TI-83 Buttons not working

On my TI-83, the bottom two rows of keys do not work. I took it apart an did the 'Contact Cleaner' but still no luck. Actually, the bottom rows and the 'trace' 'graph' and 'arrow' buttons do not work. Do I have to replace the entire board?

seandogue8 years ago
Look for broken pcb traces on the board leading tom the affected keys.