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Posted by M. 4Gani under Electronici:
Modification of IBM notebook power supply
How can I modify the output of power supply from 16.8 to 12 volt?
Most of the switched mode supplies are normally provide with a reference voltage to regulate the output, which is the heart of the device.
Identify the voltage divider:
First I opened the case and looked for the feedback circuit and voltage divider.
Then, I tried to locate the two resistors that are responsible for setting the output voltage.
The stabilization of the output voltage can be archived in the same way as TL431 (TL431 will be used in chip switching mode supplies and you can find many documents about its functionality in internet).
I already knew, that the location these two resistors can be found near the opt-coupler.