Sharp aquos LC-40LE810E

[rievax_60]

Re: Sharp aquos LC-40LE810E

There is a yellow Donate button at the very bottom of this page.

[Nightmare0]

Re: Sharp aquos LC-40LE810E

Ok then. And what about that donate?

[rievax_60]

Re: Sharp aquos LC-40LE810E

But that user fixed it by replacing all optos, didn't he? I am going to keep this tv in my bedroom. I am not.going to profit on this tv with questionable life span.

The flickering problem was caused by the opto further up on the board, the one on its own. Dont worry about it. It may never fault.

[budm]

Re: Sharp aquos LC-40LE810E

That is for tonight folk, on to the next project, cheers.

[rievax_60]

Re: Sharp aquos LC-40LE810E

You should also turn down the Backlights level down as low as possible but still have good pictures in the user setup menu, this will help extending the LEDs' life, they will run cooler.

Good advice. Turn the back light down and also contrast up, but avoiding white crush. This setting combination gives the TV the longest life and better black level.
Actually it was the lower back light setting that showed up the flickering problem on the Sharp TV that I fixed.

[Nightmare0]

Re: Sharp aquos LC-40LE810E

But that user fixed it by replacing all optos, didn't he? I am going to keep this tv in my bedroom. I am not.going to profit on this tv with questionable life span.

[budm]

Re: Sharp aquos LC-40LE810E

You should also turn down the Backlights level down as low as possible but still have good pictures in the user setup menu, this will help extending the LEDs' life, they will run cooler.

[rievax_60]

Re: Sharp aquos LC-40LE810E

Keep in mind the back light flickering fault that can develop that is mentioned in the other thread.

[Nightmare0]

Re: Sharp aquos LC-40LE810E

Thank you very much. Now I will put tv together and test it. Sorry for my mistakes. You managed to help me even my lack of electrician knowledge and not perfect English. This experience made me to learn a lot of interesting stuff. I hope this thread can help someone in future. I can see, there is donate button on the bottom. If I donate, will you get something?
Co-worker said, he also has some broken tv in basement. Maybe I will make another thread to help him. But first I will give you some rest :-) it had to be exhausting to work with me. Thank you again and provide me some information, where can I donate.

[budm]

Re: Sharp aquos LC-40LE810E

1-2: 1,01v
3-4: 0,25v

That is what I expect, the OPTO should be on when AC is normal so the LED inside the Opto is turned on, as you can see the Vf of the LED is 1.01VDC (per spec of the OPTO, the typical Vf is 1.2V), so when the LED inside the OPTO is on the Photo-transistor is also truned on that is why the Vce (pin 3-Emitter and pin 4-Collector) is low, the transistor is in saturated condition (per spec the typical Vsat is 0.1V, MAX IS 0.2).
So when you add that 68K Ohms resistor the LED will have more forward current (If) so the Photo-transistor is turned on more (it has to do with Current Transfer Function (between 50%~600%) of the Opto).
The reason I ask about the VCC Voltage at those two points is to find out if it is too low, and the OPTO may be operating at marginal point already so it does not take much for it not to be fully on.
The output of the OPTO is used to drive the switched transistor Q7061, IC7061 that control PD-PIN 9 (AC-DET) to make it HI or LO depends on the AC Voltage level.
So you can leave it like that with that added resistor.

[Nightmare0]

Re: Sharp aquos LC-40LE810E

1-2: 1,01v
3-4: 0,25v

[budm]

Re: Sharp aquos LC-40LE810E

Budm, you are right. It worked only once.
So again sorry for your time while I soldered resistor to.wrong place. That's what you will get when you solder at 6 am.
So now...... Again, one more time .
This time I soldered 68k resistor on right place.... Put everything back. Tv is working. Now it's time for measuring. Tell me what do you want to measure. Is this resistor final fix? Or should I buy something?

So what DCV measured between pin 3 and pin 4 now (do not use GN for ref point)? You still should have about 1VDC between pin 1 and pin 2.

[Nightmare0]

Re: Sharp aquos LC-40LE810E

Photos of 68k resistor fix
Also found out, that that red led (D3301) on mainboard is still flashing while tv is on.

[Nightmare0]

Re: Sharp aquos LC-40LE810E

Budm, you are right. It worked only once.
So again sorry for your time while I soldered resistor to.wrong place. That's what you will get when you solder at 6 am.
So now...... Again, one more time .
This time I soldered 68k resistor on right place.... Put everything back. Tv is working. Now it's time for measuring. Tell me what do you want to measure. Is this resistor final fix? Or should I buy something?

[budm]

Re: Sharp aquos LC-40LE810E

Ooops, double post.

[budm]

Re: Sharp aquos LC-40LE810E

Any, even we are not getting the correct AC-DET signal regardless, you still should be able to fool the main board using the resistor to pull AC-DET high, you did pull the AC-DET wire off the PD female connector when you use the resistor the second time but the TV will still not start, right?
To me that is a bigger problem if you cannot get it to work as before.

[budm]

Re: Sharp aquos LC-40LE810E

BTW, PD-9 (AC-DET pin) is not driven directly by the OPTO.

[Nightmare0]

Re: Sharp aquos LC-40LE810E

Omg.... I am tired and retarded..... I really soldered that resistor on top of.wrong resistor. f-ck, sorry for your time.... Going to fix that....

[Nightmare0]

Re: Sharp aquos LC-40LE810E

You want ne to measure voltage between marks + and - vcc1? It will take me some time,.since its back side of pcb and I am putting it back to tv every time. I have to figure out. Just tell me if to measure between these +- pads. I will solder some wires and.measure

[rievax_60]

Re: Sharp aquos LC-40LE810E

everything in post 63 looks correct.