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HR24 dying - can you tell me which part?

Discussion in 'DIRECTV HD DVR/Receiver Discussion' started by dan42353, Sep 7, 2012.

  1. Rich

    Rich DBSTalk Club DBSTalk Club

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    PC power supplys seem a lot simpler to troubleshoot than the power supplys on the HR24s, but I don't think it really matters (to me, at least), if the front panel lights don't work the PS seems to be bad. I've only replaced 3 boards, but all 3 boards turned dead 24-500s into working 500s. To me a ten minute job to fix something is better than spending hours troubleshooting components.

    I've done a lot of troubleshooting and it was always under pressure. Nobody cared what I did as long as I got the equipment running. I just never had time to "fix" a component part.

    Appreciate the explanation, that was a good analogy.

    Rich
     
  2. P Smith

    P Smith Mr. FixAnything

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    It's just a couple minutes: using your old good Fluke 25 and measure all 5(!) rails.

    It would cut any guess what happened: PSU or main board failed ?

    These LED are not for such diagnostics. They could, they could not lite up if PSU is partially dead.

    Remember - the LED are controlling by CPU, what is actually need one 3.3V rail, so if +5V or/and +12V is down, you'll see the lights, but your box will not functioning properly.

    Perhaps it was just your 'luck' - the model and its PSU are shows consistent point of failures. What would be good to know, but not good enough to spread over to all models and to other particular device.
     
  3. Rich

    Rich DBSTalk Club DBSTalk Club

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    I've got a feeling that if the front panel is dead on any of the 24s, the first place to look would be the PS board. Only takes a couple minutes to replace it if you have a good one on hand (and I do). Seems like a sensible approach to me.

    One more note, if I can't solder a connection with a blow torch, I don't want to do it. I had several nice soldering irons and other soldering contraptions when I was with the tools and I never used them. Not that I can't solder, I just don't like to do it.

    Rich
     
  4. bigglebowski

    bigglebowski Legend

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    Just wanted to jump into the general discussion of measuring power supplies. Computer power supplies (atx) can be easy to diagnose if you are familiar with shorting the green wire to one of the black wires which is essentially the power on switch for that type of power supply. Otherwise all you would ever have working was a single 5v lead.

    While I have repaired my fair share of receivers I havent really opened one since a D12. Even if the "rails" (never heard this term outside of PCs) are labeled that does not mean you will be able to measure them all unless the unit is fully up and working properly. In an "off" state usually there is only either a "stand by voltage" of 5v or 3v, if the lines are labeled one will be referred to as SB since it may have a separate 5v that has more current supply. So a line labeled 12v not working simply means that the "main" board has not given the power supply the command to turn on.

    If you know how to "force" the power supply into an on state outside of a receiver or a TV that does not mean under the normal load the 12v will be a stable 12v. Just like your car battery may read close to 12v on a voltmeter but when the heavy duty starter kicks in that voltage drops to a level that will not even spin the starter like in Ford trucks that have heavy duty starter motors.

    As P stated earlier I too would lean on the main board being the problem rather than the PS but that is why it really is a guess without actually doing some testing. For me the receivers I fixed over the years the older they were the power supplies were more common the newer ones were almost always the main.

    Whats unique in this instance is the device in question is almost never owned by the end user so finding a used one that you can just swap parts out of is rare. Then there is the fact that this is the newest simple DVR, so finding parts to fix HR20 models would be a more likely scenario.
     
  5. P Smith

    P Smith Mr. FixAnything

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    BL,

    You bring here little more noise then necessary ... If we will start discuss how PSU working for a eBook then it will be more complicated then you brought from PC world.


    FYI, DVR and receiver's PSU are working regardless on/off mode. So the PSU constantly holding all ralis/voltages.
     
  6. Rich

    Rich DBSTalk Club DBSTalk Club

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    I think the HR20-700s have an integrated PS with the motherboard. Don't remember opening any 21s.

    I don't really remember if the 24's PS has any voltage markings on them, I'll look the next time I open one of mine up. They (at least the 24-500s) don't have any voltage markings on them that I can remember. And they connect to the motherboard by many pin connectors. Don't remember seeing any voltage markings on them, either. They're just not like the PC power supplys. Every one of them I've seen had the marking on the wires. Not so on the 24-500s.

    Rich
     
  7. P Smith

    P Smith Mr. FixAnything

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    Don't worry Rich, this is pretty standard PSU, integrated or not; usually there are +3.3V/+5V/+9V or +12V, could be +7V, and +20V (for LNBF), also could be OVP line (not a rail, but a signal: +2.5V if it's normal ). You'll get it in no time, baby ! :)
     
  8. Rich

    Rich DBSTalk Club DBSTalk Club

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    No, I won't. No matter how much you push me, I'm not gonna sit down and dissect a PS. I'd rather just put a good PS in and if that doesn't work, I'll get a replacement. I can't imagine sitting down with that monstrous Fluke and picking apart a PS.... :lol:

    Rich
     
  9. P Smith

    P Smith Mr. FixAnything

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    No need make it more complicated then it is. ;)
    It will take a couple minutes to check 10 wires total. C'mon !

    You don't need "dissect" that !
     
  10. Rich

    Rich DBSTalk Club DBSTalk Club

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    Have you seen a 24's PS?

    Rich
     
  11. P Smith

    P Smith Mr. FixAnything

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    I would if you'll post a picture of it here. :)
     
  12. Rich

    Rich DBSTalk Club DBSTalk Club

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    And you already know I'm not gonna take a picture of it... :lol:

    Rich
     
  13. mobandit

    mobandit Hall Of Fame

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    Meanwhile....:backtotop

    Which was a question by an individual who was having trouble with his particular DVR...not a technical discussion of how a PS works...
     
  14. P Smith

    P Smith Mr. FixAnything

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    Tsk, tsk, tsk ...
     
  15. dan42353

    dan42353 Cool Member

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    The damn thing powered on and stayed on. It did this the 1 other time I left it unplugged for a few days but when I woke up the next day it was not working (making the rev-ing sound of fans and/or hd booting for a fraction of a second, then dying, then retrying). I'll have to wait until it fails to tell you if the lights on the front come on while it attempts to turn on.

    Rich, thanks for the link!

    P Smith, your more technical posts are what I thought I would find at this forum in the first place. Tomorrow if you still think its a good idea (after reading what I just said) I will figure out how to do what you have suggested.
     
  16. dan42353

    dan42353 Cool Member

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    I replaced capacitors on a monitor. I didn't know **** about it but it was such a common problem there was a guide I followed like a good monkey. IS there one for this?
     
  17. Richierich

    Richierich Hall Of Fame

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    What Link did Rich give you as I would like to have that Link also as I guided Rich to PSmith to get PS Info from him so can you share that Link with me also?
     
  18. Rich

    Rich DBSTalk Club DBSTalk Club

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    I didn't send him the link, Rich. I just told him I found a cheap working (supposedly, it is eBay, after all) 24-200 that he could buy and cannibalize for parts. It "probably" has a good PS. Worth a shot anyhow.

    Rich
     
  19. hdtvfan0001

    hdtvfan0001 Well-Known Member

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    That's OK I'm sure.

    The visual image of RichieRich doing "surgery" inside an HR24 would closely resemble a MASH episode most likely. :D

    [Did I just say that out loud....?......sorry RR]
     
  20. Rich

    Rich DBSTalk Club DBSTalk Club

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    Not gonna touch that..... :lol:

    Rich
     

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