Sharp aquos LC-40LE810E

[Nightmare0]

Re: Sharp aquos LC-40LE810E

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

[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

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.

[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.

[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.

[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.

[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.

[budm]

Re: Sharp aquos LC-40LE810E

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

[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.

[Nightmare0]

Re: Sharp aquos LC-40LE810E

Ok then. And what about that donate?

[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

I know. I was asking, if you both will get something of that :-)

[rievax_60]

Re: Sharp aquos LC-40LE810E

I suspect that most members are happy enough to help, so long as it doesn't become too frustrating.
If you want to donate, it should be to this forum which enables members to help each other.

[Nightmare0]

Re: Sharp aquos LC-40LE810E

I just wanted to donate straight to you. Anyways I will donate at least to this site. Thank you

[angel-boy]

Re: Sharp aquos LC-40LE810E

hy , i have the same problem
and I took out pin 9 - AC-DET an just plugged it next to pin 11 - 5v , the tv power on now,

so the next step will be to change 68k smd resistor and also 33k and 4 opto-couplers ?

[rievax_60]

Re: Sharp aquos LC-40LE810E

The previous posts don't say exactly that. The safest and most direct action is to add a 68K on top of R7019. It is next to Q7802. Look at post 79.

[angel-boy]

Re: Sharp aquos LC-40LE810E

I fix the tv , teste first time with pin 9 , plugged in pin 11, and replace R7019 with 34k resistor , and finish , tv works great

[sathishbds]

Re: Sharp aquos LC-40LE810E

Is there the pins (9/AC_DET) of P9601 at “H”?

what is mean by "H" here?? Can i anyone tell me. Thanks in advance.

[budm]

Re: Sharp aquos LC-40LE810E

Normal condition AC-DET = H (HIGH) = >2.5V, typical for this board is around 3~3.5VDC range, L (LO) = <1V for fault condition.
AC-DET signal tells the main board if the incoming AC is within the operating range of the power supply or not.

[meme123]

Re: Sharp aquos LC-40LE810E

Hi, I'm a Sharp Acua lc 810 with a fault similar to the holidays but the flash is frequent and does not stop please help outside flute 5 v only