sci.electronics.repair@googlegroups.com

Today's topics:

* JVC MXD 752 CD etc compact audio unit - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/8b7f65038283bf79?hl=en
* White coating over part of surface mount amp - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/150806fccb06a046?hl=en
* Blew another damn transformer on my Trane XB80 - 16 messages, 9 authors
http://groups.google.com/group/sci.electronics.repair/t/f883cd09a3a0b791?hl=en
* Help to identify capacitor please - 4 messages, 4 authors
http://groups.google.com/group/sci.electronics.repair/t/df081010fd20fad8?hl=en
* cheap wholesale soccer jersey baseball jerseys basketball jerseys NFL NBA
MLB NHL jersey free shipping paypal payment http://www.24hours-online.com - 1
messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/a181e86c3e9ceae6?hl=en
* LG refrigerator model LBN2251#** problems - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/a8a81578d072145d?hl=en
* Rigol scope LCD problem - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/f09ee6418c07d961?hl=en

==============================================================================
TOPIC: JVC MXD 752 CD etc compact audio unit
http://groups.google.com/group/sci.electronics.repair/t/8b7f65038283bf79?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, Apr 11 2011 12:45 am
From: "N_Cook"

could not find cause of intermittant lock-up of tray, so cut a neat hole in
the outer metal casing over the tray lock tabs that protrude outwards of the
deck section, perfectly safe area. Grommet strip edged around. Owner then
can manually unlock the tray and pull out the tray himself.

==============================================================================
TOPIC: White coating over part of surface mount amp
http://groups.google.com/group/sci.electronics.repair/t/150806fccb06a046?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, Apr 11 2011 4:23 am
From: "N_Cook"

Just as well I checked the ps underside for PbF problems, ok but one pcb
screw loose, no star washers or lacquer and the 1.5 inch fan although
turning, in its attitude you cannot see it was at half-cock. Another oddity
with this. One only of the main ps caps has a cable tie over a strip of
rubber wrapped around the cap. Cable tie just keeping the rubber in place
not tied to anything else. Some sort of anti-vibration damping? its the one
nearest the centre of the board.

==============================================================================
TOPIC: Blew another damn transformer on my Trane XB80
http://groups.google.com/group/sci.electronics.repair/t/f883cd09a3a0b791?hl=en
==============================================================================

== 1 of 16 ==
Date: Mon, Apr 11 2011 5:15 am
From: "Stormin Mormon"

What is this "old light bulb trick"?

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.

"Ron D." <ron.dozier@gmail.com> wrote in message
news:874969f6-f77c-41f5-8ed1-4c19d492f4fe@k9g2000yqi.googlegroups.com...
Put 3A automotive fuse on secondary. Use light bulb trick
to find
shorts. Two 12 V light bulbs in series that draw no more
than 40 VA.

== 2 of 16 ==
Date: Mon, Apr 11 2011 6:14 am
From: "Phil Allison"

"Stormin Mormon"
>
> What is this "old light bulb trick"?

** You need to ask Agent 86 that one....

... Phil

== 3 of 16 ==
Date: Mon, Apr 11 2011 8:12 am
From: Jeff Thies

On 4/10/2011 11:29 PM, Phil Allison wrote:
> "Jeff Thies"
>> Phil Allison wrote:
>>> "Jeff Thies"
>>> Phil Allison wrote:
>>>
>>>>>>> I suggest you provide the next replacement for that vulnerable tranny
>>>>>>> with
>>>>>>> some "protection" - firstly an in-line fuse of say 1/4 amp AND a
>>>>>>> capacitor wired across the primary of say 1uF rated for continuous
>>>>>>> use
>>>>>>> across the AC supply.
>>>>>>>
>>>>>>> If there is an overload on the tranny, the fuse will blow.
>>>>>>>
>>>>>>> The 1uF capacitor should suppress spike voltages enough to save the
>>>>>>> tranny from harm.
>>>>>>
>>>>>> 1 uF sounds a little high.
>>>>>
>>>>>
>>>>> ** No it ain't.
>>>>
>>>> I thought you had simply misspoke and that this was an honest error.
>>>>
>>>> The reactance of a 1uF cap at 60Hz is: 2652 ohms (1/(2*pi*F*C)
>>>> Online calculator:
>>>> http://www.kusashi.com/reactance-c.php?f=60&c=1&stage=results
>>>>
>>>> V^2/R = W
>>>>
>>>> Assuming primary, as why would you put it on the secondary:
>>>>
>>>> 120^2 / 2652 = 5.43 W
>>>>
>>>> Does that not seem wrong to you?
>>>
>>> ** Completely.
>>>
>>> Such a cap dissipates no energy at all.
>>>
>>> What planet do you come from ??
>>
>> What a jerk you are. You do realize that is 45mA running through that.
>
>
> ** What sort of know nothing JERK thinks that capacitors dissipate energy
> ??

