Sharp 70" LC-70LE734U : No Picture : 2 Slow - 3 Fast

[budm]

Re: Sharp 70" LC-70LE734U : No Picture : 2 Slow - 3 Fast

Thanks!
One thing that did not make sense on that thread is that he does not get any error blinking codes at all.

[R_J]

Re: Sharp 70" LC-70LE734U : No Picture : 2 Slow - 3 Fast

I have this excerpt from my LC60LE632U manual if it helps

[Inverted]

Re: Sharp 70" LC-70LE734U : No Picture : 2 Slow - 3 Fast

PD
Pin, Vol, Name

1. 12.2 : Pnl_12v
2. 12.2 : Pnl_12v
3. 0 : Sgnd
4. 0 : Sgnd
5. 13.43 : Ur13v
6. 13.43 : Ur13v
7. 13.43 : Ur13v
8. 13.43 : Ur13v
9. 0 : Sgnd
10. 0 : Sgnd
11. 0 : Sgnd
12. 0 : Sgnd
13. 3.32 : Ac_det
14. 2.85 : Ps_on
15. 5.06 : Bu+5v
16. 3.27 : Pnl_pow
17. 0 : Vsync
18. 3.28 : Scl
19. 1.98 : Nc
20. 3.28 : Sda
21. 0.4 : Ofl
22. 3.29 : Error
23. 0 : Nc
24. 3.25 : Stb

This is the board that throws the 1-1 error, but that I can get the tv to turn on with by holding vol+ and channel-. If you scroll up to the very first post, you can compare to the board where I cannot get the screen to turn on and it throws the 2-3 error.

I am confused by pin 19 that shows not connected(there isn't even solder on it on the backside, but it still has a voltage)?

[budm]

Re: Sharp 70" LC-70LE734U : No Picture : 2 Slow - 3 Fast

Thanks! So the ERROR pin according to service manual, it is for the Backlights error.
When ERROR is present, it will be low (<1VDC, and when there is no error it will be around 3VDC, I went through many service manuals to find out but no info, so thanks to you now I know what it should be.
Now back to that thread.

[Inverted]

Re: Sharp 70" LC-70LE734U : No Picture : 2 Slow - 3 Fast

Do you think it would cause any harm if I jumper error to ac_det on the main board I have that isn't working? Do I need to use a resistor or can I just use a piece of wire?

[mmartell]

Re: Sharp 70" LC-70LE734U : No Picture : 2 Slow - 3 Fast

So I just tried menu 2489. What am I supposed to see happen? I hit menu on the remote and it obviously brings up the tv menu, then when I hit 2, it starts acting like I am entering a channel to go to, once I enter 2489 and then wait about 2 seconds it just goes back to displaying the current channel number that it is on.

It's supposed to bring up another menu with four options - obviously doesn't work on your set.

[vinceroger69]

Re: Sharp 70" LC-70LE734U : No Picture : 2 Slow - 3 Fast

its odd you cant get into the service menu at all i wonder if a faulty mainboard could stop you getting into it?

[Inverted]

Re: Sharp 70" LC-70LE734U : No Picture : 2 Slow - 3 Fast

I may have come up with a new mainboard locally to try. If it throws the 1-1 error can I be fairly certain that it is an issue with my backlighting at that point?

[Inverted]

Re: Sharp 70" LC-70LE734U : No Picture : 2 Slow - 3 Fast

Came up with another FM24S board to try. I immediately tried to go into service mode the first time I powered it on since someone has said that if it throws the 1-1 error 5 times the board is toast? Anyways, same thing happened, it had the solid light for eight seconds and then threw the 1-1 error again. So I guess I need to either take a look at the back lighting or just use vol+ and channel- to override the error and use the tv that way...

[tjmethod]

Re: Sharp 70" LC-70LE734U : No Picture : 2 Slow - 3 Fast

Bud my 19th pin on the PD is soldered, anyway but since there's no response from the key control board showing any error codes, I checked the RA where the key control board plugs in to the main and these were the voltage readings I got, there were no voltage around it printed on the board that I could see. Of course the last four oins are the key board controller.
Pin 1. - 0.00V
Pin 2. - 0.00V
Pin 3. - 0.00V
Pin 4. - 3.25V
Pin 5. - 3.20V
Pin 6. - 0.74V
Pin 7. - 0.00V
Pin 8. - 0.00V
Pin 9. - 0.00V
Pin 10. - 0.00V
Pin 11. - 0.00V
Pin 12. - 0.00V
Pin 13. - 3.25V
Pin 14. - 3.15V
Pin 15. - 3.15V
If these voltages are correct then this would point towards the key control board may have failed since we cant get blinking error codes?

[Caio Fabio Souza]

Boa tarde, alguém pode me informar a descrição do integrado, que está presente na posição IC7905 na Placa Fonte.

Att