Re: Actually On Topic Question

[Bob La Londe <none@none.com99>]

On 3/11/2023 11:08 AM, RTS wrote:
> On 3/11/2023 11:18 AM, ABLE1 wrote:
>> On 3/11/2023 10:44 AM, RTS wrote:
>>> On 3/10/2023 7:32 PM, ABLE1 wrote:
>>>> Hello Guys!!!
>>>>
>>>> Hope everyone is doing well.  As for me, I am still beating the bushes.
>>>>
>>>> I have a customer that has a Vista 20p with a Tuxedo Touch Screen that
>>>> as been working just fine since I installed it 11 years ago and it is
>>>> now constantly rebooting.  I have not been on site as of yet but, the
>>>> customer has done some troubleshooting and said that the voltage
>>>> is holding steady at 13.2vdc while the touch screen reboots.
>>>>
>>>> I briefly talked to Tech Support and asked if this was a known issue.
>>>> I was told that it was not, but should check for a loose connection
>>>> and check the voltage.
>>>>
>>>> Again, I have not been on site, but will be next week.  I thought I
>>>> would reach out here to see if there should be other things that
>>>> should be looked at before declaring the Touch Screen was scrap.
>>>>
>>>> The docs say that the unit draws 270ma.
>>>> Presently I am not sure what power source it is connected.
>>>> I am thinking it would be the Aux + & -
>>>>
>>>> I would think if the Aux Power was the issue the voltage would not
>>>> be holding steady at 13.2vdc.
>>>>
>>>> Anyone have any thoughts as to a solution or knowledge on this issue??
>>>>
>>>> Thanks,
>>>>
>>>> Les
>>> this may sound crazy,  but  look for "Cricket bits"
>>>
>>> this time of year,  we use to have nutty behavior with remote
>>> processing unit, (keypads, expanders, remote relays)
>>>
>>> each time we found Crickets had eaten the insulation off the wires
>>> and moisture was causing high resistance shorts on the circuits..
>>>
>>> Never full time, mostly when the air moisture reach a point when
>>> droplets formed..
>>>
>>> RTS
>>
>> Hi Rocky,
>>
>> Not totally crazy!!  Just last week I had to disassemble an exterior
>> gate controller that had spider webs and stink bugs on the circuit
>> board and was causing the "Fire Input" terminals to short and locked
>> the gate open.
>>
>> As for this Ademco unit, that is something that is doubtful since
>> it is inside the house.  However, you are right it should be looked
>> at just to verify.
>>
>> Thanks,
>>
>> Les
>>
> We had a FBII 2-TÂ  in a small restaurant that started have odd alarms..
> when we opened the panel door, the PCB was covered in (what I called bug
> spit), a dark goo..
> After a complete cleaning with de-grease spray,  every thing went back
> to normal..
> with bugs, it pays to seal all access points to the electronics..
> paraffin (candle wax) coated, cotton balls tend to do the job, cheaply..
> BRK Electronics from Louisville, use to water proof their Glass Breakage
> detectors with that trick.. (paraffin)
> ..
> on another topic,  I noticed that Chinese capacitors tend to burst if
> the air temperature lingers around 30 degrees for to long..
> I guess they have some type of water based dielectric in their
> construction..
> ..
> Trick I've used to locate long wires that have had their insulation
> eaten away, was to open both ends of the run and apply a hefty
> voltage/current run through the wire..
> (load resistor at one end, voltage/current at other)
> (try not to exceed the limit of the copper size..  ;-)  )
> When the copper flexed with the load,  the short would show itself..
> If your handy with a "Megger", you can get close to the spot where the
> bad insulation is located..
> If not,  up the current and follow the smoke...   LOL
> ...
> RTS
>
> (don't you just love it when the copper turns a bluish tint...)

There was a time period in the 2000s when Chinese capacitors had a
particularly bad issue with exploding.  I saw computer motherboard,
VFDs, and other power control circuits with popped Chinese caps.  I have
not seen or heard much of this with stuff of more recent manufacture.

--
Bob La Londe
CNC Molds N Stuff


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