Chosen Solution
HI, could someone tell me where I can find pinout for espower pwb-iv49151t inverter board please ? I need to test it as I’ve just receive replacement screen for my iMac and it’s still dead. symptoms : -4th diagnostic led not on. -when dp ribbon disconnected the fans go full blast. -when all the cables are connected the internal screen is discovered as online by system info and starts with internal as main screen (4th led still off). -when disconnected from inverter board screen is not discovered. the Mac works fine with external display. if anyone have any suggestions I’ll be forever grateful. Seb
Ok, so after bit more testing it turned out that the problem was onboard DP connector, all working as intended now.
LED 4 - Indicates that the computer and the LCD display panel are communicating. This LED will be ON when the computer is turned on and video signal is being generated. If the LED is ON and there is no image on the LCD display panel, the LCD display panel or LED driver board might be installed incorrectly or need replacement. iMac Intel 21.5" EMC 2428 LED Driver Board Replacement
