Digest for sci.electronics.repair@googlegroups.com - 13 updates in 4 topics

Stu jaxon <stankowalski02@gmail.com>: Jul 20 12:46PM -0700

On Friday, July 19, 2019 at 8:19:59 PM UTC-4, John-Del wrote:
 
> You're confusing me. Are you saying that both the original TCON board and the one you just bought are showing a low ohm short to ground as read on that ferrite bead near the LVDS cable?
 
> >I put the original main board back in, and got two 12v & 5v inputs to the tcon on cn702..
 
> Again, see if there is any 12DC voltage on the LVDS connector when it is disconnected from the TCON. IIRC, the CN702 connector goes to the power supply, not the main. Is there 12V on the LVDS connector when it is lifted off the TCON?
 
OK, I miss read your post, I measured the fb on v scale, now i measured on ohms scale and with the tv on I get OL with the backlights on, when the backlights go out the fb reads lights a cap starts high 320k on both sides, this is with the new board recently purchased from ebay.. and what wire am i supposed to get 12v on at lvds connector when i pull it, there's 20-30 wires..?
Stu jaxon <stankowalski02@gmail.com>: Jul 20 02:27PM -0700

On Saturday, July 20, 2019 at 3:46:06 PM UTC-4, Stu jaxon wrote:
John-Del <ohger1s@gmail.com>: Jul 20 03:37PM -0700

> > Again, see if there is any 12DC voltage on the LVDS connector when it is disconnected from the TCON. IIRC, the CN702 connector goes to the power supply, not the main. Is there 12V on the LVDS connector when it is lifted off the TCON?
 
> OK, I miss read your post, I measured the fb on v scale, now i measured on ohms scale and with the tv on I get OL with the backlights on, when the backlights go out the fb reads lights a cap starts high 320k on both sides, this is with the new board recently purchased from ebay.. and what wire am i supposed to get 12v on at lvds connector when i pull it, there's 20-30 wires..?
 
 
OK, let's go back one step at a time...
 
With the TV off and your meter on ohms, what is the resistance at the fb to ground?
 
With the TV still off and the LVDS harness unplugged from the TCON and your meter on ohms, what is the resistance on the fb to ground?
 
With the TV on and your meter now set to DC volts, what voltage are you reading at the fb?
 
 
Do not attempt to read ohms with the TV running!
 
If you are getting 12V on the fb, you don't need to look for the voltage at the LVDS harness. But if there is no voltage at the fb, then we want to look for it with the TCON disconnected by reading it at the unplugged LVDS harness.
 
With the LVDS harness unplugged, you should be able to read 12V on several pins. The correct pins will be physically close to the fb, in other words, the first couple of pins at the side of the harness that would be close to the fb.
 
Perform all those tests using your original TCON and your replacement board. If there is a difference between them, then answer for both.
Stu jaxon <stankowalski02@gmail.com>: Jul 20 04:53PM -0700

On Saturday, July 20, 2019 at 6:37:17 PM UTC-4, John-Del wrote:
 
> If you are getting 12V on the fb, you don't need to look for the voltage at the LVDS harness. But if there is no voltage at the fb, then we want to look for it with the TCON disconnected by reading it at the unplugged LVDS harness.
 
> With the LVDS harness unplugged, you should be able to read 12V on several pins. The correct pins will be physically close to the fb, in other words, the first couple of pins at the side of the harness that would be close to the fb.
 
> Perform all those tests using your original TCON and your replacement board. If there is a difference between them, then answer for both.
 
with the new tcon board installed, ON FB to ground both sides are .3-4m ohms. with lvds unplugged 400k one side other 300k ohms.. TV on testing pins closest to FB the highest was 1.4v - 0v..
 
Old Tcon board... .4 ohms both sides,.. lvds unplugged .3 ohms... TV on .2mv on FB TV lvds unplgged pins closest to FB 2v- .3 mv.. hope i covered everything...
Stu jaxon <stankowalski02@gmail.com>: Jul 20 05:16PM -0700

On Saturday, July 20, 2019 at 7:53:56 PM UTC-4, Stu jaxon wrote:
Stu jaxon <stankowalski02@gmail.com>: Jul 20 06:18PM -0700

On Saturday, July 20, 2019 at 8:16:51 PM UTC-4, Stu jaxon wrote:
Stu jaxon <stankowalski02@gmail.com>: Jul 20 06:20PM -0700

On Saturday, July 20, 2019 at 8:16:51 PM UTC-4, Stu jaxon wrote:
John-Del <ohger1s@gmail.com>: Jul 21 06:21AM -0700

On Saturday, July 20, 2019 at 7:53:56 PM UTC-4, Stu jaxon wrote:
 
> > Perform all those tests using your original TCON and your replacement board. If there is a difference between them, then answer for both.
 
