Panasonic TH-50PX60U 7 blinks

[HooF]

Hello, I have the above plasma TV.

Blinks 7 times.
The first time you power it on after it has been off a long time it appears to power up. Stays on for 10 seconds. Sustain boards LED's come on. Fans run. Then it turns off.

After that even if unplugging it and plugging it back in then it happens much faster. 2 seconds.

I can't find any damaged parts. No blown parts on Sustain etc. I have isolated the two driver boards and still have the 7 blinks.. I have tried the freeze spray, physical stress I just can't see to find the bad part. No bad caps of any kind that I can see. I don't want to just order a power supply board and pray.

Has anyone seen this? Have advice?

[tom66]

Re: Panasonic TH-50PX60U 7 blinks

Note -- If you isolated the drive boards you MUST jumper SC50 to disable the 7 blinks chassis detection problem. Then you can determine if it is SC or driver problem.

[HooF]

Re: Panasonic TH-50PX60U 7 blinks

searching for SC50 now. Did not know that. This is my first Panasonic.

[HooF]

Re: Panasonic TH-50PX60U 7 blinks

I am not finding a SC50 on the SC board. Will go up and look again.

The SC board TNP A3827

[tom66]

Re: Panasonic TH-50PX60U 7 blinks

Ah, it may be an older SC, for which there is another technique.
http://www.tgohome.com/ServiceManual...PZ85U_[TM].pdf

Page 63.

[HooF]

Re: Panasonic TH-50PX60U 7 blinks

It appears that to isolate the SC board on this model "I am not totally sure that manual is close but not exact" you just unplug the sucker.

[HooF]

Re: Panasonic TH-50PX60U 7 blinks

I pulled the SC board and checked power transisters, FETs and Diodes. Everything good. No shorts. Board not shorted to ground. The SC board appears good at first glance. I am stabbing in the dark on this thing.

[t.j.]

Re: Panasonic TH-50PX60U 7 blinks

he is the one for your model! an i did not see sc50 jump! but does show test points for all the boards!

[HooF]

Re: Panasonic TH-50PX60U 7 blinks

Thanks t.j. I am reading it now..

I did try the following..

It appears that to isolate the SC board on this model "I am not totally sure that manual is close but not exact" you just unplug the sucker.

Pulled and checked the following boards and checked for shorted components

P
SS
SC
SU & SD

I have found NOTHING! Gasp......

Additional note.. I did pull the data lines to the SC board and the error code went away and the unit would stay on. Also when watching the unit the screen starts to come up "I can see the black screen begin to light up in the dark.. And the instant that happens it shuts down. The 10 seconds the first time power on generates the same issue. So I am failrly certin that has nothing to do with anything.

[HooF]

Re: Panasonic TH-50PX60U 7 blinks

t.j. Do you simply have the file. That site wants to install a downloader and is trying to hijack my pc with Yahoo!

[t.j.]

Re: Panasonic TH-50PX60U 7 blinks

no scroll bellow the pic of pdf, it will say prossesing , then get manual!

[HooF]

Re: Panasonic TH-50PX60U 7 blinks

They are some sneaky crap heads.. I just spent 30 minutes cleaning trash off my pc!
Downloading now! Gawed!!!!!!


That manual is awsome! It shows everything!!!!! It's a matter of time now before this thing is getting fixed! I sure wish it was something that people have encountered before. It's a real stinker.. I can't wait to see exactly what it is.

[HooF]

Re: Panasonic TH-50PX60U 7 blinks

SOS signals. I am measuring the SOS6 and SOS7 signals from the SC board. They both jump to around 2.5v just before shutdown. I see no difference between them. I was reading a pin guide and it would appear that they are supposed to be at 0.

Does anyone know if I am chasing a rabbit hole here?

[HooF]

Re: Panasonic TH-50PX60U 7 blinks

OK I gave up and ordered a SC board. Sure wish I could of found the bad part. I will post results.

[awyatt2]

Re: Panasonic TH-50PX60U 7 blinks

try and heat (used hairdryer) the caps on the sc board near the bottom end below the heatsinks they would be between the heatsinks if the heatsinks were long enough . i did this on a 7 blink setand found problem then verifed with an esr meter. after 6 yrs a cap is entitled to be a little bad. these sets go back around 6 yrs.

[ruatha65]

Re: Panasonic TH-50PX60U 7 blinks

Sorry if I'm hijacking this thread, but I also have an issue with my TH-50PX60U. It is completely dead. No lights, no blinks, just kaput. I found a troubleshooting manual that Tom66 had posted, and it led me to either a bad P board or bad DG board. Here is the quandry, which board is it? AC relays did not click when power cord was put in, so went to step 2, which was to test if either pin 1 of PA40 or pin 1 of HC22 had 5V. PA40 had 0V, but HC22 had 5V. The problem is, HC22 had nothing plugged into it.

According to the chart, if I answer the "or" proposition above with a "yes" since one of the two had 5V, it's the DG board. If the answer is "no", it's the P board. My question is, does it matter that HC22 connects to nothing at all? Simply because it has 5V and PA40 has nothing, should I assume it's a DG board?

[tw2005]

Re: Panasonic TH-50PX60U 7 blinks

What guide are you using? I'm looking at the technical guide 9th gen

[tw2005]

Re: Panasonic TH-50PX60U 7 blinks

Actually, it would be better to start a new thread with a title that relates to no power rather than a 7 blink. helps someone else down the track if they do a search.

If you open these but don't run as a presentation , you'll see the notes the presenter would be reading. This is all based on the PD/ PX60, PX600
series

Course 1
PCI PCB Recycling Program/Process
Model line-up/PC board functionality

Course 2
PCB Recycling Component Level Repair Techniques

Course 3
Understanding How System Shut Down Operates

Course 4
Troubleshooting Hints / Common Symptoms

[ruatha65]

Re: Panasonic TH-50PX60U 7 blinks

What guide are you using? I'm looking at the technical guide 9th gen

I must have been looking at an older guide. According to your thumbnail, my issue is clearly a bad P board, as there are 0v at pin 1 of PA40.

I'm apparently so new to the forum that I cannot yet start a new thread. I will be more than happy to do so once I'm allowed.

I haven't yet looked at the guides contained in your second post, but I will, just to be absolutely certain my diagnosis is correct.

Thank you for the quick and on point advice!

[ruatha65]

Re: Panasonic TH-50PX60U 7 blinks

Unfortunately, the repair courses you provided have a file extension I can't open. Tried to unzip them, but no luck. Unless you believe I'm wrong in my diagnosis of a bad P board, I'm going to go ahead and order a replacement.