This machine adopts xoceco unit first, Toshiba LSI TA8880CN is used to dealing with lines, signals and light signals. Due to a fault appears dark brightness, color-free, fault should be associated with the main chip TA8880CN. First the N201 (TA8880CN) {5}, {19}, {36}, {50}, {59} foot power source for testing, found {19}, {36}, {50}, {59} pin voltage of 9V to normal, {5} is only 7 feet when the black screen appears. 9V, the image is restored up to 10V. N201{5} pin part of the power supply for the internal line foot, from switching power supply the voltage of 28V, V576 (D400) regulator to get. Normal 28V voltage measured during fault, V576 (D400) c voltage for 24V,b is 10. 5V, while e is only 7. 9V, and V576 plates are burnt yellow, it is clear that its greater power. Replace the V576 and R578 (47 ω/2W) after changing to 160 ω/2W, troubleshooting.