Sharp aquos lc-60le741e

[sordids999]

Hello

got this tv today picture is perfect then once the tv warms up after 10 minutes you have a loud and i mean loud screeching noise which im thinking is the speakers and the pictures will then go off

has anyone come across this fault before ?

uploading pictures as we speak

thanks

[sordids999]

Re: Sharp aquos lc-60le741e

pictures

[dick_barton]

Re: Sharp aquos lc-60le741e

Can you monitor the audio supply and see if that is dropping possibly due to a fault either in the audio circuit or power supply itself.

[sordids999]

Re: Sharp aquos lc-60le741e

testing voltages now

[sordids999]

Re: Sharp aquos lc-60le741e

Does anyone have a schematic for this power supply i cant seem to find anything RUNTKA935WJQZ DPS-171CP A

update: its definitely the speakers thats making the loud noise sometimes it does that or just the backlights that switch off voltages on backlights start at 100 volts then drops to 62 volts but steady

[sordids999]

Re: Sharp aquos lc-60le741e

update:
fingers crossed

reflowed the BGA and tv has been working over an hour now

[dick_barton]

Re: Sharp aquos lc-60le741e

Hope the reflow is successful.

[sordids999]

Re: Sharp aquos lc-60le741e

I've got to be honest that's 6 I have done now and all still working mainly LG TVS
This is my first sharp though that's why I said fingers crossed