Check the voltage across the LED positive and negative pins. If it's low or unstable, the backlight driver circuit is failing.

The is a popular universal LED TV combo board that integrates the power supply, LED driver, and motherboard into a single unit. It is widely used in 32-inch LED TVs for both manufacturing and repair. Schematic & Technical Data

The main challenge you're facing is that They are considered proprietary intellectual property. This is a common frustration echoed across technical forums.

Measure the voltage on the Power pin; it should drop to 0V momentarily when the button is pressed. If the trigger reaches the SoC but nothing happens, check the crystal oscillator (typically 24MHz) using an oscilloscope to see if the processor is clocking. Symptom 3: Sound Present, No Picture (Screen is Black)

Focus on the "Backlight Enable" (BL_ON) signal coming from the CPU to the LED driver IC. 6. Technical Specifications Summary Main Chipset TSUMV56RUU-Z1 Panel Interface LVDS (Single/Dual 6/8 bit) Max Resolution 1920 x 1080 Input Ports HDMI, VGA, USB (Multimedia), AV, RF Backlight Power 45W Max (Adjustable) Flash Memory 4MB (W25Q32) Finding the PDF