Summary of "ซ่อมสว่านไร้สาย MISAKA แบตเตอรี่เต็ม กดสวิตซ์ไฟติด แต่ไม่หมุน เครื่องไม่ทำงาน"

Video subject

Repair walkthrough of a MISAKA cordless drill that shows the battery full and LED on but the motor does not spin.

Symptom: battery fully charged, LED indicator lights when trigger pressed, but drill motor is silent / no rotation.

Batteries tested: original and a second battery (one needed charging). Problem persisted with a fully charged spare, so the battery was unlikely the cause.
Visual inspection after opening found wiring possibly pinched under a screw/head and concerns about the switch/driver circuitry.
Technician’s diagnosis: failure of the driver (motor control) circuit board / switch assembly (a common failure). The motor and gears appeared intact.

Disassembly
- Removed many Torx/star-head screws (star size ≈ T10).
- Removed metal backing plate, plastic covers, and pried off bearing covers.
- Photographed parts during disassembly to avoid mistakes during reassembly.
Inspection and part replacement
- Inspected wiring and motor assembly; removed the integrated switch/driver module from the case.
- Ordered and installed a replacement driver kit (included driver circuit board, battery terminals, switch assembly).
- Rewired the motor by moving three motor wires (red, yellow, blue) to the new driver board and soldered terminals.
Reassembly and testing
- Ensured wires sat in grooves and were not pinched; verified correct orientation of the red plastic locking piece and switch housing.
- Tested with fully charged batteries — drill function restored.

Tools and techniques:

Battery: ~21 V model; note that battery interface grooves/fins can differ slightly between production versions.
Original switch spec mentioned as 36 V DC, 0.2 A; replacement switch spec mentioned as 36 V, 20 mA (transcript may contain numeric inaccuracies).
Replacement driver kit bought online; included switch and battery terminals, plus the driver circuit board.

After installing the replacement driver/switch, the drill worked normally with multiple batteries.
Conclusion: the failure was caused by a faulty driver circuit (not the battery or motor/gears).
Repair is feasible at home if you can solder and follow wiring/assembly precautions; replacement parts are available online.

Fault isolated to a replaceable driver board.
Replacement driver kits (including switch & terminals) are readily available online.
Motor and mechanical parts were fine; no major mechanical rebuild required.
Clear step-by-step visual procedure shown — useful for DIYers.

Driver circuit failure is a relatively common problem for this model.
Disassembly requires many screws and the correct Torx/star screwdriver sizes.
Risk of pinching wires or misplacing parts during reassembly — taking photos is recommended.
Some parts or battery locks/grooves may differ between production versions — check fitment.
Soldering skill required for secure terminal/wire work.
Potential mismatch of switch ratings if using non-original parts (transcript numbers uncertain).

Repairer compared original vs replacement switch specs and suggested the original is preferable, but the replacement was compatible.
Mentioned general differences between brushed vs brushless motors when explaining driver function (this was speculative in the transcript).
Driver board and switch are integrated in many models — a common repair pattern across similar cordless drills.

Verdict: The drill was successfully repaired by replacing the driver circuit/switch assembly.
Recommendation: If your cordless drill shows the LED indicator but the motor is dead, check the driver/switch board before replacing the battery or motor. Order the correct driver kit for your model and follow careful reassembly procedures (document steps, avoid pinching wires, ensure correct wiring order).

Symptom: battery full, LED lights, motor does not spin.
Try multiple batteries first.
Prepare Torx/star drivers and a soldering iron.
Take photos during teardown.
Inspect wiring routing for pinched wires or screws.
Replace driver/switch assembly if suspected faulty; rewire red/yellow/blue motor wires to the new board and solder.
Ensure proper fit of battery housing/grooves between versions.
Test with fully charged batteries.

Owner: reported the problem (drill dead though battery full, LED lights).
Repairer / presenter: diagnosed the issue, performed teardown, ordered and installed the replacement driver kit, provided reassembly tips, and confirmed successful repair.