I agree with Tony Wood , its only bad apple software , ( and a locked donw sytem so its hard to find settings ) even a 1 hour tel contact with a very helpfull Apple support agent did not point me in the right direction :(
what should the output voltages od the led driver board be?
I have 2 boards both give 11.8V
ESPOWER stating Vin 12Vdc 7.2A Vout 42.3VDC this came from a working iMac 27 “ 2010 of which the Videocable connector was damaged by mismanaging the LCD removal (working correctly before)
so I assume this one is defective giving only 11.8V ? or is the backlite switched on by the LCD logic?
The other one:
DARFON HF
4H+V2676.251 /A
backside marked :
cRLus (the caps RL as reversed letters)
E206453
model V267-604
this one from the iMac27” 2011 which I opende because after often suffering from the screenblackouts
when de blackouts started coming 3 sec after startup
I did try all tricks given to resolve the blackout problem , but it keeps coming back :(
Opening my iMac 27 EMC2546 due to a broken display.
It showed me that though iMac are build with will with good parts , Apple surely goes a long way to be extra user unfriendly , like placing the bios battery in such a way, that to replace it is almost as much work as changing a CPU , while it might just as well have been placed somewhere in the memory compartment.
do you have a matrix showing the interconnections , my keyboard duplicates some keys f.i q & p both result in qp with 1 press as welle as some others . I just opened mine and set it to soak in a light detergent , will rinse tomorrow and then wait for drying to test .
what should the output voltages od the led driver board be?
I have 2 boards both give 11.8V
ESPOWER stating Vin 12Vdc 7.2A Vout 42.3VDC this came from a working iMac 27 “ 2010 of which the Videocable connector was damaged by mismanaging the LCD removal (working correctly before)
so I assume this one is defective giving only 11.8V ? or is the backlite switched on by the LCD logic?
The other one:
DARFON HF
4H+V2676.251 /A
backside marked :
cRLus (the caps RL as reversed letters)
E206453
model V267-604
this one from the iMac27” 2011 which I opende because after often suffering from the screenblackouts
when de blackouts started coming 3 sec after startup
I did try all tricks given to resolve the blackout problem , but it keeps coming back :(
I hope to receive some help/advice
bart.koens@gmail.com
Opening my iMac 27 EMC2546 due to a broken display.
It showed me that though iMac are build with will with good parts , Apple surely goes a long way to be extra user unfriendly , like placing the bios battery in such a way, that to replace it is almost as much work as changing a CPU , while it might just as well have been placed somewhere in the memory compartment.
@ Albert Min https://www.ifixit.com/User/3139679/Albe...
do you have a matrix showing the interconnections , my keyboard duplicates some keys f.i q & p both result in qp with 1 press as welle as some others . I just opened mine and set it to soak in a light detergent , will rinse tomorrow and then wait for drying to test .
bart