Question about Sony VPH-G90U Remanufactured CRT Graphics Projector (VPH G90U, VPHG90U, VPH-G90, VPH G90, VPHG90) Multimedia Projector

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Red gun is shimmering on my sony g90

When you look into the red gun you can see a shimmer or fuzzynes going on and the image on a test pattern looks like its slightly out of focus , but when you put a signal onto it either composite or rgb the red goes way out of focus and the shimmering goes crazy like the signal path is going across high voltage of some sort thanks for any help.

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6 Suggested Answers

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Posted on Jan 02, 2017

  • 3130 Answers

SOURCE: Picture - Flickers/Shimmers

Definatly has a problem it sounds like my freind. Could be a problem with the abl circuit, the picture tube or a voltage regulation problem. Good Luck PS Please dont forget to rate this thread.

Posted on Oct 23, 2006

  • 934 Answers

SOURCE: Philips 42" Plasma

It's likely the upper Y-module but both the upper and lower could be having problems - just nothing noticeable in the lower half of the screen as yet, is my guess..
This is not a job for a layman and you'll need some fairly sophisticated equipment to troubleshoot the boards, not to mention being able to read schematics and understand waveforms. Hence, my best advice would be to take it in to a reputable shop and have it estimated...
If you need some help locating a shop near you try the NESDA locator -

Posted on Nov 11, 2007

SOURCE: Faint red lines in a curved arch like pattern

To access the focus block with the screen controls, remove the 2 plugs under the speaker grille. There is a philips head screw under each plug. Remove both screws. the speaker grill is now free. Pull the bottom forward and the grille will come off. The top is just held by tabs behind the screen bezel. Be careful as there is wiring to the grille for video input 2 and the front panel controls. There is a piece of fiberboard held on by 4 screws in the center which was formerly covered by the grille. Remove the screws and the panel and the focus block is right there. Each color is labeled for both screen level and focus. Adjust the screen control of the color producing the lines until the lines just disappear.

Posted on Mar 31, 2008

  • 109 Answers

SOURCE: Samsung Model: HP-R4262 42" Plasma Problem, pink pixelation/ghosting

Wow, I've been an installer and salesman in the consumer electronics industry since before the first plasma TV came out (Phillips 42" and Fujitsu 42" in 1996) and this is the first time I've ever seen that kind of an answer. "Take this to a repairman and he can add more plasma" what is the repairman a doctor. If it were that easy no one would ever have to upgrade or replace their screens. You can't add more plasma to a screen, if you don't believe me call Samsung and ask them for yourself like I did. I was actually so dumbfounded by your answer that I called a tech friend of mine at Samsung and asked him, his answer; "does this guy work for you?" I told him no and he said, "I was going to tell you to fire him because that's the dumbest thing I've ever heard anyone tell a customer".
What you need to do is take you plasma TV to an AUTHORIZED Samsung dealer/repair shop and inquire about the hazing/ghosting problem with them. Follow this link to find an authorized repair center near you:

Posted on Jun 19, 2008

  • 876 Answers

SOURCE: sony triinitron tv out of focus

Please go to this site for an answer:

This is information specifically for your television.

Good Luck to You!

Posted on Aug 16, 2008

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Tv has a pink/magenta shimmering when the tv screen has a light coloured backgroung

Shimmering can be caused by a number of things.

The first that springs to mind is electromagnetic interference. Speakers, amplifiers, florescent lights in close proximity can cause this. I even saw a TV that had been fixed to a wall adjoining the next door neighbours who had put his TV in exactly the same position and the interference passed through the wall.
Try moving the TV location away from all sources of interference (including Cable boxes, Video recorders, etc.) Does the problem change or go away?
Is the TV grounded properly? Interference needs to be siphoned off to a ground. if you put your hand around the cable that feeds the TV a video signal does the problem change or reduce?

Another issue may be some form of video post-processing going on causing the shimmering. Some forms of image smoothing software built into the TV can cause this. So try shutting down any features on the TV, does the problem go away?

On a big TV that is fed a low resolution video stream you will always see what the industry calls "artefacts". These are distortions caused by the transport compression of the video signal. there is no way around these except for receiving a better resolution picture stream.

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Picture - Flickers/Shimmers

I think the solution to your problem is adjustment, not of the brightness but either the `contrast' which is probably too high, or the `sharpening' if your set has this function. Too much sharpness will cause a shimmering effect, especially where you see an edge between colours.(due to ringing at a very high video frequency). Too much contrast can start to turn the video signal upside down, causing noise on the peak white in the picture. Another cause is if the RF signal into the aerial socket is too large, This can be corrected by an attenuator, costing about £2. 6dB or 10dB can be tried.

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