Measuring power panel each output to 0 v to the mainboard external + 5 v power supply. Screen and the normal boot screen. Main circuit. U3fservice manual download site
 U3fservice manual download site
After check the power supply board, found that the damage of components are: power supply module DIP2 (VIPer22A) crack, CCl breakdown, + 5 v (104) rectifier diode (1 n5822) breakdown. U3fservice manual download site
 U3fservice manual download site
After the replacement of the damaged components. Still no output of power supply. Main filter capacitor C3 (47 u F / 400 v) both ends in the case of power cuts are still maintain high voltage. The power does not work. Further examination. Find the switch transformer primary winding open-circuit, remove the check for the inside of a winding break line, because there was no the same model transformer replacement. U3fservice manual download site
 U3fservice manual download site
 U3fservice manual download site
Decided to use rolling F12 DVD power plate overall substitution the machine power supply board. U3fservice manual download site
 U3fservice manual download site
The machine power supply board + 5 v output in the two groups, a group of 12 v and a set of a 12 v voltage. U3fservice manual download site
 U3fservice manual download site
Rowling F12 board just have this several groups of voltage output. The original mechanical and electrical source plate output outlet terminals function is as follows: G, + 5 v, + 5 v, G, G, 12 v, + 12 v. Rowling F12 board is as follows: G, G, + 5 v, + 5 v, G, and 12 v, + 12 v. Are seven terminal socket, plate all marked the corresponding function and parameters. Substitution operation is very simple. Will connect to the motherboard power supply wiring plug pin. Accordingly, according to the order of the new board output socket and connect good mains power input and the power switch connector, finally in the installation position of the original power supply board fixed the new board. Electricity of commissioning, the machine running normally. U3fservice manual download site
 U3fservice manual download site
For damage or hard to find parts under the condition of large area, with the power supply product substitution to the original mechanical and electrical source plate as a whole. Save time and more economic. Users are easy to accept, can yet be regarded as a shortcut.

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