Panasonic Plasma TH-50PZ800U power supply light 2 blinks

[Sevenqi]

Panasonic Plasma TH-50PZ800U some times turns on and works OK , even many hours has no problem, but when I turn it off, then it sometimes can't turn on with power supply light 2 blinks, the blinks stop 1-2 seconds and repeat, then it can't control any more both using remote control or the power button, I have to unplus the power cord to stop the blinkings.
Looks like hard to detect the root cause as some times it works fine, most times not power on. Any one can help ?
I got the error code from Panasonic that 2 blinks is 15v SOS D-Board, but some one did replace the d-board still the same problem.

[tom66]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

I believe this is caused by a single failed MLCC ceramic capacitor on the power supply boards MC201 or MC301. Can you open your TV up and take a picture of the PSU? (It's the board which connects to the mains - trace the wiring.)

[Sevenqi]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

Thanks for your quick reply, I'm not at home now, I'll take a photo tonight.

[drpj23]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

The usual failure is what tom66 said but it can sometimes be the D board (as you've tried) or A board. It also can be just about any other board but P, D, and A board have priority in a sense.

[DavidOH]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

This may help.

http://www.scribd.com/doc/46124232/T...GPH11DU-Chasis


http://www.scribd.com/doc/24963802/1...Plasma-Display

[Sevenqi]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

I watched this video and did the cold spray to the ic, it could start, once I powered off, the same problem repeated.
http://www.youtube.com/watch?v=LjpGKaBt8hg

So I ordered the ics and is waiting for the ic to replace.

[Sevenqi]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

Finally I fixed it.

I only cool the ceramic capacitor on the power supply boards MC201, it could power up, so that cap is bad cap.
I bought 10 common 1uf 50v capacitors for 1 dollar, and use 1 to replace the bad cap. It's hard to sold because it's too small, I almost damaged the curcuit, so I use two soft / small wires to link to the new cap as show in the photo, and it works fine !

[mr.sky]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

Glad you got it fixed.

[bluto]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

What is the consensus on what type of cap to use for this? Some are using a 1uf 'lytic. On the AVS thread one guy strongly advocates 50v Polyester film (of the Panasonic ECQ-V or ECQ-B series) These are non-stocking at DigiKey. The only 1uf Polyester caps they do stock are 250v which are ginormous. Can I just use a couple of generic 1uf 35v orange drop caps that I have in stock already? Or just use a 50v 105c 'lytic and be done with it?

[rsina]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

According to Norcal that made the youtube repair video, this cap only needs to be 15+ volts so I believe your 35v caps would be fine.

I'm wondering how to tell if it the cap that is bad on the Mc201/Mc301 boards or if it is the TEA1611 IC and the cap that need to be replaced? Is there any test that would tell me or should I just replace both and be done with it? If it is just the cap that is bad, I'm going to try and repair without removing the board. If I need to replace the IC, then the board needs to come out. Hope some one has an easy test since there have been so many of these PS boards repaired on the Panasonic Plasma's.

[DavidOH]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

It's easier to fix if you take it off.

[DavidOH]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

Didn't mean for it to be that big.

[Sevenqi]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

I got another model PANASONIC TH-50PZ85U, the same problem: when I press the power button, 2 blinks.
I didn't bother to take the power supply unit out, instead, I solded out the small cap and replaced with a 1uf 50v cap as shown in the pictures,
tv works perfect now.
SO it looks like these serious tv power ssupplies have this common issue, you only replace the cap, not the ic.

[caphair]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

How are you replacing these with electrolytic caps? Won't polarity matter? Going by that ceramic caps have no polarity

[Sevenqi]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

How are you replacing these with electrolytic caps? Won't polarity matter? Going by that ceramic caps have no polarity

This cap is in MC201, it should have polarity. I replaced this kind of caps for two TVs with the same issue, it works.

[rsina]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

Does anyone know what problems to look for when getting a 3 blink error on the TH-50PZ800u? I have replace the A and D boards according to the repair manual but I still am getting the same 3 blinks when attempting to power on the TV.

Any ideas?
Rick

[tom66]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

Some service guides may help:
http://www.tgohome.com/ServiceManual...&Search=Submit

[TajMan]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

46" plasma, ETX2MM704MG-H power supply
I had the 10-blink problem
.
.
I bought a $15 auction on eBay which included 2 new microchips and 2 surface mount capacitors. I spent a good bit of time, soldered everything on (MC201 MC301), thought I may have messed circuits up but then may have fixed.
Tested, still the same 10-blink problem

I sent the board off to a eBay seller who offered a repair service for $92.

I got the board back in the mail today, re-installed and tested.
Still no turn-on, this time just 2-blinks after you press the power button.

Carefully inspecting board MC201, I Thought I saw where the capacitor was missing from a previous fudge-up of mine, the positive contact for that capacitor is basically missing from the board.
.
.
Seeing where those 2 contacts go, I thought I could solder negative of capacitor to the top left pin on micro-chip, and positive to the 3rd pin down from top on left side of micro-chip.
Capacitor soldered on carefully with wire leads to extend, I seem to have done a fine job didn't bridge any contacts
.
.
Still same 2-blink problem after I push power button, didn't fix it yet.

[Sevenqi]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

Please also check if you re-installed all the connector cables properly to it's original positions, expecially the cables inside the digital board.

[kilo6490]

Re: Panasonic Plasma TH-50PZ800U power supply light 2 blinks

just came across this and joined cause my panasonic is having this issue. TH-50PZ80U. was watching netflix one night and just shut off with 2 blinks. Got a new power supply board and installed it, plugged it in and now 10 blinks. Could it be the 301 cap even if the board is NEW??