wg k7400 horizontal line (intermittent)

pun84

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Hi, I've got a K7400 27" that works fine when first powered up, but after several hours or longer the picture collapses to a horizontal line.

At first, I thought it was something loose.. but now it seems to be something more serious.. would it be the vertical IC chip that needs replacing?
 
Possibly, but if it works at all, then probably not. If it works, then collapses after it heats up, you may have a cold solder joint or cracked trace/lifted pad somewhere in the vertical section, possibly around the vertical yoke pins. Check around the caps especially...
 
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