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URC MX850 dropped - not working
This thread has 2 replies. Displaying all posts.
Post 1 made on Tuesday October 23, 2012 at 00:16
Lurking Member
October 2012
My URC MX850 dropped on the floor and landed hard. It stopped working and there was something rattling around inside it. I watched a YouTube video which showed my how to open the MX850, but it had a completely different type of connection for the smaller (what I now understand to be the transmit) board, to the lower board. I looks like it uses a spring to press the smaller board's male connector to the lower board's solder points. Are there different versions of the MX850? Is the any way to tell which version I have? If I should buy a used one, in "9 or10" condition, on eBay, how difficult is it to program.
I'd like to be able to take 2 units, one top section, with a STABLE spring connector version and marry it to my already programmed bottom section. Am I dreaming? Any recommendations?
Stephen Michael Aronson
Post 2 made on Tuesday October 23, 2012 at 01:04
Elite Member
April 2002
The second board is the Rf circuitry, the remote would work even it was removed, by IR only though. It sounds like theres more wrong with it then RF circuit board. Try reseating the lcd ribbon.

Are there different mx-850's, yes, I have seen three different ways the RF circuitry is connected.
Post 3 made on Saturday October 27, 2012 at 10:05
Active Member
February 2004
There actually are two versions, one version has the RF board mounted to the back of the remote and there is a small wire harness that plugs into the main (big) circuit board.

The second version (the one that you have) has the RF board soldered to the main board and sometimes when they get dropped hard, the solder lets go and the board rattles around inside.

The spring you refer to is actually the antenna for the RF transmitter, it is not a spring to hold the board in place.

If you look at the RF board, you can see the connector that used to be soldered to the solder pads on the main board. You can also see that those were surface mounted, they did not go through the main board. On the other side of the RF board you can see that the same connector is soldered THROUGH the RF board.

Here is the ONLY fix for you. Desolder the connector from the RF board and remove it, then solder the connector to the solder pads on the main board. Once the connector is soldered to the main board, set the RF board on the connector so the pins go through the RF board as they did before you removed the connector. Now solder those pins through the RF board.

As you can see, there is no way to solder the connector to the main board because you couldn't get a soldering iron between the RF and main boards. We have fixed quite a few of these, always after they have been dropped hard.

Good luck.
There are 10 types of people in this world,
There are those who understand binary,
and those who don't!

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