I bought a used H20 Directv reciever. I plug it in and after a few minutes the resolution lights start scrolling. I understand this is part of the usual startup but the lights never stop scrolling. I can't get a light on the power button and the unit will not turn on. Anyone have an idea?
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reset the reciever by pressing the red button behind the panel on the front, as soon as you see letters on the screen during the start up process press 0,2,4,6,8 on your remote and that will force the download
those units are known to go out after not long at all try doing a front panel reset by pushing the red button where the access card is you may have to do it several times to see if it will finally come up if not your looking at buying a new receiver
I had a H20-600 that worked consistently until I unplugged it, then it would not power up unless the unit was warmed to its operating temp. (I placed it on an old iron radiator, warmed it up, it then powered up). The power supply on the unit had several failed, crowned capacitors (3300uf/10v). I pulled them, tested them (one was bad), and then replaced with good caps. Up the unit came. The PS in this unit is a switching unit and needs healthy caps to oscillate and create sub voltages. The standing heat in the unit makes the caps get hot, crown and leak. See any brown sputum on the top of a capacitor and it is on the road to failure.
unplug the power from the reciever for a few moments. plug it back in and let it load. once its finished turn to channel 201. Usually it the reciever is on an unavailable channel (channel with no programming) when it restarted it will go back to that unavailable channel hince the black screen and no sound.
I do not have an schematic for this receiver. This receiver might not use LM317 or TIP42C but a different voltage regulator, try to locate where the 20 volts line from the power supply and follow it to anywhere near the LNB tuner circuitry. This type of IC is normally mounted on a heatsink.
Lastly if you are a subscriber, give you satellite service porvider a call to get a replacement.
Check inside the receiver for a defective LM317 IC or a TIP42C transistor, but before that you should check for proper voltage from the power supply to that IC.
LM317/TIP42C control the switching of voltages that power up the LNB, you should be getting 14 volts for vertical channels and 18 volts for horizontal.