sci.electronics.repair@googlegroups.com

Today's topics:

* Digital Optical to Analog Converter - 2 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/d6eac4949d838497?hl=en
* Fuse size in IBM ThinkPad T22 wallwart power supply - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/604b8d65c02e3a74?hl=en
* Is there some'secret' way to easily remove screw cap covers when
dissassembling? - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/c64bf4354664f1fc?hl=en
* Ion it USB turntable - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/0a4174ad69858759?hl=en

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TOPIC: Digital Optical to Analog Converter
http://groups.google.com/group/sci.electronics.repair/t/d6eac4949d838497?hl=en
==============================================================================

== 1 of 2 ==
Date: Thurs, Nov 17 2011 7:19 pm
From: "JohnC"

> I just purchased a Panasonic Viera Plasma TV model TC-P42S30. Since it
> has
> no analog audio out for my legacy stereo, I purchased a FiiO Optical to
> Audio Converter Model D3,
> http://www.fiio.com.cn/product/index.aspx?ID=33&MenuID=020302 .But when I
> hooked it up to the TV digital optical out, all I got was a pulsing sound
> from my stereo.. The digital to analog converter worked fine on when
> connected to the digital optical on the Blu-Ray but not on the Panasonic
> TV.

> I took the converter to the store where I purchased the TV and the sales
> rep
> connected it to a Panasonic TV and got the same results. Is this
> converter
> not able to decode the digital signal from Panasonic TVs? Can anyone
> recommend one that will work with my TV?

> John

"Klay Anderson" <klay@klay.com> wrote in message
news:25552311.108.1321569151620.JavaMail.geo-discussion-forums@prnv30...
> Nope. With TVs you have to use this:
>
> http://www.gefen.com/kvm/dproduct.jsp?prod_id=5980
>
> Text "Klay" to 50500 for contact info
>
> -.- .-.. .- -.-- / .- - / -.- .-.. .- -.-- / -.. --- - / -.-. --- --
> Yours truly,
>
> Mr. Klay Anderson, D.A.,Q.B.E.

I think that will do it. When RTFM (thanks spamtrap1888) the Panasonic will
provide Dolby Digital when an ATSC channel is selected and PCM when NTSC
channel is selected. I'm getting ATSC over the air so I need to convert
Dolby Digital. Looks like the Gefen unit will do this. I'll get it and
post back the results. BTW, I could find no menu option to change the
digital optical out fomat on the TV. Thanks to all for your help.

== 2 of 2 ==
Date: Thurs, Nov 17 2011 8:54 pm
From: stratus46@yahoo.com

On Nov 17, 3:44 am, "William Sommerwerck" <grizzledgee...@comcast.net>
wrote:
> A related issue...
>
> Though it's not the source of your problem, you might want to look into the
> possibility of ground loops, especially if you wind up making an analog
> connection between the Panasonic and your system.
>
> It's difficult to find RF isolation transformers for cable systems. MCM
> sells one -- the #33-8700 that seems to work okay. It's sometimes available
> for ~ $10. You might also want or need a double-F connector, #33-480.

I bought 2 of these directly from RMS for $5 each a couple of years
ago. They work very well. I had a hard time finding ANY 'galvanic
isolators'.

http://www.rmscommunications.net/pdf/MI2120VPG69&70.pdf

I had the very problem you're talking about and the isolators cleaned
all of it up. The problem was PCs in different rooms on different
branches and opposite phase connected by the antenna cables. The hum
was quite bad before the isolators.

G²

==============================================================================
TOPIC: Fuse size in IBM ThinkPad T22 wallwart power supply
http://groups.google.com/group/sci.electronics.repair/t/604b8d65c02e3a74?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Nov 17 2011 9:55 pm
From: Jeff Liebermann

On Thu, 17 Nov 2011 13:45:42 -0800 (PST), Robert Macy
<robert.a.macy@gmail.com> wrote:

>The laptop boots up, beeps because the date is set to 1981 [can't see
>the screen, backlight is OUT, just know the significance of the beep]
>Conclusion SMPS works, laptop basically works. just no screen!

