Hello to all friends of the forum.
I consult the following:
I have a Sony Brand Laptop adapter, model VGP-AC19V10. Departure from 19vdc to 4.7Ah
The fault is that it does not turn on, disarm it to verify the fuse and it is correct, I was measuring voltages and the 160 vdc that comes out of the bridge rectifier is present, after that they pass through a resistor network forming a voltage divider and I have 50vdc. of that voltage, through another resistance low to 1vdc and arrives at the integrated one that in the photo is not present (L6562 PFC).
This integrated is not receiving the supply voltage in its pin number 8, which comes from the transistors that are up, but these transistors also do not get voltage.
I went further to the right and I do not have any tension in the winding of the transformer.
The large capacitor also has no voltage.
I already take out the basic components, diodes, some resistances, the power mosfet, all are fine. They are not open or short.
I understand that this integrated must receive voltage in an instant to activate, close the mosfet and pass the 160vdc to the primary winding of the transformer, and then feed back, but it is not doing it.
So, my question is, really, how can I prove that chip? to know if it's okay.
What else can I check?
Attached photo of the card. The yellow dots are the ones I checked and I put the ones that have tension and the ones that do.
there are 50 volts that are lost, they do not go anywhere, then there is a voltage of 1vdc that reaches IC1.
The red dots are the components that you remove from the card and verify with the multimeter.
Thanks in advance and I remain attentive to your valuable comments
I consult the following:
I have a Sony Brand Laptop adapter, model VGP-AC19V10. Departure from 19vdc to 4.7Ah
The fault is that it does not turn on, disarm it to verify the fuse and it is correct, I was measuring voltages and the 160 vdc that comes out of the bridge rectifier is present, after that they pass through a resistor network forming a voltage divider and I have 50vdc. of that voltage, through another resistance low to 1vdc and arrives at the integrated one that in the photo is not present (L6562 PFC).
This integrated is not receiving the supply voltage in its pin number 8, which comes from the transistors that are up, but these transistors also do not get voltage.
I went further to the right and I do not have any tension in the winding of the transformer.
The large capacitor also has no voltage.
I already take out the basic components, diodes, some resistances, the power mosfet, all are fine. They are not open or short.
I understand that this integrated must receive voltage in an instant to activate, close the mosfet and pass the 160vdc to the primary winding of the transformer, and then feed back, but it is not doing it.
So, my question is, really, how can I prove that chip? to know if it's okay.
What else can I check?
Attached photo of the card. The yellow dots are the ones I checked and I put the ones that have tension and the ones that do.
there are 50 volts that are lost, they do not go anywhere, then there is a voltage of 1vdc that reaches IC1.
The red dots are the components that you remove from the card and verify with the multimeter.
Thanks in advance and I remain attentive to your valuable comments
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