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  1. Ed Sowell

    DVR power supply testing

    There's no connectivity though it.
  2. Ed Sowell

    DVR power supply testing

    I think I see a damaged resistor. At one end, there's a blackened spot that could perhaps be burned-off casing. The lead at that end is discolored where it emerges casing. Could this be the culprit?
  3. Ed Sowell

    DVR power supply testing

    Trouble is, I'm the only one who can see the components instead of photos and to me, the least able to judge, they all look good. What are the chances it's a different component that has failed, e.g., a transistor? Does 0 volts White to Red offer a clue? It should be 52 volts.
  4. Ed Sowell

    DVR power supply testing

    . It looks ok to me, but as I said I'm no expert. BTW, what is the blue component on the attached (daughter?) board? Small capacitor?
  5. Ed Sowell

    DVR power supply testing

    Steve, you have a lot more confidence in my soldering skills than I do. Thanks! But I'm thinking about trying. Turns out that the online offerings of a replacement PS assembly is "on back order".
  6. Ed Sowell

    DVR power supply testing

    I pretty sure we're looking at the same one, the second one below.
  7. Ed Sowell

    DVR power supply testing

    I see no bulging on any of the 5 capacitors. The semicircular brightness on the top at the right in the photo is probably an artifact... perhaps a reflection of the camera flash. My DVM doesn't have a capacitance setting, so all I could do is measure resistance. A quick look online suggests a...
  8. Ed Sowell

    DVR power supply testing

    Thanks. I find them listed, admittedly sometimes used. Yes, I can do that. The focus seems to be on capacitors. I've never tested a capacitor but willing to learn. I have a pretty good DVM, and a signal generator and oscilloscope (inherited). As owner of a '76 Jaguar, I've used the DVM a lot...
  9. Ed Sowell

    DVR power supply testing

    Sorry for the replicated photos. There's no feedback that the upload worked and I do it again to be sure. Is there a forum "how to" somewhere?
  10. Ed Sowell

    DVR power supply testing

    Ok, here's what it looks like inside. I see nothing that looks damaged, but I have little experience at this. One thing that is clear is Kellys_eye was right. White to Red is supposed to be 52v and Black to Yellow is supposed to be 12v, according to markings on the board. Since I measure 0...
  11. Ed Sowell

    Lorex DVR: What is this?

    There is power to the board, witnessed by heatsink fan and some flickering LEDs. The power LED on the front panel flickers, for example. However, since Black/Yellow measures 10.8v, it might not be high enough to run the CPU or whatever. Wish I know what those 2 chips under the heatsink were...
  12. Ed Sowell

    DVR power supply testing

    This is in regard to a failed Lorex LNR 4082 security camera DVR. One possibility is the power supply. See attached photo. The label says the DC output is either 12v or 52v. I suspect the former is for 120VAC input and the latter for 24VAC input. Don't know for sure. There are lots of YouTube...
  13. Ed Sowell

    Lorex DVR: What is this?

    Thanks. You're right. I would never attempt a repair at that level. But, I thought if someone recognized it and confirmed it would likely have died when the fan broke, I'd know for sure I had to find the board (unlikely) or pitch the whole thing. Sorry about the shaky hand on the camera. The...
  14. Ed Sowell

    Lorex DVR: What is this?

  15. Ed Sowell

    Lorex DVR: What is this?

    My Lorex LNR 4082 stopped working. Opening the case revealed a broken heatsink fan, which I replaced. Still no joy. One thought is it's because when the fan failed the chips under the heatsink got fried. Another possibility is the power supply is flakey. So, my first question is what are those...
  16. Ed Sowell

    Proper thermal pad/compound for DVR chip

    Thanks. Think I'll use the pad just to be safe. It worked that way for 3 years before the fan failed.
  17. Ed Sowell

    Proper thermal pad/compound for DVR chip

    I had to get a new fan for my Lorex DVR. the OE heat sink was set with a 25x25x1 thermal pad. I've read that a thermal compound is better that the pads, and I always us it when building a new desktop. What concerns me with using it instead of a pad is the DVR chip looks quite different than the...
  18. Ed Sowell

    Optical triggertesting

    Connected either way, the DVM shows no connectivity. IOW, infinite resistance. That is correct I didn't notice. BTW, I've ordered a replacement part. they are sending me an RMA. I appreciate your efforts. Thanks. Ed
  19. Ed Sowell

    Optical triggertesting

    The control module still responds to momentary shorting of 2 of the 3 wires that connect to the trigger, meaning the module is OK. trigger is about $35 plus postage. I am sure about the wiring. Can't be sure about initial state, but in normal usage the system has to be able to start from any...
  20. Ed Sowell

    Optical triggertesting

    I have an aftermarket electronic ignition system in my '76 Jaguar XJ-S. It uses an optical trigger over the edge of a slotted shutter disk in the distributor. The car recently died and I traced the problem the ignition, and a tests on the oil and the electronic control module showed them to be...
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