Tips and tricks this time, we discuss how to fix Sharp TV protection mode. First, clean the mainboard with thinner to ensure all solder points are visible. Check the supply, flyback, vertical, and regulator sections, as heat often causes solder joints to crack. Also, check the vertical IC and associated resistors.
Troubleshooting Steps:
1. Red LED to Yellow-Green
If the LED changes to yellow-green and stops, the memory IC (24C04/24C16) is likely damaged. Replace it and reset the parameters in the service menu.
2. Red LED stays on (Dead)
If the red LED stays on, check the main IC (TDA 938psxxx) or check for a loss of 3.3V at the regulator. Inspect the power supply section.
3. Green or Red blinking
This indicates an internal memory IC error. You can try to reset the memory IC or replace it entirely.
4. Green for 5-10 seconds, then Red
This is a failure in the horizontal section. Check the FBT (Flyback) using a multimeter (10k scale) between ground and the horizontal output transistor collector. If it moves, the FBT is shorted. Also, check the 180V line to the RGB block; a limiting resistor may be damaged.
5. LED not lit at all
Check the power supply input section. If using STR 6553/6554, check for signs of damage and replace the limiting resistor (6.8Ω/10W). When replacing the STR IC, check all diodes—especially the two diodes in the corner—and use genuine parts, as imitation components often fail quickly.
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