ChrisABQ
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Does someone have a picture with the capacitor on their board? I have seen the pictures of the board on page 33 (which I have - 6800 model) and page 34 (I guess is the old board?).
BCD436HP/BCD536HP: UHF Reception Issues due to Noise from Battery Compartment
- Thread starter bearcat
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Great! So now we know they are aware and are installing the cap. So far only yours and mine are confirmed to have the cap on this thread.
Yes the picture on page 33 is the new board, but that one is missing the cap. The picture on page 34 is the old board which we really do not know where the cap should go. Unless one of those folks have figured it out by now. Do you have cap or the solder pads for it?
There is no way to know based on serial number.
Has anyone with the cap been able to see the value on it?
Mine's a 48000 and had the recall done (1.09.02 board). I have the C1 pads but no cap. As to C1's traces - that is truly microscope-level work, and maybe even beyond that. Adding the cap doesn't appear to be too bad, but I wouldn't want to be the 1st or 5th person to do it. I'm also not equipped to do any objective before/after testing.
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Here is a pic of my board, with the cap installed. Scanner was purchased a month ago, and has not been sent in to Uniden.
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Yes this is not a project for us who do not have the proper equipment. No testing is needed if you are missing the cap you have the noise problem and your UHF reception is suffering. If you have the cap the noise is gone. You might be able to find a local radio shop to do the soldering or send it to Uniden and request them to install it.
RT48
Member
Does it ask you to enter the time when you first turn it on? If it doesn't, then you don't have the problem. My 436 will be three years old in May and it has not shown either the clock problem or the dimming problem.
bearcat, what value cap did you have installed on your board? Do you have a link to where you bought it from?
Thanks
Thanks
I would think that any 436 in question should be tested for this problem and maybe someone can come up with a standard test that would show it has excessive noise in the UHF band. Then if it does, send them all back to Uniden for repair and under warranty, because that would be considered a factory defect.
prcguy
prcguy
I put a .01uf in mine. I did not buy it I pulled it off of a circuit board I had laying around. I had a schematic for it so I know the value. Actually the board had two of them. I ruin one trying to get it off
It is very simple. If the cap is missing you have the noise. There is nothing more than that to it. There are several tests you can do that are covered in this thread. At this point I would check for the cap that is the tell all.
What I meant was that I'd like to have some assurance (it won't happen, I know) that adding the cap was the only change made within the 1.09.02 boards; adding the cap itself shouldn't be difficult (they even included the solder 😉
.I wonder if the boards without the chip were intended to have it, but are actually defective?
Right there may be more that was added, but I have had no adverse effects from adding the cap. Just a dramatic improvement in UHF reception. So anything else they may have done probably has nothing to do with the battery compartment noise. Please let us know the results when you put one in yours. Sorry I guess I read your comment wrong the first time.What I meant was that I'd like to have some assurance (it won't happen, I know) that adding the cap was the only change made within the 1.09.02 boards; adding the cap itself shouldn't be difficult (they even included the solder 😉
I wonder if the boards without the chip were intended to have it, but are actually defective?
Yes I think the board was intended to have the cap along. Remember I found this by buying a new 436. There was no noise on the new unit so I started to compare the circuit boards and the cap popped out like a sore thumb. I think it was a quality control oversight. I truly believe the shielded door findings made them take a look at the issue. Even though they have never commented on the issue. At that point (well a few weeks later) I added the cap to my old unit and the noise is gone. Both do have the 1.09.02 display board.
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I will try adding a cap to my 1st gen board but I'm lazy right now. I'll update when I get to it with results.
Is there also a resistor that is missing on the old board?
I believe so, unless that's an inductor which would make more sense.
BOBRR
Member
Which S/N's effected ? (BCD 436)
Hi,
Interesting stuff.
Could someone please summarize what S/N's have the Cap and Resistor, and which do not ?
Really don't want to open unit up. Where are these S/N located on the unit ?
Is there also an issue with the display ? Which ones ?
What's Uniden's policy on installing the Cap and Resistor if the unit is returned ?
Will they ?
For a fee / Or,...?
B.
Hi,
Interesting stuff.
Could someone please summarize what S/N's have the Cap and Resistor, and which do not ?
Really don't want to open unit up. Where are these S/N located on the unit ?
Is there also an issue with the display ? Which ones ?
What's Uniden's policy on installing the Cap and Resistor if the unit is returned ?
Will they ?
For a fee / Or,...?
B.
Uniden has said there is no way to know by serial number. If your display goes dark or your clock needs reset you have the issue. Uniden has never acknowledged the missing cap or the noise that it causes. I have seen identical boards one with the cap and one without. The newest one I have appears to have the display issue but it does have the cap. My older one which went back for the clock/display issue does not have the cap. Both display boards have the same version sticker.
What is your SN or at least the digit after the Z?
You can test for the noise by using another scanner or an SDR .
Now that we know that the cap exists. I would think the only true test is look at the board for the cap. We do not need to guess any longer on which units have UHF issue and the ones that do not.
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