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Rigol scope LCD problem

DS5102C, color LCD scope. When turned on, the leftmost quarter has vertical stripes, the affected column is dead.

It looks like specific sub-pixels are not responding. R in one row is dead, then G a few rows down, then B, repeat 10 times.

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Thing is, after a few hour warm up, it works normally.

What is the most likely suspect before I go in and strip it down? Is it likely to be simply a bad harness somewhere that needs reseating? Or do I need to take apart the panel and fiddle arround with something more arcane?

I don't think there's zebra strips in these things these days.

Reply to
a7yvm109gf5d1
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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.

Reply to
N_Cook

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

Reply to
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.

Reply to
a7yvm109gf5d1

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 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558
# http://802.11junk.com               jeffl@cruzio.com
# http://www.LearnByDestroying.com               AE6KS
Reply to
Jeff Liebermann

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.

--
Jim Yanik
jyanik
at
localnet
dot com
Reply to
Jim Yanik

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