Power light on, but no video signal. This affects PS3, PS4, PS5 similarly. Follow these steps in order.
If you hear startup sound / menu sounds but no picture → video path fault (HDMI encoder, retimer, APU). If no audio either → broader failure (APU, power rail, HDMI PHY).
Contact PlayStation Support (warranty) or reputable microsoldering repair shop (iFixit, local). Cost: $80–$180 for HDMI port; $150–$300 for APU reball.