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Hitachi 42edt4a X-Sustain Buffer Board Plasma    
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My STD



Joined: 11 Dec 2009
Posts: 2
Location: Old Mort House

PostPosted: Fri Dec 11, 2009 1:52 am    Post subject: Hitachi 42edt4a X-Sustain Buffer Board Plasma Reply with quote

I have a Hitachi 42edt4a that develops a 1'' to 1/2'' black bar down the middle of the screen after about 1 hour of operation. The bar happens quicker in a setting where the TV is exposed to more heat, and less ventilation. As opposed to replacing the X-sustain buffer board (P/N: NA18106-5008) completely, is there any way I can demount the heat sinks, replace the thermal grease, and mount a cooling fan into the existing circuitry to fix this problem. I guess what I'm asking is, is this a bad buffer board, or the effect of a board getting too hot and shorting out temporarily? Come on super-scientists, make my day :)
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Jesse Mack



Joined: 22 May 2008
Posts: 600
Location: The Last Frontier

PostPosted: Fri Dec 11, 2009 11:53 am    Post subject: Reply with quote

You do not have a defective X-sustain.

If you have a black bar that is multiple pixels in width from top to bottom of set you will have a defective A-bus left or A-bus right depending on where the bar is located. If the bar is left of center as viewed from the front it will be a bad A-bus right (as viewed from the rear).

Hope this helps

Jesse
My STD



Joined: 11 Dec 2009
Posts: 2
Location: Old Mort House

PostPosted: Sat Dec 12, 2009 1:28 pm    Post subject: Reply with quote

Hey, thanks.

I've dug around looking for that component, and once I've found one, will I need to do any type of calibration to the TV?

Also, how much will this repair cost me in terms of parts, and how easy is it. Again, I really appreciate your help Jesse.
Jesse Mack



Joined: 22 May 2008
Posts: 600
Location: The Last Frontier

PostPosted: Tue Dec 15, 2009 11:12 am    Post subject: Reply with quote

The A-Bus boards are normally part of the panel. That being said you should first make sure the ribbon cables are properly secured between the logic and the A-bus and the A-bus and the panel. It is also possible for the panel to do this. If you wish to try replacing the A-bus (appropriate for the side in question) you can find the part number on a white sticker on the board itself - it will be something like (6871QRH037B or something similar)
Also, Look at your model number, I think you will find you missed a digit.

Jesse
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