sci.electronics.repair - 13 new messages in 9 topics - digest

sci.electronics.repair
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Today's topics:

==============================================================================
TOPIC: Dead Sony KV-T25SZ8 TV
http://groups.google.com/group/sci.electronics.repair/t/a211bd1fd48660f2?hl=en
==============================================================================

== 1 of 3 ==
Date: Sat, Mar 12 2011 10:37 pm
From: kreed

On Mar 13, 3:28 pm, Clifford Heath <n...@spam.please.net> wrote:
> On 03/12/11 22:18, Sylvia Else wrote:
>
> > This TV died abruptly, and completely without warning, while it was
> > turned on. It appears completely dead, other than than that the
> > degaussing still works.
>
> > There was some burning smell evident immediately after it failed, but
> > nothing has obviously suffered heat trauma.
>
> > Presumably there's a problem with the power supply, which looks like a
> > switch-mode. One thing I've noticed is that when power is connected, it
> > emits a clicking noise - about three times a second. When the power is
> > disconnected, the clicking doesn't stop immediately but continues for
> > several seconds, slowing down.
>
> > The clicking noise isn't coming from the speakers. I assume it's coming
> > from a transformer or choke.
>
> A friend and I (he very experienced) tries to fix a similar fault in a
> similar Sony TV a year back. The clicking was coming from a relay in the
> PSU, which appears to be driven via some circuitry from an opto-isolator
> from the main board. It would appear that it would try to power up, detect
> a fault, and shut off again, repeatedly. We never did get to the bottom of
> it. Really, with so many rather good glass TVs on the nature strip, are you
> sure it's worth the trouble?
>
> Clifford Heath.

We had a nice 2004 vintage Sharp set that failed about a year back.
Intermittent, wouldn't turn on sometimes but would other times.
had a fast look inside and saw corrosion around one of the IC's.
(looked like the CPU).

The set only just fit into the wheely bin, but it did fit. Saved a
trip out to the (isolated) main road to leave it for someone to take
home.

== 2 of 3 ==
Date: Sun, Mar 13 2011 7:43 pm
From: Sylvia Else

On 13/03/2011 4:29 PM, Sylvia Else wrote:
> On 13/03/2011 4:11 PM, Phil Allison wrote:
>> "Sylvia Else"
>>
>>>
>>> The horizontal deflection output transistor measures 5.7 omhs from
>>> emitter
>>> to base in either direction.
>>
>> ** Probably normal.
>
> Er, yes, I meant emitter to collector.
>
>>
>> There is an inbuilt resistor from B to E in nearly all HOTs of 20 ohms or
>> less.
>>
>>> It would certainly show as a short on the SMPS output.
>>
>> ** Bollocks.
>
> Probably true, for the emitter to base.
>
> I found what appears to be the correct schematic. The transistor's
> collector emitter junction is in series with an EHT transformer primary
> winding, and together they sit across the HT output from the SMPS, with
> just a small inductor in the way. I must admit it doesn't look to me as
> if it's performing a horizontal deflection output role - that's just how
> the transistor is described in the data sheet.
>
> Sylvia.

I've bitten the bullet, and bought a new television.

Still, I'm puzzled by the failure in the old one. The transistor has
clearly failed, as far as I can see. Removing the small inductor
mentioned above stops the clicking noise, which is consistent with there
no longer being a short across the SMPS.

I'd have expected the set to now turn on and produce sound. But it doesn't.

The SMPS uses a quasi-resonant circuit, and disconnecting the inductor
has a side effect of removing the feedback for the SMPS. But on my,
admittedly limited, understanding of such circuits, it should still work.

Sylvia.

== 3 of 3 ==
Date: Sun, Mar 13 2011 11:44 pm
From: "Phil Allison"

"Clifford Heath"
>
> However, HOTs are very strange devices. If you just do the basic
> two-diode test, you'll probably consider that a good one has failed.
> That's what I did :)... something to keep in mind.
>

** You need a " Power Transistor Tester" - published as a full construction
article in EA magazine back in May of 1988 by me. Altronics and Jaycar had
kits for it at one time.

It will reasonably accurately test the beta (or Hfe) of any power transistor
OR power Darlington pair OR horizontal deflection transistor. Very cheap
to make - uses only a few passives, a couple of red LEDs and a WW pot.

No PCB was used as it take only minutes to wire up the bits once they are
all fitted into a small jiffy box.

It will also allow close matching ( ie Vbe match) of groups of power
transistors that must operate in parallel.

Requires an external 12 volt DC source.

