A: There are arrows painted behind the led screen light board, and the arrows are generally from left to right from bottom to top. Hold the light board straight in the direction of the arrow. The leftmost chip next to the row of pins is generally 245,2053,2153 and other chips (there are small words on it if you can't see it with a magnifying glass), followed by 138,4953 and other line control chips, and finally the most similar look above is the control lamp bead chip, which is generally 593,62317