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Topic:
mx-850 solder points
This thread has 4 replies. Displaying all posts.
Post 1 made on Tuesday December 26, 2017 at 18:13
greyleopard66
Junior Member
Joined:
Posts:
June 2014
5
The MX-850 has what looks like a membrane circuiyt layer between the pcb and the rubber buttons. This thin layer appears to have 2 to 3 contact points near the bottom of the remote. How is this layer attached to the pcb? Is it a conductive glue or solder paste? Does the pad in the middle get connected? Are there any other contact points joining membrane to the pcb. I am calling it a membrane layer, but it appears to be a circuit layer. Pink on top and silver on bottom. I assume new stock on the MX-850 doesn't exist anymore, so I need to repair several units.
Post 2 made on Wednesday December 27, 2017 at 12:14
tomciara
Loyal Member
Joined:
Posts:
May 2002
6,597
You haven't stated your symptom.

Most likely fail is wear on the buttons, not solder issues. There are no reliable fixes for wear.
"Men occasionally stumble over the truth, but most of them pick themselves up and hurry off as if nothing ever happened." - Winston Churchill
OP | Post 3 made on Wednesday December 27, 2017 at 13:21
greyleopard66
Junior Member
Joined:
Posts:
June 2014
5
Thanks for the reply. I'm looking for someone with rework experience. The symptom is, top layer of the printed circuit assembly is detached from the PCB. I'm referring to the pink layer just below the rubberized keys, sitting on top of the PCB. Pink on top side, silver on bottom side. It is attached to the PCB near the bottom of the keyboard assembly. By what appears to be conductive glue, solder paste or conductive tape. Can someone confirm the attachment material? How, where, and how many points exist.
Post 4 made on Wednesday December 27, 2017 at 22:35
tomciara
Loyal Member
Joined:
Posts:
May 2002
6,597
I don't believe you are gonna find much information. As you know, those don't even get repaired when they go back to URC for the repair cost, they just send a brand new one in the box. There was a period of time where you could buy buttons for the MX-900 that fixed that one model. None avail for the 850 that I know of.

At one time you could buy a conductive paint of sorts that you could paint on the circuitboard pads when they started getting flaky, but that was an incredibly temporary fix. I am not much help, I am sorry to say, just not expecting that what you are trying to do gets done by people on this board.

FWIW I may have a few new 850s still.
"Men occasionally stumble over the truth, but most of them pick themselves up and hurry off as if nothing ever happened." - Winston Churchill
Post 5 made on Thursday December 28, 2017 at 09:32
edmund
Elite Member
Joined:
Posts:
April 2002
13,527
That pink layer is for the backlighting, has nothing to do with conductivity of buttons working or not.


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