If the MCU doesn’t send any power on signal to power supply or inverters what do you normally do? (sometimes there’s not even remote diode lit on the front TV panel
ANSWER
First, the MCU is programmed to run if it received supply voltage and some important signals like the H/v signals. If the MCU program or the MCU itself have problem, it will not output the on signal. You can either reprogram the MCU (if you have the programmer) or replace with a MCU that already have program in it
Do you suspect MCU to be bad or EEPROM or FLASH memory to be faulty
ANSWER
From experience, it is usually the MCU
Is it best in this case to replace whole main board or something else
ANSWER
If you could get the MCU with the program and is cheaper than the mainboard then replace only the MCU
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