HELP !!! Sony SSM-20N5U Question and VIDEO.

D

Donkey Box

Guest
Hi,


I have a Sony SSM-20N5U monitor in very good condition. The unit has
single problem:

I see some sort of vertical line snaking to better describe it looks
like some sort of vertical ondulation that is mostly noticeable on
sides of boxes lines or text.
I would describe this almost like a video noise.
This occurs even when there is no video input cables connected and the
monitor is displaying it's built in menu etc...


I WOULD LIKE TO KNOW WHAT's HAPPENING AND HOW CAN THIS BE FIXED.


I've attached a small video 3.9mb showing exactly what is happening.


http://members.core.com/99/D7/perrone/monitor/monitor2.wmv <-
double click here to play directly if you have a fast connection.


If you have slow connection or video above plays slowly, just click
below and save file to your desktop then play. Once the page is open
right click & select save as...

http://members.core.com/99/D7/perrone/monitor/


I have the tools(temp controlled station etc..) and good replacing
repairing, soldering skills but I lack the diagnostic and finding out
the problem part. If anyone can suggest some points for me to look at,
it would be great! Or perhaps which components are responsible for
this type of issue. I do have the service manual for this unit.


Thank you,


Kris
 
This looks like some high frequency noise coming back to the scan generator,
or the video drive amps. This can mostly be attributed to caps going too
high in ESR. Do an ESR test of all the electrolytic caps in the power
supply and in the horiz output stage, especially also on the secondary side
of the flyback outputs, that are doing some voltage source distribution.

You cannot see the defective caps visually, or check for high ESR on a
standard cap meter. If you do not want to invest in an ESR meter, you will
have to sub all the bypass and filter caps in the mentioned areas. There may
be a number of them that are out of specs. The hardway would be to use a
scope to find this, but the scope itself may be give some false noise if
this is radiating very strongly.

--

Greetings,

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


"Donkey Box" <ameritech@aol.net> wrote in message
news:gekg50d41r54fsa5ehonhavuh2devgdud6@4ax.com...
Hi,


I have a Sony SSM-20N5U monitor in very good condition. The unit has
single problem:

I see some sort of vertical line snaking to better describe it looks
like some sort of vertical ondulation that is mostly noticeable on
sides of boxes lines or text.
I would describe this almost like a video noise.
This occurs even when there is no video input cables connected and the
monitor is displaying it's built in menu etc...


I WOULD LIKE TO KNOW WHAT's HAPPENING AND HOW CAN THIS BE FIXED.


I've attached a small video 3.9mb showing exactly what is happening.


http://members.core.com/99/D7/perrone/monitor/monitor2.wmv <-
double click here to play directly if you have a fast connection.


If you have slow connection or video above plays slowly, just click
below and save file to your desktop then play. Once the page is open
right click & select save as...

http://members.core.com/99/D7/perrone/monitor/


I have the tools(temp controlled station etc..) and good replacing
repairing, soldering skills but I lack the diagnostic and finding out
the problem part. If anyone can suggest some points for me to look at,
it would be great! Or perhaps which components are responsible for
this type of issue. I do have the service manual for this unit.


Thank you,


Kris
 
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