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Good Day, And join the club of bad light engines from HIT,
One the best ways to contact HIT is via the internet; hitachi corp. The light engine is very common problem for this product. Don't ask them to send part to you, work through a local Authorized Service Dealer. Ask them for a concession on the part. They only give concessions 50% of the time. My customers get the part about 98% of the time.(tech at house with estimate). Good Luck, big IRISH.
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If you wish to get some details; check the sites linked here. https://elektrotricks.blogspot.com/ https://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent. Search the site by type in the Brand Name of your set, in its search bar at the right side column, and press enter. See it in Webview with mobile or by desktop. Mobile View has no search box.
Yes, if the spots are round or teardrop it may be burnt picture tubes.
Easy to confirm this by covering lens of tubes one at a time with set on and see which removes the blotches.
What happened in a lot of these sets is the set arcs and burns a black dot dead center in one or all three of the screens of the picture tubes used--fatal case and permanent.
If the splotches are a shawdowy black and look like mold growing between the Lens, its most likely dirt or water spots on the bottom of the large mirror. I cleaned mine and missed a few water spots on the bottom of the large mirror and the splotches (spots) showed on the screen. Other than Dirt, or water spots, There is nothing else that I can think of that would cause this. Unless the Someone has cleaned the screen and it soaked up between the lenes. But it Takes about 30 minutes to disassemnble, give it a good cleaning and put it back together.
This is what we call Stuck pixels and you can do a search on this online in google and there are fixes to this, I cannot provide the link because of the adverse effect it can do to your monitor if its done wrong but it works just seacr stuck pixels. You can also hook this up to your pc using the pc inut and run a program to unstick these pixels running a applet.
Sorry to tell you but you are describing exactly what an LCD looks like when it has been fractured. Does it work with an external monitor? If so you will need to have it repaired. Call the Fujitsu support number (800)-fuj-itsu and they can tell you where a repair center is in your area. The call is free. Have your serial number handy.
Tiny particles of dust on the light engine lens can cause this (and was a service call for me about a month ago), or possibly the expensive light engine.
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