My recently assembled mp3 player fails to function. When powered up without SD card inserted, LCD shows ‘NO SD CARD’ and IC3, p5 is 3v3.
If you then insert the card the LCD still shows ‘NO SD CARD’ but IC3, p5 is now 0v. No other text/characters has ever displayed on the LCD. No response to any switches pressed. Voltages at IC3, pins 2 and 3 change as they should when switches pressed. No leds light. No change when mp3 module removed. When tested without the LCD and J8 connector bridge in place LD4 lights - unchanging.
What might be the problem ?. Checked all soldered joints, etc. Could I, for now, just have a replacement PIC18F26J11 under guarantee, rather than post the unit back?.
Received the replacement microcontroller yesterday (23/05/2012).
Many thanks Velleman. Haven’t tried it yet. Will do within the next few days.
Works ok now with replacement microcontroller. Thanks for that. Expected fast search to be quicker. How long should it take to forward search through, say, 100 tunes?.