Panasonic with barcode picture

[DanKurts]

Older plasma TH50PHD3 set internally, sold as a Toshiba 50HP81. About 8 years old I think. Got it on a trade in for a new bigger set. It used to start up with a multi colored barcode picture for a few minutes, then slowly the picture would come in as the bars got fewer and be fine until the next time it started up cold. See enclosed picture. After a few months it got progressively worse until that's all it did, steady barcode picture. After leaving it on for an hour, it finally went into shutdown. Replaced the D logic board. Fires up again, but the barcode picture is steady now, normal picture never comes back. Hate to spend much more on it, but it made a great picture when it worked. First time it had any problems. Any ideas on what other panel it might be?
Thanks
Dan