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Panasonic TH-50PZ800U - Seven Blinks of Death   Goto page 1, 2  Next  
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hasselback



Joined: 27 Aug 2015
Posts: 13
Location: Saipan

PostPosted: Thu Aug 27, 2015 3:23 am    Post subject: Panasonic TH-50PZ800U - Seven Blinks of Death Reply with quote

Hello all. I have a TH-50PZ800U that will not turn on and will blink seven times. I see all kinds of conflicting information after a Google search. Does anyone have any reference material that will confirm what this is, or do you know? Also, how difficult of a repair would this be? I live on a small island in the Western Pacific and don't have access to a repair shop, so I'll be doing it myself.

All help/advice is appreciated!

George.
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JTS1957



Joined: 21 Jan 2009
Posts: 2242
Location: Far, Far Away

PostPosted: Thu Aug 27, 2015 4:42 am    Post subject: Reply with quote

http://imgur.com/6BfQ5Qr
http://imgur.com/1MWNJeV
hasselback



Joined: 27 Aug 2015
Posts: 13
Location: Saipan

PostPosted: Thu Aug 27, 2015 5:14 am    Post subject: Reply with quote

Thanks a million. This will get me started.

Can you explain the first slide a bit more? If I follow the flowchart on the second slide, when it says "disconnect" that is synonymous with "isolate" in the first slide? I'm pretty handy, but this is my first TV repair.

Also, to help me get oriented, can you provide a general diagram with all the boards identified?

Thanks in advance.

George.
JTS1957



Joined: 21 Jan 2009
Posts: 2242
Location: Far, Far Away

PostPosted: Thu Aug 27, 2015 6:05 am    Post subject: Reply with quote

Disconnect / isolate / float .. all same thing.

http://imgur.com/vCN4jdZ
hasselback



Joined: 27 Aug 2015
Posts: 13
Location: Saipan

PostPosted: Thu Aug 27, 2015 6:54 am    Post subject: Reply with quote

Thanks. I really appreciate the help.

G.
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hasselback



Joined: 27 Aug 2015
Posts: 13
Location: Saipan

PostPosted: Sat Aug 29, 2015 8:16 pm    Post subject: Reply with quote

Thanks for the help. I've started the flowchart, and run into a problem. The flowchart specifies that both the SU and SD cards should be "physically disconnected" at the same time. The previous slide that shows how to "isolate" the SD/SU cards seems to contemplate only one being "isolated" (disconnected/floated/whatever) at a time. Am I misunderstanding the flowchart, or is there some trick to disconnecting both cards that I am not appreciating?

Also, the flowchart contemplates a possibility of replacing the "D" board. Do you have a guide to doing so? While I'm at it, do you have a guide for replacing the SU/SD cards once I figure out which one is bad?

Thanks again.

George.
hasselback



Joined: 27 Aug 2015
Posts: 13
Location: Saipan

PostPosted: Sat Aug 29, 2015 8:32 pm    Post subject: Reply with quote

I thought about this for a while, and it seemed unnecessary to utilize the bypass in following the flowchart (as the flowchart just said "disconnect" and mentioned nothing about bypassing anything). So, working under this presumption, I followed the flowchart and disconnected the boards in the order it suggested. The process seemed to go according to what the chart anticipated, and it reached the result that I should replace the SC board. Therefore, I have a couple of follow-up questions.

1) Did I perform the diagnostic properly? Should I have been patching in a bypass while disconnecting the boards, or does "disconnect" in this context just mean "pull the wiring bundles when indicated by the flowchart?"

2) If I should have patched in the bypass when "disconnecting" the boards following the flowchart, how do I bypass both the SD and SU boards at the same time?

3) If I DID perform the diagnostic correctly, do you have a guide to replacing the SC board?

Thanks again, your advice is proving invaluable.

George.
JTS1957



Joined: 21 Jan 2009
Posts: 2242
Location: Far, Far Away

PostPosted: Sat Aug 29, 2015 9:20 pm    Post subject: Reply with quote

IF you can't unplug 5 connectors, connect an alligator clip jumper wire and take an ohm reading - I have my doubts.

IF you want to go out of order, so can I.
Reconnect EVERYTHING back to way set was.

Take a DVM and measure the resistance ACROSS SC2 by back-probing the CONNECTOR. With thin enough probes you should be able to connect to metal pins where the wire is crimped inside the connector. IF less than 100 ohms, unplug SC2 and measure ACROSS the socket pins on the SC BOARD.
hasselback



Joined: 27 Aug 2015
Posts: 13
Location: Saipan

PostPosted: Sat Aug 29, 2015 9:37 pm    Post subject: Reply with quote

OK...you lost me here. Seems we're working with vastly different experience levels. I'm unable to reconcile slide 20 which seems to contemplate "isolating" either the SU OR the SD board, and slide 21 which directs in the first step to "physically disconnect" BOTH of them at the same time. If "isolate" and "physically disconnect" are synonymous, I don't understand how slide 20's directions would allow me to disconnect both the SU and the SD at the same time.

George.
hasselback



Joined: 27 Aug 2015
Posts: 13
Location: Saipan

PostPosted: Sat Aug 29, 2015 9:45 pm    Post subject: Reply with quote

Pardon my inexperience here, but I think I figured out from where my confusion is coming. When isolating the SU/SD boards, I got the impression that you had to connect the jumper to BOTH the SU and SD boards. Upon further examination, it seems its an either/or instruction.

George.
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