, except my board doesnt have a power coil in L416 but this one does, which is odd but besides the point. See how the layout is different than all the manuals show?

[tom66]

Re: Panasonic TH-50PZ80U 7 Blinks

Is this board from a model ending in "A", or "BA", or "UA"?

[Seankla]

Re: Panasonic TH-50PZ80U 7 Blinks

No it is just TH-50PZ80U, January 2009 is the date on it

[Seankla]

Re: Panasonic TH-50PZ80U 7 Blinks

Im sorry it didnt show it on the normal spot where the model # is on the back of the TV, But it is TH-50PZ80UA, it just says it on the bottom of the sticker, the Model# spot does not include the A, But the Manufacturer ID # includes the A

[tom66]

Re: Panasonic TH-50PZ80U 7 Blinks

Jan 2009 is a late model year for a PZ80 (2008.) I think it is rev A board. I am not sure where the test point is without having a look at schematics, which I don't think I have.

[Seankla]

Re: Panasonic TH-50PZ80U 7 Blinks



I just got a free service manual with all the diagrams and schematics in there. I dont know what makes the test point, but maybe you can get the same Manual and figure out which one is the test point?

[tw2005]

Re: Panasonic TH-50PZ80U 7 Blinks

So im trying to Isolate my SD/SU boards, but everything says to run a jumper between L801 and VF_Ground; However, I do not have a L801 on my SC board. My SC board is a TNPA4657 which does not have the L801 where all these diagrams for it show, so how/where would i connect this jumper to test these boards?

L801 is located in the middle of the board in between the 2 large heatsinks nearest the buffer connectors.

[Seankla]

Re: Panasonic TH-50PZ80U 7 Blinks

I thought i had looked everywhere on it. I cant believe i missed that. Im about to do the board isolation, and make sure that this SC board is bad. I think the replacement may have been just the wrong board with the same part number. That extra power coil at L416 must be a different revision of TNPA4657 or something, correct?

[Seankla]

Re: Panasonic TH-50PZ80U 7 Blinks

If when i power on the TV the Green LED light on the SC board comes on and stays on, does that mean my SC board is fine?