my SHARP LC-40LE810UN has issue help needed to find and fix.

[Davi.p]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

If you're happy to experiment then you can simply shortcircuit the secondary side of the optocoupler and keep the tv in test, if it works flawlessly then you found the bad component.

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

thanks for suggestion, i thought earlier for that but wasn't sure about ,
tomorrow i will get parts and will check. thanks again

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

sorry for delayed response,
badly stuck in job, as well i am in canada so very backword country
PC123 optocoupler not available , so order online its $2 part but no choice ...
once i fix i will update ..seems bit be bit delay !!

[Davi.p]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

EL817 is the same...

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

Thank you Davi , help apriciated,

[johannesstroh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

As mentioned here instead of replacing the opto u can simply solder a 47k resistor in parallel to R7019, which is in series to the opto on the primary side and get the opto working again

[Davi.p]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

But you can find an optoisolator in every modern power supply like old lcd monitors that you can find on the dumpster...

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

As mentioned here instead of replacing the opto u can simply solder a 47k resistor in parallel to R7019, which is in series to the opto on the primary side and get the opto working again

Thank you for option, apriciated
i received optocoupler last night , PC123 by sharp
in 2 days i will replace and check .
hope for best , thanks again .

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

But you can find an optoisolator in every modern power supply like old lcd monitors that you can find on the dumpster...

yes Davi,
you are right , previously i throw so many , but when you exactly need that time you don't have, in North america is consumer idology ,to find PCB part or fix/repair PCB is like fixing setellite , 99% people says throw TV or best case buy used PSU board ebay , only 3% case some shops or hobbiest like me try and learn before spent money on new TV . here they convience people to throw stuff and buy as well push them to forget to read or self learning skill top of that get access to parts harder and harder etc and make them zombie asap.

thanks again.

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

stuck with unfortunate issue,
the New part i got seems to be bad,
i chage optocouplar , and tv doesen't start at all
than i put back older one and tv start right away, it tend to believe me that that new part may bad, now quick option is only left to use 47K resister. will be update soon , thanks

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

As mentioned here instead of replacing the opto u can simply solder a 47k resistor in parallel to R7019, which is in series to the opto on the primary side and get the opto working again

stuck with unfortunate issue,
the New part i got seems to be bad,
i chage optocouplar , and tv doesen't start at all
than i put back older one and tv start right away, it tend to believe me that that new part may bad, now quick option is only left to use 47K resister
will be update soon .

BTW my PSU board i can locate R7020 not R7019 ...so need to confirm before i solder resistor !! pic attached !!

thanks in advance. help apriciated

[Davi.p]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

how do you have mounted the optocoupler?? it has a mark point that identifies pin 1,
this must be connected to the HOT (primary) side!

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

how do you have mounted the optocoupler?? it has a mark point that identifies pin 1,
this must be connected to the HOT (primary) side!

Thank you Davi for precautionary alert !! apriciated
yes , previously i solder some IC so i know there dot to count pin 1
although i always take pic. before i unmount older one, i didn't do any mistake on this one too, but seems its just bad piece like my bad luck
but not big deal i already order another , may be 3-5 days i have it .

thanks

[Davi.p]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

I say this for you, read again my post #21.... (!)

[budwich]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

sorry for delayed response,
badly stuck in job, as well i am in canada so very backword country
PC123 optocoupler not available , so order online its $2 part but no choice ...
once i fix i will update ..seems bit be bit delay !!

that's quite funny... :-) and here I thought up here in ottawa that we were in the backwaters of canada / ontario and that toronto was the center of the universe. Even finding simple parts is difficult.... now I don't feel so bad having to order elsewhere beyond the "border".

Hope you are successful... and save another set from the dump.

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

If you're happy to experiment then you can simply shortcircuit the secondary side of the optocoupler and keep the tv in test, if it works flawlessly then you found the bad component.

you mean direct jumper (short) on secondory between Emitter and Collector ??

[Davi.p]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

Of course.

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

Of course.

thanks , tonight or tomorrow morning i will
if it works fine , is it ok to leave shorted for few hours till 2-3 days ?? till i get new parts !!
just for curiosity what could serious damage to keep running with jumperd secondory side ??

thanks

[Davi.p]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

You don't have to worry about because the function it's used only when mains disappear, but even if it will do, no serious damage will happen.

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

thanks