Customer Problem
XEB510EN remote PCB: The last button shows no LED flash and no vehicle response. They suspect the whole board or MCU may be defective and ask whether complete replacement is required.
Initial Checks (Power & Appearance)
Measure battery voltage (ensure it meets spec, e.g. ≥3.0 V if CR2032 fresh)
Inspect battery holder/spring contacts for oxidation or looseness
Check shell deformation that could mechanically stress one button
Findings here: Battery OK. All other buttons feel normal. Fault is isolated to the last button only.
Using VVDI Key Tool Max for Button vs RF Comparison
Procedure: Press each button while watching the frequency detection screen.
Result (normal buttons): Stable FSK output (example: 315.02 MHz) appears for the working buttons, proving:
RF transmitter chain is good
MCU logic/encoding is fine
Power circuit is stable
Faulty button: No LED flash, no RF line appears. This strongly shifts suspicion to a local hardware issue (switch / solder) rather than MCU or coding.
Diagnosis: Remote MCU and RF system are normal. Only the last button’s tactile switch/solder joint failed. We repaired (Re-soldered/Replaced) it. All buttons now transmit proper FSK 315 MHz signals. No full remote replacement required.
