HD4850 LEDs
D1601 - Over temp protection enabled
D1602 - EXT 12V fault
At BOOT/POST, the card's fan will spin @ 100% for a short while, the LEDs will light up for a brief period and then go out. This is NORMAL behaviour as the card is performing it's own type of POST test.
HD4870 LEDs
D1601 - Red LED On, shows critical temperature fault
D1602 - Red LED On, shows External power connector A was removed
D1603 - Red LED On, shows External power connector B was removed
D601 - Red LED On, shows critical Core power fault
At BOOT/POST, the card's fan will spin @ 100% for a short while and 3 of the 4 LEDs will light up for a brief period and then go out ( D601 should remain unlit ). This is NORMAL behaviour as the card is performing it's own type of POST test.
HD4870X2 LEDs
D14 (R753) 6 Pin power unplugged
D13 (R724) 8 Pin power unplugged
D15 (R819) Overheating (Thermal issue)
D5 (R323) GPU-1 (Master) No power
D7 (R570) GPU-2 (Slave) No power
At BOOT/POST, the card's fan will spin @ 100% for a short while, the LEDs will light up for a brief period and then go out. This is NORMAL behaviour as the card is performing it's own type of POST test.
HD4850X2 LEDs
D1601 : ASIC CTF Enable (GPU overheat protection)
D29 : 8 pin external connector no power
D30 : 6 pin external connector no power
D25 : Boot up fault LED (Re-plug the VGA board or D1601,D29,D30 all failed)
D1250~D1252 : Turn on with normal behavior in the left ASIC
D1253~D1255 : Turn on with normal behavior in the right ASIC
At BOOT/POST, the card's fan will spin @ 100% for a short while, the LEDs will light up for a brief period and then go out. This is NORMAL behaviour as the card is performing it's own type of POST test.
Green LEDs lit mean the VGA card is working normally. A RED LED will show on D1250~D1252 / D1253~D1255 to show normal operation.