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Version actuelle par : Jordan ,

Titre:

Display not working after SSD swap...VFD001 and PFM006, no LED 4.

Texte:

I swapped my HDD for an SSD and in the process of reconnecting the display cable (LVDS?), unbeknownst to me, I skewered the corner of the cable pins on the logic board end when fitting it in - one of the pins snapped off. Tried to fire it up, and it did, but no display (not a backlight issue) and a fast fan. Took it apart and that’s when I noticed the cable was bad…
Got a new cable from eBay, replaced it, still no 4th LED or display.. Ran diagnostics and get vfd001 and pfm006. External monitor works fine. The fan runs fast, the system is sluggish, and the CPU runs at 70% with a high kernel rate of 200-300% (I don’t know WHAT that means, I just know how to find the stuff in the activity monitor and google…). I saw one post about bypassing the SMC to kick the kernel issue (unplug from wall, press power for 10seconds, plug in, and then press power again), which it worked and everything was SSD fast (at least something was working!) but of course the fan was going even faster then and still no display (only external works).
-From what I can tell, there are no bad fuses/connections on the top side of the logic board as nothing looks burnt. I don’t know what the back side looks like on the logic board as I didn’t have time to take the whole thing apart, since that’s a bigger time commitment than I have right now.
+From what I can tell, there are no bad fuses/connections on either side of the board.
-Are there possible shorts on the back of the board that could be related to this? Or something on the power board? Are there any other SMC reset tricks or ways to know if the actual SMC chip is bad? If the new cable I got were coincidentally bad, could that be tripping the SMC code and the display code? Or are there 2 separate issues to fix?
+Are there any other SMC reset tricks or ways to know if the actual SMC chip is bad?
Thanks for any possible insights!
-EDIT: Tested a new lvds cable and no change. I’m leaning towards a bad SMC chip or resistor somewhere that I can’t see, probably going to have to sell the computer for parts…I don’t have the resources to get a new SMC chip soldered in.
+EDIT: Tested 3 new lvds cables and no change. I’m leaning towards a bad SMC chip or resistor somewhere that I can’t see.
=== Update (01/28/2020) ===
-Here are some snapshots of the stat sensors that I realized I could get and possibly relate to an issue on the board. Notice that there are multiple sensors with no reading (including the LCD one…). Could anyone tell me where each of these are to confirm connection/look closer at?
+Here is a snapshot of the stat sensors that I realized I could get and possibly relate to an issue on the board. Notice that there are multiple sensors with no reading (including the LCD one…). Could anyone tell me where each of these are to confirm connection/look closer at?
-BLC Proximity
-LCD (I know this is the one on the back of the LCD near the LVDS cable)
-Logic board DIMM Local Board
- Logic board proximity
-SO-DIMM Proximity
-Timing Controller
-Also, I see the GPU has no power consumption…that can’t be good for this issue, can it?
+I see the GPU has no power consumption listed, it’s just 0.00…that can’t be good for this issue, can it? Or does it only process if it’s actually got a place to send power (e.g., a properly connected display?)
[image|1985756]
-
-[image|1985751]

Appareil:

iMac Intel 21.5" EMC 2638

Statut:

open

Modifié par : Jordan ,

Titre:

Display not working after SSD swap...VFD001 and PFM006, no LED 4.

Texte:

I swapped my HDD for an SSD and in the process of reconnecting the display cable (LVDS?), unbeknownst to me, I skewered the corner of the cable pins on the logic board end when fitting it in - one of the pins snapped off. Tried to fire it up, and it did, but no display (not a backlight issue) and a fast fan. Took it apart and that’s when I noticed the cable was bad…
Got a new cable from eBay, replaced it, still no 4th LED or display.. Ran diagnostics and get vfd001 and pfm006. External monitor works fine. The fan runs fast, the system is sluggish, and the CPU runs at 70% with a high kernel rate of 200-300% (I don’t know WHAT that means, I just know how to find the stuff in the activity monitor and google…). I saw one post about bypassing the SMC to kick the kernel issue (unplug from wall, press power for 10seconds, plug in, and then press power again), which it worked and everything was SSD fast (at least something was working!) but of course the fan was going even faster then and still no display (only external works).
From what I can tell, there are no bad fuses/connections on the top side of the logic board as nothing looks burnt. I don’t know what the back side looks like on the logic board as I didn’t have time to take the whole thing apart, since that’s a bigger time commitment than I have right now.
Are there possible shorts on the back of the board that could be related to this? Or something on the power board? Are there any other SMC reset tricks or ways to know if the actual SMC chip is bad? If the new cable I got were coincidentally bad, could that be tripping the SMC code and the display code? Or are there 2 separate issues to fix?
Thanks for any possible insights!
+EDIT: Tested a new lvds cable and no change. I’m leaning towards a bad SMC chip or resistor somewhere that I can’t see, probably going to have to sell the computer for parts…I don’t have the resources to get a new SMC chip soldered in.
+=== Update (01/28/2020) ===
+Here are some snapshots of the stat sensors that I realized I could get and possibly relate to an issue on the board. Notice that there are multiple sensors with no reading (including the LCD one…). Could anyone tell me where each of these are to confirm connection/look closer at?
-EDIT: Tested a new lvds cable and no change. I’m leaning towards a bad SMC chip or resistor somewhere that I can’t see, probably going to have to sell the computer for parts…I don’t have the resources to get a new SMC chip soldered in.
+-BLC Proximity
+
+-LCD (I know this is the one on the back of the LCD near the LVDS cable)
+
+-Logic board DIMM Local Board
+
+- Logic board proximity
+
+-SO-DIMM Proximity
+
+-Timing Controller
+
+Also, I see the GPU has no power consumption…that can’t be good for this issue, can it?
+
+[image|1985756]
+
+[image|1985751]

