Re: Altec MX6021
The light bulb trick only works with the old incandecent tye light bulb. It doesn't work with CCFL's or LED type bulbs. The lamp is connected in series on the phase. If the bulb is hooked up in parallel like normal, it will not work as intended either. In order to determent if there still is a short on the primary side of the PSU, did you actually test the output on the secondary to see if there is any voltage coming out?
That little IC is the PWM that connects to the gate drive circuit to the FET. IF the FET was shorted to the gate, then you would have to inspect he gate drive circuit closely and probably replace the PWM. All you can do here is to check all components of the gate drive circuit, check the FET itself, do the lamp test, if there is still a problem, replace the PWM. I use a oscilloscope and a isolation transformer to see if the FET is switching or not. You can check with a DMM if the PWM is getting any power. The PWM also has protection built in, so you'd have to download the spec sheet and measure voltages etc.
The light bulb trick only works with the old incandecent tye light bulb. It doesn't work with CCFL's or LED type bulbs. The lamp is connected in series on the phase. If the bulb is hooked up in parallel like normal, it will not work as intended either. In order to determent if there still is a short on the primary side of the PSU, did you actually test the output on the secondary to see if there is any voltage coming out?
That little IC is the PWM that connects to the gate drive circuit to the FET. IF the FET was shorted to the gate, then you would have to inspect he gate drive circuit closely and probably replace the PWM. All you can do here is to check all components of the gate drive circuit, check the FET itself, do the lamp test, if there is still a problem, replace the PWM. I use a oscilloscope and a isolation transformer to see if the FET is switching or not. You can check with a DMM if the PWM is getting any power. The PWM also has protection built in, so you'd have to download the spec sheet and measure voltages etc.
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