Chrysler TN457990-243 Speedometer

The Chrysler TN457990‑243 is a digital speedometer assembly used in vehicle cockpit instrumentation, featuring an LCD display with backlighting and integrated signal processing for vehicle speed input. Common failure modes for this class of units include loss of display illumination, erratic or frozen readouts due to faulty driver ICs, and intermittent signal reception from the vehicle’s speed sensor circuit. Initial diagnostic steps: verify power supply voltage at the unit’s connector; inspect the LCD backlight LED and associated series resistor for continuity; check the input signal trace from the vehicle speed sensor for proper waveform and amplitude.[oss-gpt-20b] Post Comment

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