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

bje@ripco.com: Nov 26 11:30AM

> Have you done anything with the settings? Most TVs come from the factory
> on "display mode" with all settings at maximum. Which, of course would max
> out the power-supply.
 
 
Hmmm, I dunno about this, it's one thing to max out a power supply and
another to cause parts to smoke and burn. Me thinks Samsung would have a few
lawsuits to deal with just because someone enjoyed "vivid".
 
The set has had a hard life and there is really no tears here. Like I
mentioned, it's been in use for the past 10+ years, usually on for 12-15
hours a day (usually background noise).
 
The only reason it's not in the trash yet is 1) it's a native 1080p in a
small package (25") which doesn't seem to be made anymore and 2) it has just
about any video input you need, hdmi, dvi, vga, component and composite.
 
The sad part about all of this is I replaced it with a 32" Sanyo that
Microcenter was blowing out for $49.95, less than the parts I spent trying
to fix the Samsung.
 
-bruce
bje@ripco.com
"pfjw@aol.com" <peterwieck33@gmail.com>: Nov 26 04:42AM -0800


> Hmmm, I dunno about this, it's one thing to max out a power supply and
> another to cause parts to smoke and burn. Me thinks Samsung would have a few
> lawsuits to deal with just because someone enjoyed "vivid".
 
That would be the fallacy of "Leaping to Conclusions", with a smattering of "begging the question" thrown in.
 
Try the settings, and see if that does not cool things down. If not, you are no worse off. If so, enjoy it for a few more years.
 
Peter Wieck
Melrose Park, PA
John-Del <ohger1s@gmail.com>: Nov 26 05:17AM -0800


> Any guesses?
 
> -bruce
> bje@ripco.com
 
Bad lamps. Most CCFL inverters shut down when a defective lamp is encountered and I am very surprised this one doesn't. It won't be a shorted lamp but a lamp(s) that are weak and require more voltage to deliver the current the inverter transformer is designed to deliver.
 
That board has a single output transformer, but it has two secondaries. A way to check this is to turn the TV on and put your scope probe *NEAR* the output harnesses or connector and watch the waveforms. Use a high vertical input setting and a fast horiz setting. Make sure to place the probe in the same relative position to the connector on both sides as the physical placement of the probe changes the amplitude greatly.
 
Don't connect the probe electrically to the inverter unless you were planning to buy a new scope anyway...
 
Now, one of the two waveforms will be much higher than the other, maybe twice as high. The actual amplitude isn't important because you're only looking for differences between the two sides, not taking p-p measurements.
 
Mark which side is higher, then see if you can switch the two harnesses and try again. You'll probably have to flip the board over to do this so make sure you put down an insulator between the board and TV frame because those heatsinks could be at hot ground potential.
 
If the side that was higher is now lower and vice versa, you have an open lamp(s) in the display. You might be able to find CCFL tubes on line to replace them.
Ralph Mowery <rmowery28146@earthlink.net>: Nov 25 02:09PM -0500

In article <JrednUxVUfnRCEbAnZ2dnUU7-SednZ2d@giganews.com>,
jdangus@att.net says...
> He has finally admitted to being a hack.
> I said you were a hack.
> I stand by my observation.
 
Sometimes it takes a hack to get the job done at a reasonable cost.
 
Like a car company wanted lots of money to replace a freeze plug on a
car engine. Due to where it was placed , they said the motor needed to
be pulled.
 
A local hack said he could do it for almost nothing. Pulled the carpet
back inside the car. Took a hole saw on a drill and cut a hole.
Replaced the plug , pop rivited a beer can cutout over the hole and
replaced the carpet.
"pfjw@aol.com" <peterwieck33@gmail.com>: Nov 25 12:16PM -0800

Care to speculate on the horrific consequences of that particular "hack"? And I doubt if those consequences are specific to the US.
 
Peter Wieck
Melrose Park, PA
Fox's Mercantile <jdangus@att.net>: Nov 25 02:22PM -0600

On 11/25/19 1:09 PM, Ralph Mowery wrote:
> back inside the car. Took a hole saw on a drill and cut a hole.
> Replaced the plug , pop rivited a beer can cutout over the hole and
> replaced the carpet.
 
That's a clever repair. I did the same thing on a '68 Dodge station
wagon. The freeze plug on the rear of the cylinder heads.
Cut a hole, or pull the intake and the heads. Obvious choice.
 
WHEN you work on your own vehicle. You have next to zero funds and
you need to drive it into work the next day.
 
Had I had the time, I would have pulled the engine and replaced all
the freeze plugs at the same time instead of one at a time.
 
I had the time over the weekend, and that's exactly what I did.
including pulling the flywheel and getting the two behind it.
 
 
 
 
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
"pfjw@aol.com" <peterwieck33@gmail.com>: Nov 25 12:30PM -0800

Cut a hole, or pull the intake and the heads. Obvious choice.
 
Care to speculate, as I asked Ralph, on the consequences?
 
Peter Wieck
Melrose Park, PA
Fox's Mercantile <jdangus@att.net>: Nov 25 03:05PM -0600

> Cut a hole, or pull the intake and the heads. Obvious choice.
 
> Care to speculate, as I asked Ralph, on the consequences?
 
As to the operation of the cooling system? No difference of
doing it right. The plug was installed correctly using an
installation tool.
To the vehicle itself? A Campbell's soup can lid pop riveted
to the firewall over the hole I cut. Complete with some
sealant to properly seal the firewall.
 
