Shorted rectifier diodes [Rectifier stalk], shorted ceramic capacitors connected in parallel with rectifier diodes, and the DC power supply etc: can be the cause. Shorted junction with the switching regulator transistor, is the most common cause. The causes can be many. But, pinpoint the exact faulty component is the success for any repair work.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
let me get more specific if site doesnt freeze up on me
my first time working on a tv so knowledge limited but now know some basics. i replaced all five caps on this completly dead tvs psb board.BUT
had trouble finding them locally so all mismatched with two 25 volt 105c (same as bad ones) and one 35volt 105c ( this is what i wanted all five to be)
could not find anymore hi temp (105c) so replaced other two with 50 volt 85c. all five 2200 microfaret. been researching two weeks and didnt want to wait to order being so close
when i plugged it in it came on with front lights right away but no pic and wasnt responding remote or buttons on tv so waited few minutes and noticed no red standby light
so unplugged and hooked up sattelitte to have sound. plugged back in and didnt power up
so unplugged and hooked up sattelitte to have sound. plugged back in and didnt power up. pressed power on remote and came on with flashing green light and went off waited 30 sec and no pic. sound and cycled like i think it should and had lights on inside tv.
waited some to if cycle again like others do i read about but didnt. i noticed it was in standby mode with solid red light
pressed power again and it lit up around power buttn while making what i say is game sound with the flashing green light and sound frm sattelite signal and green light went off and probly a minute later that awesome pic appeard i had been missing almost 2 weeks.
it has worked great taking two trys for 36 hours now and when green flashing lite goes out during startup only taking 15-30 seconds for picture to come on.
i will except taking twice to power up without problem. but im actually pressing the power button again on 2nd try after red light appears indicating standby mode. i think when it first started well i know when it first started having problems it cyc led and came on idk exactly how many attempts but up close to an hour before i had to start unplugging and enventually dying with no lights or sound. Nothing. so im really concerned about the two 85c caps and other two 25 volt 105c caps cause i wanted all to be like the one 2200 35 volt 105c caps and wonder if any of them or wat else would make it take two trys when all else powers up like it should with no pic on first try. even lights are on inside tv on first try. now ive only shut it off now a handful of times longest being 3 hours or so. it only came on right the first try when i accidently hit button on surge protector and then i powered right back up when i noticed red standby light.
also want to shut it off for around 8 hours cause it seemed like when problems first started the longer it was off the worse it got especially towards the end when it died. any advice would be very helpful especially which parts to look at and even not to worry about. ive watched videos on changing all kinds of boards and other parts but only dmd, main, the tube that has the 3 radiator type parts in enclosed tube for i think the three colors with the red having problem being furthest from fan and collecting most dust. also seems as if this is hottest part in tv and blows almost directly on the psb and caps. i left the one little small dust/acess cover off to allow heat to escape better. ill clean often if have to cause just seems as if it has to help.
sry for all the short post but every now and again this site runs slow causing it to lock up then losing whatever i did manage to type. its good now though as u can see difference
after rereading i meant to add but only watched videos on dmd,main and that tube being change on my exact model.at first had lots of confusion on similar models but had color wheels and lamps with some kind of door that gets stuck. im pretty sure mine doesnt have this. not sure on lamp but looks like digital mirrors, led lite engine and those three color coolers in tube. idk if i just want to believe or wat but the darker reds seem so much more enhanced since i cleaned all of those inside tube and left that access/dust cover off. i say this cause i notice the green and blues enhanced before like the red now. we all have opinions i know but i believe this dlp has better picture than plazmas and other led and lcd tvs ive watched. this being only dlp ive ever watched. the main reason for wanting to fix it and even better if it stays fixed for only $21.
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