I would post the schem on ABSE, but like so many others I no longer have
access to the site.

..... Phil

==============================================================================
TOPIC: 1.250" dia speaker
http://groups.google.com/group/sci.electronics.repair/t/5dfae7373796a9e5?hl=en
==============================================================================

== 1 of 2 ==
Date: Sun, Mar 13 2011 3:59 am
From: martinmarty

On Mar 10, 5:16 pm, JR North <junkjasonrno...@bigfoot.com> wrote:
> So, my Uniden cordless handsets are 5 years old, been dropped TMT. The
> ringer speakers are kaput. They are regular cone type, 1.250" dia. Any
> Suggestions for source? Rat Shack-no go. Google is worthless.
> JR
> --
> --------------------------------------------------------------
> Home Page:http://www.seanet.com/~jasonrnorth

How about eBay for same/similar handsets? If you get lucky it could be
less $$ than the parts!

== 2 of 2 ==
Date: Sun, Mar 13 2011 5:27 am
From: "William Sommerwerck"

>> Call Uniden. Tell them that if they don't supply a replacement
>> at a reasonable cost, you'll toss the phones in the trash, and
>> will never buy Uniden products again.

> And they will say "Fine with us, but you should know that disposing
> of electronic items that way is illegal in some locales".

Then you say, "If you provided service parts, as the law requires, I
wouldn't be obliged to dump them."

==============================================================================
TOPIC: .02 mm pitch flex print PCB repair
http://groups.google.com/group/sci.electronics.repair/t/c0c9b49a40f732fa?hl=en
==============================================================================

== 1 of 1 ==
Date: Sun, Mar 13 2011 4:20 am
From: "N_Cook"

Michael Kennedy <mikek400@crap.comcast.net> wrote in message
news:waadnQx_0evQxebQnZ2dnUVZ_gqdnZ2d@giganews.com...
>
> "N_Cook" <diverse@tcp.co.uk> wrote in message
> news:ilfaie$3pr$1@news.eternal-september.org...
> > Michael Kennedy <mikek400@crap.comcast.net> wrote in message
> > news:VcydncYKZ9ShC-fQnZ2dnUVZ_q6dnZ2d@giganews.com...
> >> I have a Plasma tv that somehow I managed to partially tear one of the
> > flexi
> >> prints. I am not too sure how it happened since I was working on the
PSU.
> >>
> >> That aside, I think the PSU is fixed, but now the .02 mm pitch flexi
> >> print
> >> is torn..
> >>
> >> After doing lots of thinking and researching I think the way to go is
> > using
> >> a .02mm pitch zebra strip and connect wires from it to the connector.
> >>
> >> Now the question is does such a zebra strip exsist?
> >>
> >> Does anyone know where I can find such a zebra strip? Any know products
I
> >> could salvage one from??
> >>
> >> I hope to connect wires to the zebra strip and then connect those wires
> >> to
> >> the more reasonable sized .5mm pitch connector.
> >>
> >>
> >>
> >
> > What are the end points of the ribbon ? eg 2 connectors or connector and
> > glass ? and does it flex in use? is it microstrip/stripline in structure
> > with a grounded backplane?
>
>
> Fortunately there is no backplane, so I think we can get away with
modified
> circuit. I will try to get a picture up on the internet soon.
>
> The cable is directly connected to the glass on one end and has a standard
> .5 mm pitch *I think nothing to measure with at the moment* connector.
>
>
> In the middle just after the tear there is a blob IC attached to the
cable.
> The cable is then attached to an alunimum plate for security. I was
thinking
> of taking advantage of this alunimum plate by using it as a surface to
mount
> a zebra connector..
>
> The cable is curled in a c like shape so I think briding the original
> connection is the more dfficult route. I think with a zebra connector and
a
> pcb soldering the wires from the end connector to the pcb and the applying
> pressure to the zebra strip is a very viable solution. There is the
perfect
> place to mount it on top of that aluminum plate.
>
> Anyhow without pictures this is kind of hard to imagine. I will upload a
few
> pics..
>
> Thanks for the reply!
>
> Mike
>
>

Anyone successfully salvaged that expensive 3M anistotrpic conductive tape?
hot air , is that effective to dislodge the bond but not melt the
tape/destroy the anisotropy?
I just measured a standard size zebra and that had .2mm spacing, I could not
find my tin of watch bits, what is the spacing on those zebras?

