Broken Fuse of HP Dv1266ea AC Adapter

For this HP Dv1266ea AC adapter, I have dismantled three. I found that it’s usually the problem of the fuse broken. Thus there are different situations about the broken fuse. And I will talk about it below to share with you all.

1. Under normal circumstances the fuse of the HP Dv1266ea AC adapter inside blows, the main reasons: DC filters and transforms oscillation circuit in the high pressure job for long, relatively large voltage change. Reflects: the breakdown diode circuit, high voltage electrolytic capacitor filter is damaged, inverter power switch damaged. The circuit boards should be firstly checked. If not found through above situation, then use the multimeter to measure if the two power switch e, c less than highly resistance between 100kΩ. That will show whether the switch is damaged or not.

2. No DC voltage output or voltage output instability if the fuse was intact, but in a load case, no output DC voltage levels. This is mainly the following reasons: power appears open, short circuit, over voltage, over-current protection circuit failure, the oscillation circuit is not working, power overload, high frequency rectifier diode rectifier filter circuit in the breakdown, filter capacitor leakage, etc.. one of the HP Dv1266ea AC adapter I have examined are due to this situation.

3. No DC output if the power supply inside the fuse blows, the fault may be in the transformer primary winding position before. At this time, the insurance can replace the power-tube experiments. If the AC power source, the insurance management has burned black, the AC input circuit short circuit proof case can bridge rectifier AC input 2 plus insurance management, and directly to the AC power, then connect the power, if regulators normal power supply fan rotation, and testing the DC output voltage normal, then part of the interruption in AC filter circuit.

These are the causes of the broken fuse and how to check the problems. If you are interested in this practical operation, you can have a try under a safe situation. If not, be careful of the electricity. And that is mainly from the experience of the HP Dv1266ea AC adapter.