Hello, i have a Dell E770s with an intermittent green gun. The problem
is in the monitor itself because the built-in testpattern shows no
green, just red, blue and black where green is suppsed to be. I have
resoldered almost everything leading to the green gun and has not
improved the condition. The problem is usually when its cold, but i
have seen it stay that way for hours before it returned to normal. Any
suggestions on what to replace or check? Could the driver be
intermittent or does it usually just "go"? Thanks in advance.

What you should do, is monitor the video signal going in to the green gun at
the CRT base, and see if it the problem is there. If you have signal, and
the DC is correct, then it is the CRT, not the circuitry behind it.

If the signal or DC is changing, then trace back to find where the change is
originating. It is also possible to have a semi or some other part that has
become internally intermittent. It may not necessarily be a cold solder
connection.

--

Greetings,

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


"WATTAGE" wrote in message
m...
Hello, i have a Dell E770s with an intermittent green gun. The problem
is in the monitor itself because the built-in testpattern shows no
green, just red, blue and black where green is suppsed to be. I have
resoldered almost everything leading to the green gun and has not
improved the condition. The problem is usually when its cold, but i
have seen it stay that way for hours before it returned to normal. Any
suggestions on what to replace or check? Could the driver be
intermittent or does it usually just "go"? Thanks in advance.

What you should do, is monitor the video signal going in to the green gun at
the CRT base, and see if it the problem is there. If you have signal, and
the DC is correct, then it is the CRT, not the circuitry behind it.

If the signal or DC is changing, then trace back to find where the change is
originating. It is also possible to have a semi or some other part that has
become internally intermittent. It may not necessarily be a cold solder
connection.

--

Greetings,

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


"WATTAGE" wrote in message
m...
Hello, i have a Dell E770s with an intermittent green gun. The problem
is in the monitor itself because the built-in testpattern shows no
green, just red, blue and black where green is suppsed to be. I have
resoldered almost everything leading to the green gun and has not
improved the condition. The problem is usually when its cold, but i
have seen it stay that way for hours before it returned to normal. Any
suggestions on what to replace or check? Could the driver be
intermittent or does it usually just "go"? Thanks in advance.

The must common faults of a missing color a
1. A break in the color video signal wire within the video cable.
This usually occurs near the end that connects to the computer.
Try bending the cable and see if the color comes back.
You can purchase new 15 pin ends at Radio Shack and solder a new
end on the cable.
2. A bad solder connection at the socket where the CRT circuit board
plugs onto the back of the picture tube. Just resolder the connections.
3. A bad video driver transistor or driver IC that supplies the color
signals to the picture tube. Measure the voltages on the three color
signal connections on the picture tube socket. The missing one will
usually be very different.
Hope this helps...
John

The must common faults of a missing color a
1. A break in the color video signal wire within the video cable.
This usually occurs near the end that connects to the computer.
Try bending the cable and see if the color comes back.
You can purchase new 15 pin ends at Radio Shack and solder a new
end on the cable.
2. A bad solder connection at the socket where the CRT circuit board
plugs onto the back of the picture tube. Just resolder the connections.
3. A bad video driver transistor or driver IC that supplies the color
signals to the picture tube. Measure the voltages on the three color
signal connections on the picture tube socket. The missing one will
usually be very different.
Hope this helps...
John