Character display, show CPU characters show circuit working conditions has been met, only horizontal position of the display characters caused by instability. Horizontal display position of the character is determined by the character oscillation circuit, oscillation rates unstable characters may be swayed. Observe the CPU oscillation circuit is only one of the characters introduced foot, 14 foot character filtering end of oscillation, but measuring pin voltage is 2. 7V to normal and stable. Check external RC filtering element, find the R726 (270k) circuit breakers, replace it after troubleshooting.