It doesn't have to dissipate energy to explode. That is a lot of joules.
>
> Then proceeds to calculate the reactive impedance and treat it the same as
> resistance ??
>
> Big bad.

So I left out the PF, so what?
>
> Zero out of ten.

My first encounter with you, but no doubt others have had the same
reaction. Telling an inexperienced OP to put in a 1mF cap without any
specifics, and that for the dubious goal of "suppressing" the back EMF
of a motor running off the line has a disconnect from reality.
Transformers are generally much hardier devices than the solid state
components they feed.

Say what you want. You've already made your mark and I really don't
care what you add. I've taken away what I need to know about yourself,
and the OP is off somewhere else.

Happy now?

Jeff
>
>
> .... Phil
>
>
>
>

== 4 of 16 ==
Date: Mon, Apr 11 2011 8:25 am
From: Smitty Two

In article <inv5oj$nkt$1@news.albasani.net>,
Jeff Thies <jeff_thies@att.net> wrote:

> My first encounter with you

Jeff, since you don't hang out on s.e.r., I'll clue you in about Phil.
Regardless of what he knows or doesn't know, he calls everyone a
fuckwit, and worse, all the time. Virtually every sentence of every post
is chock full of derision. If you choose to dialogue with him, you'll
get great heaping portions of his demented abuse. So don't take it
personally.

== 5 of 16 ==
Date: Mon, Apr 11 2011 9:57 am
From: Jeff Thies

On 4/11/2011 11:25 AM, Smitty Two wrote:
> In article<inv5oj$nkt$1@news.albasani.net>,
> Jeff Thies<jeff_thies@att.net> wrote:
>
>> My first encounter with you
>
> Jeff, since you don't hang out on s.e.r., I'll clue you in about Phil.
> Regardless of what he knows or doesn't know, he calls everyone a
> fuckwit, and worse, all the time. Virtually every sentence of every post
> is chock full of derision. If you choose to dialogue with him, you'll
> get great heaping portions of his demented abuse. So don't take it
> personally.

Thanks. That's about what I surmised. A North American version of Rod
Speed.

Some people I'll read consistently, I'll put him in the other group.

Jeff

== 6 of 16 ==
Date: Mon, Apr 11 2011 11:30 am
From: David Nebenzahl

On 4/11/2011 8:25 AM Smitty Two spake thus:

> In article <inv5oj$nkt$1@news.albasani.net>,
> Jeff Thies <jeff_thies@att.net> wrote:
>
>> My first encounter with you
>
> Jeff, since you don't hang out on s.e.r., I'll clue you in about Phil.
> Regardless of what he knows or doesn't know, he calls everyone a
> fuckwit, and worse, all the time. Virtually every sentence of every post
> is chock full of derision. If you choose to dialogue with him, you'll
> get great heaping portions of his demented abuse. So don't take it
> personally.

That's true, and it's also true that he often acts--seriously, no
joke--like he's off his meds.

But it's also true that he knows more about electronics than probably
all the "experts" here (a.h.r.) put together. And it is possible to
engage him in serious dialog on electronic topics, as shown by recent
threads in s.e.r. So while he can be abusive, you ought to listen to his
technical advice, which is golden.

