Re: Panasonic Viera Plasma TH-42PX75U 7 Blinks/8 Blinks/burned P board?
I know posting a second thread on the same issue is poor form, but I thought maybe I over-did it on details in my first post, and no one wanted to read it all. So I tried again with just the basics on a second thread.
Ultimately, the power board was a dead end. That diode was not testable with my equipment (and knowledge), and appears to be OK, despite the dark areas around the leads.
For posterity: The final solution, despite a few wrong directions, was a new D board and re-seating...
mmischni
Member
Last Activity: 11-14-2017, 01:13 PM
Joined: 09-06-2017
Location: Madison, WI
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Re: Panasonic Viera TH-42PX75U with 7 Blinks
A replacement D board was available for $24 from ShopJimmy, so I ordered one. Installing that gave me 6 blinks! Now I was getting somewhere. Using the 6 blink trouble shooting, it led me to re-seating connectors between the D and C boards, and between the two C boards. Believe it or not, that got things running. Ran it for 1.5 hours last night with no issues.
So for posterity, a new D board and re-seating connectors was the ultimate fix for my 7 blink code. It could be that the faulty D-board was confounding the on board...Leave a comment:
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Re: Panasonic Viera TH-42PX75U with 7 Blinks
Looks like the D board handles the following processes:[LIST][*]Format Converter[*]Plasma AI[*]Sub-Field Processor[/LIST]
Unfortunately I don't know exactly what those processes are. Do any of these sound like they would include on-board diagnostics? Only Board A with the microcomputer sounds like another possibility.
Thanks!- Re: Panasonic Viera TH-42PX75U with 7 Blinks
Looks like the D board handles the following processes:[LIST] - Format Converter
- Plasma AI
- Sub-Field Processor[/LIST]
Unfortunately
Leave a comment:
- Re: Panasonic Viera TH-42PX75U with 7 Blinks
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Re: Panasonic Viera TH-42PX75U with 7 Blinks
Any other ideas for me?
Is the D board the location of the on-board diagnostic circuitry? If so, maybe that would jive with what I am seeing. A fault on the D board maybe causing inaccurate blink codes, or otherwise confounding the diagnosis the TV gives. Maybe.
Thanks,
MattLast edited by mmischni; 09-17-2017, 06:34 PM.Leave a comment:
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Re: Panasonic Viera TH-42PX75U with 7 Blinks
So how about this? Once I disconnect the SC board, I get 8 blinks. If I use the troubleshooting flowchart for 8 blinks (attached), it leads me to the D board. TV still shuts down with the SS connectors and power connector removed and a jumper on P12. The Vsus voltage exists at pin 1 of P11.
What do the experienced troubleshooters think about the likelihood of a faulty D board being the root cause? It seems that something about this fault may be causing the TV to report a code that doesn't jive with the standard troubleshooting...Leave a comment:
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Re: Panasonic Viera TH-42PX75U with 7 Blinks
Thanks for helping out.
So the TV does not run with the SC board disconnected (two connectors, 1 power and 1 ribbon). I assume that means the buffers are also then disconnected, as they only seem to be connected to the rest of the system through the SC board. Does it tell me something to remove the buffers and turn it on with the SC connected and the buffers removed?
I tested all the Q components across the outer legs and none are shorted. Some have values in the 1800 range (is that ohms in the diode mode?), some have...Leave a comment:
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Re: Panasonic Viera TH-42PX75U with 7 Blinks
Hi. The upper left connector on the power board is P2. It goes to 195V before the TV shuts off. Vsus is supposed to be 194V according to the sticker in the TV. Continuity test at the SC2 connector flashes around 150ohms, then goes to "out of range" so it doesn't seem to be shorted at that point at least.
I agree the SC sounded like a common failure, and that is one reason I replaced it when replacing the SS did not help. But the troubleshooting guide makes it sound like if the SC is faulty (or the buffers, SU/SD),...Leave a comment:
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Panasonic Viera TH-42PX75U with 7 Blinks
Hello,
I have a Panasonic plasma born December 2007. It recently started giving the 7 blink error code. I followed the flow chart for 7 blinks (attached below) in the troubleshooting guide that I found for this model. With the SC board disconnected as indicated, the TV does not stay on, but instead gives an 8 blink code. I checked the specified voltages and both were present, indicating the SS board was the culprit. I tried a replacement SS board from ShopJimmy, but the problem was the same. A different SC board swap also yielded no difference.
When the SC board is... -
Re: Panasonic Viera Plasma TH-42PX75U 7 Blinks/8 Blinks/burned P board?
So I should probably put that diode right back in, as my diode tester probably isn't the right tool to know anything about that diode.
Any thoughts on the rest of the issues and how they have worked out in the trouble shooting?
Thanks!
MattLeave a comment:
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Re: Panasonic Viera Plasma TH-42PX75U 7 Blinks/8 Blinks/burned P board?
The back of the board looks ok to me. Picture attached, back side of diode highlighted. I realized that I was probably testing the legs of that adjacent coil device rather than the diode. I removed the diode from the board and it tests open in both directions. It says T2D79 on the diode. A Google search of those numbers didn't show much promising. I did find some options using the Panasonic PN (B0BB17000009). Prices ranging from $10 to $25 for one diode. While this doesn't offend me too much if I get my TV back,...Last edited by mmischni; 09-07-2017, 08:42 PM.Leave a comment:
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Re: Vizio LED Backlight Issue? Dark areas
P/N in this case is Part Number of those components. What numbers are printed on them?Leave a comment:
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Panasonic Viera Plasma TH-42PX75U 7 Blinks/8 Blinks/burned P board?
Greetings friends,
I have a Panasonic TH-42PX75U manufactured in 2007. It has been trouble-free until recently. One evening I turned it on and it then powered back off and gave 7 blinks.
First a question about the blinks. Everyone only speaks of a single number of blinks. I noticed on my TV, it blinks one fewer times for the first group of blinks, then blinks the full number repeatedly. So for my first code in question, the TV switches off, blinks 6, then blinks 7 repeatedly. When I disconnected the SC board, the TV switches off, blinks 7, then blinks 8 repeatedly.... -
Re: New Members - please post your introductions here
Hello, Matt from Wisconsin USA. I have been happily enjoying my Panasonic plasma since 2007, but now it is giving error codes. Lots of research led me here as a great place for info. After I read a bit more, I will post my problems and beg for advice!
Thanks!Leave a comment:
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