Re: LG 42LE4900 no backlight, possibly no display

is there a way i can test the led strings without pulling the screen apart as it looks quite delicate.

ive got a bench psu that will go upto 30vdc 5a.

also have a scope, multimeter etc.

Re: LG 42LE4900 no backlight, possibly no display

plus when you plug it in it goes to standby then if you press the side button it tries to startup and there is a click as if the power board is trying to supply the LEDs.

Re: LG 42LE4900 no backlight, possibly no display



wouldnt it flash some sort of error on the power led if it was that? ive got a cheap rework tool i could heat it up with, though i always think im going to end up cooking the IC when using such temps. certainly back when i started electronics we were always taught not to hold the iron on the pins and work round the pins diagonally....

im trying to sort a 42LE4900, it turns on does its cylon red light thing with the power led then that goes to white but nothing on the screen. no backlight and from what i can see no display. there is a click from the driver board like a relay closing.

measured the voltages on the backlight connectors to the metal back plate and get 65v red 0v black 11.5v black this is the same for all the used connector pins apart from one that reads 9.5v.

ive tried to disconnect the main cpu board as id heard it should then just fire up the leds when power is applied, but this didnt...

Re: New Members - please post your introductions here

fairly new to actually fixing stuff down to component level, but always been into electronics and computers. these days like to fix old 8 and 16 bit stuff.