--
The current state of literacy in our advanced civilization:

yo
wassup
nuttin
wan2 hang
k
where
here
k
l8tr
by

- from Usenet (what's *that*?)

== 7 of 16 ==
Date: Mon, Apr 11 2011 11:46 am
From: Meat Plow

On Mon, 11 Apr 2011 11:30:33 -0700, David Nebenzahl wrote:

> On 4/11/2011 8:25 AM Smitty Two spake thus:
>
>> In article <inv5oj$nkt$1@news.albasani.net>,
>> Jeff Thies <jeff_thies@att.net> wrote:
>>
>>> My first encounter with you
>>
>> Jeff, since you don't hang out on s.e.r., I'll clue you in about Phil.
>> Regardless of what he knows or doesn't know, he calls everyone a
>> fuckwit, and worse, all the time. Virtually every sentence of every
>> post is chock full of derision. If you choose to dialogue with him,
>> you'll get great heaping portions of his demented abuse. So don't take
>> it personally.
>
> That's true, and it's also true that he often acts--seriously, no
> joke--like he's off his meds.
>
> But it's also true that he knows more about electronics than probably
> all the "experts" here (a.h.r.) put together.

That's debatable. Phil is a troll with decent knowledge in electronics.
He sets traps like a spider spins a web then comes back to pounce on
those in the trap. I think Phil gets a lot of his knowledge on Google.

--
Live Fast Die Young, Leave A Pretty Corpse

== 8 of 16 ==
Date: Mon, Apr 11 2011 12:08 pm
From: The Daring Dufas

On 4/11/2011 1:46 PM, Meat Plow wrote:
> On Mon, 11 Apr 2011 11:30:33 -0700, David Nebenzahl wrote:
>
>> On 4/11/2011 8:25 AM Smitty Two spake thus:
>>
>>> In article<inv5oj$nkt$1@news.albasani.net>,
>>> Jeff Thies<jeff_thies@att.net> wrote:
>>>
>>>> My first encounter with you
>>>
>>> Jeff, since you don't hang out on s.e.r., I'll clue you in about Phil.
>>> Regardless of what he knows or doesn't know, he calls everyone a
>>> fuckwit, and worse, all the time. Virtually every sentence of every
>>> post is chock full of derision. If you choose to dialogue with him,
>>> you'll get great heaping portions of his demented abuse. So don't take
>>> it personally.
>>
>> That's true, and it's also true that he often acts--seriously, no
>> joke--like he's off his meds.
>>
>> But it's also true that he knows more about electronics than probably
>> all the "experts" here (a.h.r.) put together.
>
> That's debatable. Phil is a troll with decent knowledge in electronics.
> He sets traps like a spider spins a web then comes back to pounce on
> those in the trap. I think Phil gets a lot of his knowledge on Google.
>

Google? Is that some new kind of mind altering drug? ^_^

TDD

== 9 of 16 ==
Date: Mon, Apr 11 2011 12:18 pm
From: Meat Plow

On Mon, 11 Apr 2011 14:08:47 -0500, The Daring Dufas wrote:

> On 4/11/2011 1:46 PM, Meat Plow wrote:
>> On Mon, 11 Apr 2011 11:30:33 -0700, David Nebenzahl wrote:
>>
>>> On 4/11/2011 8:25 AM Smitty Two spake thus:
>>>
>>>> In article<inv5oj$nkt$1@news.albasani.net>,
>>>> Jeff Thies<jeff_thies@att.net> wrote:
>>>>
>>>>> My first encounter with you
>>>>
>>>> Jeff, since you don't hang out on s.e.r., I'll clue you in about
>>>> Phil. Regardless of what he knows or doesn't know, he calls everyone
>>>> a fuckwit, and worse, all the time. Virtually every sentence of every
>>>> post is chock full of derision. If you choose to dialogue with him,
>>>> you'll get great heaping portions of his demented abuse. So don't
>>>> take it personally.
>>>
>>> That's true, and it's also true that he often acts--seriously, no
>>> joke--like he's off his meds.
>>>
>>> But it's also true that he knows more about electronics than probably
>>> all the "experts" here (a.h.r.) put together.
>>
>> That's debatable. Phil is a troll with decent knowledge in electronics.
>> He sets traps like a spider spins a web then comes back to pounce on
>> those in the trap. I think Phil gets a lot of his knowledge on Google.
>>
>>
> Google? Is that some new kind of mind altering drug? ^_^
>
> TDD

Sometimes it seems that's the case.

