Digest for sci.electronics.repair@googlegroups.com - 18 updates in 4 topics

etpm@whidbey.com: Nov 05 09:06AM -0800

On Thu, 5 Nov 2020 07:48:06 -0800 (PST), Tim R <timothy42b@aol.com>
wrote:
 
 
>I did not realize there was another kind with higher resolution available until I saw an ad for 3D printed trumpet mouthpieces, and the required finish and resolution is much higher, so they are using a cured resin approach.
 
>I found this link:
>https://all3dp.com/1/best-resin-dlp-sla-3d-printer-kit-stereolithography/
I wasn't even thinking of the resin printers. They can generally print
at a higher resolution than filament printers. They are limited though
to just several resin compounds. Filament printers have, as of now,
many more options. For printing small stuff like knobs a small resin
printer might just be the ticket. And you can get small ones for about
200 bucks. Which leaves more money for the scanner. Maybe Pete doesn't
even need a scanner with high resolution. He could scan at the low
resolution and then clean up the scan with a CAD program. That would
work. I have done similar stuff converting jpeg files into CAD files.
Eric
 
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"Edward H." <dtgamer99@gmail.com>: Nov 06 06:39AM -0800

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Hiya,
 
If Pete decided resin was the way to go I would highly recommend Anycubic Photon for about $200 or the ANYCUBIC Photon S which has "dual rails" for a bit more, $400 or less. Anycubic has a huge following on facebook and I've been following them for a few years. Everyone there is extremely nice and the information they provide is invaluable. I might grab the Photon S next year. The Build volume : 115 x 65 x 165 mm.
"Edward H." <dtgamer99@gmail.com>: Nov 06 07:01AM -0800

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Creality has a huge following on Facebook and support can be found in a lot of places. You can find parts for it in many places if required.
Creality Ender 3 for about $200. Nice build volume 220x220x250mm and heated bed for ABS filament. I recommend building an enclosure if using ABS to reduce warping.
The Creality CR-10S can be found for under $400 and has a large build volume 300 x 300 x 400mm. This is what I would replace my Da Vinci 1.0a with in the future. Beast of a machine and it costs less than what I paid for my machine.
 
*PS you will have to assemble these printers yourself. I didn't have any issues with the Ender 3 I bought my little brother. Prints better than mine.
Hilda Winkler <hildawinkler77@gmail.com>: Nov 05 03:31PM -0800

> > Hi Group, can someone help please. I have a VIZIO Model # M550SV 55" randomly shuts off/on.. I checked the voltages on power supply board all are correct.. after doing research online, there seems to be a firmware problem. i hooked up to their website, couldn't find any updates.. is there a fix to this TV, ???
> That series is known for bad main boards that show all sorts of symptoms. No new ones are available, and used ones may put you in the same boat in a few months. Even when Vizio sells them, they are "recertified", which means they tested them to see if they work for 5 minutes and box them for sale. We've reflowed the BGA chip with inconsistent results but no longer take those in for service.
 
> That TV can update its firmware when connected on-line, but it doesn't seem Vizio ever released a later version of the firmware it was shipped with.
 
is there a board number locater for this BGA chip, ??? I have a hot air soldering gun, im gonna try to reflow it. would 350 degree's for 2-3 minutes suffice???
John-Del <ohger1s@gmail.com>: Nov 06 06:54AM -0800

On Thursday, November 5, 2020 at 6:31:05 PM UTC-5, Hilda Winkler wrote:
> > That series is known for bad main boards that show all sorts of symptoms. No new ones are available, and used ones may put you in the same boat in a few months. Even when Vizio sells them, they are "recertified", which means they tested them to see if they work for 5 minutes and box them for sale. We've reflowed the BGA chip with inconsistent results but no longer take those in for service.
 
> > That TV can update its firmware when connected on-line, but it doesn't seem Vizio ever released a later version of the firmware it was shipped with.
 
> is there a board number locater for this BGA chip, ??? I have a hot air soldering gun, im gonna try to reflow it. would 350 degree's for 2-3 minutes suffice???
 
It's the one under the silver heatsink. Remove the heatsink carefully because the sink will be stuck to the BGA. If you rip the BGA off the board, it's junk.
 
