Originally Posted by dmk11
To complete the story, I replaced the SU board, but 7-blink still happening. I think the technician was correct - the panel itself is bad and killed the SU board. So, if anyone wants to buy parts of my TV from me, let me know
Saw a good deal on ST30 TV, thinking of getting that as a replacement.
My Panasonic 46G20B (UK model) recently developed the 7 blinks of death fault. A few weeks ago now when watching the TV, what appeared to be crackling sounds came from behind the screen on the left-hand (where the HDMIs are) and then the picture vanished, to be shortly followed by the seven blinking red LED.
The repair man diagnosed a Scan board fault (but I already knew this as I had visited this thread!) However, as a matter of course this repair company replaces the two buffer boards as well as the Scan board. Apparently, this is because it's their experience that the buffer boards (which feed the signal to the panel from the Scan board) can cause the Scan board to blow.
I mention this because I was concerned that, like you, the fault on my set might have been caused by a bad panel. Of course, this would have made repairing the set uneconomic (and I was suspicious because the sounds I heard came from the opposite side of set to where the Scan board is). Interestingly, the repair man was emphatic that panel faults, where replacements are needed, are very very rare and he had only ever seen this where the screens were cracked - sometimes barely noticeable hairline cracks near the bezel.
He also added that picture quality was very unlikely to have been tip top with my old board, but I wouldn't have noticed this. He was right! When we switched the set back on after fitting the new boards picture quality, in terms of sharpness, colour, contrast and blacks, was much better than before - and is still improving. Don't get me wrong, although picture performance was impressive before, the performance I enjoy now is in another league altogether and entirely justifies the plaudits that many have given this set in both professional and user reviews.
For those people worried about the prevalence of this fault in newer Panasonic sets, don't. Our repair man repairs many sets from many different makers and when he tried to order the scan board for my set they didn't even have it registered on their stores system - a new part number had to be created!
The noises I heard coming from the left side of TV, was the sound of the relays cutting power to the boards to protect the TV and screen. Apparently there are circuit sensors here where power to the boards is monitored and can be cut if a fault is detected that requires the bad board to be isolated.
Finally, I am aware that you may well have already sold your TV for spares, so in this sense my comment might not be appropriate for you. On the other hand, for those who might be in this unfortunate position in the future, it may offer help and hope.