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CURRENT DRAW CHECKING
current draw in a bench power supply can be a key diagnostic indicator in laptop motherboard repair. Here’s how I see it:
- Normal vs. Abnormal Current Draw: A healthy motherboard will typically show a stable, expected current draw during different stages of operation. Abnormal readings, however, may point to faults such as short circuits, failed components, or power rail inconsistencies.
- Short Circuits: If the current spikes immediately when power is applied, it often indicates a shorted component or a faulty power rail. This is where methods like resistance testing and thermal cameras can help pinpoint the issue.
- No Current Draw or Very Low Readings: If the bench power supply shows little to no current draw, it could mean an open circuit, missing voltage rails, or a faulty input component like the DC-in MOSFET or protection fuse.
- Fluctuating Current Draw: An unstable, fluctuating draw could signal issues in PWM circuits, faulty capacitors, or even SIO triggering failures disrupting power sequencing.
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