42lg3000-za No Picture but got sound

[majterix]

Re: 42lg3000-za No Picture but got sound

Can you give the name and voltages on the two connectors shown.

Photo courtesy of Shopjimmy

where is the true way to take the volts? i measure from the red place only the negative to the other . if i pul out the white cable i make measured the red place and take zero volt..if i pull in the white cable i take 24 volt and five volt to the red place. now to take measure only the white place i have only the five volt not the 16 volt...if you wait i can sent a foto

[majterix]

Re: 42lg3000-za No Picture but got sound

no i have not 16,3 volt and i have not 12 volt i have only five volt. to the white place of the volt who it send volt to the video card. what i have to look to the power suply?

[dick_barton]

Re: 42lg3000-za No Picture but got sound

Please give the name written alongside the pin and the voltage you read

White connector
Pin1----> Pin 12

Red connector
Pin1----> Pin 12

[majterix]

Re: 42lg3000-za No Picture but got sound

ok

[dick_barton]

Re: 42lg3000-za No Picture but got sound

Can you give the pin names because I cannot read all of them from the photo and they are needed to help you.

[majterix]

Re: 42lg3000-za No Picture but got sound

i have send you three fotos .please check the fotos to be sure what i send you

red connector is easy
pin 1,2,3,4,5 is 24 volt pin 6,7,8,9,10 is the ground-negative pin 11 is zero volt and pin 12 is 5 volt



now to the white connector
here we have 24 pins from count from down to up
pin 1,2,3,4,5,6,7,8 is 0 volt zero volt
pin 9,10,11,12, and 18 have 5 volt
all the other 0 volt so i dont have 16,3 volt ad 12 volt

[dick_barton]

Re: 42lg3000-za No Picture but got sound

You have the standby voltage, 5V at Pins 9,10,11 & 12
You have ACD Pin 18

You are missing the ON/OFF (Pin 20) and PWR_ON (Pin 19) voltages.

To test, disconnect your main board from the power supply.
Connect a 1K resistor from 5V to PWR_ON
Power on the set

Does the 16.5V supply come on?
Do your backlights come on?


If they do not then power off your set and connect a second 1K resistor from 5V to ON/OFF and try again.
__________________

[majterix]

Re: 42lg3000-za No Picture but got sound

i have 16,3 volt with the two cases.... with one and with two resistors.... but the screen open again for one secont and go black screen again.. and i put all connectors again and i have normal screen for one secont i just see the logo hdmi1 and black screen but i have sound

[dick_barton]

Re: 42lg3000-za No Picture but got sound

What voltage do you have on Pin 17 (Error) when you run the test with the 2 resistors in place.

Can you post sharp pictures of your inverter boards Master and Slave

Worth checking the fuses out on the two boards
https://www.badcaps.net/forum/showpo...&postcount=117

[majterix]

Re: 42lg3000-za No Picture but got sound

i have tried to write you many times but i have internet log off broblems

[majterix]

Re: 42lg3000-za No Picture but got sound

i have change the inverters with new because i check and they was broke ..to the transistor caled nikos

[majterix]

Re: 42lg3000-za No Picture but got sound

i have to sleep and tomorow i check the pin 17 and i send you fotos with the new and old inverters

[majterix]

Re: 42lg3000-za No Picture but got sound

hello to everybody...i check again and i have new.....i have meter with my voltometer in open tv the conectors from power suply to tv tuner and i have this values..
,,pin 1 is 16 volt
pi2 is 16 volt
pin3 is zero volt
pin 4 zero volt
pin 5 12 volt
pin6 12 volt
pin 7 zero volt
pin 8 zero volt
pin 9 5 volt
pin 10 is 5 volt
pin 11 is 5 volt
pin 12 is 5 volt
pin13 is zero volt
pin 14 is zero volt
pin 15 is zero volt
pin 16 is zero volt
pin 17 is zero volt
pin 18 is 5 volt
pin19 is 2,9 volt
pin 20 is 5 volt
pin 21 is o volt
pin22 is 3,2 volt
pin 23 is zero volt
pin 24 is zero volt

[majterix]

Re: 42lg3000-za No Picture but got sound

this foto is beter

[dick_barton]

Re: 42lg3000-za No Picture but got sound

This is very difficult to read because you do not say what is Pin1, Pin2 etc.


Post #127
Do you have ALL the voltages when you carried this out?
5V, 12V, 24V, 16.5V etc

[majterix]

Re: 42lg3000-za No Picture but got sound

,pin 1 is 16 volt
pi2 is 16 volt
pin3 is zero volt
pin 4 zero volt
pin 5 12 volt
pin6 12 volt
pin 7 zero volt
pin 8 zero volt
pin 9 5 volt
pin 10 is 5 volt
pin 11 is 5 volt
pin 12 is 5 volt
pin13 is zero volt
pin 14 is zero volt
pin 15 is zero volt
pin 16 is zero volt
pin 17 is zero volt
pin 18 is 5 volt
pin19 is 2,9 volt
pin 20 is 5 volt
pin 21 is o volt
pin22 is 3,2 volt
pin 23 is zero volt
pin 24 is zero volt

for the white conector

[majterix]

Re: 42lg3000-za No Picture but got sound

the white conector

[dick_barton]

Re: 42lg3000-za No Picture but got sound

You do not say if you still have 24V but it looks as though you have all the voltages.

If that is the case then I believe the fault must be with one of the inverter boards (Master/Slave) or with one of the CCFL tubes.

[majterix]

Re: 42lg3000-za No Picture but got sound

i have 24 volt for the inverters...how to check again if the new inverters from china is ok ? i have check all the capasitors all the tranzistors with product name ( nikos) i check the fuse...the ccfl lamps need 1000 volt dc? i have a new tester for led tv...the output volt is 110 and 220 and 240 volt dc...can i use it to check the lamps?

[budm]

Re: 42lg3000-za No Picture but got sound

Firing Volateg for the CCFL can be as high as 2000VAC!
We need to see the whole back side of your TV so we can see all the boards.
So far you did not show us the pictures of your inverter board/s.
Do you get BL-ON (INVR-ON, ON/OFF) control signal at the inverter?