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2017 iMac Not Loading Repair Repair in Adelaide - Turning on with forbidden circle sign - https://it-solve.au/repair-cases/2017-imac-not-loading-repair-turning-on-with-forbidden-circle-sign/

Thanks @2informaticos as always straight to the spot. UC resolved the issue. Additionally, reballed UG800 in case, as there was a liquid indication around it.

@Omanyd Just saw your reply here, sorry probably too late now. I have noticed that this model if shut unproperly cycles with no battery connected. Not sure if anybody else experienced it. It goes 0V->5V 0.2A->20 0.1A (for short time) and back to 0V again when board is not connected to battery...

If I get 53V at PPVOUT_LCDBKLT, the boosting of it should be working right?

Replaced LVDS cable to the board, and tested with spare LCD, I can see faint light but no backlight. Heavy oxidation around UP800, QP801; CP951/2/3/7 Melted LP610, replaced. Voltages with connected LCD: PPV5_CAM - 5.17V PPVOUT_LCDBCKLT - 0V FP800 intact, as expected - 12V BKLT_EN_R - 0V...

Unfortunately cannot test with known assembly as I don't have one. Only have 2442 model which is 14" and seems not compatible. I can see the capslock light comes on and off and can hear the chime. The customer mentioned he saw a faint screen (no backlight). I can't see anything. but sometimes...

None of the DFU attempts succeeded. Maybe not DFu issue? What I get now is it goes 20V 2A while charging the battery. Since it's charged it makes the ding noise like charging the Mac and stays at Goes 5V-20V 0.01A and resets the USBc meters, then dign again and repeats 3 times until settles on...

You were right, gunk under the CD3217. Reflowed and came back to life. Thanks again

First time working on 16" 2022 model Might be overlooking something. Suspecting an LCD issue, but to be sure I have disconnected all 3 connectors to the LCD and tried over HDMI. Still no picture. Can hear its chiming as well as capslock response.

Diode mode readings match with slight variations of under 0.1. Other areas to look to?

Fitted a top case from another A2338. Turns on and works, Diagnostic comes with: There might be an issue with the power port PPP001 Failed to push it to DFU restore mode. Have another A2338 here which went into DFu mode. The setup seems to be correct. Just this one doesn't want to enter. Any...

No liquid damage history. The owner is a teenager, so getting any reliable information is a challenge on its own. Battery detected and shows good health, only 3% left, scared that might drain mid-DFU restore. Its the original battery that came with the mac. I will try to source a spare one to...

No shots or liquid on the board CD32s seem fine, with no heat signature.

havent heard of that. Do yu have a link?

No luck in reaching DFU mode. Followed the guide and also tried different macs in case.

No heat signature, dead cold. First connected its power cycles to 20V 0.16A - loads the system, power cycles then repeats. Seems like it cuts off at some point, but can't detect any shorts around CD32s and major lines. liquid impacted areas are: LP800 UG800 UH802/908 U2020 CE501/515 JH500 and...

All in 0.4-0.7 range apart than side grounds, matching a good board

Tried to push to DFU multiple times and not engaging. I can see how the current drops to 0 and back to 0,53 when doing DFu but won't be seen by other device ( via T3 cable which is tested and works. ) Melted connector on the audio board, but same with or without it. Any suggestions?

Yes TPS51393 for sure, but I had one from the donor board, which is the other failed board. So how reliable not sure. And I don't have this chip. I would have thought that 5V and 3.,3 fire separately. Could missing both voltages at the same time would be still faulty TPS51395/3 How can you...

Hi Guys, I know this is an Apple sub, but not sure if you can help me with this one too. I got a schematic and boardview for a close model. location of the parts on the board are a bit shuffled, but schematic ics seem to match. Here link to the Schematic and Boardview - Lenovo FLEX 5-14ALC05 –...