Answer to: MacBook display backlight not coming on. - Help me I'm in agony.I had similar problem. The burned "thing" was resistor underneath the inverter connector. You can check it here: Voltages of pins on logic board where inverter cable hooks up.
Answer to: No backlight after I replaced the screen?Hi, you should check voltages at backlight inverter cable. If you replaced the LCD, then you know it is located at the left side of the logic board. Voltages are: pin1 (right side): 12V, pin2: ground, pin3: 5V, pin4 (left side): 3.3V. This is for early 2008 model (Penryn). Yours may have connector placed with wires coming out from left side. In that case, pin1 is the lowest one. I had similar issue that one of the zero ohm resistors got burned out. You can see that here: Voltages of pins on logic board where inverter cable hooks up.
Answer to: Voltages of pins on logic board where inverter cable hooks up.This question is old, but since I have just had similar issue and repaired it, I feel I must contribute. My MacBook is A1181 Penryn, the inverter is connected via 4-pin connector with the following voltages: pin1 (right side): 12V, pin2 : ground, pin3: 5V, pin4 (left side): 3.3V. You can find full picture of the board here: http://www.google.ba/imgres?imgurl=http:...-macbook-a1181.html&h=861&w=1150&sz=232&tbnid=WQ2...-ZM:&tbnh=132&tbnw=176&zoom=1&usg=__sA7m-vGX3J1pbgLoP--xTmZEQ2g=&docid=1Uf9y9eKbPWS8M&sa=X&ei=F... I had an issue of flickering backlight at certain screen positions. I replaced the inverter cable (one of the wires was pinched, but it was not visible until I removed protective tape). A month after that, the backlight was gone, so I ordered CCFL bulb (with wires already soldered). It was painstaking procedure, this LCD is not designed for bulb replacement, so I wonder that it worked! Anyway, during reassembly and testing, I accidentally shortened board and got a puff of smoke. Laptop worked, but b...