Re: Sylvania lc320ss2 LCD TV keeps blowing fuse
Hi,
A little update.
We saw some improvement today after installing the replacement transistor.
For the first time this tv showed some signs of life.
With the lightbulb connected, the TV would show signs of what I believe is right. It would turn the light bulb on and off continuously, the stand-by led would be on, and the panel's lamps would come on and off too. I'd get a variable voltage on the power FET's gate and on the output diodes I'm getting more appropriate voltages too.
But when connected to the Variac (with the fuse installed instead of the lightbulb) and feed about 10VAC, it's still drawing above 2 amps and the voltage at the FET's gate is not switching.
The whole primary side still gets warm as before.
I was suspecting the opto-isolator IC but I replaced it with a good one (although different specs) and it didn't change a thing.
I'll take a closer look at the zener diodes and some other components around the FET's gate again to see if I can spot something.
Regards,
Hi,
A little update.
We saw some improvement today after installing the replacement transistor.
For the first time this tv showed some signs of life.
With the lightbulb connected, the TV would show signs of what I believe is right. It would turn the light bulb on and off continuously, the stand-by led would be on, and the panel's lamps would come on and off too. I'd get a variable voltage on the power FET's gate and on the output diodes I'm getting more appropriate voltages too.
But when connected to the Variac (with the fuse installed instead of the lightbulb) and feed about 10VAC, it's still drawing above 2 amps and the voltage at the FET's gate is not switching.
The whole primary side still gets warm as before.
I was suspecting the opto-isolator IC but I replaced it with a good one (although different specs) and it didn't change a thing.
I'll take a closer look at the zener diodes and some other components around the FET's gate again to see if I can spot something.
Regards,
Comment