(Topic ID: 233791)

Blackout GI Relay


By StratDoc

4 months ago



Topic Stats

  • 4 posts
  • 2 Pinsiders participating
  • Latest reply 4 months ago by StratDoc
  • No one calls this topic a favorite

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    #1 4 months ago

    The diode on the GI relay was bad so I replaced it but installed the diode backwards - big idiot move. Played a game and hit blackout and there was a pop from the backbox and no GI flash sequence. Checked the diode I replaced and it was bad. Installed a new diode - correctly this time - but did not resolved the issue. I checked transistor Q43 - controls the relay - and it checks out okay.

    Did I fry the relay? I wouldn't think a reversed diode would not do that but..... If so, can the relay be found or repaired?

    Thank you in advance for your expert advice.

    #2 4 months ago

    I rechecked Q43 and it indeed is bad. The original blackout driver board used TIP120 transistors. The Rottendog board uses a 13N10L. Can I use the TIP120 - I have several of these on hand.

    Thanks,

    #3 4 months ago
    Quoted from StratDoc:

    I rechecked Q43 and it indeed is bad. The original blackout driver board used TIP120 transistors. The Rottendog board uses a 13N10L. Can I use the TIP120 - I have several of these on hand.
    Thanks,

    Nope, the 13N10L is a mosfet and has to be replaced with the same. A tip120 wouldn't last a second when the blackout occurred

    #4 4 months ago

    Roger that. Ordered a few from Mouser.

    Thanks,

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