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Connection Monitor to PC ???



 
 
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  #1  
Old October 18th 18, 01:01 AM posted to alt.comp.hardware
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Posts: 13
Default Connection Monitor to PC ???

I discovered something that surprised me - maybe someone can tell me
why?

I connected my monitor to two PCs, one DVI, the other VGA. I planned
to used my two PCs together, but never at same time. Guess what? My
PC connected with VGA worked alone. buy stopped working once I
connected the DVI cable. The DVI PC worked fine. I even unplugged
power to the DVI PC!! Now I am plugged to only the VGA PC and all is
fine. What don't I understand?

This is all because my MINIVIEW SYMPATH 4-VGA-PC
monitor-mouse-keyboard-connector quit working after several years use.
Just quit. Further, my cables no longer want to want on the Sympathy.
Seems strange.

I am discouraged to say the least.

Johnny
  #2  
Old October 18th 18, 03:46 AM posted to alt.comp.hardware
Paul[_26_]
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Posts: 832
Default Connection Monitor to PC ???

wrote:
I discovered something that surprised me - maybe someone can tell me
why?

I connected my monitor to two PCs, one DVI, the other VGA. I planned
to used my two PCs together, but never at same time. Guess what? My
PC connected with VGA worked alone. buy stopped working once I
connected the DVI cable. The DVI PC worked fine. I even unplugged
power to the DVI PC!! Now I am plugged to only the VGA PC and all is
fine. What don't I understand?

This is all because my MINIVIEW SYMPATH 4-VGA-PC
monitor-mouse-keyboard-connector quit working after several years use.
Just quit. Further, my cables no longer want to want on the Sympathy.
Seems strange.

I am discouraged to say the least.

Johnny


They share some resource they were not supposed to have shared.

If this was my kit to debug, I'd have the ohmmeter out and have
all three devices disconnected from power. See whether the VGA pins
on the DVI-I connector on the monitor, are in common with the
VGA pins on the VGA connector on the monitor. The two monitor connectors
could also share a common SDA/SCK (serial bus for EDID monitor resolution
info).

Using the make and model number of LCD monitor, I would be looking
for Newegg customer reviews for this particular monitor. Someone else
will have seen this happen.

Paul
  #3  
Old October 18th 18, 10:10 AM posted to alt.comp.hardware
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Posts: 13
Default Connection Monitor to PC ???

On Wed, 17 Oct 2018 22:46:52 -0400, Paul
wrote:

wrote:
I discovered something that surprised me - maybe someone can tell me
why?

I connected my monitor to two PCs, one DVI, the other VGA. I planned
to used my two PCs together, but never at same time. Guess what? My
PC connected with VGA worked alone. buy stopped working once I
connected the DVI cable. The DVI PC worked fine. I even unplugged
power to the DVI PC!! Now I am plugged to only the VGA PC and all is
fine. What don't I understand?

This is all because my MINIVIEW SYMPATH 4-VGA-PC
monitor-mouse-keyboard-connector quit working after several years use.
Just quit. Further, my cables no longer want to want on the Sympathy.
Seems strange.

I am discouraged to say the least.

Johnny


They share some resource they were not supposed to have shared.

If this was my kit to debug, I'd have the ohmmeter out and have
all three devices disconnected from power. See whether the VGA pins
on the DVI-I connector on the monitor, are in common with the
VGA pins on the VGA connector on the monitor. The two monitor connectors
could also share a common SDA/SCK (serial bus for EDID monitor resolution
info).

Using the make and model number of LCD monitor, I would be looking
for Newegg customer reviews for this particular monitor. Someone else
will have seen this happen.

Paul


Then maybe what I canf irst try is a second monitor I have?
J
  #4  
Old October 18th 18, 10:26 AM posted to alt.comp.hardware
[email protected]
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Posts: 13
Default Connection Monitor to PC ???

On Wed, 17 Oct 2018 22:46:52 -0400, Paul
wrote:

wrote:
I discovered something that surprised me - maybe someone can tell me
why?

