IBM 5151  -  Known Problems/Issues

SYMPTOM:  No display

Possibilities follow:

• Faulty 5151.

To get any display at all (including simply a raster), the 5151 requires that a horizontal sync signal is coming into the 5151 from an operating MDA video card.
Therefore, the following are possible causes as well:

• Not connected to an operating MDA video card.
• Poor connection to operating MDA video card.  Includes oxide build-up on connector pins, etc.
• Faulty MDA video card.
• MDA video card has not been initialised.  (Example cause: 51xx motherboard switch settings set to EGA, instead of MDA.)