Panasonic TH-PX60U is completely dead.

[ruatha65]

I 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?

At first, I thought the issue was simple (like you all haven't heard that one before!). My kids used the on button on the set often when the tv remote lost power, so i figured either the button itself had worn down or the switch board was bad. Button was fine, and I replaced the board, still no fix.

I tested the power cord, the wall outlet and the transformer, all are good.

AC relays did not click when power cord was put in, so went to step 2 on the troubleshooting guide, 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 guide, 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?

I had added this post to another thread, and TW2005 suggested that I start a new thread for others with similar issues in the future. Since I'm a newbie and just now allowed to start threads, here it is.

[ruatha65]

Re: Panasonic TH-PX60U is completely dead.

To update a bit on where I am so far, TW2005 posted a thumbnail that seemed to indicate the issue was a P board, but that may have been from a newer unit. He also provided some helpful Powerpoint tutorials, which included steps to take once a new P board is installed. At this point, I plan to replace the P board and see where that leads me. If anyone has any other suggestions or requires a photo of the open unit, I'd be more than happy to oblige..

[ruatha65]

Re: Panasonic TH-PX60U is completely dead.

I installed the P Board today and the TV is still dead. I'm going to try replacing the DG board, which is what the original troubleshooting flow chart told me was the issue.

[ruatha65]

Re: Panasonic TH-PX60U is completely dead.

Latest update: I installed the DG board today. Panasonic makes access to the DG so much fun (sarcasm)! They stack another bracket and circuit board on top of it.

After installation, I plugged the unit in and heard relays, for the first time since it died. Flipped it over and the on switch gave me a red LED (solid, no blinks of death). Used the remote and got an input display on the screen. Plugged cable box in, and got the best picture I've seen on it for years. That DG board must have been dying for some time.

Keeping fingers crossed, and I'll be monitoring it to be sure no other issues crop up while in use for a few hours, but it looks good so far.

Thanks Badcaps.net for all of the help. Specifically, the guides provided by Tom and TWC2005 were amazing and lead me to the fix. This is an awesome site that is now in my bookmarks. I was able to repair a plasma tv for about $160 (even including the P board I didn't need), so I saved at least $500-$600 on a new set. Not only that, but I enjoyed the challenge.

Thanks again everyone. What a great community!

[tom66]

Re: Panasonic TH-PX60U is completely dead.

Nice fix... I'm surprised you noted a picture quality difference - maybe the customer settings were different.... It can't otherwise effect the picture quality.

[ruatha65]

Re: Panasonic TH-PX60U is completely dead.

Two possible reasons for the picture quality, neither of which have anything to do with real engineering or electronics:

1. I was so excited that I actually fixed it that I saw more than what actually appeared on the screen.

2. It has been dead for so long that ANY picture looked perfect.

Oh, and the most likely reason is that I upgraded my cable service while the set was dead, so I had an HDMI capable cable box and used an HDMI cable for the first time on the TV.

[tw2005]

Re: Panasonic TH-PX60U is completely dead.

Or maybe you had a bad LVDS cable connection too?