Rigol scope LCD problem

I would get inside and lightly probe with fingers, either final bond to the LCD failed somewhere or solder problem on a demultiplexer chip. If bond failure , do not try debonding and rebonding . That plastic reticulated foam, pan scourer, pressed against the suspect area and padded/braced against something is about all you can expect to remedy, unlikely to be zebra strip.

I wouldn't put it past them to have zebra strips in there how ever, since they can't use leaded solder any more in production items it's very possible you have a solder joint issue in the screen itself or it could be the header on your board.

Use circuit cooler on suspected areas after warm up to recreate the problem.

Jamie

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Thanks, I haven't taken it apart yet but I think it's just a PS, a mainboard and the front panel with the LCD, BNCs and buttons. I'm hoping a simple reseating will fix it. Thanks for the tips.

Good idea, but keep the cooler spray away from the CCFL lamp(s). I sprayed one while it was running and instantly cracked the tube. I don't know if this is a one-time problem, or is typical, but it might pay to be careful. Maybe a hot air gun (on low heat) when the panel is cool, or just massaging the circuitry looking for intermittents, might be equally productive.

Jeff Liebermann wrote in news: snipped-for-privacy@4ax.com:

I used to spray the cooler on a Q-tip swab and apply the swab to a suspect component I wanted to chill.

or you could rig some short of paper shield to keep the spray away from other parts.