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== Common Faults (SMS II) == * '''No RF / distorted video''' โ cracked solder on CXA1145 or corroded RF shield. * '''Low audio volume / buzzing''' โ dried C31 10 ยตF coupling cap (VA1). * '''Power LED flicker''' โ 5 V rail ripple; replace 2200 ยตF filter cap (C8). * '''Controller port failures''' โ broken traces to 315-5237 I/O decoder. Detailed procedures: [[Sega Master System II Troubleshooting Guide|Master System II Troubleshooting Guide]] & [[Sega Master System II Capacitor Replacement Guide|Master System II Capacitor Replacement Guide]].
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