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Sony G400 CRT problem identification ...
Hello,
I am hoping that someone can help me identify the problem(s) with a Sony G400 19" CRT that I recently was given. After connecting and powering on the G400, the display showed these symptoms: 1) The picture was far too bright. Black displays as a light gray. Adjusting the brightness through the onscreen menu makes no difference. 2) Vertical retrace lines are clearly visible (white or very light gray) as a zig zag pattern. From the bottom left of the monitor a line will go diagonally to about an inch above the bottom on the right, then go straight back to the left side, etc. Repeats about twelve times. The retrace lines get closer together as they get to the top of the monitor. 3) There are very bright lines on both edges of the picture. If I reduce the horizontal picture size (by decreasing the horizontal size in the onscreen menu), the bright lines move with the picture. Could these be the horizontal retrace lines ? 4) The display seems a bit fuzzy. Text is hard to read at 1280x1024 on a monitor that should support 1600x1200. This could easily be due to point 1), but I decided to mention it in case it is a important detail. 5) All of the onscreen menu options work, with the exception of the horizontal position slider. Varying that slider does not change the picture in any way. The vertical position slider does work, as do both horizontal and vertical size sliders. 6) Leaving the monitor on for 45 minutes did not improve any of the symptoms. After reading the Monitor repair FAQ ( http://repairfaq.ece.drexel.edu/sam/monfaq.htm ), I think that this is probably a failure of the blanking system (misadjustment, a power supply or connection issue, or a failure of the blanking circuit). However I can't find a mention of anything like 5) in the FAQ (which could be due more to reader error rather than absence of the information), and I think it is probably telling me something important. Has anyone seen these symptoms, either alone or together ? I am fairly certain that 1) to 4) form a group caused by a single defect, but I hope that 1) to 5) can narrow the failed (loose) or misadjusted component a bit more. Can anyone tell me how best to proceed with an attempted repair on this monitor ? In addition, I don't know how long the monitor has been in this state. Is there likely to be permenant damage if the monitor was run this way for an extended period of time ? Thanks very much for any help or suggestions. |
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