Question about LG RD-JT91 Multimedia Projector

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LG RD-JT91 PSU problem

Thanks for a detailed solution to the flashing lights problem. How do you open the unit to get to the PSU? I unscrewed all the screws marked with an arrow, but still cannot open it. I don't want to force anything.

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  • cliff653 Aug 04, 2008

    Hi, I have the exact same problem with my RD-JT92. Unfortunately it only ran for less than 50 hours (warranty time is over though). I would be greatfull for any help/advice.
    Thanks! 

    Cliff

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Hi there

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.

Posted on Apr 16, 2008

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WHY DOES A BLUE LIGHT CONTINUE TO FLASH ON TOP AFTER THE SCREEN HAS WENT OUT AND WANT COME BACK ON DOES THIS MEAN THE BULB NEEDS TO BE REPLACED


how many times does it flash? could be lamp, fans or overheating. clean it out with canned air. if the lamp has bulges, black spots, or fogging, replace the lamp.

Dec 08, 2009 | LG RD-JT91 Multimedia Projector

Tip

Projectors that are not cheap POSs don't use glue to hold the mirrors in...


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!

on Sep 08, 2011 | LG RD-JT91 Multimedia Projector

1 Answer

A vertical white strip appears after few minutes.


Hi fabiano did you ever find a solution the vertical line in your RD-JT91 Multimedia OH projector. I now have the same problem. Gary

Oct 02, 2009 | LG RD-JT91 Multimedia Projector

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LG RD-JT 21


Hi Mike

Press the following buttons quickly - Up , Down , Left , Right , Menu & then Enter - this should reset the timer.

Sep 16, 2008 | LG RD-JT91 Multimedia Projector

1 Answer

Blue LEDs flickering


Hi Altus , yes that is correct.

Which country are you in ? I will try and direct you to a repairer ?

Apr 29, 2008 | LG RD-JT91 Multimedia Projector

1 Answer

RD_JT 91/92 DLT Projector not switching on.


Hi Altus

This a common Mainboard failure on the LG JT91 if all the LED's flickers.

The good news is that it can be repaired. Much cheaper than replacement.

This will however have to be done by a Service Provider.

Apr 29, 2008 | LG RD-JT91 Multimedia Projector

1 Answer

LAMP goes off after few minutes


1-check the counter reading of lamp to see if it is in the right age of lamp or not.if it is in right age the problem still in power unit or in ballast.

Feb 14, 2008 | LG RD-JT91 Multimedia Projector

9 Answers

All lamps are flashing


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!

There is PSU diagram:1af7f4a.jpg

Feb 21, 2007 | LG RD-JT91 Multimedia Projector

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