Re: lg 47le5400 powers up, black screen, no sound

Got LG 47LE5400 with the same symptoms: black screen, no picture. The voltages on the cable that supplies power on the main board (there is a table on the white power supply board with voltages and pins) are as expected. I also tried to put 3.5V on PWR_ON and DRV_ON on unplugged cable and got the TV turning on but no backlight.

Ended up heating two BGA chips that are under heatsinks (preheat the whole board for around 100C for 10 min, put flux around chips, heated the chip on 320C for 5-6min, then got down to 200C for...