We've tried several profiles but they're hit or miss. Ideally it should be reballed or the chip outright replaced. Because of the drop in price for a new TV, we've stopped servicing this model.
 
I would go less on the temp, maybe 325C for 3 minutes tops. If it works, considering opening a hole in the back cover and adding a slow moving fan.
micky <NONONOmisc07@fmguy.com>: Nov 05 10:43PM -0500

Regarding remote controls that can learn, many say "can ONLY learn from
IR original remote which is working well, please make sure that your
original remote is an IR remote control and it is working well before
place an order."
 
Of course it has to be IR and of course it would help a lot if it worked
all the time, but why does it have to be an original remote, and not a
universal?
 
They learn by shining the output of the first remote into the new
remote.
 
In one case, I have a universal remote that has been assigned to my
model device. It works fine. How could it be so different from the
original remote that a learning remote could not learn from it?
Plainly it uses the same frequency or encoding or it woudln't work.
 
 
I know they have "regions" for DVD's so by electonic/programming means
you cannot play a DVD in the wrong region, so they could if they wanted
have an accompanying code that differentiates an original remote from a
universal remote, but why would they go to such trouble?
 
And who would implement it? Do the makers of original remotes accept
that there are universal remotes** but want to make them slightly less
valuable by not letting a learning remote learn from them?
 
Or would the makers of universal remotes or learning remotes put some
limitation on them? Why? I don't see how it could increase sales.
 
And aren't they all made by the same companies anyhow?
 
**Don't they provide the codes so that universal remotes know the
frequencies for all the various commands?
"Fred" <hju876@hotnail.com>: Nov 06 03:27PM +1100

"micky" <NONONOmisc07@fmguy.com> wrote in message
news:eug9qf9q00t92koam899esvkhldgv9qbqv@4ax.com...
 
> ONLY learn from IR original remote which is working well,
> please make sure that your original remote is an IR remote
> control and it is working well before place an order."
 
That's an over simplification with the original claim.
 
> Of course it has to be IR and of course it would
> help a lot if it worked all the time, but why does it
> have to be an original remote, and not a universal?
 
It doesn't.
 
> They learn by shining the output of
> the first remote into the new remote.
 
Yes.
 
> In one case, I have a universal remote that has been assigned to
> my model device. It works fine. How could it be so different from
> the original remote that a learning remote could not learn from it?
 
It isnt and it can learn from that.
 
> means you cannot play a DVD in the wrong region, so they could if
> they wanted have an accompanying code that differentiates an original
> remote from a universal remote, but why would they go to such trouble?
 
They don't.
 
> And who would implement it? Do the makers of original remotes
> accept that there are universal remotes** but want to make them
> slightly less valuable by not letting a learning remote learn from them?
 
They don't. And some universal remotes can be programmed
just by specifying the remote they are replacing, not by learning.
 
> Or would the makers of universal remotes or
> learning remotes put some limitation on them?
 
No one does.
 
> Why? I don't see how it could increase sales.
 
> And aren't they all made by the same companies anyhow?
 
Nope.
 
> **Don't they provide the codes so that universal remotes
> know the frequencies for all the various commands?
 
The more common ones, anyway.
Bob F <bobnospam@gmail.com>: Nov 05 09:00PM -0800

On 11/5/2020 7:43 PM, micky wrote:
 
> And aren't they all made by the same companies anyhow?
 
> **Don't they provide the codes so that universal remotes know the
> frequencies for all the various commands?
 
My logitech "Harmony" remotes were easily programmed for all my devices
from their website in the internet. Just specify the device, and it had
everyone I needed. I really like these remotes. Easy to program for any
desired combination of devices.
micky <NONONOmisc07@fmguy.com>: Nov 06 02:29AM -0500

Thanks for the answers.
 
Two more questions. 1) When they say a remote will control 4 or 6
devices, I think if it as an Aux choice, you can choose anything,
including a second TV.
 
But what if just has TV, VCR, DVD, CBL, Settop, AC, and no button is
marked Aux or AnyOldThing. Does that mean only one tv per remote? Or
do they just label the buttons to help remind you which one you chose,
but any button, TV, VCR, DVD, CBL. AC. can contol anything that any
other button can control.
 