--
Live Fast Die Young, Leave A Pretty Corpse

== 10 of 16 ==
Date: Mon, Apr 11 2011 12:28 pm
From: Jeff Thies

On 4/11/2011 2:46 PM, Meat Plow wrote:
> On Mon, 11 Apr 2011 11:30:33 -0700, David Nebenzahl wrote:
>
>> On 4/11/2011 8:25 AM Smitty Two spake thus:
>>
>>> In article<inv5oj$nkt$1@news.albasani.net>,
>>> Jeff Thies<jeff_thies@att.net> wrote:
>>>
>>>> My first encounter with you
>>>
>>> Jeff, since you don't hang out on s.e.r., I'll clue you in about Phil.
>>> Regardless of what he knows or doesn't know, he calls everyone a
>>> fuckwit, and worse, all the time. Virtually every sentence of every
>>> post is chock full of derision. If you choose to dialogue with him,
>>> you'll get great heaping portions of his demented abuse. So don't take
>>> it personally.
>>
>> That's true, and it's also true that he often acts--seriously, no
>> joke--like he's off his meds.
>>
>> But it's also true that he knows more about electronics than probably
>> all the "experts" here (a.h.r.) put together.
>
> That's debatable. Phil is a troll

he does have the outward symptoms.

with decent knowledge in electronics.
> He sets traps like a spider spins a web then comes back to pounce on
> those in the trap.

I have no time for playing games. Anyone sending me down that path is
not worth the time consumed.

I think he is more than a little looney about the whole 1mF cap
business. Not that I'm an expert on appliances but there are plenty of
good reasons why such a thing is not used in other commercial and home
electronics. I've been inside thousands of different line driven
electronics and I've never seen anyone reflect his thinking. It makes me
doubt his practical background, and that is an understatement.

I think Phil gets a lot of his knowledge on Google.

Not a clue on that. I'll leave him in your group where he can foster
as much contempt as he desires.

Jeff
>
>
>

== 11 of 16 ==
Date: Mon, Apr 11 2011 12:53 pm
From: Meat Plow

On Mon, 11 Apr 2011 15:28:09 -0400, Jeff Thies wrote:

> On 4/11/2011 2:46 PM, Meat Plow wrote:
>> On Mon, 11 Apr 2011 11:30:33 -0700, David Nebenzahl wrote:
>>
>>> On 4/11/2011 8:25 AM Smitty Two spake thus:
>>>
>>>> In article<inv5oj$nkt$1@news.albasani.net>,
>>>> Jeff Thies<jeff_thies@att.net> wrote:
>>>>
>>>>> My first encounter with you
>>>>
>>>> Jeff, since you don't hang out on s.e.r., I'll clue you in about
>>>> Phil. Regardless of what he knows or doesn't know, he calls everyone
>>>> a fuckwit, and worse, all the time. Virtually every sentence of every
>>>> post is chock full of derision. If you choose to dialogue with him,
>>>> you'll get great heaping portions of his demented abuse. So don't
>>>> take it personally.
>>>
>>> That's true, and it's also true that he often acts--seriously, no
>>> joke--like he's off his meds.
>>>
>>> But it's also true that he knows more about electronics than probably
>>> all the "experts" here (a.h.r.) put together.
>>
>> That's debatable. Phil is a troll
>
> he does have the outward symptoms.
>
> with decent knowledge in electronics.
>> He sets traps like a spider spins a web then comes back to pounce on
>> those in the trap.
>
> I have no time for playing games. Anyone sending me down that path is
> not worth the time consumed.
>
> I think he is more than a little looney about the whole 1mF cap
> business. Not that I'm an expert on appliances but there are plenty of
> good reasons why such a thing is not used in other commercial and home
> electronics. I've been inside thousands of different line driven
> electronics and I've never seen anyone reflect his thinking. It makes me
> doubt his practical background, and that is an understatement.
>
>
> I think Phil gets a lot of his knowledge on Google.
>
> Not a clue on that. I'll leave him in your group where he can foster
> as much contempt as he desires.
>

