i was repairing a home amplifier when it "unrepaired" itself. help?
i replaced a few burnt out parts and tried it out. nothing.
then, while using my multimeter to check things, i noticed the main transformer wasnt putting out any voltages. this lead to more probing around a mosfet when suddenly the VFD lit up and the device appreared operational. my multimeter had shorted out two contacts and that led to the system starting up the way it should, rather than just turning on the LEDs.
i turned off the device and turned it back on, and just the LEDs lit up. then i went back with my multimeter to the same spot and t started again!
so i went and soldered two wires and a load (resistor) and went back to try again. the resistor burned, and the device did not power up properly. i tried again with my multimeter and nothing.
i removed the wires and tried again, and still nothing. now im really confused with whats going on here. can anyone help?
attached a photo. it was taken before any repairs were done, but the two points are labeled.
the chip is a pwm controller, and the pin labeled is VCC