Question about Samtron 76df 17" CRT Monitor

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Color problem my 15" samtron was working fine until few days ago but now it has turned a bit greenish(i suppose). the red color appears somewhat black,dark green turns yellow. could you sort it out.

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  • Daniel Sweetlin
    Daniel Sweetlin May 11, 2010

    There are three Cathod Ray guns responsible for the millions of colors.All colors are produced by mixing the three basic colors namely Red Green and Blue (RGB) at suitable proportion. If any one of the three guns fail firing then we get improper colors. This can be rectified by

    (1) hitting the monitor at the back by keeping it on a pillow the screen facing down - it will reolve the problem if the failure is due to the loosening of the Head due to repeated thermal expansion and contaction.

    (2) check the signal cable for loose connection, twisting etc on both ends - at the back of the CPU and Monitor (it is fixed)

    TRY YOUR LUCK



    profsweetlin



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There are three Cathod Ray guns responsible for the millions of colors.All colors are produced by mixing the three basic colors namely Red Green and Blue (RGB) at suitable proportion. If any one of the three guns fail firing then we get improper colors. This can be rectified by
(1) hitting the monitor at the back by keeping it on a pillow the screen facing down - it will reolve the problem if the failure is due to the loosening of the Head due to repeated thermal expansion and contaction.
(2) check the signal cable for loose connection, twisting etc on both ends - at the back of the CPU and Monitor (it is fixed)
TRY YOUR LUCK

ProfSweetlin
danielswweetlin@gmail.com

Posted on Sep 19, 2008

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Hi,
You have to check for dry soldering in the base board of you mointor. The base board is on which is attached to the picture tube neck. In most cases there will be dry soldering in the pins of cathode diver ic in that base board. It will be difficult find out which pin have the dry soldering. Do on thing resolder all the pins of that ic. This ic cotrols the three cathodes of picture tube (red, blue, and geen) is any one did not get the correct drive that color will fail to display. In your case the red cathode is not getting the drive voltage. Thats why it shows only gree and blue. This is a reular complait for crt monitors.
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Picture is rolling


Pinout : Pin Name Direction Color Description
1 RED OUT Red Video (75 ohm, 0.7 V p-p)
2 GREEN OUT Green Video (75 ohm, 0.7 V p-p)
3 BLUE OUT Blue Video (75 ohm, 0.7 V p-p)
4 ID2 IN Monitor ID Bit 2
5 Gnd Ground
6 RGND Red Ground
7 GGND Green Ground
8 BGND Blue Ground
9 KEY Key (No pin)
10 SGND Sync Ground
11 ID0 IN Monitor ID Bit 0 GND=Color; NC=MonoMonitor ID Bit 0
12 ID1 or SDA IN Monitor ID Bit 1 NC=Color; GND=Mono Some systems only uses ID0 for monitor ID
13 HSYNC or CSYNC OUT Horizontal Sync (or Composite Sync)
14 VSYNC OUT Vertical Sync
15 ID3 or SCL IN Monitor ID Bit 3

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assuming that u r a professional..
i guess there is no problem with ur monitor, it sounds like itz due to graphic adapter..either the adapter on ur system main/mother board/agp/pci/pcie is damaged or itz simply 'driver corruption'..
don't panic..check for driver update/download n reinstall graphic/display driver..
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always better to contact system admin/vendor....

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