The sad part is Phil usually is right with things involving pro-audio
gear. I would take his word hands down on guitar and power amps. But you
cannot know everything about any kind of electronic device like he would
like others to believe he does. And why he traps people with one decent
reply then comes back scathing is beyond me.

--
Live Fast Die Young, Leave A Pretty Corpse

== 12 of 16 ==
Date: Mon, Apr 11 2011 12:58 pm
From: John Robertson

Stormin Mormon wrote:
> What is this "old light bulb trick"?
>

Wire a 25W - 75W incandescent light bulb in series with the load
(transformer primary). If the light is bright then there is a short in
either the primary or secondary side output. If it is bright for a
second then dims right down (power supply caps charging up) then there
is no serious short.

Picture of one such setup:

http://www.flippers.com/images/OvercurrentTestJigFused.JPG

Note I recommend an isolation transformer. The fuse holder is there so
the light can act as an indicator that the fuse has blown, or remove the
fuse for "the light bulb test/trick".

John :-#)#

--
(Please post followups or tech enquiries to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

== 13 of 16 ==
Date: Mon, Apr 11 2011 4:02 pm
From: "Phil Allison"

"Jeff Thies"
Phil Allison
>
>> ** What sort of know nothing JERK thinks that capacitors dissipate
>> energy
>> ??
>>
>> Then proceeds to calculate the reactive impedance and treat it the same
>> as
>> resistance ??
>>
>> Big bad.
>
>> Zero out of ten.

** Jeff - you are much worse than merely a know nothing idiot.

You are one colossally narcissistic fool and a public menace.

God knows what it is you DO know something about - but certainly
electricity and electronics are not among them.

Piss off and stop TROLLING .

.... Phil

== 14 of 16 ==
Date: Mon, Apr 11 2011 4:04 pm
From: "Phil Allison"

"Smitty Shitty Two"

> Jeff Thies
>
>> My first encounter with you
>
> Jeff, since you don't hang out on s.e.r., I'll clue you in about Phil.

**As if you have the metal capacity for any such thing.

> Regardless of what he knows or doesn't know, he calls everyone a
> fuckwit, and worse, all the time.

** Blatant lies.

I only call fuckwits fuckwits.

Shame is, the whole of usenet has been taken over by them.

.... Phil

== 15 of 16 ==
Date: Mon, Apr 11 2011 4:10 pm
From: "Phil Allison"

"Jeff Thies is a Moron "

** Piss off - you fuckwit WANKER !!!

> I think he is more than a little looney about the whole 1mF cap business.

** FFS IMBECILE -

I suggested a capacitor of " 1uF rated for continuous use across the AC
supply"

Standard practice with inductive loads for decades.

> Not that I'm an expert on appliances ...

** Only thing a fool like YOU is expert on is puling your tiny cock in
public.

FUCK OFF - DAMN TROLL !!

== 16 of 16 ==
Date: Mon, Apr 11 2011 4:26 pm
From: don@manx.misty.com (Don Klipstein)

In <intmki$cmm$1@news.albasani.net>, Jeff Thies wrote:

<SNIP to getting a nonpolarized 1uF cap suitable for 120 VAC>

>If not then go buy a 200V non polarized 1uF cap. It is no easy chore.
>
>http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=131081

200V DC rating is not enough, despite 120 VAC having a peak voltage
of only 169 volts.

AC does make things worse, by rapidly repeated severe voltage swings
combined with some development of heat.

The capacitor needs to have an actual AC rating, and one that includes
your AC voltage with a comfortable safety margin. If it has a DC rating,
chances are that will be around 400 volts DC. And not every cap rated
400 VDC is dsafe for use with 120 VAC, even if non-polarized.

