420 RE Unmodded,lite comes on then wont turn on..

[total92000]

.......When I plug it in,lite turns on briefly then shutd of like normal but when I turn on power w/ button nothing..If I press info and right arrow buttton(s) for 6 seconds light comes on again briefly. This IRD has not been modded. Any suggestions....


Thanks....

[Grasshopper2Ant]

.......When I plug it in,lite turns on briefly then shutd of like normal but when I turn on power w/ button nothing..If I press info and right arrow buttton(s) for 6 seconds light comes on again briefly. This IRD has not been modded. Any suggestions....


Thanks....
Test the diode at location CR14108. If it has continuity one way only, it is good . If it has both ways, replace. I have seen other posts regarding this here so search for more info. Good luck.

[junkinthetrunk]

I have the same problem except my receiver is no-zkt modified. If anyone has anymore detail on this problem or can give me some insight on how to fix this, I would be very appreciative.

thanks,
junkinthetrunk

[Grasshopper2Ant]

Same diagnosis and repair as above. The part is:CR14108 - ST BYW100-200 Fast Recovery Rectifier Diode. Clip it out above the board and patch the new one in or take the board out and desolder,clean holes and solder in diode.
If your unit was flashed with no zkt and it had the problem right away you may need to reflash or disconnect BFR to Ground if still connected. Let us know your results.

[junkinthetrunk]

Same diagnosis and repair as above. The part is:CR14108 - ST BYW100-200 Fast Recovery Rectifier Diode. Clip it out above the board and patch the new one in or take the board out and desolder,clean holes and solder in diode.
If your unit was flashed with no zkt and it had the problem right away you may need to reflash or disconnect BFR to Ground if still connected. Let us know your results.

Any idea where I can get the part from a Canadian electronics company?

Also, any special way to take out the board without busting everything? What exactly is holding that board so tight to the box?
And I'm also unsure of the part. I see something which looks like a black resistor that shows CR14108 just below it. What exactly is ST BYW100-200 ? Is that just the exact name of the part?
thanks,
junktrunker

[Grasshopper2Ant]

Plastic tabs on the sides and front hold the board. Sound like it may be better to patch it in by cutting it out on top. ST is the manufacturer . Digikey in Canada has them: Part: 497-2510-1-ND . They also have all the specs. There is a NTE make sustitute which I will post if I find the exact numbers.

[blankpage]

The NTE number is NTE587, replaced mine yesterday and it works great. Thanks for the help Grasshopper2Ant.

[blankpage]

Active Electronics also carry these parts. ***Active123.com

[junkinthetrunk]

Same diagnosis and repair as above. The part is:CR14108 - ST BYW100-200 Fast Recovery Rectifier Diode. Clip it out above the board and patch the new one in or take the board out and desolder,clean holes and solder in diode.
If your unit was flashed with no zkt and it had the problem right away you may need to reflash or disconnect BFR to Ground if still connected. Let us know your results.

I took the part needed from an old rca420 that I had lying around. Maybe I should have tested the part before taking it and putting it in the receiver in question. Anyhow, I replaced it and plugged in the receiver and the receiver caught on fire. Oh well, I guess I'll be more careful next time.

thanks anyway,
junktrunker

[total92000]

whooo!!!!!

[leebo]

Replacing a bad diode with a bad diode will not smoke the receiver, however, operator error will.
leebo

[junkinthetrunk]

Replacing a bad diode with a bad diode will not smoke the receiver, however, operator error will.
leebo

What do you think I could have done? All I did was replace the part mentioned.

junktrunker

[skinerd]

What do you think I could have done? All I did was replace the part mentioned.

junktrunker

Possibly installed backwards? Cr14108 installs backwards compared to all the other diodes close to it.

[hoser]

What if the the diode at Cr14108 is good? I have the same problem on mine and the light turns on for about 1 second and then turns off.
Is there something else I should look for or test when the Cr14108 is good? Reflash maybe?

Thanks in advance

[skinerd]

You sure CR14108 is good? What is the output voltage on it?

[hoser]

I have two 420's with the same problem. One voltage was was 4.56 or something and the other was 3.99 which I thought was kind of low compared to others I have tested. When tested the other way I was getting 0 voltage or OL, What do you think?

