Sharp LC-40LE810UN question

[tibimakai]

Re: Sharp LC-40LE810UN question

I think we have to hold on a bit with all these ideas.
We get carried away and we are not covering the basics.
Right now I'm using the original board and it seems that is working "OK" up to a point.
I'm saying it's OK up to that point where are the two capacitors(brown and black), there I have the 5.5V respectively the 13.2V.
Another problem is that I'm seeing is that the 13.2V it's not reaching the mainboard. Only the 5.02V goes through.
If I measure the two power double diodes, at the middle pins I should measure 5V respectively 13.2V, no? The 13.2V it's not there.
No 400V either, only the 168V.

[Alohamora]

Re: Sharp LC-40LE810UN question

I think we have to hold on a bit with all these ideas.
We get carried away and we are not covering the basics.
Right now I'm using the original board and it seems that is working "OK" up to a point.
I'm saying it's OK up to that point where are the two capacitors(brown and black), there I have the 5.5V respectively the 13.2V.
Another problem is that I'm seeing is that the 13.2V it's not reaching the mainboard. Only the 5.02V goes through.
If I measure the two power double diodes, at the middle pins I should measure 5V respectively 13.2V, no? The 13.2V it's not there.
No 400V either, only the 168V.

Once the unit shuts off with any error code, there will not be any voltage present to the main board, other than the 5V standby. You only have a very short time to check for the panel 12v. I was assuming you got a replacement power board from a reliable source and we could assume it was OK? We all know what you get when you assume too much.

[tibimakai]

Re: Sharp LC-40LE810UN question

I'm measuring before the error code.

[budm]

Re: Sharp LC-40LE810UN question

OK, you are working on the original board and you had fixed the switched 5V and the switched 13V supply, but the PFC is still not working, so for the PFC to come on, the main board will have to send the PS_ON to turn on the PFC, but since you are getting the error code, then we need to really find out what that error means since we got two answers for it.

[olegi]

Re: Sharp LC-40LE810UN question

Post 191 "Last week I had same model 60" (two long 5 short). SHARP 60" has full 4 LED strings .Problem was Only 1 single led of one string"
Post 197 "2 long, 5 short error rarely has anything to do with the backlights. If the power board is good, and you get the same error code with *both* cables between t-con and panel disconnected, that leaves the t-con board or LVDS cable.

Bad backlights give 1 long, 1 short error code"

Which one is the correct one? Looks like I will have to download the service manual to find out.
In the mean time, cam you leave the meter on pin16 and see if the VCC voltage even jumps up when you first turn on the TV, that way we can tell if it even try to turn on.

I don't know from where Post 197 take assumption ,please check post 164.I attached service manual for SHARP 40 to 60 " Please check page 6-16

[budm]

Re: Sharp LC-40LE810UN question

Ok, so it looks like it is not getting 12v feedback from the T-CON to tell the processor that it is not receiving the 12V. So I would suggest to look at the PL connector P4804 4-PIN to see what voltage he has on those 4pins. I can see that the power applied to this connector is supplied to the switching supplies on this T-CON board.

[budm]

Re: Sharp LC-40LE810UN question

So 2-slow, 5fast = PL 12V ERROR CODE.
OK, please tell me the voltage readings at those red circles, black probe to the chassis. We need to find out if we are getting 12v at the PL connector or not. I also need good pictures of that section.

[olegi]

Re: Sharp LC-40LE810UN question

There is not 12v because ( Panel power is not applied)
Detection is started after turning on the panel power and
receiving command; the power is turned off by polling
First needed working power 168v=OFF ~395v =ON on main caps,and working LEDs power supply.

[Alohamora]

Re: Sharp LC-40LE810UN question

I don't know from where Post 197 take assumption ,please check post 164.I attached service manual for SHARP 40 to 60 " Please check page 6-16

Where did I get that? Right on the page you referenced.

Section 2 on that page says one slow flash and one fast flash is a lamp (backlight) error.

Fourth item down in sections 3 says that 2 slow blinks and 5 fast blinks is 12V panel power. (12V panel power is the t-con and LCD power, nothing to do with the backlight)

[budm]

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.

[olegi]

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.

You are right ,he has to remove all cable from power supply only 110v and apply PS_ON manually and see V on main caps

[budm]

Re: Sharp LC-40LE810UN question

That will be his next step, but that means his main board is not sending the PS_ON which another problem he will have to solve also.

[olegi]

Re: Sharp LC-40LE810UN question

That will be his next step, but that means his main board is not sending the PS_ON which another problem he will have to solve also.

Don't forget there is error pin #6 on the connector which goes to main board

[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.

[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

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

[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?

[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

"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.

[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?