The Sunderak 32HD370 is powered on with red light. Press the power button to light the blue light and turn red again. Open the cover, the main board is 3 in 1 PB818, currently used in small brand models. The 12V is normal, and the backlight power supply is also normal. It is suspected that the LED light bar is short-circuited or leaked to cause protection. After the light bar is unplugged, the power is still turned on. It is still the same to remove the keypad. Considering that there is a problem with the motherboard, it is still the same after changing one piece. It seems that the screen is a problem. Unplug the screen and turn it on, the blue light is on, and the backlight is on. Oh, it seems a bit difficult! The side strip and the screen are integrated, the screen strip is shorted.
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The red line of the measuring screen line is connected to the ground, and the digital meter diode block is “å±å±â€, which determines that the screen power supply has a short circuit. See the figure
There is no short circuit to the ground resistance after diode DP4, it seems that the fault range is locked in these components in the red circle. Stupid way, one by one, "severe torture torture", hey, your kid, recruit it!
This diode is broken down and replaced. No short circuit is measured, even the screen line is turned on, everything is normal! Not cleaned, the board is a bit dirty, it will look!
January 30, 2023