2) My DVDR remote has 40 buttons. I only need 20, counting 0-9 When I
teach a learning remote, do I have to teach it all 20 buttons separately
or will it somehow learn some or all without individual button pushing?
Will it at least assume 0-9 are still 0-9. That would leave 10. Will it
learn any others so easily? (One ad seemed to say it did that, but I
didn't want that one for other reasons.)
 
 
More below.
 
 
In alt.home.repair, on Fri, 6 Nov 2020 15:27:42 +1100, "Fred"
>> please make sure that your original remote is an IR remote
>> control and it is working well before place an order."
 
>That's an over simplification with the original claim.
 
That's my question. I quoted the ads word for word.
 
>> help a lot if it worked all the time, but why does it
>> have to be an original remote, and not a universal?
 
>It doesn't.
 
I'll buy that.
 
>> my model device. It works fine. How could it be so different from
>> the original remote that a learning remote could not learn from it?
 
>It isnt and it can learn from that.
 
Good.
 
>> slightly less valuable by not letting a learning remote learn from them?
 
>They don't. And some universal remotes can be programmed
>just by specifying the remote they are replacing, not by learning.
 
Sure. That's what makes them universal.
 
 
>> Why? I don't see how it could increase sales.
 
>> And aren't they all made by the same companies anyhow?
 
>Nope.
 
Okay. It doesnt' matter if the previous answers make me happy, and they
do.
 
>> **Don't they provide the codes so that universal remotes
>> know the frequencies for all the various commands?
 
Meaning, that the TV manufacturers aren't keeping those things secret
from the remote manufactures, so why should they add an extra
difficulty.
 
>The more common ones, anyway.
 
Yes. That's anothr thing. One of my devices wasn't in the list of
devices. That was 5 or 10 years ago. Maybe by now it is. If so that
would make things easier, but if not, I need one that learns.
micky <NONONOmisc07@fmguy.com>: Nov 06 02:49AM -0500

In alt.home.repair, on Thu, 5 Nov 2020 21:00:55 -0800, Bob F
>from their website in the internet. Just specify the device, and it had
>everyone I needed. I really like these remotes. Easy to program for any
>desired combination of devices.
 
I looked first on Amazon and I didn't see any of those. That might show
how Amazon, even without trying, manipulates the market, just because
they have some modesl and brands for sale and not others.
 
However when I look specifically for logitech "Harmony" remotes, it has
several. I saw none when I looked for learning remotes. (Even though
for $269, it ought to be able to learn to teach physics and recite
Shakespeare.
 
I lke it whent they say works with 400,000 devices and 6,000 brands.
It's hard to believe there are that many.
 
Also hard to believe how expensive the Harmony ones are, $160 and up. I
only paid $19 last time, and I was up to about $35 this time. :-)
 
But I'll tune my mind to spending more money.
 
 
 
This one is a surprise. Under $7 and it learns but only a little bit.
https://www.amazon.com/Chunghop-Universal-Multifunctional-Controller-Conditioner/dp/B07CVG5WNS/ref=sr_1_4?dchild=1&keywords=learning%2Buniversal%2Bremote&link_code=qs&sourceid=Mozilla-search&sr=8-4&tag=mozilla-20&th=1
 
 
 
I noticed about stores only selling some brands when I changed
supermarkets because of the virus. The Safeway is missing certain brands
that I'm used to eating. Even Del Monte canned corn and spinach, week
after week they only have them without salt, or you can buy an off-
brand. I tried the spinach without added salt and it was terrible.
Salting it helped a lot but I'd rather they cooked it with salt so it
was well mixed. I haven't eaten the off-brand yet, but long ago I
noticed that, at least that one day, an off-brand had trimmed the corn
off closer to the cob so there's was a little that was hard and inedible
at the bottom of many kernels.
The Safeway doesn't have Nestle's chocolate syrup, but it does have
malted milk flavored ice cream. I had never seen that before, but they
have it every time I go there.
"Fred" <hju876@hotnail.com>: Nov 06 07:23PM +1100

"micky" <NONONOmisc07@fmguy.com> wrote in message
news:gtt9qft8jh821255gimg28vdn5hl3q7i9n@4ax.com...
> do they just label the buttons to help remind you which one you chose,
> but any button, TV, VCR, DVD, CBL. AC. can contol anything that any
> other button can control.
 
