Re: Lg 65UB950V No Image
Hi, i had tested the backlights... They are good!!! But when i plug in the board, (pwron and drvon with 1k resistor on 3,5v) then the board will give me the 12v and 24v. Also the 80v for backlight i get, but only for 3 seconds, the the 80v go out. And only 3 of the mosfets switched the backlights on (3 of 12) all the other mosfet do not switch!! There must be a problem with the led driver ic!
Megaule
Member
Last Activity: 11-28-2023, 07:10 AM
Joined: 08-11-2023
Location: San Genesio Atesino
-
Re: Lg 65UB950V No Image
Attached file...Leave a comment:
-
Re: Lg 65UB950V No Image
This are the mosfet area on the pwrboard with the led driver, i told all the mosfets, only remains is in place, an one 1 connected with bridges... Thisone in place works... The other not...Leave a comment:
-
Re: Lg 65UB950V No Image
So i demount the complete tv/panel... And the strange thing is that only 3 of 12 led "areas" go on when i make the stand alone test of the power supply. But the other led areas are good because i told the molsfet and give them ground with a bridge... And they work !! But the mosfets are not switching the gnd when i make the test... Only 3 of them... But voltage on gate it is!!!Leave a comment:
-
Re: Lg 65UB950V No Image
How can i test the ledstrips without a specific backlight tester?Last edited by Megaule; 08-25-2023, 07:17 AM.Leave a comment:
-
Re: Lg 65UB950V No Image
Is there any service manual of the tv or power bord to identify the flashing led error codes??Leave a comment:
-
Re: Lg 65UB950V No Image
Yes in this case the backlight go on for 3-4 seconds then go out... You mean if the backlight are good, so in pb stand alone test they have to remain on, if i understand right...Leave a comment:
-
Re: Lg 65UB950V No Image
When it is so, then i do not understand why the system don't light up the backlight, and then the system "see" that there is a problem and told the drvon signal and goes in error state. But when i spower on the tv, there isn't a drvon signal, will mean the tv do not get "test" the backlight.... Probably the mainboard is in permanent error status!?!
Excuse my english, but i hope you will understand me....Leave a comment:
-
Re: Lg 65UB950V No Image
I tested also the caps on the psb... All ok...Leave a comment:
-
Re: Lg 65UB950V No Image
So i test only the psb, with mainboard and tcon completly disconnected. I pull pwron and drvon up to 3,5v with 1k resistor. I have all votages, 12v and 24v. The 82v for backlight goes on 72v ca but only for 3-4seconds, the backlight will turn on for this time, then the bl voltage goes to zero and the errorled flashes 3 times!!Leave a comment:
-
Re: Lg 65UB950V No Image
Always with 12v directly conected to tcon i pull up the drvon signal to 3,5v with 1k resistor. Same problem only that the errorled flashes 7 times now....Leave a comment:
-
Re: Lg 65UB950V No Image
Now i conected the tcon 12 v supply direct to the psb, and the light zhat shows tcon = on on the mainbord will go on and remain on. But the "errorled" on psb flashes 5 times like before... So same error!!??Leave a comment:
-
Re: Lg 65UB950V No Image
So i heated up this area, but nothing... Same problem. But i tried to heat the chip on the tcon and i noticed that after heating the tconchip the led on mainboard that lights up when tcon is on (i think) will light for about 2-3 seconds. When the tconchip is "cold" it will be light up only for a moment about 0,5sec when i try to turn on the tvLeave a comment:
-
Re: Lg 65UB950V No Image
Hi An klamm, thanks for your answer, what for an ic is the cpu?Leave a comment:
-
Re: Lg 65UB950V No Image
Hello here are the fotos, the relays are working... Even if it don't look so🙈😬...Leave a comment:
-
Re: Lg 65UB950V No Image
The pwr supply board is lpg5565-14ul12
Or eay63149101Leave a comment:
-
Lg 65UB950V No Image
Hello, i have this Tv that stops working. When i turn on the LG logo in the front will light up and fade out. I hear the relays clicking and they works, because i replaced them!! I have the 3,5v standyby, when i power on the tv i have also the 12v and 24v! Only the "82,2v" for backlight is missing. On the mainboard the Led ld2300 is on. The led ld1900 (its for tcon =on i think) will shortly light up then go out. I have no Drvon and also the 12v for tcon supply is missing. After ca 15 seconds the led on the power supply board will flash 5 times then pause then 5x....and so on... Errorcode??... -
Re: New Members - please post your introductions here
Hello my name is Ulli, i am from Italyvand ibhope ton find som Help with my "daily" problems 😆😆Leave a comment:
No activity results to display
Leave a comment: