Help, My display has completely dimmed but works with external display

g'day, hoping someone one can help me out ,

i woke up one morning and opened my mac-book air and it powered on but the display was a very dim / dark green color , i thought maybe i should plug it into the power supply but when i do it just stays orange and the battery percentage never raises , however i can use with an external display throught the hdmi Cable and its all good, ive ordered an ne I/O board to see if it fixes the supply problem , but im open to advice ...

*Update* the screen is a bit brighter today , not much but enough so i can log in easy and under the right lights ( works fluros) i can us the lap top easy , However , the mag-end of the charger is red hot , the light on it is also more of a Red than an Orange ... thoughts ?