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NFG Forums => Repair Division => Topic started by: raggio252000 on February 27, 2011, 11:50:27 PM

Title: PC ENGINE GT VIDEO PROBLEM(vertical line)
Post by: raggio252000 on February 27, 2011, 11:50:27 PM
Hi,

I have a PC ENGINE GT with a problem,there is a vertical line and it's difficult to play,I've replaced 1 video capacitors but the problem is the same,what can I do??

(http://www.retrosystem.it/images/IMG_5481.JPG)">
(http://www.retrosystem.it/images/IMG_5484.JPG)
Title: Re: PC ENGINE GT VIDEO PROBLEM(vertical line)
Post by: NFG on February 28, 2011, 08:42:04 AM
That's a pretty interesting failure.  It's almost certainly a problem with the screen's controller, or the connection from the controller to the screen...  I don't know if there'll be a fix for it.

Anyone else have an opinion?
Title: Re: PC ENGINE GT VIDEO PROBLEM(vertical line)
Post by: l_oliveira on March 02, 2011, 07:22:20 AM
These screens are based on a grid of "dots" where each elemet behaves like an transistor (hence the TFT name. TFT Means Thin Film Transistor) and obviously it has rows and columns.

By the look of the pictures it appears that the chip which controls the columns has a problem with that specific column.

It could be either the exciter output of the chip blew or the conductive film that connects the chip to the TFT glass broke, disconnecting that row... (now, that was a common fault with the original Game Boy screen).

Sorry to tell you that you will have to bear with that line. :(

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