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I bought a MessagePad on eBay as "Broken, screen flashes" so I thought I'd give it a go in repairing it blindly...   First observations:  It's an Original OMP H1000; No sound, occasionally the display would show through, touchscreen is fine, faint mechanical ticking in sync with the glitching...

Now that looks slick.

Nice troubleshooting

Here's another project repurposing the CRT/case http://spritesmods.com/?art=macsearm&page=1

That's just silicone sealer to prevent possible arcing form the HV lead to the ground coating.  Not necessarily required and I don't remember any of my macs having it.  RTV silicone will do if you want.  It was common in TVs.

Just want to throw out there, I had a 128 with a similar problem and it turned out to be a blown & shorted diode in the HV circuit https://imgur.com/gallery/fYSUd

luckybob & I ran across each other when I posted my similar machine elsewhere, so for sake of posterity I'll relay my revival of this device:  (gallery here https://imgur.com/gallery/N6MXv ) ---- When first powered on upon receiving the machine I experienced exactly what lucky bob was.  No...

Base SE models tend to have a soldered-in battery, you will need to clip it out or otherwise desolder it. I like to install a holder on these to make future replacement a breeze https://imgur.com/a/qMnJF

Many times you can use a bright pen light, or flashlight and a pen or other object to cast a shadow wiggling it around a tiny bit to see where the light shimmers from the other side. Otherwise I just look for patterns in the vias (e.g. group of 3, a 4th about 1cm thaddaway)

Excellence!  What would your current unit price be? And housings?

Just finished recapping a CC yesterday and it wouldn't boot.  I resoldered any suspect points on the analogue board and checked the vias mentioned in here... Then I put a small 3V watch cell where the (dead) PRAM battery was... and it booted.  Yay!  This puppy is maxed at 10MB, i installed a...