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3 x Texas Instruments TI-99/4a Repair

March 26th, 2023 Leave a comment Go to comments

Texas Instruments TI-99/4A Repair #1

Defect:

  • Black Screen and deafening sound in background.

Replaced parts:

  • 1 x TMS9900NL CPU (U600)

Texas Instruments TI-99/4A Repair #2

Defect:

  • Wave/Raster Lines.
  • Garbage on Boot Screen.

Replaced parts:

  • 1 x Inductor 2 -> 4.5 μH (L100)
  • 2 x TMS4116-15 RAM

Texas Instruments TI-99/4A Repair #3

Defect:

  • Garbage on Boot Screen.

Replaced parts:

  • 1 x MOSTEK MK4116N RAM
Categories: Projects / Repairs, Today, Various
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