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See I cant cross that part number and I have all the boards sitting in front of me. That number is the akai part number, but not the actual number of the board. There are 2 boards that they call main in the service manual, the main control board which actually drives the panal, and the "main video board" which handels the video inputs and on screen displays.
PCB failure analysis 1. MAIN CONTROL : a. Abnormal noise on screen. b. No picture. 2. MAIN (video): a. Lacking color, Bad color scale. b. No voice. c. No picture but with signals output, OSD
and back light.
If you can determine which of the 2 boards is the problem, I can sell you a new replacement for $125 shipped.
Basicall....Control board is no picture at all.
Main board is no picture, but on screen displays work.
Yes, I'm sure the board is bad. I had the TV checked out by a local TV repair shop. I also opened the thing up to see if I could do anything with it and it's obvious that this is the board that has bitten the dust. The correct number for the board is AA98-00188A. I made a typo in the first post.
Thats a real tough call on your problem as the set acts like its working normal and then gives out. It could be any number of things, but mostlikely somthing is drawing too much power causing a protection fault hence the power off. These types of problems are very hard to diagnose as the stuff your looking at looks good, its not until it warms up (even being a few seconds or so) that they go bad. You can allways put a meter on the VA and VS to see if there is a flucuation in voltage or even a spike and that could tell you possibly which board is the culpret, but the best is to replace and not repair as switching supplys can be a pain.
Depending on the location of the lines, like if they are in a group close to each other, or all over the screen they could be a couple of things.. If they are grouped in a certain quadrent of the screen, one of your buffer boards is bad, they run along the top and bottom of the screen and are cheap and easy to replace. If the lines are all over the screen, mostlikly the main control board is bad and will have to be replaced.. If that dosent fix the problem then your panal is shot.. Good luck.. Cheap parts on ebay.
It may be your serviceer does not know where to look for the parts. Akai is made by many different manufacturers and the parts for each manufacturer come from different distributors. I beleive your model is supported by Vance Baldwin