Hello,

I'm trying to repair my LCD tv. I found that one of the resistors burn out. Can someone help me to find what caused the resistor to burnout. The resistor is 0.15ohm. I also found a schematic for the board.

Thanks!

 

Welcome to the forum. The first thing I would suspect is a shorted Q9801.

 

Welcome to the forum. The first thing I would suspect is a shorted Q9801.

Thank you for the welcome Peter. I will try and measure this mosfet.

 

That's the current sense resistor for Q9801, chances are it's blown, check the diodes too.

 

That's the current sense resistor for Q9801, chances are it's blown, check the diodes too.

Will check them too. Thanks!

 

After a closer examination I realized is not the resistor that burned but the blue capacitor in the proximity. I measured the mosfet and diodes and they seem ok. It possible it only the blue capacitor that shorted?

 

After a closer examination I realized is not the resistor that burned but the blue capacitor in the proximity. I measured the mosfet and diodes and they seem ok. It possible it only the blue capacitor that shorted?

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Hi, You are right, The Capacitor is damaged and the Resistors are ok. Replace the Capacitor. Probably your power supply will be repaired.
good luck.

 

Does the TV power up, can you measure any voltages?

 

Does the TV power up, can you measure any voltages?

No, I cant. The fuse blow on power connect.

 

Check the diodes U9901 and BD9901 for shorts,

 

Good news guys, it seem it was only the shorted capacitor. Changed it with another one and boom it is working. You think is bad I switched a 101 1kv with a 102 2kv capacitor. I know it 10 times bigger but for now is working.