Appareil:

iMac Intel 21.5" EMC 2638

Statut:

open

Modifié par : Jordan ,

Titre:

-Display not working after SSD swap...VFD001 and PFD006, no LED 4.
+Display not working after SSD swap...VFD001 and PFM006, no LED 4.

Texte:

I swapped my HDD for an SSD and in the process of reconnecting the display cable (LVDS?), unbeknownst to me, I skewered the corner of the cable pins on the logic board end when fitting it in - one of the pins snapped off. Tried to fire it up, and it did, but no display (not a backlight issue) and a fast fan. Took it apart and that’s when I noticed the cable was bad…
Got a new cable from eBay, replaced it, still no 4th LED or display.. Ran diagnostics and get vfd001 and pfm006. External monitor works fine. The fan runs fast, the system is sluggish, and the CPU runs at 70% with a high kernel rate of 200-300% (I don’t know WHAT that means, I just know how to find the stuff in the activity monitor and google…). I saw one post about bypassing the SMC to kick the kernel issue (unplug from wall, press power for 10seconds, plug in, and then press power again), which it worked and everything was SSD fast (at least something was working!) but of course the fan was going even faster then and still no display (only external works).
From what I can tell, there are no bad fuses/connections on the top side of the logic board as nothing looks burnt. I don’t know what the back side looks like on the logic board as I didn’t have time to take the whole thing apart, since that’s a bigger time commitment than I have right now.
-Are there possible shorts on the back that could be related to this job? Or something on the power board? Are there any other SMC reset tricks or ways to know if the actual SMC chip is bad? If the new cable I got were coincidentally bad, could that be tripping the SMC code and the display code? Or are there 2 separate issues to fix?
+Are there possible shorts on the back of the board that could be related to this? Or something on the power board? Are there any other SMC reset tricks or ways to know if the actual SMC chip is bad? If the new cable I got were coincidentally bad, could that be tripping the SMC code and the display code? Or are there 2 separate issues to fix?
Thanks for any possible insights!
+
+
+
+EDIT: Tested a new lvds cable and no change. I’m leaning towards a bad SMC chip or resistor somewhere that I can’t see, probably going to have to sell the computer for parts…I don’t have the resources to get a new SMC chip soldered in.

Appareil:

iMac Intel 21.5" EMC 2638

Statut:

open

Contribution d'origine par : Jordan ,

Titre:

Display not working after SSD swap...VFD001 and PFD006, no LED 4.

Texte:

I swapped my HDD for an SSD and in the process of reconnecting the display cable (LVDS?), unbeknownst to me, I skewered the corner of the cable pins on the logic board end when fitting it in - one of the pins snapped off.  Tried to fire it up, and it did, but no display (not a backlight issue) and a fast fan.  Took it apart and that’s when I noticed the cable was bad…

Got a new cable from eBay, replaced it, still no 4th LED or display..  Ran diagnostics and get vfd001 and pfm006.  External monitor works fine.  The fan runs fast, the system is sluggish, and the CPU runs at 70% with a high kernel rate  of 200-300% (I don’t know WHAT that means, I just know how to find the stuff in the activity monitor and google…).  I saw one post about bypassing the SMC to kick the kernel issue (unplug from wall, press power for 10seconds, plug in, and then press power again), which it worked and everything was SSD fast (at least something was working!) but of course the fan was going even faster then and still no display (only external works).

From what I can tell, there are no bad fuses/connections on the top side of the logic board as nothing looks burnt.  I don’t know what the back side looks like on the logic board as I didn’t have time to take the whole thing apart, since that’s a bigger time commitment than I have right now.

Are there possible shorts on the back that could be related to this job?  Or something on the power board? Are there any other SMC reset tricks or ways to know if the actual SMC chip is bad?  If the new cable I got were coincidentally bad, could that be tripping the SMC code and the display code?  Or are there 2 separate issues to fix?

Thanks for any possible insights!

Appareil:

iMac Intel 21.5" EMC 2638

Statut:

open