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Newsgroups: sci.electronics.repair
From: Franc Zabkar <fzab...@iinternode.on.net>
Date: Wed, 10 Sep 2008 07:33:52 +1000
Local: Tues, Sep 9 2008 3:33 pm
Subject: Re: Bad DLP Ballast?
On Sat, 6 Sep 2008 08:26:52 -0700, "Chris F." <zappy...@hotmail.com>
put finger to keyboard and composed: > Me again with this miserable Zenith DLP TV. I made a post about this about This forum suggests that LG had a bad run with 5kV lamps: >a month ago regarding lamp replacement, I was able to do it successfully and >returned it to the customer. A few weeks later the customer brought it back, >this time with a different symptom; the set tries to power but makes a >buzzing sound, and shuts off. > With the front cover removed, I soon saw the source of the buzzing sound. >A small round white component off the HV transformer (looks something like a >large diode) lights up bright blue appearing to arc internally. The lamp >does not power up at all. I checked the lamp and it is fine, so at this >point I'm suspecting a bad ballast...... but with replacements costing up to >$200, I sure hope it isn't. http://www.avforums.com/forums/archive/index.php/t-415699.html Problems with starting ... >Thanks for any advice. This patent has an explanation of how a typical 2-pin ballast works: http://www.freepatentsonline.com/6781328.html It includes basic circuit diagrams. AFAICT, a capacitor is charged to about 370VDC at which time the - Franc Zabkar You must Sign in before you can post messages.
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