Hi, I am missing this power rail PP5V_S4RS3 on MacBook Air A1466 board # 820-00165-A. PP5V_S5 is present & 3.3v is present too. No liquid spill & very clean. The Magsafe LED turn to orange but no fan spin & cannot turn on. Can anyone help in this repairs. Mainly 5V rail is missing.
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Re: Missing PP5V_S4RS3 on 820-00165-A
https://logi.wiki/index.php/G3_to_S3..._and_Broadwell
https://logi.wiki/index.php/User:Pie....2C_what_do.3FOpenBoardView — https://github.com/OpenBoardView/OpenBoardView -
Re: Missing PP5V_S4RS3 on 820-00165-A
Thank you very much... will try to repair systematicallyComment
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Re: Missing PP5V_S4RS3 on 820-00165-A
On the U7501 I am getting the Enable P3V3S5_EN_R of 3.3 volt but NO Enable P5VS4RS3_EN_R of 5 volts. I get 0 volts out here whereas it should be 3.4V if I am correct. P5VS4RS3_EN comes out from S4_PWR_EN & PM_SLP_S4_L ... I am missing PM_SLP_S4_L too, 0 volts out here... Where can the problem be????Comment
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Re: Missing PP5V_S4RS3 on 820-00165-A
PM_SLP_S4_L is pretty critical. Refer to Piernov's link above for the flow chart for the pre-requisites to get that signal.
But since you are dealing with a 820-00165 board, check to see if you are getting life on the other rails when you initially supply power. These boards have a thing where they will power on all rails right up to CPU Vcore, shut down, start again, then just shut off. You'll only see this behaviour when you first connect the magsafe.Comment
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Hi, I'm Daniel, and I'm new to the world of repairing motherboards.
I would like to create a table, or more likely a guideline about the voltage rails and their possible resistance rail.
I know that the motherboard design has a very big depend on the rail's resistance, but I would like to know what is the smallest value for a rail that can be acceptable. For example, I heard that some new gaming motherboards can have 0,5 Ohm resistance on the GPU rail, but on an older type, it could be a sign of a shorted GPU rail.
So, I generated a table with AI so I can... -
Sub: Missing enable on +5v sec pwr rail AMD Firepro D500-B/Mac Pro late 2013
Ref: 1/ MacPro6,1 Late 2013/A1481 MD878LL/A (3.5 GHz 6 Core Xeon E5-1650v2)
Gfx-B: APN: 661-7548 PPN: 820-3533-A AMD FirePro D500-B 3GB Vmem
2/ Figure 1 Gfx-D500-B Front Facing
3/ Figure 2 +5v supply (zoom-in)
Intro:
While troubleshooting a Mac Pro(6,1) referenced above I discovered the +5v secondary supply did not stand up on the D500-B graphics card as a result of a missing enable signal. The +3.3v secondary rail was the only rail that did standup. I tried to perform...12-07-2023, 09:55 PM -
Hello everyone, i have zotac gtx 1060 3gb, and it has missing one rail. I think its 1v but I'm not sure. This rail has 34 Ohms, but after test on on my testbench, it drops to 2ohm, after some time it back to 34 Ohms. Next to this coil is up1727q. And there are 3,3 on vin pin and 5v on vdd pin. I changed this chip with another one but it didnt help. When i tried Short circuit test, core didnt heat up so maybe its still alive. I dont have thermal camera :/. I dont have boardview and schemstic for this GPU too. What should i check next? Or maybe its just dead core? -
Hi, I need the schematic and boardview of a Radeon RX 5700 Pulse, sometimes it turns on, sometimes it doesn't... I checked when it doesn't turn on, the enable signal is missing on pin 15 EN2 3v to power 1.8v... the problem is that when it works I can't test it since the signal is present... I would like to check the signal paths but I would need the diagram and the boardview thanks... -
I am looking at an A2337 and found this for the order of power rails and what they do. Can this be confirmed before I dive into hunting down power rails that do not exist or are not neccisary?
- PPBUS_G3H (12.6V-12.8V)
- This is the main power rail that supplies power to the entire system. Check this rail first, as it must be present for other power rails to work.
- PP3V42_G3H (3.42V)
- This power rail is derived from PPBUS_G3H and is used to power the SMC (System Management Controller) and other essential circuits. It should be present if PPBUS_G3H is working correctly.
- PPVRTC_G3H (3.3V)
- This
- PPBUS_G3H (12.6V-12.8V)
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