I used a LG DLP projector RD-JT91, recently the power supply unit was affected by surge voltage. i have fixed the power but my problem now is that when you power up the system after displaying the welcome sreen the LAMP goes off. Is it that the LAMP need replacement or what exactly is wrong .
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Looks like there is power supply problem as well as the lamp.
1 Clean all filters 2 Check out power supply (usually a few capasitors need to be replaced) 3 Wuld be a good idea to check the lamp in wokring projector, but if the "Lamp" light is constantly on it is more likely a faulty lamp as well.
A weakness that you might experience with your projector is the collapsing of the light or mirror tunnel. Not sure if this is common to DLP projectors only. The symptom is that you see grey bands or shadows on the edge of the TV image - this is caused by a mirror getting in the way of the bulb light. The glue holding the mirrors together seems to weaken over time (3000 lamp hours in my case) and causes one or more of the mirrors to loose its position. For solution, search for "mirror tunnel" or "light tunnel" under all projectors. The problem seems to be quite widespread. I managed to fix my LG's.
I wonder why the manufacturers don't use a rectangular glass tube that is mirror plated on the long sides ?!?! Suppose they want to sell new projectors after lamp or mirror tunnel expiry!
There is basically two ways to reset the lamp timer :
1. ) On the Projector's physical buttons
Arrow Keys - Up , Down , Left , Right then Menu and Enter - this should be done quickly whilst the Projector is in standby mode.
2.) Switch Projector on - Hold in the Up Arrow Key on the physical buttons on the Projector untill a PIP screen appears - then just follow the on screen steps.
On the left hand side where all the inputs are located you will see a very small screw , that is most probably what's keeping you from opening it.
Also remember to take off the cover to the front and do this slowly because the translation board's lint is attached to the top cover. Once open you can just unhook it and then you'll be looking for the board with the AC inlet on it.
1-press the exit button on the projector for 3 second to display the total used lamp time.2-press menu button on the projector during the lamp hour message- an adjustement message will be appear press right or left arrow to reset timer to zero.if success osd change to(lamp hour reset ok!)
In PSU, on the secondary side of switch supply there are electrolytic capacitors: for 13 V is 470uF/25V and for 5 (and subsequent 3V) is 1000 uF/16V. Those capacitors in some devices from this series use to break (why? I don't know: maybe cheep quality). Check voltage on rectifiers outputs with oscilloscope: if there are not constant voltage on one of them you should replace it with the new one (of course good quality). I've got the same failure subsequently on 5V supply (this reparation was done by LG service, but when I asked them they answered they replaced mother board - bull shit!) When the same "flashing" problem after guaranty occurred again, I had found soldering traces on the cap on 5V!And guess what - it was cap with a different brand than others.
This solution is maybe only for el-geckos, but no service wanted to repair my quite new, still worth something projector (not in Sweden any way). If you can’t do a job your self you still can ask some handy friend which know how to solder parts. Be careful! There is high, dangerous voltage on primary, so you must know what you are doing!
I'm sometime very irritated: that capacitor cost less in bulk than 2 cents each!But the ordinary people must buy a new projector because of lack of service!