Re: sony kdl55ex720 (led error 4)

Thanks for the reply. I disconnected one of the led strips from the plug and the vcc went up to 260v (which worried me slightly the caps on vcc output are only 250v. I attached a picture of my set if it helps....

i have a sony kdl55ex720 that has backlight problem. The backlight usually comes on for a second or two but sometimes not at all. Flattening the bl_error line going to main power board clears the error (steady green stby light) but makes no difference to the backlight, it still goes out after a second or two. While the backlight is on its hard to tell for sure but i cant see any dark area's, i'm hoping its a board fault not the led's in the lcd panel. There is no change on pin 2 (fail) of the bd9276 on the LD board, cant find any info on the chip so i dont know what triggers the fail signal....

Re: New Members - please post your introductions here

hi, my name is gareth davies, i'm an electronics / software engineer, went to university in wales 12 years ago an stayed here. I enjoy working on embedded systems mostly but now days i find myself working on all sorts of equipment and programing in .net (which is not my favourite environment by far), oh well can't have everything.
This forum looks great, looking forward to some interesting reading