==============================================================================
TOPIC: Lady Veteran has actually sent me a video of herself
http://groups.google.com/group/sci.electronics.repair/t/e5c475e0c3dc202a?hl=en
==============================================================================

== 1 of 1 ==
Date: Sun, Mar 13 2011 9:46 am
From: Lady Veteran

On Sat, 12 Mar 2011 22:09:40 +0000, "Harvey Daye, Jr"
<daytonbombers1976@gmail.com> wrote:

>Lady Veteran wrote:
>
>>
>> Sounds like you both are idiots. Any limp dick can call (or spread
>> innuendo about) a strong woman being a lesbian, but it only show how
>> intimidated they are and how obsessed they are about their erectile
>> dysfunction.
>>
>
>But the truth is you are a lesbian, and you even said so yourself.

But the truth is that you are lying out your corn hole. I am NOT gay.
>
>So whenever somebody tells the truth they are obsessed with their
>erectile dysfunction?
>
No. When idiots like you profess the "truth" one can bet that you are
lying.

If your lips are moving and your fingers moving on a keyboard-you are
lying.

>So what if I say that Mohammad was pedophile does that also mean that
>I'm obsessed with "my erectile dysfunction?"

Yes, because it is the only you implies can feel normal...You are a
liar and a thief.

>
>
>> The truth has never passed your lips and I think you should choke and
>> die if it did, so accustomed you are to LYING>
>>
>> LV
>>
LV

"I rode a tank and held a general's rank
When the blitzkrieg raged and the bodies stank."

---Sympathy for the Devil-The Rolling Stones
--------------------------------------------

"Only a male compensating for his impotence
would accuse a strong woman of being a lesbian."

---Unknown
----------------------------------------------

"It's a sign of your own worth sometimes if you are
hated by the right people."

---Miles Franklin
----------------------------------------------

See the latest idiot featured on my blog!

My Blog http://ladyveteranslog.blogspot.com
---------------------------------------------
Are you being harassed on Usenet and want to fight
back instead of leaving the net? Are you willing to
stand up to Internet bullies and stalkers?

Join my group http://groups.yahoo.com/group/antiCHU
----------------------------------------------

==============================================================================
TOPIC: ACTRESS SEXY VIDEOS - DATING TIPS - CHATTING HERE
http://groups.google.com/group/sci.electronics.repair/t/6da35dd429598cca?hl=en
==============================================================================

== 1 of 1 ==
Date: Sun, Mar 13 2011 11:12 am
From: success all

http://love4indianpeople.blogspot.com

==============================================================================
TOPIC: 2 fat wetbacks shake their daughter to death
http://groups.google.com/group/sci.electronics.repair/t/4b3401c02fc268a6?hl=en
==============================================================================

== 1 of 1 ==
Date: Sun, Mar 13 2011 5:39 am
From: Lady Veteran

http://www.rockdalecitizen.com/news/headlines/Two_arrested_in_childs_death_117657923.html

CONYERS — The mother and her boyfriend of a 3-year-old child are facing
murder and child cruelty charges in the recent shaking death of the toddler.

Conyers Police arrested Raul Solis, 20, and Yaneth DeLaCruz Alvarez, 21,
both of 1162 Oak Villas Court on March 8. Solis, the mother's boyfriend,
faces charges of felony murder and first-degree cruelty to children.
Alvarez, the mother, faces charges of second-degree cruelty to children.

Police Chief Gene Wilson and criminal investigations division commander
Lt. Jackie Dunn answered questions during a press conference Wednesday
afternoon.

Wilson said the charges stemmed from the death Sunday of 3-year-old Edna
Figueroa, Alvarez's daughter. Alvarez, along with her boyfriend, took
the girl to Rockdale Medical Center emergency room Saturday after the
girl was reportedly unconscious and unresponsive. The girl was taken to
Children's Healthcare of Atlanta at Egelston where she died.

"It was determined there that she had severe brain damage," Wilson said.
"She was put on life support and throughout the evening and into the
next day there were tests run and it was determined she was, in fact,
brain dead and the decision was made to take her off life support."

Autopsy and several witness statements led police to take warrants out
for Solis and Alvarez.

Solis reportedly admitted to shaking the little girl, as a means of
discipline for misbehaving. But he did not know he caused injury.

Investigators think the injury occurred about 10 a.m., according to
Dunn, and Alvarez and Solis likely discovered the child laying on the
floor about 1 or 2 p.m. Saturday, March 5. The little girl and her four
brothers, ages 5, 3 and 1, were reportedly unsupervised for about four
hours. During part of that four hours, police think the victim was
suffering brain hemorrhages from the shaking.

The mother was originally going to also be charged with murder.