I connected my monitor to two PCs, one DVI, the other VGA. I planned
to used my two PCs together, but never at same time. Guess what? My
PC connected with VGA worked alone. buy stopped working once I
connected the DVI cable. The DVI PC worked fine. I even unplugged
power to the DVI PC!! Now I am plugged to only the VGA PC and all is
fine. What don't I understand?

This is all because my MINIVIEW SYMPATH 4-VGA-PC
monitor-mouse-keyboard-connector quit working after several years use.
Just quit. Further, my cables no longer want to want on the Sympathy.
Seems strange.

I am discouraged to say the least.

Johnny


They share some resource they were not supposed to have shared.

If this was my kit to debug, I'd have the ohmmeter out and have
all three devices disconnected from power. See whether the VGA pins
on the DVI-I connector on the monitor, are in common with the
VGA pins on the VGA connector on the monitor. The two monitor connectors
could also share a common SDA/SCK (serial bus for EDID monitor resolution
info).

Using the make and model number of LCD monitor, I would be looking
for Newegg customer reviews for this particular monitor. Someone else
will have seen this happen.

Paul


Of course none of this would have happened if my 5 year old my
MINIVIEW SYMPATH 4-VGA-PC monitor-mouse-keyboard-connector no longer
seems to handle the VGA cables I have been using. Strange.
The cable ends now won't fit on the connector. All 4 of 'em. Looks
like someone sat on them but I know noone did. All was okay until I
dismantled and moved all my computer stuff to another room Then I cud
not re-assemble things. I don't understand why things are the way
they are. And then the fact that I cud not connect 2 monitors really
threw me. Life can be strange.

J
  #5  
Old October 18th 18, 10:31 AM posted to alt.comp.hardware
Paul[_26_]
external usenet poster
 
Posts: 832
Default Connection Monitor to PC ???

wrote:
On Wed, 17 Oct 2018 22:46:52 -0400, Paul
wrote:

wrote:
I discovered something that surprised me - maybe someone can tell me
why?

I connected my monitor to two PCs, one DVI, the other VGA. I planned
to used my two PCs together, but never at same time. Guess what? My
PC connected with VGA worked alone. buy stopped working once I
connected the DVI cable. The DVI PC worked fine. I even unplugged
power to the DVI PC!! Now I am plugged to only the VGA PC and all is
fine. What don't I understand?

This is all because my MINIVIEW SYMPATH 4-VGA-PC
monitor-mouse-keyboard-connector quit working after several years use.
Just quit. Further, my cables no longer want to want on the Sympathy.
Seems strange.

I am discouraged to say the least.

Johnny

They share some resource they were not supposed to have shared.

If this was my kit to debug, I'd have the ohmmeter out and have
all three devices disconnected from power. See whether the VGA pins
on the DVI-I connector on the monitor, are in common with the
VGA pins on the VGA connector on the monitor. The two monitor connectors
could also share a common SDA/SCK (serial bus for EDID monitor resolution
info).

Using the make and model number of LCD monitor, I would be looking
for Newegg customer reviews for this particular monitor. Someone else
will have seen this happen.

Paul


Then maybe what I canf irst try is a second monitor I have?
J


My theory is, that there is some "sharing" between the two
connectors on the monitor, on the inside. Maybe SDA/SCK are
shared, or maybe the DVI-I and its VGA pins are shorted
to the VGA pins on the LCD monitor VGA connector. Neither
scheme is guaranteed to cause a black screen, but that's
about the only thing I could think of, where they'd be
joined together.
(Inside)
Computer #1 -------- VGA --------- ----+--- LCD Monitor
|
Computer #2 -------- DVI-I ------- ----+

I don't know how a second mystery monitor will help
this situation. Sure, you can run two computers
and two monitors, but there would not be much mystery
if you do this. Just more desk space.

