pin cushion -- televison picture not fitting on screen

JR

unread,

Feb 28, 2003, 1:47:04 PM2/28/03

to

When I said that the corners of my TV picture screen were being "pulled" off
the screen someone told me that it might be the pin cushion. What is a pin
cushion and how hard are they to change? Can I do it myself? I have a RCA
F31700GG 35"

john

unread,

Feb 28, 2003, 2:57:33 PM2/28/03

to

What is the chassis number CTC xxxx ?

kip

"JR" <josh...@cox.net> wrote in message
news:I8O7a.88684$4F3.7...@news2.east.cox.net...

Jerry G.

unread,

Feb 28, 2003, 5:10:08 PM2/28/03

to

"Pin Cushion" is not a part. It is a reference to a complete area of
circuitry that controls the pin cushioning of the picture. It consists
of typically of many components. The circuit would have to be
troubleshooted to determine which ones have failed, and then replace
them. In many of these sets, some capacitors in this circuit area may
be the fault. But, the performance of the pin area should be proper
assessed to determine what the actual fault is, rather than guess at
probable components.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
==============================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
Instruments http://www.zoom-one.com/glgtech.htm
==============================================

"JR" <josh...@cox.net> wrote in message
news:I8O7a.88684$4F3.7...@news2.east.cox.net...

JR

unread,

Feb 28, 2003, 5:50:17 PM2/28/03

to

someone told me it was chassis 169 Does that help?

"john" <k...@istop.com> wrote in message
news:PaP7a.7943$x_5.9...@news20.bellglobal.com...

john

unread,

Feb 28, 2003, 5:59:38 PM2/28/03

to

Look on the rear of the TV its listed there along with the Model number.

kip
"JR" <josh...@cox.net> wrote in message

news:JIR7a.90765$4F3.7...@news2.east.cox.net...

john

unread,

Feb 28, 2003, 6:10:02 PM2/28/03

to

Ok ! Thats close enough ...
Measure the voltage on the center pin of the HOT
whilst the TV is in standby mode. Lets know what it is first.

kip

"JR" <josh...@cox.net> wrote in message

news:JIR7a.90765$4F3.7...@news2.east.cox.net...

Asimov

unread,

Feb 28, 2003, 7:42:04 PM2/28/03

to

"JR" wrote to "All" (28 Feb 03 18:47:04)
--- on the topic of "pin cushion -- televison picture not fitting on screen"

JR> From: "JR" <josh...@cox.net>
JR> When I said that the corners of my TV picture screen were being
JR> "pulled" off the screen someone told me that it might be the pin
JR> cushion. What is a pin cushion and how hard are they to change? Can I
JR> do it myself? I have a RCA F31700GG 35"

A "pincushion" is a reference to an early form of horizontal width
modulation circuit which used a transformer that felt just like a
"pincushion" whenever one inadvertantly touched it. ZAP!

Modern circuits don't use the transformer anymore, only a few diodes,
capacitors, and sometimes a saturated reactor (not the nuke kind <g>).
What the circuit does is to expand the width of the scanlines near the
middle so that the image has straight sides. A failed pincussion
correction circuit's typical symptom is the sides are bent inwards.

... You mean 15" sparks are SUPPOSED to come out of this thing?!?