Re: Philips 40PFL4707 SMPS fuse blown.
Dear Forum Members
Some good news. I may have done some wierd debugging and burnt few components, but looks like I have managed to get the board finally working.
Apart from repairing, my intent was to study and understand the entire circuit so I did debugging separately, and this helped me to get a decent understanding of the circuit.
The entire primary and secondary is now connected, the fuse does not blow and I do get 3.3v at pin11 of CN501. As per the manual, this is correct behaviour. If I short the pin11 3.3v to P-ON-H1 and P-ON-H2, the SMPS will start in full power mode.
Now, a question
1. Do you suggest me to connect this board to the entire TV and have TV as a proper load and then start the TV ? Doing this scares me a bit as not sure if the SMPS is fully repaired and working in full power mode. and I have no intentions to damage the rest of TV
2. Or do you think I should connect a dummy load resistor across the secondary outputs to simulate the TV load ? I am slightly worried and thinking on these lines because if I start the SMPS in full power mode and if there is no load, there may be some surprises and blow something again in SMPS
Dear Forum Members
Some good news. I may have done some wierd debugging and burnt few components, but looks like I have managed to get the board finally working.
Apart from repairing, my intent was to study and understand the entire circuit so I did debugging separately, and this helped me to get a decent understanding of the circuit.
The entire primary and secondary is now connected, the fuse does not blow and I do get 3.3v at pin11 of CN501. As per the manual, this is correct behaviour. If I short the pin11 3.3v to P-ON-H1 and P-ON-H2, the SMPS will start in full power mode.
Now, a question
1. Do you suggest me to connect this board to the entire TV and have TV as a proper load and then start the TV ? Doing this scares me a bit as not sure if the SMPS is fully repaired and working in full power mode. and I have no intentions to damage the rest of TV
2. Or do you think I should connect a dummy load resistor across the secondary outputs to simulate the TV load ? I am slightly worried and thinking on these lines because if I start the SMPS in full power mode and if there is no load, there may be some surprises and blow something again in SMPS
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