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The majority of these LCDs have problems with the power supply. Once the power supply is fix, the LCD should work.
I've repaired a few of these power supplies, if you need more info you can email firstname.lastname@example.org
I will say that the part that you bought could have been removed from another LCD and it might not be working properly due to components that become defective when they overheat.
It looks like there are not service parts or they are difficult to find.
Most power supplies I've repaired have components that failed after about 1500 hours of use.
The only way to get the LCD working is to repair the power supply to the component level instead of swapping it.
In about 95% of the time the power board is defective.
Let me know if you need further assistance.
The MLT169A is a version number issued by MegaMeet in asia who built the supply. The correct part number for the SMPS for that unit is: E7802-005008 and unfortunately they are no longer available... However, there is some good news, those supplies can usually be rebuilt but you need to have the equipment, knowledge to make the repair...