> with the new tcon board installed, ON FB to ground both sides are .3-4m ohms. with lvds unplugged 400k one side other 300k ohms.. TV on testing pins closest to FB the highest was 1.4v - 0v..
 
> Old Tcon board... .4 ohms both sides,.. lvds unplugged .3 ohms... TV on .2mv on FB TV lvds unplgged pins closest to FB 2v- .3 mv.. hope i covered everything...
 
Standby till Monday. I have a donor set of boards for that model but it's for the version with a separate TCON and FRC, so I don't have the combo TCON that you do. Still, the voltages from the main should be the same on the LVDS harness. I'll put the boards together and get some voltage readings.
jjhudak4@gmail.com: Jul 20 10:20AM -0700

On Saturday, July 20, 2019 at 12:07:15 AM UTC-4, Lucifer wrote:
 
> The complete cable is cheap.
 
> >Thanks
> >J
 
Yes it is, but they all have the same weak spot which admittedly, can be reinforced but I'd prefer to rebuild mine, if possible.
 
And yes, I know the difference between 'lightning' and 'Lightning' and 'usb' and 'USB'....and anybody with 1/2 a brain would understand the meaning and context of the question.
And for the pedantic ppl in the crowd, it should properly be cited as 'Apple Lightning (TM) since it is a registered trademark - not simply 'Lightning'....
 
So that raises a question (since some ppl like to pick 'fly sh*t' out of pepper), if one refers to a knock off Apple Lightning to USB cable, should they properly call it a 'Apple Lightning to USB' cable? a 'Lightning to USB' cable, a 'lightning to USB' cable??? or perhaps a 'bootleg work-a-like Apple Lightning to USB cable'????
 
I'll let the resident neurotic Phil answer this one since he seems to be most annoyed by the grammar/capitalization rules, and syntax of the phrase.... ....sheesh...
Phil Allison <pallison49@gmail.com>: Jul 20 09:29PM -0700

> > >Is there any place to buy just the plug so I can replace the damaged one?
>.
 
> And yes, I know the difference between 'lightning' and 'Lightning' and 'usb' and 'USB'....and anybody with 1/2 a brain would understand the meaning and context of the question.
 
 
** There was no context, you bulshitting ass.
 

> And for the pedantic ppl in the crowd, it should properly be cited as 'Apple Lightning (TM) since it is a registered trademark - not simply 'Lightning'....
 
** Yawnnnnnn, Lightning does it alone as it indicates a trade name - dickhead.
 

YOU have a horrible aversion to using capitals, like so many of your SMS lingo fingering half wit friends.
 
 
> I'll let the resident neurotic
 
 
** Nothing neurotic about me - asshole.
 

 
.... Phil
Jeff Liebermann <jeffl@cruzio.com>: Jul 20 07:11PM -0700

On Sat, 20 Jul 2019 11:00:19 -0400, "Percival P. Cassidy"
>edge shaped to match the ridges in cans and jars. Haven't seen such a
>thing since.
 
>Perce
 
It's called a "jar scraper tool" or something similar:
<https://www.google.com/search?q=jar+scraper+tool&tbm=isch>
<https://www.youtube.com/watch?v=2I-Fo0SF6qU>
<https://www.google.com/search?tbm=isch&q=peanut+butter+jar+scraper>
<https://www.uncommongoods.com/product/peanut-butter-spoon>
 
However, that doesn't mean that manufacturers can't retaliate and make
life difficult. Try scraping all the peanut butter out of these jars:
<https://www.google.com/search?q=peanut+butter+"sun-pat"&tbm=isch>
 
 
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Jul 20 07:23PM -0400

On 7/19/19 12:32 PM, Ron D. wrote:
> just have a 12 V signal that tells it to transfer. It may or may not
> need power to keep it in one position. I did not look at the
> details.
 
My transfer switch is a pair of 30A breakers for the genny and an
aluminum sheet that slides up and down, so that the main breaker and the
genny breakers can never be turned on at the same time.
 
Cheers
 
Phil Hobbs
 
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510
 
http://electrooptical.net
http://hobbs-eo.com
Fox's Mercantile <jdangus@att.net>: Jul 20 06:43PM -0500

On 7/20/19 6:23 PM, Phil Hobbs wrote:
> My transfer switch is a pair of 30A breakers for the genny and an
> aluminum sheet that slides up and down, so that the main breaker
> and the genny breakers can never be turned on at the same time.
 
I have the same set up at the house.
200 Amp pass through panel with 200 amp main breaker. Then the 60
amp breaker for the 15 KW generator.
 
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
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