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Horizontal lines via Component or Composite video connections

Discussion in 'TiVo Series3 HDTV DVRs' started by adamwsh, Aug 5, 2012.

  1. adamwsh

    adamwsh Member

    180
    0
    Oct 22, 2002
    Yup. Well aware. The trick is figuring out which things you are able to eliminate. Powering off the HDD is one thing I did not yet eliminate.

    I'm telling ya, I'm fully expecting the drive will be the cause of the problem. Only because I already went and bought an XL4 and paid for a lifetime subscription. I believe I'm able to return the unit to Best Buy and get my money back on the subscription as long as I do both within 30 days.

    If it turns out to be the HDD, I have to ask myself it is is worth the hassle of buying a new drive, doing the whole drive copy process, installing the new drive, hoping it fixes the problem, and if it it does then decide if I want to return the XL4 or not.

    Looks like used non-lifetime subscriptions HDs are going for only around $50 on ebay. That wouldn't even cover the cost of a new drive in the thing.

    If figured out it will take 40 months to pay for itself vs. renting a horrible DVR from Verizon.

    Like I said - UGH!
     
  2. HerronScott

    HerronScott Well-Known Member

    2,786
    27
    Jan 1, 2002
    Staunton, VA
    I'm also still leaning toward power supply or other grounding issue.

    Scott
     
  3. adamwsh

    adamwsh Member

    180
    0
    Oct 22, 2002
    Last night I disconnected the hard drive, connected only the composite video cable and power cord. I still saw the lines on the Welcome screen and the gray screen that followed it. So I guess it isn't the hard drive causing the problem. So I guess that leaves motherboard or power supply.

    Here's a picture of the power supply. I still didn't see any obvious signs of trouble.

    IMG_20120807_200401.jpg
     
  4. dlfl

    dlfl Cranky old novice

    6,997
    18
    Jul 6, 2006
    Near...
    The PS may have non-obvious problems. You should measure the 5V (red wires) and 12V (yellow wires) relative to gnd (black wires) where they are soldered to the PS board. WARNING SHOCK HAZARD.
     
  5. adamwsh

    adamwsh Member

    180
    0
    Oct 22, 2002
    I own a volt meter, but have no clue how to do what you're suggesting.
     
  6. dlfl

    dlfl Cranky old novice

    6,997
    18
    Jul 6, 2006
    Near...
    Well you know how to get to the PS since you sent a photo of it. See how all the black/yellow/red wires are soldered to the board. I believe there are labels on the board near these points (5V, 12V and GND).

    Be careful not to touch anything but the designated pads with the probes and do not touch anything inside the TiVo with your fingers (or nose ;)).

    Set up your voltmeter to read DC voltage.
    Connect the TiVo power.
    Hold the black (-) meter probe on the GND pad (where the black wires all go).
    Touch the red (+) meter probe to the 5V pad (where all the red wires go) and read the voltage.
    Touch the red meter probe to the 12V pad (where all the yellow wires go) and read the voltage.

    The 5V reading should be between 4.75V and 5.25V.
    The 12V reading should be between 10.8V and 13.2V.
     
  7. unitron

    unitron Active Member

    16,389
    2
    Apr 28, 2006
    semi-coastal NC
    A better, safer way to do that, provided your meter has probes with metal coming out of the end that are like big needles is to stick the black one down into the plug on the motherboard in a hole where a black wire goes, being careful not to let it touch anything else, and then with the meter set for something like 0-25V DC, stick the red probe down into a hole in that plug where a red wire goes to check the 5V line, and then into a hole with a yellow wire to check the 12V line.

    Orange should read about 3.3V


    Usually the bad cap likes to hide underneath that heat sink overhang where it's hard to see and hard to remove and replace when unsoldering the old one and soldering in a nice new reputable brand high temp, low ESR replacement.


    If your black meter lead has an alligator clip, anywhere on the metal chassis should do, preferably someplace not near any of the circuit boards in case it slips off.
     
  8. unitron

    unitron Active Member

    16,389
    2
    Apr 28, 2006
    semi-coastal NC

    Yeah, that looks like the one in my HD.


    Shine a bright light under that heat sink overhang.
     
  9. unitron

    unitron Active Member

    16,389
    2
    Apr 28, 2006
    semi-coastal NC
    One other thing, if the power supply is regulating properly, those voltages should read about the same with the hard drive connected or disconnected.
     
  10. adamwsh

    adamwsh Member

    180
    0
    Oct 22, 2002
    I haven't had a chance to do the voltage test yet, but I do have the TivoHD connected to the TV still, and it hasn't acted up at all today. WTH!?
     

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