Chosen Solution
Hi. I have a Sony Bravia KDL-55NX723, red LED flash 6 times and does not startup. I have taken apart the rear and started troubleshooting this matter. I found a guide to error codes on bravia TV’s and it states : Backlight issue, bad main board, power board or inverter board. I have checked the 3.3 standby Voltage, this is present. The 12 V regulated DC from main PSU to second PSU (Inverter board for LED light??) falls to 0 V when TV is turned on and red LED blink. By removing different cables i can make the TV display different error codes. 1: removing video cable it blinks 5 times. (Bad lcd panel connection) 2: removing what i think is the tuner, it blinks 10 times. This gives me hope that maybe the main board is still OK, since it tries to start/locate this and then gives error code when is discovers a problem. Pictures:
When removing the cabel im pointing at, the green LED starts and stays on for 5-6 seconds, then it cannot start and red LED error is shown. Any ideas as to what is it? Could it be one of the two power boards? Best
You have to replace defective back light defective led strips
