Hello Collin, the problem that you will have that the replacement strips correspond to a lower screen size, you could have less illuminated areas, another problem would be the work tension, surely the 42 "strips have less LED than the 47, therefore the strip of 42 "would be working with a feed voltage calculated for the 47"
I suggest you try to get the strips for the measure 47 ", change them all, they are new, because for this work you must remove the LCD panel, very fragile element
I hope you can solve the problem
Greetings Franco Dosil
Hola Collin, el problema que vas a tener que las tiras de reemplazo corresponden a una medida de pantalla inferior, podrias tener zonas menos iluminadas, otro problema seria la tension de trabajo, seguramente las tiras de 42" tienen menos LED que la de 47, por lo tanto la tira de 42" estarian trabajando con una tension de alimentacion calculada para la de 47"
Te sugiero trates de conseguir las tiras para la medida 47", cambialas todas, que sean nuevas, porque para este trabajo debes retirar el panel LCD, elemento muy fragil
Espero puedas resolver el problema
Saludos Franco Dosil
http://gscs-b2c.lge.com/downloadFile?fileId=KROWM000580073.pdf
http://gscs-b2c.lge.com/downloadFile?fileId=KROWM000572310.pdf
SOURCE: lg led tv backlight
Fault with its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
The control circuit for the LED backlight is most likely located on the main circuit board but it may have a dedicated supply located on the modular power supply.
Most supplies have legends printed on the board and found near the connectors.
With a multimeter, you should be able to verify the outputs,
T-con board and/ or main board. T-con controls the picture elements and the main board sends the picture signals to the T-con board
SOURCE: LG 50la6970 no backlight i have sound and dark images!
Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
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