"From our evidence and from our interviews, we feel like her part of
this was the fact that she just did not check on the children in that
four-hour period," Wilson said. "And that four-hour period was critical
to Edna."

Wilson said Solis was a legal resident and Alvarez was not. They have
one child together and have been living together for about a year and a
half.

Alvarez was arrested in 2004 for driving without a license. Solis was
arrested for human trafficking and identification issues in the past.

"He explained that he was arrested in Texas for smuggling illegal aliens
from Mexico into the United States," Dunn said.

Conyers Police had not responded to the home before. But Wilson said
investigators learned the victim tested positive for cocaine when she
was born and was taken away from the mother by Child Protective Services
in Texas. The little girl was returned to her mother in January.

The rest of the children are now in the custody of the Georgia
Department of Children and Family Services.

Solis and Alvarez are being held in Rockdale County Jail, awaiting a
bond hearing. They were taken to a custody hearing this morning in
Juvenile Court, relating to Texas Child Protective Services wanting to
take the other three children into custody.

Edna Figueroa, the victim, would have turned 4 years old on Thursday,
March 17.

LV
--

"I rode a tank and held a general's rank
When the blitzkrieg raged and the bodies stank."

---Sympathy for the Devil-The Rolling Stones
--------------------------------------------

"Only a male compensating for his impotence
would accuse a strong woman of being a lesbian."

---Unknown
----------------------------------------------

"It's a sign of your own worth sometimes if you are
hated by the right people."

---Miles Franklin
----------------------------------------------

See the latest idiot featured on my blog!

Join my group http://groups.yahoo.com/group/antiCHU
----------------------------------------------

==============================================================================
TOPIC: JTAG/Boundary Scan
http://groups.google.com/group/sci.electronics.repair/t/0bd7b46a47b4c9bc?hl=en
==============================================================================

== 1 of 1 ==
Date: Sun, Mar 13 2011 1:47 pm
From: "Charles"

I see that no one bit on your duplicate post on
news:sci.electronics.design Yup, not a single reply. Not surprised.

Most designs don't have enough spare flash for any diagnostics. It
isn't worth the trouble for anything outside a factory where an
automated test fixture can test the entire board without being
reprogrammed. Not what you want to hear, but it's the truth. The
'boundary' stops at the I/O pins where it was intended to. It was a way
to test a complex processor with limited tools, not an entire board.

I am guessing that the up-front costs for field service cannot be justified
(sold to management). Other than flash upgrades, it appears to be an
unfulfilled promise (pipe dream?) as far as field service is concerned.

Thanks.

==============================================================================
TOPIC: Two spooks rob taco bell and KFC
http://groups.google.com/group/sci.electronics.repair/t/371b2da23eedce93?hl=en
==============================================================================

== 1 of 2 ==
Date: Sun, Mar 13 2011 8:32 am
From: Lady Veteran

http://www.mercurynews.com/breaking-news/ci_17542421?nclick_check=1

By Eric Kurhi
Oakland Tribune
Posted: 03/04/2011 05:49:38 PM PST
Updated: 03/04/2011 05:49:39 PM PST

HAYWARD -- A fast-food restaurant in the Fairway Park shopping center
was held up by a pair of gunmen who forced eight terrified employees to
the ground before making off with cash from the manager's office around
10:15 p.m. Thursday, police said.

The men entered the Taco Bell-KFC on Mission Boulevard and forced
employees -- one who was off duty and picking up a paycheck -- to the
ground, some physically. A dishwasher had a gun thrust against her neck,
while a juvenile who tried to run slipped on the freshly mopped floor
and struck his head while falling to the ground.

Police said the duo was yelling orders and urging each other to get out
quickly.

They might have been driving a blue Honda Civic that pulled up to the
restaurant shortly before it was robbed, with an occupant of the car
asking if it was a slow night.

One robber was described as black, 18 to 20 years old, 5 foot 6 and 150
pounds, wearing a black mask with a skeletal design, a black hooded
sweatshirt, dark pants and black gloves.

The other was said to be black, in his mid-20s, 5 foot 9 with a medium
build, wearing a black ski mask, dark jacket and dark gloves.

Police are investigating whether another holdup minutes earlier by a
masked gunman at an Industrial Boulevard motel is related. In that case,
a single gunman leaped over the counter, demanding the clerk open the safe.

She said she didn't know how to open the safe, and the man took money
from the register and fled.

Anyone with information may call police at 510-293-7000.

Contact Eric Kurhi at 510-293-2473. Follow him at Twitter.com/erickurhi.
Read his blog at IBAbuzz.com/hayword.

