Surprised to see the scematic out there. Symptom: works for a few minutes then backlight starts dipping out, exactly every second , no audio out, random letters, (not segments) disappear from the display and no response to any buttons. So far found 5V, +\- 15V and are stable but not delved further into the digital board or other TO220 devices. Corrupted memory? insulated touching of digital chippery makes no difference.
- posted
9 years ago