Re: Dell E172fpb
Just fixed the Dell again, this time one the original transistors failed; a dead short between all pins. Noticed that even with pulsating the circuit gets hot quickly. If one leaves the monitor on this could over a period of time cook the pcb and even a tranny. So as a precaution turn off the power to the monitor when not in use, this this should reduce the secondary damage from occurring. After sketching out a circuit there are two caps with a value of 0.15j x 100v they are connected to the collectors push pull inverter cct. This causes the switching waveform from being square wave to be more sinusoidal one, with a consequence of increasing power dissipation.
Just fixed the Dell again, this time one the original transistors failed; a dead short between all pins. Noticed that even with pulsating the circuit gets hot quickly. If one leaves the monitor on this could over a period of time cook the pcb and even a tranny. So as a precaution turn off the power to the monitor when not in use, this this should reduce the secondary damage from occurring. After sketching out a circuit there are two caps with a value of 0.15j x 100v they are connected to the collectors push pull inverter cct. This causes the switching waveform from being square wave to be more sinusoidal one, with a consequence of increasing power dissipation.
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