hi,have the same problem on my board.
replaced the capacitors and I got the same buzzing sound.
have you found out what is the problem ?
exmortis
Member
Last Activity: 03-01-2013, 03:27 PM
Joined: 02-22-2013
Location: essex
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Re: technika 42 lcd 910 power probs
these mosfets are probably my fault they have gone faulty , i accidently shorted one of the big caps when taking 24v reading on the invertor board , so i suppose the rapid discharge from the cap damaged them , hence me fault on the T.v changing ..oops
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Re: technika 42 lcd 910 power probs
i dont think so...Leave a comment:
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Re: technika 42 lcd 910 power probs
anyone got 4x FDD8447l mosfets they can send us in the post, cant get any at the mo
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Re: technika 42 lcd 910 power probs
yeah i think the 4 mosfets on the invertor next to the 2 caps are knackered i have to get some and change them and see what happens...Leave a comment:
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Re: technika 42 lcd 910 power probs
ok i been testing and checking components , i found a 4.7Mohm resister open circult which i replaced has resolved the buzzing issues from power supply, still remains in standby, i just been testing Mosfets on invertor and found n channel bottom 4 are at fault model fdd8447l 40v , iam right in saying they operate similar to diodes back to back and only allow current one way through ?...Leave a comment:
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Re: technika 42 lcd 910 power probs
what next thing i can test once the caps are sorted ?...Leave a comment:
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Re: Technika LCD42-910 Stuck in standby
i changed some caps on the psu, now the fault has changed the LCD is complete stuck in standby clicks on then off with a couple of secs and the psu still buzzing from the relay unit which clicks over nightmare ....Leave a comment:
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Re: technika 42 lcd 910 power probs
would increasing the microfarad on the replacements cause a issue i.e going from 470 to 1500 same voltage tho ?Leave a comment:
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Re: technika 42 lcd 910 power probs
they are MCZ are the series anygood...Leave a comment:
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Re: technika 42 lcd 910 power probs
what about Rubycon capacitors ?...Leave a comment:
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Re: technika 42 lcd 910 power probs
ok if i sort them what would be the next step to test ? iam stuck now on what to check....Leave a comment:
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Re: technika 42 lcd 910 power probs
they where capcon ones same as removed , tv does the same , and i checked the 24v to the invertor and they do get a feed briefly then the tv clicks back off and the voltage drops off....Leave a comment:
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Re: technika 42 lcd 910 power probs
ok i have some others now good ones i try them instead now and keep ya posted many thanks...Leave a comment:
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Re: technika 42 lcd 910 power probs
yeah i get 24v the it drops off and the cap's have no brand just some i picked up at the local electronics shop to match the ones to replace , 470micro 16v
but the behaviour of the fault has now changed...Leave a comment:
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Re: technika 42 lcd 910 power probs
or completely stuck in standby mode help...
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Re: technika 42 lcd 910 power probs
i replaced the caps in red on the pic, now she switches on then off ....Leave a comment:
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Re: technika 42 lcd 910 power probs
blue button stays on now solid on the front ....Leave a comment:
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Re: technika 42 lcd 910 power probs
i double check the led on the front tho now...Leave a comment:
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Re: technika 42 lcd 910 power probs
power led does not blink at all, i changed some of the caps on the isolated side of the psu, same as the other chap did, and now it switches on and then back off within a couple of seconds...Leave a comment:
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