IBM 5155 - CRT Display Unit ("IBM Portable PC Display")
Photo
Click here
Connection to IBM CGA card
A photo showing the connection is here
IBM's technical documentation on the CRT Display Unit
1. Click on this link to get to the 'Options & Adapters' web page.
2. On that web page, click on the link named 'IBM Portable PC Display'
Removing the shield
Click here
Chip IC101
From 'Hugo Holden' of the Vintage Computer Forums, FEB2017:
There is an IC in these monitors labelled IC101 in the IBM documents with another number 221-88 or 86. The actual IC is a Horizontal sync processor & oscillator for the H scan circuits. The IC in these monitors I have, had their original labels deliberately inked over and a sticker applied on top. Looking under that, the IC has numbers printed on it that are 221-141 and L8420 which was probably the date and not a definite commercial part number. But, after a bit of research, I have concluded that this IC is definitely the Motorola MC1391P. This information might also help others repairing these vintage monitors.