Sharp aquos LC-40LE810E

[budm]

Re: Sharp aquos LC-40LE810E

"Tried that magic trick with resistor again, but this time tv didn't turned on. Not even led. Just red led on mainboard. " I am a little bit confused here, the first time you did not use any resistor between the AC-DET wire ("I took out pin 9 - AC-DET an just plugged it next to pin 11 - 5v. Without any soldering") and the STBY5V, you had it connected directly without the resistor, and now you are using the 330~1K resistor between the 5V and the AC-DET but the TV will not work this time, is that correct?
BTW, what is the P/N of that opto for the AC-DET?
What DCV do you get between pin 1 and pin 2 (the LED side), and between pin 3 and pin 4 (the photo-transistor side)? Notes: The measurement is for between the legs, not with ref to the circuit GND.

[Nightmare0]

Re: Sharp aquos LC-40LE810E

Sorry I confused you. First time that trick was working I used 570ohm resistor. I just plugged resistor next to pin 11 and other end of resistor to pin 9. I never tried that without resistor. Just after opto change that resistor trick didn't worked again. Same as I put original optos back.

That voltages from pin 3 and 4 I got to GND. Voltage of PC7703 between pin 1 and 2 is 0,99V and between 3 and 4 is 2,56V (this voltage goes to 0,08v after tv starts to show error code)

[Nightmare0]

Re: Sharp aquos LC-40LE810E

On opto there is:
Cosmo
1010
817
K20

These are original. I measured pins between 1 - 2 and 3 - 4 like in this photo. Is it correct? I found pin numbers like that on google.

[rievax_60]

Re: Sharp aquos LC-40LE810E

Is that after you added the 68K?. You didnt say. At 2.5v on pin 3 of PC7703, you might see some voltage on the AC-DET but the TV will not start unless AC-DET is solid high level, no pulses.

[rievax_60]

Re: Sharp aquos LC-40LE810E

If pin 3 doesnt go over 3 volts after the 68k is added, then replace PC7703. BTW opto couplers dont like being heated for too long.

[Nightmare0]

Re: Sharp aquos LC-40LE810E

I just added 68k resistor. I forgot to take a photo. Now between 3 and 4 opto leg I am getting 3,06V
Tv didn't started. On AC-DET pin 9 I am still not getting any voltage.

[Nightmare0]

Re: Sharp aquos LC-40LE810E

Leg 3 to gnd is showing 1.68V. Tomorrow i will buy 10 more optos and change all of them again

[rievax_60]

Re: Sharp aquos LC-40LE810E

So you now have 2v on pin 3 to ground? same as before? It should have made a large difference.
Where did you put the 68k? Look at post 279, https://www.badcaps.net/forum/showth...AC-DET&page=14

[Nightmare0]

Re: Sharp aquos LC-40LE810E

I put it on R7019
In that post he is saying R2019 but its typo. If you check photo he really soldered it to R7019
Please check that photo I added in post 63, if I am measuring in correct way.
Leg 3 of PC7703 with 68k resistor soldered on top of existing resistor according my photo to gnd I got 1.68v

[budm]

Re: Sharp aquos LC-40LE810E

What DCV do you have between the two VCC pins as I marked?

[budm]

Re: Sharp aquos LC-40LE810E

I will explain to you later as to why the VDC measured between pin 3 and pin 4 of the opto goes down when you add 68K resistor on the LED drive side. If you look at my picture on post 70 you will understand why.

[rievax_60]

Re: Sharp aquos LC-40LE810E

everything in post 63 looks correct.

[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

[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....

[budm]

Re: Sharp aquos LC-40LE810E

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

[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

Ooops, double post.

[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?

[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.

[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.