crwdns2933423:0crwdne2933423:0
crwdns2918538:0crwdne2918538:0

crwdns2934243:0crwdne2934243:0 Cory

crwdns2947189:0crwdne2947189:0:

What are the 5 diagnostic LEDs?

crwdns2934249:0crwdne2934249:0:

I had a power surge at home while I was at work, when I got home my iMac was off. It now has a black screen when I tried to power it up, so after removing the display I noticed the bottom two LEDs are lit, while the top three are not. I tried to find info on what the LEDs mean and everyone else has 4 LEDs, this model has 5 and cannot find that info anywhere. Any help would be great, the logic board was replaced once before so I would like to attempt fixing it myself once I figure out what is really going on. I have class 3 solder cert. and am confident in my skills, if they are needed.

also I would like to add that this is a replacement logic board, I had this iMac for 13 months (1 month out of Apple care) and it went into a boot loop, which could not be recovered in any way, it wouldn’t even go into internet recovery. After arguing with head of support at Apple  they refused to even touch the machine because they did “not have the parts to replace it.” I was even prepared to pay the cost just to get it working again. I was extremely upset that they refused to help. Support told me to replace the logic board myself so I did and everything went very smoothly, I have had experience in replacing these so I was not afraid of the challenge… another two months went by with normal operation and then a severe storm caused a surge, which I imagine must have either fried the GPU or cracked a solder joint.

i am debating whether or not to bake the original logic board in hopes that it fixes the strange boot loop. But as of right now it’s a 1400$ paper weight

crwdns2866306:0crwdne2866306:0:

iMac Intel 21.5" Retina 4K Display (2017)

crwdns2915684:0crwdne2915684:0:

open

crwdns2934251:0crwdne2934251:0:

+628368

crwdns2934245:0crwdne2934245:0 Cory

crwdns2947189:0crwdne2947189:0:

What are the 5 diagnostic LEDs?

crwdns2934249:0crwdne2934249:0:

-I had a power surge at home while I was at work, when I got home my iMac was off. It now has a black screen if I tried to power it up so after removing the display I noticed the bottom two LEDs are lit, while the top three are not. I tried to find info on which LEDs mean and everyone else has 4 LEDs, this model has 5 and cannot find that info anywhere. Any help would be great, the logic board was replaced once before so I would like to attempt fixing it myself once I figure out what is really going on. I have class 3 solder cert. and am confident in my skills, if they are needed.
+I had a power surge at home while I was at work, when I got home my iMac was off. It now has a black screen when I tried to power it up, so after removing the display I noticed the bottom two LEDs are lit, while the top three are not. I tried to find info on what the LEDs mean and everyone else has 4 LEDs, this model has 5 and cannot find that info anywhere. Any help would be great, the logic board was replaced once before so I would like to attempt fixing it myself once I figure out what is really going on. I have class 3 solder cert. and am confident in my skills, if they are needed.
-also I would like to add that this is a replacement logic board, I had this iMac for 13 months (1month out of Apple care) and it went into a boot loop, which could not be recovered in a any way… after arguing with head of support at Apple they refused to even touch the machine because they did “not have the parts to replace it.” I was extremely upset that they refused to help. Support told me to replace the logic board myself so I did and everything went very smoothly, another two months went by with normal operation and then a severe storm caused a surge, which I imagine must have either fried the GPU or cracked a solder joint.
-
-
+also I would like to add that this is a replacement logic board, I had this iMac for 13 months (1 month out of Apple care) and it went into a boot loop, which could not be recovered in any way, it wouldn’t even go into internet recovery. After arguing with head of support at Apple they refused to even touch the machine because they did “not have the parts to replace it.” I was even prepared to pay the cost just to get it working again. I was extremely upset that they refused to help. Support told me to replace the logic board myself so I did and everything went very smoothly, I have had experience in replacing these so I was not afraid of the challenge… another two months went by with normal operation and then a severe storm caused a surge, which I imagine must have either fried the GPU or cracked a solder joint.
i am debating whether or not to bake the original logic board in hopes that it fixes the strange boot loop. But as of right now it’s a 1400$ paper weight

crwdns2866306:0crwdne2866306:0:

iMac Intel 21.5" Retina 4K Display (2017)

crwdns2915684:0crwdne2915684:0:

open

crwdns2934245:0crwdne2934245:0 Cory

crwdns2947189:0crwdne2947189:0:

What are the 5 diagnostic LEDs?

crwdns2934249:0crwdne2934249:0:

I had a power surge at home while I was at work, when I got home my iMac was off. It now has a black screen if I tried to power it up so after removing the display I noticed the bottom two LEDs are lit, while the top three are not. I tried to find info on which LEDs mean and everyone else has 4 LEDs, this model has 5 and cannot find that info anywhere. Any help would be great, the logic board was replaced once before so I would like to attempt fixing it myself once I figure out what is really going on. I have class 3 solder cert. and am confident in my skills, if they are needed.
+
+also I would like to add that this is a replacement logic board, I had this iMac for 13 months (1month out of Apple care) and it went into a boot loop, which could not be recovered in a any way… after arguing with head of support at Apple they refused to even touch the machine because they did “not have the parts to replace it.” I was extremely upset that they refused to help. Support told me to replace the logic board myself so I did and everything went very smoothly, another two months went by with normal operation and then a severe storm caused a surge, which I imagine must have either fried the GPU or cracked a solder joint.
-also I would like to add that this is a replacement logic board, I had this iMac for 13 months (1month out of Apple care) and it went into a boot loop, after arguing with head of support they refused to even touch the machine because they did not have the parts to replace it. I was extremely upset that they refused to help. Support told me to replace the logic board myself so I did and everything went very smoothly, another two months went by with normal operation and then a severe storm caused a surge, which I imagine must have either fried the GPU or cracked a solder joint.
+i am debating whether or not to bake the original logic board in hopes that it fixes the strange boot loop. But as of right now it’s a 1400$ paper weight

crwdns2866306:0crwdne2866306:0:

iMac Intel 21.5" Retina 4K Display (2017)

crwdns2915684:0crwdne2915684:0:

open

crwdns2934245:0crwdne2934245:0 Cory

crwdns2947189:0crwdne2947189:0:

What are the 5 diagnostic LEDs?

crwdns2934249:0crwdne2934249:0:

I had a power surge at home while I was at work, when I got home my iMac was off. It now has a black screen if I tried to power it up so after removing the display I noticed the bottom two LEDs are lit, while the top three are not. I tried to find info on which LEDs mean and everyone else has 4 LEDs, this model has 5 and cannot find that info anywhere. Any help would be great, the logic board was replaced once before so I would like to attempt fixing it myself once I figure out what is really going on. I have class 3 solder cert. and am confident in my skills, if they are needed.
+
+
+
+also I would like to add that this is a replacement logic board, I had this iMac for 13 months (1month out of Apple care) and it went into a boot loop, after arguing with head of support they refused to even touch the machine because they did not have the parts to replace it. I was extremely upset that they refused to help. Support told me to replace the logic board myself so I did and everything went very smoothly, another two months went by with normal operation and then a severe storm caused a surge, which I imagine must have either fried the GPU or cracked a solder joint.

crwdns2866306:0crwdne2866306:0:

iMac Intel 21.5" Retina 4K Display (2017)

crwdns2915684:0crwdne2915684:0:

open

crwdns2934241:0crwdne2934241:0 Cory

crwdns2947189:0crwdne2947189:0:

What are the 5 diagnostic LEDs?

crwdns2934249:0crwdne2934249:0:

I had a power surge at home while I was at work, when I got home my iMac was off. It now has a black screen if I tried to power it up so after removing the display I noticed the bottom two LEDs are lit, while the top three are not. I tried to find info on which LEDs mean and everyone else has 4 LEDs, this model has 5 and cannot find that info anywhere. Any help would be great, the logic board was replaced once before so I would like to attempt fixing it myself once I figure out what is really going on. I have class 3 solder cert. and am confident in my skills, if they are needed.

crwdns2866306:0crwdne2866306:0:

iMac Intel 21.5" Retina 4K Display (2017)

crwdns2915684:0crwdne2915684:0:

open