Computer #1 -------- VGA --------- LCD Monitor #1

Computer #2 -------- DVI-I ------- LCD Monitor #2

What did you have in mind as a test case with the
second monitor ? Does the second monitor have its
own VGA and DVI-D input.

The computer end would typically be DVI-I. That has
both DVI-D and VGA pins on it, and supports either.
Usually, the DVI cable has DVI-D on the end for
the monitor, and in such a case, there's no continuity
on the VGA blades on the DVI-I connector. The input
on the monitor end should be DVI-D (digital only).

Wikipedia has an article on both DVI and VGA, if you
need pinouts. There might be as many as five connector
diagrams for DVI :-) The nice thing about standards,
is you can have so many of them.

Paul
  #7  
Old October 18th 18, 12:17 PM posted to alt.comp.hardware
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Posts: 13
Default Connection Monitor to PC ???

On Thu, 18 Oct 2018 11:04:05 +0100 (BST), "rp"
wrote:

On Thu, 18 Oct 2018 05:26:21 -0400, wrote:

Of course none of this would have happened if my 5 year old my
MINIVIEW SYMPATH 4-VGA-PC monitor-mouse-keyboard-connector no longer
seems to handle the VGA cables I have been using. Strange.
The cable ends now won't fit on the connector. All 4 of 'em. Looks
like someone sat on them but I know noone did. All was okay until I
dismantled and moved all my computer stuff to another room Then I cud
not re-assemble things. I don't understand why things are the way
they are. And then the fact that I cud not connect 2 monitors really
threw me. Life can be strange.


Have you got the connectors upside down? They only go in one way up.


Agreed.

What gets me is that my MINIVIEW SYMPATH 4-VGA-PC
monitor-mouse-keyboard-connector worked for 4/5 years, and gave me
trouble only when I dismantled everything to move. When I went to
re-assemble everything I quickly found that I could no longer connect
the VGA cables to the 'box'. The cables are/were nice beause they
contain connections for mouse and keyboard which means in my case one
keyboard, one mouse, one monitor for up to 4 PCs selected by choice.
Now I can't connect the same cables. I am flabbergasted! Go figure.
I'm gonna hafta try them again! I am missing something.
J
  #8  
Old October 18th 18, 02:30 PM posted to alt.comp.hardware
[email protected]
external usenet poster
 
Posts: 64
Default Connection Monitor to PC ???

On Thu, 18 Oct 2018 07:17:23 -0400, wrote:

On Thu, 18 Oct 2018 11:04:05 +0100 (BST), "rp"
wrote:

On Thu, 18 Oct 2018 05:26:21 -0400,
wrote:

Of course none of this would have happened if my 5 year old my
MINIVIEW SYMPATH 4-VGA-PC monitor-mouse-keyboard-connector no longer
seems to handle the VGA cables I have been using. Strange.
The cable ends now won't fit on the connector. All 4 of 'em. Looks
like someone sat on them but I know noone did. All was okay until I
dismantled and moved all my computer stuff to another room Then I cud
not re-assemble things. I don't understand why things are the way
they are. And then the fact that I cud not connect 2 monitors really
threw me. Life can be strange.


Have you got the connectors upside down? They only go in one way up.


Agreed.

What gets me is that my MINIVIEW SYMPATH 4-VGA-PC
monitor-mouse-keyboard-connector worked for 4/5 years, and gave me
trouble only when I dismantled everything to move. When I went to
re-assemble everything I quickly found that I could no longer connect
the VGA cables to the 'box'. The cables are/were nice beause they
contain connections for mouse and keyboard which means in my case one
keyboard, one mouse, one monitor for up to 4 PCs selected by choice.
Now I can't connect the same cables. I am flabbergasted! Go figure.
I'm gonna hafta try them again! I am missing something.
J



I am on my second machine now - hence the different signature, Anyway
I have tried using the connector again and forced the VGA cnnectors
and I have one PC working (this one). but , try as I may, I just
cannot connect the second macihine. So. I am stuck.
J
 




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