[skinerd]

CR14108 should have an output around -13v (measure to ground and the side away from the transformer), it supplies the -5v regulator, the one with a heat sink around it, the regulator should have -13v in and -5v out. those are negative voltages. If CR14108 is low, then either it or the regulator are bad.

[hoser]

Skinerd. Here are the readings I am getting off of the CR14108 diode.

First receiver: -13.85 out
Second receiver: -14.46 out

Not sure which regulator you are talking about. Is it C14115?

[hoser]

This is weird! After checking the voltages as stated above. I noticed that the led light came on, and stayed on. I can turn off and turn on the receivers as normal. I hooked up the receivers to satellite cable and I am receiving a strong signal on all transponders on one receiver, and no sat signal on the other. Checked the sat in voltage and there is no voltage between 13v and 17v. That is another problem I will deal with later.

Here is the weird part. I am getting a guide on the screen, but I am not getting any video. I have a few good script's that are currently working, but I am only getting a black screen. Reflash maybe? or is this something else.

Is this common?

[skinerd]

If you don't have 13v - 18v at the sat in, you will not receive any signal.......are you sure you have nothing? How else would you have a strong signal?

The lnb requires 13v for one set of transponders and 18v for the other.

[hoser]

Skinerd.

Sorry for the misunderstanding. I have two 420 receivers with two different problems now, at first they would only power on for a second then shut off. I do not know why all of a sudden after I checked the volts of CR14108 to ground, I have the ird turning off and on like normal without doing anything. I have no sat in voltage on one ird. (I will deal with this one later)

The one that I want to talk about and fix is the other ird that has the black screen with a guide and good sat in voltage (13v-18v) There is no problem with my 3m and activation script's. I am just getting guide, good signal strength (on all transponder's) and a black screen with NO picture.

[skinerd]

Good signal, black screen with no pic, have you tried a known good card to see if it gets channel 100?
I am assumng it gets no audio either??

[hoser]

Good signal, black screen with no pic, have you tried a known good card to see if it gets channel 100?
I am assumng it gets no audio either??


I have a good card, good signal, black screen, no pic, no sound and no channel 100.

I just did a hard reboot and I am able to go through the motion's of purchasing a movie, but still have none of the above.

[skinerd]

Have you tried reflashing and rewriting another eeprom to it?
Other than that I would verify all out put voltages from the power supply;
CR14108 -13v
CR14105 +5v
CR14104 +22v
CR14106 +3.3v
U14103 -5v

these are schematic voltages and are very close to reality.

[hoser]

CR14108 -14.46v
CR14105 +5.19v
CR14104 +22.38v
CR14106 +3.43v
U14103 -5.05v

I am going to try and reflash the eeprom, I am heating up the iron.

Thanks skinerd.

[skinerd]

CR14108 -14.46v
CR14105 +5.19v
CR14104 +22.38v
CR14106 +3.43v
U14103 -5.05v

I am going to try and reflash the eeprom, I am heating up the iron.

Thanks skinerd.


do the flash and eeprom while you are hooked up.

[hoser]

I am getting an error when I try to erase the flash.....

[skinerd]

I am getting an error when I try to erase the flash.....


Trace cut and 5v to FP?? That's the best way, you can then ignore the dev panel stuff. Just hook it up and erase it.

[hoser]

Skinerd.

I erased the flash and put a nozkt flash and still no vid, sound, no 100, etc as above. I was flipping around the channels and I am getting the music channels up on 800. What's up with that? The script is good becouse I just unmarried it and it works in my other modded 420. It almost seems the receiver is not detecting the dsw which is at 006. I don't know. I am pooched for the night and will check back in the morning.

Thanks for all your help.

[skinerd]

Take a look at the card slot, maybe the card is not making contact with all pins, wierd problem, known good card, no regular channels, no previews, but music channels work....never heard that one before. Almost like receiver thinks it has a H card in it.

[hoser]

Take a look at the card slot, maybe the card is not making contact with all pins, wierd problem, known good card, no regular channels, no previews, but music channels work....never heard that one before. Almost like receiver thinks it has a H card in it.

I have an activation on the card, I can purchase the movies (press info for ordering information) and when I do that, I get the same thing (Thank you for your purchase, enjoy your program) but I still get no vid and no pic.

[skinerd]

Do you have another card you could try?? I don't know what else to tell you.........strange problem.