The is a popular "three-in-one" 4K motherboard used extensively in LCD/LED televisions and even specialized hardware like high-resolution 3D printers.
Press and hold the physical button on the TV chassis, then plug the AC cord back into the wall. tp.ms3458.pc757 service manual
The board converts 12V up to the required panel voltage using a boost controller IC, a MOSFET, and a boost diode. The is a popular "three-in-one" 4K motherboard used
Based on repair logs and forum data, here are the most frequent issues with this board, directly from the service manual’s troubleshooting flowcharts. tp.ms3458.pc757 service manual