Tivo Series 3 - Bad capacitors in power supply

Discussion in 'TiVo Help Center' started by johnsom, Jul 25, 2011.

  1. Diogynes

    Diogynes New Member

    3
    1
    Dec 25, 2014
    My TiVo HD went into a boot loop, rebooting from the "Welcome!" screen. I couldn't get to the kickstart screen, so I tested the hard drive in a PC and it was fine. I had replaced every capacitor in another TiVo HD with no success so I was skeptical of fixing this one.

    This power supply had two bulging capacitors (2200uF at 6V). The voltages were all good, but since swollen or leaking capacitors are always bad, I replaced both with 2200uF 35V parts I had on hand. The TiVo works now.

    There are three positions on the PC board for these capacitors. The manufacturer had used the two closest together. I used the two furthest apart because the 35V capacitors are larger in diameter.

    Before the repair, the power supply DC voltages tested good with a DMM, with no measurable AC component. After the repair, there was no change in the measured DC voltages. I can speculate that the bad capacitors allow enough high-frequency ripple on the DC line to distort the data, but I did not test with a 'scope to find out before changing the parts.
     
    Last edited: Jun 14, 2020
    Teeps likes this.

Share This Page