hello,
the vaio vgn-fz18 has some weird problem the lcd comes with red dotted lines and the the graphics becomes garbage unreadable with different colors all fz series have this problem does anyone know there is a service bulletin for this model with nvidia chip or anything with the clk generator as i remove the heatsink and clean the board it worked for 2 days again same error.
anyone ideas

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repairs of laptops and selling of components

It looks like video chip problem... Which video is there? 8400?
May you upload photoes to show the artefacts on screen?