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LG RD-JT92 PROJECTOR. Will not start up and all buttons flashing.

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  • lgpaskana May 16, 2008

    I have the same problem, projector worked fine yesterday but now the lights (every each one on the projector) are just blinking.

  • mikedewaal Jun 20, 2008

    Ive had the projector checked out and have been advised that it is a power supply problem. approx $500AU to repair. Now own a new projector. Im gonna strip it and check out aftermarket power supplies....See if there is a cheap alternative.

  • steve975 Jul 08, 2008

    yes exacly the same problem woked fine one day not the next.

  • cherby21 Jul 14, 2008

    Yep, same.

    Beautiful one day, kaput the next.

    Unit is approx 5yrs old.

  • cliff653 Aug 04, 2008

    Absolutely same thing here! The projector ran for less than 50 hours alltogether. :-(


  • pirogen Aug 19, 2008

    I have the same problem. All lights on the control panel are blinking. No response from control panel or remote. The projector is about 3 years old / 1000 hours of operation.

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Capacitator on the Power Unit - exchange it and you'll be fine...
http://www.cliff.de/galerie/RD-JT92-inside.jpg

Cheers,

Cliff

Posted on Apr 07, 2009

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I have the same problem and according to as LG service technician it is a very common and simple problem, only a component that needs to be replaced (a condensor). According to LG it takes 5 minutes to fix but they can not supply the schematics. If anyone has the schematics, please mail it to sverker_n@hotmail.com and I will upload all details on how to fix it

Posted on Apr 07, 2009

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Posted on Jan 02, 2017

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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

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