1983 Seville transistor replacement on A/C Power Module
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 1983 Seville transistor replacement on A/C Power Module in Past Cadillac Vehicle Discussion; Hey all, Thanks to this forum, I learned about this nifty mod that can save you hundreds of dollars. I ...
  1. #1
    andrewgorny is offline Cadillac Owners Member
    Automobile(s): 1983 Seville (standard)
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    1983 Seville transistor replacement on A/C Power Module

    Hey all,

    Thanks to this forum, I learned about this nifty mod that can save you hundreds of dollars.

    I pulled out the old transistor and am ready to put the new Sylvania ECG-130 in. Anyone have soldering tips for this delicate maneuver?
    Do I half-insert the pins, melt some solder and push the thing in? Or drop solder in? I've only ever soldered wires, so any help is much appreciated.

    For those of you who are electronics savvy but are unfamiliar with the setup, here's a pic:

    powermod.JPG

    Thanks yall in advance
    -Andrew

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  3. #2
    mhamilton is offline Cadillac Owners Connoisseur
    Automobile(s): 2006 XJ8-L, 2000 Eldorado ESC--total loss :(
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    Re: 1983 Seville transistor replacement on A/C Power Module

    Ideally you want to remove all the old solder from the PCB with a solder sucker or some braided wire. Then insert the new transistor into the PCB fully, solder the new pins to the traces.

    If you have to, install the new transistor and melt the old solder on the PCB to get the pins installed fully. Don't over-heat the transistor; quickly heat and solder, you don't want to burn the new chip.

    From the picture, it looks like that PCB is potted? Do you have access to the underside of the board?

  4. #3
    andrewgorny is offline Cadillac Owners Member
    Automobile(s): 1983 Seville (standard)
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    Re: 1983 Seville transistor replacement on A/C Power Module

    no access to the underside of the board.

  5. #4
    andrewgorny is offline Cadillac Owners Member
    Automobile(s): 1983 Seville (standard)
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    Re: 1983 Seville transistor replacement on A/C Power Module

    Well, I can't figure out how to get the thing soldered. The wires coming out of the transistor go pretty deep through the heatsink to the other side (which I can't for the life of me figure out how to get open so I can see the other side). There's a compatible car at the u pull it in town here and I guess I'll see if the power module is still in the car.

    Thanks anyway for your help!
    -Andrew

  6. #5
    mhamilton is offline Cadillac Owners Connoisseur
    Automobile(s): 2006 XJ8-L, 2000 Eldorado ESC--total loss :(
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    Re: 1983 Seville transistor replacement on A/C Power Module

    Yeah, unless you can get the potting out then you won't be able to re-solder that transistor. If it was asphalt potting compound it would melt out at ~120C. But that looks like some sort of epoxy. You'd have to dig it out mechanically, it would be a mess.

    Sorry that didn't work out for you. Hopefully the pull-a-part will have what you need!

  7. #6
    andrewgorny is offline Cadillac Owners Member
    Automobile(s): 1983 Seville (standard)
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    Re: 1983 Seville transistor replacement on A/C Power Module

    It doesn't matter anyway, I cannibalized a spare from an 85 Seville at U-Pull and the blower still doesn't turn without the grounding test. So I guess I'll just have to buy some testing gear like a light and see if I'm still getting signal or if I snagged another burned out unit.

  8. #7
    omston is offline Cadillac Owners Member
    Automobile(s): 1985 Seville
    Join Date
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    Re: 1983 Seville transistor replacement on A/C Power Module

    cut an acsess hole on the top side above the transistor razor knife out the soft gel type material use desoldering wire to remove the solder holding it in use a soldering iron to solder the new one in.

    ----------

    If the motors drawing to many amps thats what burned the first one out if you didnt replace the motor to it could have burned the new transistor. Solder an inline fuse on the power wire going to the motor if it blows you need a new motor too.

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