Re: Sony KDL-49WE663 red led blinks 6 times

Would you think it would make any difference if this 22uH inductor is replaced with 33uH for testing?
Just something I have laying around.

Re: Sony KDL-49WE663 red led blinks 6 times

No short at the pins to chassis.



I will try and replace the inductor. But I measured it again it was near 1 Ohm....

Re: Sony KDL-49WE663 red led blinks 6 times

Diode that is shown near the gate of the mosfet is not in this PCB instead there is 1 resistor which measured ok 68 Ohm.

The schottky diode measures ok.

Zener diodes also ok at least no short.

The inductor gets very hot. There must be a short somewhere but I would think there would be other components also get hot they are shorted but cannot find any.

Underside does not have any components....

Re: Sony KDL-49WE663 red led blinks 6 times

VCC pin 1 is 18.8V
Reg9V pin 3 is 8.9V

Mosfet is not shorted.

Hi.

I'm working on a Sony KDL-49WE663 and when I first turned it on it was blinking red 6 times.
I opened the TV and saw an inductor was fallen off the power/LED driver board so I soldered it back on and tested again, TV turns on and seems fine but the inductor heats up really fast and fell off again.

Then tested the backlight LEDs they all seem fine with LED backlight tester, every LED lights up. I even measured current draw to all individual LED which was around 27 mA.
Haven't found any shorts after hours of testing.
Inductor is about 4.5 Ohms....

Re: New Members - please post your introductions here

Hello everyone.

I really like fixing broken electronics and that is reason I joined this forum. Currently working on a Sony TV which I'm hoping someone in the forum can give me some hints on.

Thanks!