That varies with how fancy the new remote is. A few do allow
you to switch between more than one specific device like a TV
etc so the normal buttons do work fine on more than one TV,
 
> 2) My DVDR remote has 40 buttons.
 
Yeah, that's always a problem with any replacement remote.
 
? I only need 20, counting 0-9 When I teach a learning
> remote, do I have to teach it all 20 buttons separately
 
Usually with learning remotes, but not with remotes
where you specify which remote it is emulating.
 
> or will it somehow learn some or all without individual
> button pushing? Will it at least assume 0-9 are still 0-9.
> That would leave 10. Will it learn any others so easily?
 
Not usually with learning remotes.
 
> (One ad seemed to say it did that, but
> I didn't want that one for other reasons.)
 
The better remotes have downloadable manuals.
 
> More below.
 
How low can you go ?
 
micky <NONONOmisc07@fmguy.com>: Nov 06 04:20AM -0500

In alt.home.repair, on Fri, 6 Nov 2020 19:23:34 +1100, "Fred"
<hju876@hotnail.com> wrote:
 
 
Thanks for the comments.
 
 
>The better remotes have downloadable manuals.
 
>> More below.
 
>How low can you go ?
 
You ain't seen nothin' yet.
major <maj7789@aolspam.net>: Nov 05 11:48AM -0500

On 11/5/20 10:05 AM, major wrote:
 
>> ....  Phil
 
Ok, just as a follow up, I did keep both meters on the input side of the
dimmer. Voltage remained constant and nearly the same on both meters,
11.97 and 12.01 VDC, respectively, with dimmer off. At dimmer maximum
setting, voltage remained nearly constant (drop of -0.3 V) but current
changed from nearly nothing to the 7 A maximum with dimmer at max
setting. I swapped out the meters to read current just to be sure and
each showed the 7 A maximum. Then, I just adjusted the dimmer to
different positions, made some tick marks with current values indicated.
I think I'll just go with this. As you mentioned, losses through the
dimmer are probably slight and not an issue, at least in this
application. Thanks for your suggestions.
Trevor Wilson <trevor@rageaudio.com.au>: Nov 06 07:56AM +1100

On 6/11/2020 2:06 am, major wrote:
>> more sense.
 
>  You talking  a scope here or something else? If a scope,
> unfortunately, I don't own one.
 
**Well don't waste your time until you acquire one. In this application,
most meters are almost useless.
 
--
Trevor Wilson
www.rageaudio.com.au
 
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Phil Allison <pallison49@gmail.com>: Nov 05 01:02PM -0800

Trevor Wilson wrote:
 
==================
> > unfortunately, I don't own one.
 
> **Well don't waste your time until you acquire one. In this application,
> most meters are almost useless.
 
** So you are unaware even the simplest DC meter can read the power drain from a battery ?
 
I average x V ?
 
 
.... Phil
Phil Allison <pallison49@gmail.com>: Nov 05 07:20PM -0800

Jon Elson wrote:
 
================
> production would be huge.
> You can't expect a DVM to give accurate reading of a
> pulsating source.
 
** Still can certainly show the average DC voltage.
 
The usual input RC network doe the job nicely.
 
 
> Possibly some true-RMS meters may do a decent job of
> averaging the result,
 
** Only if the have response down to DC and up to the high harmonics of the PWM.
 
.... Phil
Trevor Wilson <trevor@rageaudio.com.au>: Nov 06 04:17PM +1100

On 6/11/2020 8:02 am, Phil Allison wrote:
>> most meters are almost useless.
 
> ** So you are unaware even the simplest DC meter can read the power drain from a battery ?
 
> I average x V ?
 
**Or you could do that.
 
 
--
Trevor Wilson
www.rageaudio.com.au
 
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Phil Allison <pallison49@gmail.com>: Nov 05 10:08PM -0800

Trevor Wilson wrote:
 
===================
 
> > the power drain from a battery ?
 
> > I average x V ?
 
> **Or you could do that.
 
** ;-))
 
 
..... Phil
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