MONITOR-NO GREEN

F

friend

Guest
Hi guys,

My phillips monitor has lost the green. Is this a driver problem. Can I fix
it myself?

Many thanks
 
friend(someone2@hotmail.com) spoke, er, wrote:
Hi guys,

My phillips monitor has lost the green. Is this a driver problem. Can I fix
it myself?
Click to expand...
What model? If you're not skilled on electronics and aware of the dangerous
voltages inside your monitor - which can be deadly, better leave it to a tech.

"That monitor won't be too useful if you're dead." - modifying from
www.repairfaq.org section on safety.


--
Chaos MasterŽ - From Porto Alegre - Brazil.
Please ask for e-mail address, or even better, REPLY TO THE GROUP.
erana.ovepx@ibestvip.com.brazil - Do ROT13 to the text before the @ and replace
..brazil with .br
 
The must common faults of missing colors are:
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.
The first 3 pins on the top row are the RGB video lines. Try measuring
the resistance of each line to ground. Good lines will be about 75 ohm.
If you measure a large resistance, the video cable line is broken.
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.
I would download a standard color bar program from the web to determine
which color is actually missing. There are also pinouts on the web that
indicate which pins do what functions on the picture tube socket.
Hope this helps...
John
 
In addition to the suggestions below, check the 3 screen grid / drive pots
(one for each color) either on the main circuit board or on the smaller
board plugged into the neck of the picture tube. You may have a bad solder
connection or simply a dirty pot. Sometimes just moving it back and forth
slightly (use a small PLASTIC screw driver) will bring the signal back.
-Ron
(email: replace 'abuse' with 'cyberguy3k')


"Friend" wrote:
Hi guys,

My phillips monitor has lost the green. Is this a driver problem. Can I
fix
it myself?

Many thanks

"John Gill" <jdgill@juno.com> replied:
The must common faults of missing colors are:
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.
The first 3 pins on the top row are the RGB video lines. Try measuring
the resistance of each line to ground. Good lines will be about 75
ohm.
If you measure a large resistance, the video cable line is broken.
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.
I would download a standard color bar program from the web to determine
which color is actually missing. There are also pinouts on the web that
indicate which pins do what functions on the picture tube socket.
Hope this helps...
John
Click to expand...
 
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