"I rode a tank and held a general's rank
When the blitzkrieg raged and the bodies stank."

---Sympathy for the Devil-The Rolling Stones
--------------------------------------------

"Only a male compensating for his impotence
would accuse a strong woman of being a lesbian."

---Unknown
----------------------------------------------

"It's a sign of your own worth sometimes if you are
hated by the right people."

---Miles Franklin
----------------------------------------------

See the latest idiot featured on my blog!

Join my group http://groups.yahoo.com/group/antiCHU
----------------------------------------------

== 2 of 2 ==
Date: Sun, Mar 13 2011 6:15 pm
From: Tony

First thing Obama should've done when he got elected by niggers and the white
nigger lovers was build more prisons and courts for his countrymen.

Lady Veteran wrote:

> http://www.mercurynews.com/breaking-news/ci_17542421?nclick_check=1
>
> By Eric Kurhi
> Oakland Tribune
> Posted: 03/04/2011 05:49:38 PM PST
> Updated: 03/04/2011 05:49:39 PM PST
>
> HAYWARD -- A fast-food restaurant in the Fairway Park shopping center
> was held up by a pair of gunmen who forced eight terrified employees to
> the ground before making off with cash from the manager's office around
> 10:15 p.m. Thursday, police said.
>
> The men entered the Taco Bell-KFC on Mission Boulevard and forced
> employees -- one who was off duty and picking up a paycheck -- to the
> ground, some physically. A dishwasher had a gun thrust against her neck,
> while a juvenile who tried to run slipped on the freshly mopped floor
> and struck his head while falling to the ground.
>
> Police said the duo was yelling orders and urging each other to get out
> quickly.
>
> They might have been driving a blue Honda Civic that pulled up to the
> restaurant shortly before it was robbed, with an occupant of the car
> asking if it was a slow night.
>
> One robber was described as black, 18 to 20 years old, 5 foot 6 and 150
> pounds, wearing a black mask with a skeletal design, a black hooded
> sweatshirt, dark pants and black gloves.
>
> The other was said to be black, in his mid-20s, 5 foot 9 with a medium
> build, wearing a black ski mask, dark jacket and dark gloves.
>
> Police are investigating whether another holdup minutes earlier by a
> masked gunman at an Industrial Boulevard motel is related. In that case,
> a single gunman leaped over the counter, demanding the clerk open the safe.
>
> She said she didn't know how to open the safe, and the man took money
> from the register and fled.
>
> Anyone with information may call police at 510-293-7000.
>
> Contact Eric Kurhi at 510-293-2473. Follow him at Twitter.com/erickurhi.
> Read his blog at IBAbuzz.com/hayword.
>
> LV
>
> --
>
> "I rode a tank and held a general's rank
> When the blitzkrieg raged and the bodies stank."
>
> ---Sympathy for the Devil-The Rolling Stones
> --------------------------------------------
>
> "Only a male compensating for his impotence
> would accuse a strong woman of being a lesbian."
>
> ---Unknown
> ----------------------------------------------
>
> "It's a sign of your own worth sometimes if you are
> hated by the right people."
>
> ---Miles Franklin
> ----------------------------------------------
>
> See the latest idiot featured on my blog!
>
> My Blog http://ladyveteranslog.blogspot.com
> ---------------------------------------------
> Are you being harassed on Usenet and want to fight
> back instead of leaving the net? Are you willing to
> stand up to Internet bullies and stalkers?
>
> Join my group http://groups.yahoo.com/group/antiCHU
> ----------------------------------------------

--
The Grandmaster of the CyberFROG

Come get your ticket to CyberFROG city

Nay, Art thou decideth playeth ye simpleton games. *Some* of us know proper
manners

Very few. I used to take calls from *rank* noobs but got fired the first day on
the job for potty mouth,

Hamster isn't a newsreader it's a mistake!

El-Gonzo Jackson FROGS both me and Chuckcar

I hate them both, With useless bogus bullshit you need at least *three*
fulltime jobs to afford either one of them

I'm a fulltime text *only* man on usenet now. The rest of the world downloads
the binary files not me i can't afford thousands of dollars a month

UBB = User based bullFROGGING

Master Juba was a black man imitating a white man imitating a black man

Using my technical prowess and computer abilities to answer questions beyond
the realm of understandability

Regards Tony... Making usenet better for everyone everyday

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http://groups.google.com/group/sci.electronics.repair/t/cc50a9721aa2ce4a?hl=en
==============================================================================

== 1 of 1 ==
Date: Sun, Mar 13 2011 11:29 pm
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