2 x Texas Instruments TI-99/4A Repair
July 18th, 2014
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Gallery of the repair:
Texas Instruments TI-99/4A Repair (#1)
Defect:
- Blue Screen with tiny Vertical lines.
Replaced parts:
- 1 x MCM6810P (128 x 8-Bit Random-Access Memory TTL/DTL)
Texas Instruments TI-99/4A Repair (#2)
Defect:
- Blue Screen with tiny Vertical lines.
- Wave/Raster Lines.
Replaced parts:
- 2 x IC MCM6810P (128 x 8-Bit Random-Access Memory TTL/DTL)
- 1 x IC CD3236A-NL (ROM)
- 1 x Capacitor 12 pF.
Note:
In one photo you can see the curious change made in this TI-99/4A by inserting a resistor in the pitch where in other motherboards is soldered a leg of a electrolytic capacitor and then one leg of the capacitor is welded and the not the other leg. Compliments.
Video of the defects:
Categories: Projects / Repairs, Today, Various
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