Tp.ms3458.pc757 Service Manual Review

Should read 300V to 340V DC across its terminals. If 0V, check the main fuse, bridge rectifier, and thermistor. Secondary Side (Low Voltage Regulations)

Generated by a synchronous step-down (buck) regulator to power USB ports and standby logic. Test Point: Inductor marked near the USB array.

Open Circuit (Burnt LEDs): Voltage spikes very high (接近 OVP - Over Voltage Protection limit) and then immediately drops back down to the 12V or 24V feed voltage.

Check the boost MOSFET, the freewheeling diode, and the electrolytic output filter capacitors.

The primary side of this board stores up to 400V DC. Unplug the AC cord and safely discharge the main filter capacitor using a high-wattage resistor before touching any components. tp.ms3458.pc757 service manual

Clear images of both the top and bottom sides of the board.

If the TV works but HDMI ports are dead, this often indicates a damaged HDMI IC or surge damage.

Set this parameter to Direct or ON so that the television automatically Powers Up whenever AC power is restored, bypassing the manual standby step.

The TP.MS3458.PC757 Go to product viewer dialog for this item. Should read 300V to 340V DC across its terminals

The Service Menu allows you to change the TV's core configuration. Use it with care and before making any changes.

~310V DC (Caution: High voltage!). If 0V, check the main fuse and bridge rectifier.

If blown, check the bridge rectifier diodes and the primary switching MOSFET for shorts.

Video functions perfectly, but there is complete silence or severe cracking from the speakers. Test Point: Inductor marked near the USB array

The is a widely used, high-efficiency "three-in-one" (3-in-1) television motherboard found across various budget and mid-tier 4K Ultra HD LCD/LED TVs. It consolidates the main signal processor, power supply unit (PSU), and LED backlight driver onto a single printed circuit board (PCB). This integrated design saves manufacturing space but requires precise troubleshooting when a failure occurs.

Step down transformer voltage into +12V (Main system rail) and +100V to +160V (Backlight rail, depending on screen configuration).

You can lower the maximum backlight current percentage here (e.g., change from 100% to 70%). This reduces panel heat and extends the lifespan of the LED strips significantly. 6. Safety Warnings