However, I might add, that the following weekend, I pulled
the engine out and replaced the rest of the freeze plugs.
Because I didn't want any more trouble with them.
 
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
"pfjw@aol.com" <peterwieck33@gmail.com>: Nov 25 03:03PM -0800

Nope. Care to try again?
Al <iqbalali898@noreply.com>: Nov 26 12:08AM


> Care to speculate on the horrific consequences of that particular
> "hack"?
 
Yeah, I should imagine the possibility of a slight draft in the area of
the footwell that side. Just maybe... But that's all.
Ralph Mowery <rmowery28146@earthlink.net>: Nov 25 07:58PM -0500

In article <qrhqda$roo$3@dont-email.me>, iqbalali898@noreply.com says...
> > "hack"?
 
> Yeah, I should imagine the possibility of a slight draft in the area of
> the footwell that side. Just maybe... But that's all.
 
No draft, covered by the cut up beer can and carpet.
 
I doubt a 3 inch in diameter how would cause any real problem. It would
have cost more than the car was worth anyway if the motor had to be
pulled.
Mike Coon <gravity@mjcoon.plus.com>: Nov 26 09:37AM

In article <MPG.384642a55dafaf14989c5a@news.east.earthlink.net>,
rmowery28146@earthlink.net says...
 
> I doubt a 3 inch in diameter how would cause any real problem. It would
> have cost more than the car was worth anyway if the motor had to be
> pulled.
 
When I was a student I shared rides in a car with a hole in the floor on
the passenger side. The trick was to keep your foot on the hole to avoid
when going through any puddle getting a jet of water up your trouser
leg.
 
We probably could not afford a pop-riveter and sealant, and the beer may
have come in bottles. Wet carpets are no fun, either...
 
Mike.
"pfjw@aol.com" <peterwieck33@gmail.com>: Nov 26 04:01AM -0800

OK. To attempt to get you all to think "outside the box".
 
Question: Why do we stop at STOP signs, even when there is no one else (visible) around?
 
You park your car on a hill. You neglect to turn your wheels to the curb. Some kid sees change in your cup-holder and breaks into the car, meanwhile releasing the parking brake. The car rolls down the hill and hurts someone. Who is responsible?
 
Now, consider that hole in that firewall. Please try to think it through.
 
Peter Wieck
Melrose Park, PA
John-Del <ohger1s@gmail.com>: Nov 26 04:53AM -0800


> Now, consider that hole in that firewall. Please try to think it through.
 
> Peter Wieck
> Melrose Park, PA
 
You're going to hate this story Peter: I had an old Explorer that had a bad fuel pump. This truck was originally sold near the shoreline and and had suffered almost 20 years in the rust belt. There was no chance of getting the fuel tank down without fighting through rusted hardware and other issues, so I got out my nibbler and opened an access hole under the back seat right over the fuel pump flange. 90 min in an out.
"pfjw@aol.com" <peterwieck33@gmail.com>: Nov 26 04:59AM -0800

On Tuesday, November 26, 2019 at 7:53:27 AM UTC-5, John-Del wrote:
 
> > Peter Wieck
> > Melrose Park, PA
 
> You're going to hate this story Peter: I had an old Explorer that had a bad fuel pump. This truck was originally sold near the shoreline and and had suffered almost 20 years in the rust belt. There was no chance of getting the fuel tank down without fighting through rusted hardware and other issues, so I got out my nibbler and opened an access hole under the back seat right over the fuel pump flange. 90 min in an out.
 
Which is not the firewall. And, there are actual after-market hatches for that application. Which are not made from aluminum beer-cans and aluminum pop-rivets.
 
https://www.summitracing.com/parts/tnk-ad-66?seid=srese1&gclid=Cj0KCQiAt_PuBRDcARIsAMNlBdoNrWes9c1ZaHtW5jN_Qigc5WOsWbm7rhtW3ItFjgIdTLDofkTwwZQaAvnoEALw_wcB
 
Peter Wieck
Melrose Park, PA
Cursitor Doom <curd@notformail.com>: Nov 25 10:12PM

On Sun, 24 Nov 2019 22:10:44 -0800, tabbypurr wrote:
 
> he's aping slowman.
 
Just plain aping. I find it impossible to believe that anyone could
*genuinely* be that stupid. Hence my deduction he's a troll - and now one
of the very few posters I've felt it necessary to perma-plonk. Just think
of all that valuable future time I've saved myself by avoiding further
futile and infantile exchanges from him. >:-}
 
 
 
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Fox's Mercantile <jdangus@att.net>: Nov 25 04:46PM -0600

On 11/25/19 4:12 PM, Cursitor Doom wrote:
> of the very few posters I've felt it necessary to perma-plonk. Just think
> of all that valuable future time I've saved myself by avoiding further
> futile and infantile exchanges from him. >:-}
 
I guess you lied about kill filing me.
 
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
Cursitor Doom <curd@notformail.com>: Nov 25 10:05PM

On Mon, 25 Nov 2019 07:57:16 +0200, Mikko OH2HVJ wrote:
 
 
> The turns are there for pliers or other tool to absorb the heat while
> soldering the thermal fuse to the PCB. It's quite easy to blow a low
> temperature rating thermal fuse while soldering.
 
Ah, thanks very much for that, Mikko; the missing piece in the jigsaw!
 
> What't the schematic like, are the resistors connected in such a way
> that they would heat during some failure condition and blow the fuse ?
 
I don't have a schematic, but that's been my working assumption
throughout. It makes sense that way.
 
 
 
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