Hi,I am new to this site.
I have a Halfords 2 or 4amp,switched mode car battery charger made,about 10 years old. It was working fine,until I went to use it last week.When plugged in there are no Leds on,and no voltage on the output, a good 12v car battery has to be connected for the charger to work.I have opened the plastic case and done many checks for any component burn marks or short circuits. The circuit uses a Fairchild FAN7554 PWM controller,with a Fairchild FQPF10NC60C N channel Mosfet as the switching device. I have a Fairchild FAN7554 general application sheet. The FQPF10NC60C device was not shorted,after replacing with new device,no change.I am able to read the DC supply voltage of 330v DC,on the 100uf storage capacitor. I believe the FAN7554 is not working because it does not seem to have a starting or running voltage.If needed I will replace it,but would like to find out it is faulty first. Any help would be gratefully received.
I have a Halfords 2 or 4amp,switched mode car battery charger made,about 10 years old. It was working fine,until I went to use it last week.When plugged in there are no Leds on,and no voltage on the output, a good 12v car battery has to be connected for the charger to work.I have opened the plastic case and done many checks for any component burn marks or short circuits. The circuit uses a Fairchild FAN7554 PWM controller,with a Fairchild FQPF10NC60C N channel Mosfet as the switching device. I have a Fairchild FAN7554 general application sheet. The FQPF10NC60C device was not shorted,after replacing with new device,no change.I am able to read the DC supply voltage of 330v DC,on the 100uf storage capacitor. I believe the FAN7554 is not working because it does not seem to have a starting or running voltage.If needed I will replace it,but would like to find out it is faulty first. Any help would be gratefully received.
