The Panasonic TC-21RX20C circuit diagram PDF is an indispensable tool for repair technicians. While not beginner-friendly, it is accurate and comprehensive when you obtain a clean scan. For anyone restoring this 20+ year-old TV, do not attempt major repairs without it —the cost (free) vs. benefit (avoiding cascade failures from guessed parts) is immense.
: In the GP41 chassis series, check the vertical output IC (often LA78040) and electrolytic capacitors in the power supply if you experience a "single horizontal line" or power-on failure. panasonic tc-21rx20c circuit diagram pdf