Plug in an external monitor into the "VGA" connector.

>So following the T22 manual dissassembled down to the LCD screen,
>could not see anything that looked like liquid and dried salts, so
>don't know what's still wrong. Flushed with distilled water anywy and
>will let dry. Will see later if that brings it back.

Sigh. When the laptop recovers from the baptism, turn it on, and
shine a flashlight on the screen. Can you see the image of whatever
it's booting? You may need to move the flashlight around to see the
image. If it's visible, it's probably the inverter. However, if it
comes on with an orange glow, it's the CCFL lamps in the LCD panel.

>Is the 'inverter card' the ps for the backlight?

Yep. Google for "Thinkpad T22 LCD Inverter".
<www.ebay.com/sch/i.html?_nkw=thinkpad+t22+lcd+inverter>
About $6.00

>is it touchy and blows easily?

Yep. If you short it out with salt water and it can blow up. High
voltage does funny things to sensitive electronics.

>If I can find a way to remove the cap covers over the screws without
>destroying the cap covers,

The screw covers are made from sheet plastic and held in with rubber
cement. Pound a very small flat screwdriver between the screw cover
and the plastic frame, and pry upward.

>I'll take out the invreter board and look
>at it to see if any obvious damage. Or ohm out the terminals on the
>main switching transistor to see if it got toasted. Any ideas?

Find an AC voltmeter and measure the output voltage. For laptops, my
guess(tm) is about 500-800 VAC. Please remember that you have but one
life to give for your laptop.

Incidentally, the fan is often a problem on such Thinkpad laptops.

--
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

==============================================================================
TOPIC: Is there some'secret' way to easily remove screw cap covers when
dissassembling?
http://groups.google.com/group/sci.electronics.repair/t/c64bf4354664f1fc?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Nov 17 2011 10:05 pm
From: Jeff Liebermann

On Thu, 17 Nov 2011 13:27:31 -0800 (PST), Robert Macy
<robert.a.macy@gmail.com> wrote:

>Thus, the question, is there some secret to getting these cap covers
>out without destroying them?

Tiny screwdriver and pry up.

If you want to do it without destroying the screw cover, use a vacuum
pickup tool and vacuum pump:
<www.ebay.com/sch/i.html?_nkw=vacuum+pickup+pen>
Grab the screw cover near the edge and pull up. Don't try to pull on
the middle of the cover.

If you don't mind building a dedicated tip, a solder sucker might work
(I have't tried it).

--
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

==============================================================================
TOPIC: Ion it USB turntable
http://groups.google.com/group/sci.electronics.repair/t/0a4174ad69858759?hl=en
==============================================================================

== 1 of 1 ==
Date: Fri, Nov 18 2011 12:03 am
From: Peter Hill

On Thu, 17 Nov 2011 15:50:30 -0800 (PST), klem kedidelhopper
<captainvideo462009@gmail.com> wrote:

>On Nov 17, 6:03 pm, b <reverend_rog...@yahoo.com> wrote:
>> On Nov 16, 10:07 pm, klem kedidelhopper <captainvideo462...@gmail.com>
>> wrote:
>>
>> > Got this thing in for repair. It has no output from either the RCA
>> > cables on line or phono out or the USB out. The interface board has a
>> > great deal of smt circuitry on it and I'm thinking that this is
>> > probably a waste of time but I had to ask. Anyone ever worked on one
>> > of these? Thanks, Lenny
>>
>> If all else fails, bypass the circuitry and just wire the cartridge up
>> to the RCA output sockets, then you can use the deck like a 'normal
>> 'TT with any amp having a Phono input.
>>
>> -b
>
>I would do it if it was mine but I don't think the customer has a
>stereo system. Lenny

If they are making MP3s from vinyl they must have a computer to copy
the MP3s to a MP3 player.
It will have an audio input and sound recorder app.
So only need a codec to save the recorded input as an MP3. (which they
probably already have)
--
Peter Hill
Spamtrap reply domain as per NNTP-Posting-Host in header
Can of worms - what every fisherman wants.
Can of worms - what every PC owner gets!

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