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My Sagem DLP HTD 501, recently came up with a warning light error,too replace the lamp,and subsequently blew.I replaced the lamp,but still have the same problem,with the screen dead and the warning light still on .Any suggestions.......Steve

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Ok...this is only a theory. Did u replace bulb..or lamp unit?
To cut along story short the tv has a timing device in it set to about 8000 hours. When u look at a picture (google) of the new replacement lamp unit, there is an additional circuit board on the housing, this aligns to two tiny contacts inside the tv. (you can see it when u look inside the socket. its green and about 10mm by 20mm and labeled lamp saftey). this circuit board (on the lamp unit) is absent on the one that comes with a new htd501. I believe the replacement lamp housings circuit board is a 500Ma fuse, which momentarily sends a current to reset the timing device then immediately blows, leaving your timing device reset to 0hrs.
As i say this is only theory based on reading other materials online, however my friend has this problem and i am waiting for him to give me the go-ahead and try it.
What I will do is make a plasic board with bean tin contacts aligned to the contacts inside the tv, and solder a fuse housing to the home made contacts and use a 500ma fuse. this should reset the timer!!
I cannot guarantee or even recomend this unless u r sure and confident about making the above gadget. however i will return to this page and tell u if i was successful in a week or two.

Posted on Jul 07, 2008

  • pooky72 Jul 07, 2008

    http://www.hifi-forum.de/viewthread-132-..." target="_blank" rel="nofollow" >Translated version ofhttp://www.hifi-forum.de/viewthread-132-...
    It is NOT a fuse (well... maybe a special fuse) but a resistor!
    temporarily put the specified resistor across the contacts i mentioned as per the instructions at the German site above.
    Thats what i am about to do now. Will let u know if i have success.



  • pooky72 Jul 07, 2008

    OK I have done it!!!!!!!
    simply solder a resistor (value 470 Ohms) across the contacts,
    then put the bulb and housing back
    then screw the black front plate on
    switch on tv as normal
    wait for light to turn green
    switch off tv
    timer is now reset
    take all the above apart again!
    remove the resistor
    put it all back together again
    your tv is now fixed!!!!
    let me know how you got on
    Nick_pook@yahoo.co.uk
    ---!!!GOOD LUCK!!!---



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Sagem used two methods to reset the lamp timer.

HTD501 is as described above, with a resistor.

Subsequent models have a fuse mounted in the lamp holder. Whwn the lamp is replaced the fuse should also be replaced. When you first switch on it will blow deliberatrely resetiing the counter

Posted on Jan 17, 2010

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