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Colecovision Power Supply Repair (missing +5v)

Colecovision Power Supply Repair

Damn! the case Housing of the Power Supply is glued and is not a nice thing.

Defect:

  • +5v is missing.

Replaced components:

  • 1 x IC CA723CE (Precision Voltage Regulators)

Analysis of the defect:

  • Tested the cable.
  • Tested the transistor TIP41C soldered on the PCB.
  • Unsoldered the transistor TIP41C and i have again tested to make sure 100% that is not died, the transistor was not in short circuit or interrupted.
  • With the transistor TIP41C unsoldered i have tested the output of the IC CA723CE PIN 10 VOUT which appeared to 0V instead of +5v  while the input voltage (unregulated) PIN 12 measured +17v and VREF 6 PIN was correct.

Gallery of the repair:

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