Power +B the logging output is normal, modified sampling resistor RP321 knife adjustment regulator, the +B voltage up slowly, can hear sound volume increases gradually, observing the screen brightness and picture has improved, but there is no color, while +B voltage has increased to 140V. Troubleshooting switching power supply-independent, so RP321 back where it was. The next most questionable is the N201 (μ-PC1423CA) is normal, since the chip set video color decoding and signal amplifier, and many other features for the traveling, field scanning in one, machine working properly is crucial. Respectively to measure its {38} and {14} feet foot two sets of supply voltage, find {38} pin voltage normal, and only 6 {14} pin voltage. 5V, turn N480 {3} feet measuring at 6. 5V, but when the {1} table at the foot of a touch screen flashing images and sound back to normal. All this is due to the original N480{1} feet caused by cold solder joint, the whole +12V N480{1}, {3} and powered only by foot and even R482 (47 ω) provided 6. 5V voltage maintenance work. Look bottom N480 is heavily skewed {1} feet front end together with the solder has been extended for printed circuit board, and copper foil is completely out. N480 line side bottom right corner, showing stand installed and repaired easily sliding or flipping floor improper touching. Its Centralizer, weld each foot firmly, and troubleshooting.