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Questions: 5/11-05.
LCD problem
- The DSUB9 connector to the LCD had a bad connection or short-circuit so I cant get any numbers on the display now (worked well before)
- measure every connection for connectivity. End-to-end measurement is best ( relevant LCD pin to onboard pinheader - or DSUB9 if assembled controller is clamped ).
- document exactly your measurements (using pin numbers, colors, measured resistance). Also, link to docs you used in the first place.
- measure neighboring connections for shortcircuit. Also check againt GND (LCD metallic case)
If you apply some hotmelt after testing (at the DSUB9 and where the wires enter the LCD) and use good clearances, it's unlikely to cause problems later.
Repair display
Would it not be a god start to replace the IC1 with a new IC to fix the display
NO !!! SMD unsoldering is 5 times harder than making a proper LCD cable. Make a proper LCD cable first.
- Get some wired numbers no sense??
- Tried to replace with a new display but same negative result
