Hi everyone
Thanks for the interesting forum.
Can anyone help me identifying a burnt out diode?
Here is the story thus far.....
iMac would not power up. The On Off LED in button just cycles on and off. Taken to Apple Repair Centre. Swollen caps replaced with new Rubycon MCZ series. This was done under Apple's extended warranty for this problem.
Then 3 months later the iMac again would not power up. On Off LED in button just cycles on and off.
I took it again to the Apple repairer to be told unfortunately the unit was not covered by Apple Care and therefore would not be fixed. I must admit to feeling a bit cheated as this is the same symptom that happened prior to the caps being replaced the first time.
While checking voltages around the PCB I noted that D902 is completely crisped. D900 is just above it and is marked B2Z. Does anyone know this diode's specification? I am not familiar with this type of diode marking.
Does anyone know if D902 would be the same as D900?
These components are just to the right of U2900
My next step will be to try and troubleshoot why this component failed.
The Logic PCB has the following markings:
W85039HQRBYY
1.8GHz 567856
An additional number on the PCB is 820–1540-A
Thanks for any assistance.
Chris
Thanks for the interesting forum.
Can anyone help me identifying a burnt out diode?
Here is the story thus far.....
iMac would not power up. The On Off LED in button just cycles on and off. Taken to Apple Repair Centre. Swollen caps replaced with new Rubycon MCZ series. This was done under Apple's extended warranty for this problem.
Then 3 months later the iMac again would not power up. On Off LED in button just cycles on and off.
I took it again to the Apple repairer to be told unfortunately the unit was not covered by Apple Care and therefore would not be fixed. I must admit to feeling a bit cheated as this is the same symptom that happened prior to the caps being replaced the first time.
While checking voltages around the PCB I noted that D902 is completely crisped. D900 is just above it and is marked B2Z. Does anyone know this diode's specification? I am not familiar with this type of diode marking.
Does anyone know if D902 would be the same as D900?
These components are just to the right of U2900
My next step will be to try and troubleshoot why this component failed.
The Logic PCB has the following markings:
W85039HQRBYY
1.8GHz 567856
An additional number on the PCB is 820–1540-A
Thanks for any assistance.
Chris
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