I received my mother board back from TC and all went well. That is until I plugged my audio interface in (I mostly record music with my G5 non-intel iMac). There is a quiet hum now that comes out of my studio monitors. When I use the same audio interface and monitors with my mac book pro the hum is absent. Any ideas?
-
-
Re: Recapping done, now iMac has hummmm
some sort of grounding clip you missed?
ground loop?
hum is ac related so bad grounding,ect is the problem. -
Re: Recapping done, now iMac has hummmm
Hi Yojames
I also have a G5 iMac.
Mine had a lot of bad caps inside the Power Supply.
To disassemble and inspect the PSU you will need a special wrench that's called a "Tamper-Resistant T-10 Torx Driver".
One question: Do the built-in speakers hum or just the external monitor ones?
KeriThe More You Learn The Less You Know!Comment
-
Re: Recapping done, now iMac has hummmm
Try checking if the power cable is OK or securely fitted? My desktop PC has an issue with a cheapo power cable where the earthing pin doesn't always touch the PSU connector and I get this annoying hum going through the speakers which would go away if I shook the power cable. A power cable change solved the problem with the hum.Don't find love, let love find you. That's why its called falling in love, because you don't force yourself to fall, you just fall. - AnonymousComment
-
Re: Recapping done, now iMac has hummmm
Thanks for the responses. I had a new power supply installed just before getting the recapping done. I just tried a different power cable plugged into a different outlet and get the same hum. I also unplugged all other devices from the computer. Perhaps it's my firewire port or something? I imagine I can open it back up and look for some ground that I missed, but I was very careful to reassemble it exactly as I had taken it apart (complete with step by step photos!).Comment
-
Hi guys, I need your help again.
I have this iMac from a customer that shut down during a storm along with all the other devices in the house. In particular, the router, connected via Ethernet to the iMac, caught fire.
When I removed the screen from the iMac to check the status of the LEDs, I noticed that none of them were lit. I had a perfectly compatible and working power supply, so I tried it right away, but the problem remained the same (no LEDs). With the thermal camera, I noticed only a slight warming (32 degrees) of the NCP1605BG chip on the power supply. The rest was completely... -
iMac turns on no drops no cracks, tried to DFU Restore the iMac, logo turns on great! however iMac turns itself off and then restarts to the (!) icon and won't post the restore. Tried thunderbolt 3 cable, tried regular USB C cable and nothing.
this is the message it gives me with the error
Unexpected device state 'DFU' expected 'RestoreOS' (Probably forced into DFU mode externally) [com.apple.MobileDevice.MobileRestore – 0xFAE (4014)].
Any thoughts what this could be? I will open it up and repair it but I am not 100% sure since this iMac doesn't... -
Customer came in for data recovery, came to find out data is soldered on to this iMac (learn something new everyday) this is a 2020 T2 iMac so I was surprised because the iMac Pro has a T2 chip and it isn’t soldered on. Anyways, the iMac boots to Apple logo and then restarts, before it turns off you hear a quarter fan spin then it repeats itself. I decided to do a DFU revive to restore any hardware firmware issues and it was successful in reviving the device however the issue persists in boot looping. It shows the Apple logo for like 40 seconds then turns off and fan spin rinse repeat. I...
-
Hi,
we've got iMac Pro 2017 which having a problem with SSD, iMac come with 2 SSD's 1TB, it was having a problem with the SSD so we get the replacement, installed in and iMac is stuck in recovery mode, tried to restore it & revive, nothing worked - error 4010. After installing old drives now we're having the same problem that the device is in recovery mode. Previously after swap of the SSD iMac worked on the old SSD however after attempt of revive on the new SSD machine stuck in recovery mode, I can go to DFU but the same result with error 4010.
Any ideas what might've... -
Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached....
Comment