Preferably, it should be "UL recognized" or the like, for some assurance
that it is reasonably reliable against failure, or at least an unsafe
failure.

Back in the early 1980's, in an experimental sodium lamp ballast, I have
blown an 800VDC cap and two 600 VDC ones with 240-260 VAC 60 Hz with less
than 10 operating hours of this combined among the three of them. One of
those capacitor blowups was a spectacular one that left a major oil stain
on the ceiling above. I learned the hard way that actual AC ratings are
required here.

===================================

One more thing: If there is a switch upstream of a capacitor across a
power line, then the switch may be in for severe contact pitting.

Then again, I doubt a voltage spike lasting long enough to burn out a
transformer will be absorbed by a 1 uF cap across a 120V AC line.

I would lean to looking for intermittent overload by the transformer's
load, the transformer's load intermittently drawing a large amount of DC
(such as by failing-open one diode in a bridge rectifier).

Or, the transformer being connected incorrectly.

(Such as a 120V/240V one with 2 primary winding sections needing both
primary sections to be connected in parallel with each other for full
power handling at 120V, but only 1 of them is being used.)

--
- Don Klipstein (don@misty.com)

==============================================================================
TOPIC: Help to identify capacitor please
http://groups.google.com/group/sci.electronics.repair/t/df081010fd20fad8?hl=en
==============================================================================

== 1 of 4 ==
Date: Mon, Apr 11 2011 4:21 am
From: Markt

Please can anyone help me to identify a capacitor.

It is fitted to an MK Sentry RCD socket, it is fitted in position C6 and
is used as the mains dropper to power the RCD circuitry.

It's only markings are 334K250 on the top line and NIS~S82 on the bottom
line.

The socket has an active RCD and the Reset button will not hold in. I
think that not enough voltage is being applied to the circuit, because
if I apply 18V dc to the circuit it will latch the solenoid, but out of
the mains derived supply I am only getting about 10V.

TIA

Mark

--
Markt

== 2 of 4 ==
Date: Mon, Apr 11 2011 7:19 am
From: "N_Cook"

Markt <Markt.7e8c1e8@diybanter.com> wrote in message
news:Markt.7e8c1e8@diybanter.com...
>
> Please can anyone help me to identify a capacitor.
>
> It is fitted to an MK Sentry RCD socket, it is fitted in position C6 and
> is used as the mains dropper to power the RCD circuitry.
>
> It's only markings are 334K250 on the top line and NIS~S82 on the bottom
> line.
>
> The socket has an active RCD and the Reset button will not hold in. I
> think that not enough voltage is being applied to the circuit, because
> if I apply 18V dc to the circuit it will latch the solenoid, but out of
> the mains derived supply I am only getting about 10V.
>
> TIA
>
> Mark
>
>
>
>
> --
> Markt

33* 10^4 pico farad, 250V but would have to be self-healing type, not
polyester

== 3 of 4 ==
Date: Mon, Apr 11 2011 7:43 am
From: boardjunkie1

On Apr 11, 7:21 am, Markt <Markt.7e8c...@diybanter.com> wrote:
> Please can anyone help me to identify a capacitor.
>
> It is fitted to an MK Sentry RCD socket, it is fitted in position C6 and
> is used as the mains dropper to power the RCD circuitry.
>
> It's only markings are 334K250 on the top line and NIS~S82 on the bottom
> line.
>
> The socket has an active RCD and the Reset button will not hold in. I
> think that not enough voltage is being applied to the circuit, because
> if I apply 18V dc to the circuit it will latch the solenoid, but out of
> the mains derived supply I am only getting about 10V.
>
> TIA
>
> Mark
>
> --
> Markt

.33uF 250v

== 4 of 4 ==
Date: Mon, Apr 11 2011 4:26 pm
From: "Phil Allison"

"Markt"
> Please can anyone help me to identify a capacitor.
>
> It is fitted to an MK Sentry RCD socket, it is fitted in position C6 and
> is used as the mains dropper to power the RCD circuitry.
>
> It's only markings are 334K250 on the top line and NIS~S82 on the bottom
> line.
>

