Sharp LC-40LE810UN question

[Mt.Man]

Re: Sharp LC-40LE810UN question

Had a LC-40LE835U last week that uses the same power board. It also had a 2 long, 5 short error with no back lights coming on.
Turns out the panel was cracked. The TCON senses an voltage error on the panel and produces the 2 long, 5 short panel power error.

Try forcing on the TV, which should power up the back lights. On the TV touch pad, Press and hold Vol DN and Ch Up, while holding those press PWR. Do not release PWR till the icon LED lights steady then release the PWR button only but still hold the other 2. The back lights should come on.

[tibimakai]

Re: Sharp LC-40LE810UN question

The voltages are 13.04V and 6.38V.
Thanks for the schematics, I will have to look at them.

[olegi]

Re: Sharp LC-40LE810UN question

here is similar schematic

[tibimakai]

Re: Sharp LC-40LE810UN question

It was exactly the same as mine, so no reason to keep it. I will let you know about the voltages, now I'm at the beach.

[olegi]

Re: Sharp LC-40LE810UN question

You said that you have bought 2nd power supply .Do you have same reading on this connector ?When you have on pin #10= 3.03V(PS_ON) there has to be ~400V on main caps.Can you tell what is the voltage on C7961A ;C7962A for first 10 sec til you get error code?

[tibimakai]

Re: Sharp LC-40LE810UN question

OK, to bring back the attention I'm posting the measurements that I have at the PS connector.
So it takes a couple of seconds to turn on, as Olegi said like 10 sec.
When the TV is turned on, I have the right voltages(not sure about the PWR_POW at pin#12).
#1-2= 13.02V
#3-4= 13.02V
#5-6= 0V(GND)
#7-8= 0V(GND)
#9= 3.13V(AC_DET)
#10= 3.03V(PS_ON)
#11= 5.02V(STBY)
#12= 0.12V(PWR_POW)
When the blinking code comes up, the only voltage is left is the standby.
I know that the 400V is missing and that is most likely the problem of this TV.
I guess we have to look at the DAC002, am I right?
When the TV comes on the 168V drops to 155V and then back up to 168V when tghe code kicks in.

[tibimakai]

Re: Sharp LC-40LE810UN question

So, what should be the next step?

[olegi]

Re: Sharp LC-40LE810UN question

Signal (PD-9)AC-det is output signal from Q7061 to detect it they use 3rd optocoupler PC7703

[tibimakai]

Re: Sharp LC-40LE810UN question

I don't think this power supply is as simple as other TVs. This is probably has a smart power supply also, since the TV is a smart TV(kidding).
I see an AC detect there, I guess that one has to receive some signal too, no?

[tibimakai]

Re: Sharp LC-40LE810UN question

Nothing happens.

[olegi]

Re: Sharp LC-40LE810UN question

Hi tibimakai,can you remove all cable from power supply lave only 110v ,apply PS_ON manually and see V on main caps.Post results.

[tibimakai]

Re: Sharp LC-40LE810UN question

OK, T-con is not receiving anything.
Point
#1= 5.555V
#2= 13.04V
#3= 13.04V
#4= after like 10 sec. becomes 12.17V for a second and then drops toward 0V.
#5= 0V(alternates between + and -)
Here are the pictures:

[tibimakai]

Re: Sharp LC-40LE810UN question

I was alone with my 4 year old daughter and didn't have time, but later today I will measure and take pictures.

[olegi]

Re: Sharp LC-40LE810UN question

"I thought back in post #144 you said there is 3V on the PS_ON line?"
That was then, now I guess it's different, but just to be sure, tomorrow I will measure everything again and take pictures as requested.

Did you measure again ,do you have pictures?

[tibimakai]

Re: Sharp LC-40LE810UN question

"I thought back in post #144 you said there is 3V on the PS_ON line?"
That was then, now I guess it's different, but just to be sure, tomorrow I will measure everything again and take pictures as requested.

[Alohamora]

Re: Sharp LC-40LE810UN question

As I stated in 204, I do not believe he is getting the PS_ON signal from the main board to turn on the PFC and the backlights and the PL on 12V transistor Q7908??? at the bottom right of the board close to the PL connector. He may have to apply PS_ON signal manually.
Aloha, please see post 206, which is what the error code he had indicated.

Yes, I am agreeing with what you suggested in post #206 and 207. Check for the panel 12V on the PL connector.

Now that I've re-read the earlier posts, I see that it has the same error code with both power boards, that is why I assumed it would not be a power board issue.


T-con and LVDS cable remain the most likely causes of the error code.

Tibimakai -
I thought back in post #144 you said there is 3V on the PS_ON line?

[tibimakai]

Re: Sharp LC-40LE810UN question

Whow guys.
It's late to do any measurements, but I can tell you that I don't have PS_ON. How about AC_DETECT?

[budm]

Re: Sharp LC-40LE810UN question

The bad thing is that, it is called service manual, but it does not have any circuit diagrams in it at all.

[olegi]

Re: Sharp LC-40LE810UN question

PD pin 5-6 are labeled as SOUND. Where is this pin #6? Pin 10 is PS_ON.
Are you talking about pin6 of LB connector?
OK, the LAMP ERROR signal, he will just have to use pull-down or pull-up, not clear in the manual (HI FAILURE? on page 6-16) resistor to fool it.

Yes it is pin 6 of LB connector ,To fool it ,he has to check what he has now .To put power ON he has to pull-up pin10 PS_ON to 5V

[budm]

Re: Sharp LC-40LE810UN question

PD pin 5-6 are labeled as SOUND. Where is this pin #6? Pin 10 is PS_ON.
Are you talking about pin6 of LB connector?
OK, the LAMP ERROR signal, he will just have to use pull-down or pull-up, not clear in the manual (HI FAILURE? on page 6-16) resistor to fool it.