Question about Panasonic PT-AE900U Multimedia Projector
I have vertical even spaced lines across the whole screen. i went into the service menu to check the colors in flicker adjust on the blue and the red screens there are no lines but on the green screen the lines are there any suggestions?
If you are handy with SMT rework it might be possible to fix this problem. The heat spreaders on the LCD drivers are insufficient to cool the chips and they will get hot enough to reflow the solder and cause a short on some of the pins. I think it most often happens after bulb replacement since bulbs near their end of life are dimmed and run cooler. After replacing the bulb the bit of extra heat is all that is needed to push them over the edge.
The problem also seems to be most prevalent on the green IC since it shares a heatsink with red and has a smaller area to dissapate the heat into.
If you pull the heatsink you will probably be able to see the short with careful inspection. The pitch is very small - 0.6mm but I was able to wick, clean, and reflow one side of my green IC and the problem went away.
I am planning on adding some additional aluminum stock to the heat spreaders with some thermal adhesive to give the chips more cooling.
By the way the very common rattle noise in these projectors is not a fan but the auto iris. You can unplug the iris servo from the mainboard and disable the auto iris in the menu to work around the problem or you can replace the iris servo for about $75, again, if you are handy with that sort of thing.
Posted on Dec 30, 2008
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