** Its a 330 nF cap rated at 250 volts DC - a very poor choice by the maker.

..... Phil

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TOPIC: cheap wholesale soccer jersey baseball jerseys basketball jerseys NFL
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http://groups.google.com/group/sci.electronics.repair/t/a181e86c3e9ceae6?hl=en
==============================================================================

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==============================================================================
TOPIC: LG refrigerator model LBN2251#** problems
http://groups.google.com/group/sci.electronics.repair/t/a8a81578d072145d?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, Apr 11 2011 8:53 am
From: nesesu

On Apr 10, 10:08 pm, Geoff <y...@email.com> wrote:
> klem kedidelhopper <captainvideo462...@gmail.com> wrote in news:dd664d3b-
> 3c48-492b-b116-20f9a8e7e...@v10g2000yqn.googlegroups.com:
>
> > The refrigerator section is running at about 46 degrees and the
> > freezer is at 42. We cleaned all the dust out of the back and there
> > doesn't seem to be any improvement. I am an electronics technician
> > however I don't know too much about refrigerators. All the food is
> > spoiling and I' hope that someone can please point me in the right
> > direction to troubleshoot this thing. We had a GE for 22 years and
> > against my better judgment had to get rid of it because my wife didn't
> > like the rust on the bottom. Now we're stuck with this non functioning
> > pos. Thanks for any assistance. Lenny
>
> Could be failure of defrost system, even if compressor is running. You can
> check by removing the cover in the back of the freezer section, if that is
> how you get to the freezer coill thingies, the aluminium bits.
>
> This causes the ice that is there to slow the flow of air from the fans to
> the fridge compartments. Next step is to find out why, if this is
> happening.

My Maytag uses an electronic "Adaptive Defrost Controller". This PC
board is located in the upper right of the refridgerator compartment
and ceased working a couple of years ago with the exact symptoms
described by the OP. I had a tech come in and replace it [$150] but
kept the old one to see what had happened. It turned out that the bulk
filter cap [22uF 50V electrolytic] had gone high ESR, so I replaced it
with a new high ripple cap and put the board away. A week or so ago I
heard a buzzing like a chattering relay from the 'fridge and went a
pressed on the panel in the freezer that covers the evaporator and
felt frost on the coil so I guessed that the replacement board cap was
failing. I went on line to find the instruction on how to access that
board in my model and took it out and to the bench. Indeed tha same
cap was high ESR, so I replaced it and then reinstalled the board into
the 'fridge. Total time from start to finish of the removal, repair
and re-installation was about 30 minutes. Problem seems to be
resolved. So, if you have the same board [it seems to be used across
many brands], you should not need to spend $43 for a new one, just
replace the 22u cap with a better quality one.
Neil S.

==============================================================================
TOPIC: Rigol scope LCD problem
http://groups.google.com/group/sci.electronics.repair/t/f09ee6418c07d961?hl=en
==============================================================================

== 1 of 1 ==
Date: Mon, Apr 11 2011 2:42 pm
From: Jamie

a7yvm109gf5d1@netzero.com wrote:

> DS5102C, color LCD scope. When turned on, the leftmost quarter has
> vertical stripes, the affected column is dead.
>
> It looks like specific sub-pixels are not responding. R in one row is
> dead, then G a few rows down, then B, repeat 10 times.
>
> http://img593.imageshack.us/i/rigollcdscreen.jpg/
>
> Thing is, after a few hour warm up, it works normally.
>
> What is the most likely suspect before I go in and strip it down? Is
> it likely to be simply a bad harness somewhere that needs reseating?
> Or do I need to take apart the panel and fiddle arround with something
> more arcane?
>
> I don't think there's zebra strips in these things these days.
I wouldn't put it past them to have zebra strips in there how ever,
since they can't use leaded solder any more in production items it's
very possible you have a solder joint issue in the screen itself or it
could be the header on your board.

Use circuit cooler on suspected areas after warm up to recreate the
problem.

Jamie

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