TV repair can save a large investment. "Sound but no picture" often means backlight failure—shine a flashlight to confirm. Power board capacitors bulge when failed. HDMI ports can be replaced with soldering skill. Our guides cover Samsung, LG, Sony, TCL, and Vizio. QLED and LED TVs use backlights; OLED panels are different. Always unplug and wait 24 hours for capacitors to discharge. Lay the TV face-down on a soft surface when opening. Panel replacement is expensive—consider if the repair is worth it.