Sharp LC-52D85U Won't turn on

[birdboy385]

Re: Sharp LC-52D85U Won't turn on

I took indiviual pictures of each Inverter board and the PSU board then a pic of the whole back.

[birdboy385]

Re: Sharp LC-52D85U Won't turn on

hmm something else i noticed. I watched a video on shopjimmy which showcasesan lc-32 with simillar problem. However when he goes through a hardreset, you'll briefly see the menu and channel indicator, I don't get any picture when attempting a hard reset, I'm wondering if there is more to this issue than just a potential backlight problem.

[birdboy385]

Re: Sharp LC-52D85U Won't turn on

any thoughts from anyone? Like i'm actually wondering if there;s an issue with the mainboard not showing video and if there is that issue could that be causing my error code altogether.

[birdboy385]

Re: Sharp LC-52D85U Won't turn on

i feel like there's probably a way to override the diagnostic mode as i mentioned in the other post but not sure how i'd do it since it was technically a different tv

[martino]

Re: Sharp LC-52D85U Won't turn on

I would start by measuring the secondaries on the inverter coils. write them down and compare values between all of them.

[birdboy385]

Re: Sharp LC-52D85U Won't turn on

sorry for the late response. Um my knowledge of measuring this sort of thing is very minimal. forgive my inexperience but no idea what that means lol.

[drkthundr]

Re: Sharp LC-52D85U Won't turn on

Wrong post

[birdboy385]

Re: Sharp LC-52D85U Won't turn on

Ok so this is the video i was referencing

https://www.youtube.com/watch?v=iIfdf0ut4Po

it shows the bridging of a cap to disable the error detection. I was wondering if the same method could be applied to this tv so that It would run "normally" so i could at least properly troubleshoot. With the error detection taking over, I can't get anywhere with it.

[martino]

Re: Sharp LC-52D85U Won't turn on

sorry for the late response. Um my knowledge of measuring this sort of thing is very minimal. forgive my inexperience but no idea what that means lol.

Look at picture,I circled the legs of the coil which you need to check resistance between.
Write down the resistance from all coils,they should be within 10% of each other.

btw,parts are cheap for this tv.:
http://www.shopjimmy.com/catalogsear...harp+LC-52D85U

[birdboy385]

Re: Sharp LC-52D85U Won't turn on

My inverter boards are different than that. not sure where you're actually ahving me check to map to my own board.

[birdboy385]

Re: Sharp LC-52D85U Won't turn on

here's what mine look like

[birdboy385]

Re: Sharp LC-52D85U Won't turn on

Yeah i really don't know how to translate the board you showed with mine.

[dick_barton]

Re: Sharp LC-52D85U Won't turn on

Can you post a picture of the reverse side of the board in post #31

[birdboy385]

Re: Sharp LC-52D85U Won't turn on

Can you post a picture of the reverse side of the board in post #31

both boards are shown in the original post. showing the other angle.

[birdboy385]

Re: Sharp LC-52D85U Won't turn on

anything else you need?

[dick_barton]

Re: Sharp LC-52D85U Won't turn on

Can you measure all your inverter transformers and see that they all match.

[birdboy385]

Re: Sharp LC-52D85U Won't turn on

i'm not getting any reading when measuring those legs. i have my multimeter set to 500v Since i read the reading should be over 1KV IDK if my multimeter just idn't powerful enough to read thjat

[budm]

Re: Sharp LC-52D85U Won't turn on

The picture of the transformer pins are on the BOTTOM view so you have to look at it from top view perspective which will be opposite.
' i have my multimeter set to 500v'
BTW, we are reading resistance not Voltage!
NO POWER to the unit.

[vinceroger69]

Re: Sharp LC-52D85U Won't turn on

i'm not getting any reading when measuring those legs. i have my multimeter set to 500v Since i read the reading should be over 1KV IDK if my multimeter just idn't powerful enough to read thjat

These need to be measured in ohms resitance Not dc volts so leave the tv unplugged and take the readings so we can see if you have any issues.

[birdboy385]

Re: Sharp LC-52D85U Won't turn on

lol i realized as soon as i posted that i'm like...wow i has the dumb today.These are the readings that im getting

800
800
763
768
768
768
770
Can't get a reading from the 8th one
775
765
775
775
So probably safe to say that (i beleive that's the master board that has 12 transformers and the slave has 10) there is one bad transformer on the master. i'm going to read the slave now and report back