Sony KD-43X85K Service Manual page 48

TROUBLESHOOTING
2.2 LED Blinking: 3x (AU ERR)
Audio Amp PVDD voltage check
Measure voltage at capacitor C3576 before 3x blinking.
For Power-Board, if voltage is <12.7V  NG
For Adapter or LD-Board, if voltage is <19.5V  NG
C3576
Audio Amp Fuse check
Measure impedance of fuse at F3551.
F3551 (5A 24V/32V)
If fuse open  NG
Audio Amp 3.3V short check
Measure impedance between 3.3V and GND at C3558.
C3575
If impedance is <100Ω  NG
Audio Amp PVDD short check
Measure impedance between PVDD and GND at capacitor C3575.
If impedance is <100Ω  NG
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SYS SET