Sharp LC-40LE810UN question

[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

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

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

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.

[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)

[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.

[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.

[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.

[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, 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.

[tibimakai]

Re: Sharp LC-40LE810UN question

I'm measuring before the error code.

[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 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.

[budm]

Re: Sharp LC-40LE810UN question

So right now we are working on the replacement board that you installed because the old one will not always get the 5 and 12V output. And the voltage on the two large caps on primary side does not jump up to 400V either?

[tibimakai]

Re: Sharp LC-40LE810UN question

Tha is what I did and from 0.3V went to 0.8V and when the code came up went even more down, to 0.009V.

[budm]

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.

[Alohamora]

Re: Sharp LC-40LE810UN question

I have tried disconnecting each cable at a time from the T-con, with no change.
At this time I'm suspecting the LEDs in the panel.
I will take it apart.
Replacement power supply/inverter board didn't change anything(hopefully it was a good board from partstore), removing the EEPROM didn't change anything, there is only the LCD panel left.

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.

[tibimakai]

Re: Sharp LC-40LE810UN question

Opto :
Cosmo
1010
817
K12
H
Pin#16= 0.3-0.8V then drops when the code starts
Pin#19= 0.46V
It's not getting the Vcc.

[budm]

Re: Sharp LC-40LE810UN question

So what voltage do you at pin 19 and 16 of the DDA002? The one in the primary side that drives the 2 MOSFET's.
And what is the P/N of the Optos that you hsorted the pins?

[tibimakai]

Re: Sharp LC-40LE810UN question

36BS03LJ.
It makes sense, since I'm not getting any increase in voltage at startup.