My Poorly Einstein! It was not a well beast.
![](https://www.mikesretrotech.co.uk/wp-content/uploads/2019/04/BadScreen-MyEinstein.jpg)
Not sure what was causing the problem, I purchased 2 x multiplexers from eBay and removed the old ones, fitting the new ones into sockets.
![](https://www.mikesretrotech.co.uk/wp-content/uploads/2019/04/IMG_20190319_220333-507x1024.jpg)
![](https://www.mikesretrotech.co.uk/wp-content/uploads/2019/04/MultiplexersInSockets.jpg)
I guess the multiplexer replacements were unnecessary. The Einstein still would not boot!
I put a call out to the 8-bit community on Facebook and a nice chap replied who suggested that it could be the video memory that is faulty.
![](https://www.mikesretrotech.co.uk/wp-content/uploads/2019/04/videoDrams-1024x773.jpg)
With de-solderer in hand, I attacked the 2 smaller chips and replaced them with sockets and new old stock 4416-15nl chips from eBay
![](https://www.mikesretrotech.co.uk/wp-content/uploads/2019/04/IMG_20190417_214047-507x1024.jpg)
![](https://www.mikesretrotech.co.uk/wp-content/uploads/2019/04/IMG_20190418_190757-1024x507.jpg)
I now have a very stable Tatung Einstein. – Phew.
Retro Brite is the next stage, to make the keyboard and case look the part
![](https://www.mikesretrotech.co.uk/wp-content/uploads/2019/04/IMG_20190419_084637-1024x507.jpg)
![](https://www.mikesretrotech.co.uk/wp-content/uploads/2019/04/IMG_20190419_111636-507x1024.jpg)
![](https://www.mikesretrotech.co.uk/wp-content/uploads/2019/04/IMG_20190420_083536-1024x507.jpg)
I just need to get a metal sticker for the wrist rest, then its fully restored.
Next up .. GOTEK floppy drive replacement! 🙂