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Re: rear projection screen 152cm lg going yellow
I am guessing that this is an LCD projection set, Please post the make and model so I can confirm. In the mean time, if it is an LCD, there are 2 possiblities.
1) The lamp may require changing. Sometimes the inner surface deteriorates because of the heat.
2) The "light engine" requires replacement as the heat and light have started to burn the LCD surface. This burning starts to show up as a yellowing usually onm one side first and spreading to the other side.
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Hi, this is a common problem. One thing you want to observe is that the screen works, what's going on is that the screen LCD illumination doesn't work while the screen display is active. LCD's have screen lamps behind the screen, they are often called CCFL, (Cold Cathode Flouroscent Lamps). The inverter board in the monitor supplies High Voltage power to the lampls, so the colored wires should lead you to the lamps. This is the problem causing the screen to dark. You can research the model lamp type for an accurate replacement. Usually there are 4 or 6 lamps in LCD Monitors.
its possible this requires a special solution similar to the one you find cleaning your cd's but a tech will have to apply this for you dont let them tell you it cant be its call clear reson (spell check) this stuff has been around since rear projection tv's and works quick and fast there is a down side with though if you dont know how to apply and wipe off you can ruin your screen it requires a heat source to apply
It is often difficult to diagnose/repair an intermittent problem. It could very well be any of the circuitry and components inside: video interface, CCF Lamp, inverter, power supply. All of which would require that you open the casing and poke around inside and that you be familiar with electronic components & circuitries, soldering and use of a continuity/volt meter.
Doing so would void your warranty (being just a couple of months). Perhaps your best bet would be to seek repair/replacement of the monitor from your dealer/supplier and describe fully the nature and frequency of the incidence. It may be that when they test it will check good.
Should you choose to open it up yourself, post back.