Between 50 and 100 yuan.
The Apple 4 is so old that it's barely worth repairing. If the iPhone 4 is an old phone, the average value of a chip is between 5 and 50 yuan. The price of electronic components inside Apple 4 is not expensive, its most valuable chip is Apple's own CPU, which can generally reach 50 to 100 yuan, other chips are usually cheaper, ranging from a few dollars to dozens of dollars, on average.