Panasonic TH-L42U5K standby voltage help

[maleksa]

The TV wont turn on and when power is plugged in, the LED will turn from Green to Red and then one Green blink before repeating (Green to Red and one Green blink).

Any pointers is much appreciated.

I also need help to identify which pin is the standby voltage. I only get the 5V for the 2 pins in the attached picture.

[kasfamily]

Re: Panasonic TH-L42U5K standby voltage help

pin 10 and 11 is the standby voltage.

[kasfamily]

Re: Panasonic TH-L42U5K standby voltage help

what is the voltage at pin 16?

[maleksa]

Re: Panasonic TH-L42U5K standby voltage help

what is the voltage at pin 16?

The voltages on the various pins are as follows

Pin 16 - Fluctuates between 2.25V to 0.14V
Pin 12 - Fluctuates between 3.3V to 0V
Pin 11 and 10 - 4.7V
Pin 9, 8, 4 and 3 - 0V


Appreciate your help/pointers

[nomoresonys]

Re: Panasonic TH-L42U5K standby voltage help

More pictures: https://www.badcaps.net/forum/showthread.php?t=39740

[maleksa]

Re: Panasonic TH-L42U5K standby voltage help

More pictures: https://www.badcaps.net/forum/showthread.php?t=39740

Apologies guys. Here are pics of the entire back of the TV, the power board and the main board.

Cheers

[nomoresonys]

Re: Panasonic TH-L42U5K standby voltage help

A test, UNHOOK cable from powerboard to mainboard on mainboard side, use three 1k ohm resistors and jumper from pins 10 and or 11 to pins 12, 14 and 15, one easy way is trace the wires back to the end you unhooked and jumper thru that connector end, plug power cord in, see if backlights come on and stay on and recheck those voltages, see if they are all there and steady.