acedogblast
Senior Member
Last Activity: 01-26-2025, 01:35 PM
Joined: 02-15-2023
Location: Charlotte NC
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See attached. I have already removed the wifi card but no change when pressing power button....
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Lenovo Thinkpad T14s gen2i (NM-D362) not starting up after wifi upgrade attempt.
After attempting to upgrade the soldered 1216 Wifi module my motherboard no longer turns on. The board works before the upgrade attempt so that would certainly mean some components got knocked off accidentally but I can not find any missing components. I have thoroughly checked the whole board multiple times so lets do some tests from scratch.
Things that currently work:[LIST][*]USB-C PD for 20V[*]Battery charging[*]VCC5M and VCC5_PD[*]VCC3M[*]VCCPCHCORE (1.8V)[/LIST]I have checked and verified that PWRSWITCH has 3.3V and goes low when pressing the power button. This is measured at... -
Some additional info on these soldered "1216" intel wifi modules. There are 2 interface methods PCIe+USB or CNVi. The modules with end with 1 in the model code (such as AX201, AX211, etc) use the CNVi interface which is proprietary and is not interchangeable with different versions of CNVi. Laptops that use the PCIe+USB modules end with 0 in the model code (such as AX200, AX210, BE200) may be interchangeable.Leave a comment:
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Soldered wifi upgrade to wifi 7 BE200D2W from older AX2xx based moduels.
I have finally found a source for Intel's BE200 wifi soldered "1216" sized modules (not the larger 2230 removable M.2 modules) and I was wondering if it is possible to swap the older AX2xxD2W wifi 6/6e with this new wifi 7 module on a laptop. Supposedly both the BE200D2W and the older AX2xxD2W chips use the standard "M.2 1216 footprint" but with an additional inner-ring of pads. We have schematics of various laptops that use the AX2xxD2W chips on this forum. What we need is a schematic of a laptop that uses the new BE200D2W to check if the pinout is identical or not. Do anyone... -
Hello I can confirm that replacing MEC1503 chip with another from a laptop without SVP does work. You can see how I did it in my post here: [url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/3498772-guide-to-transplant-mec1503-ec-chip-and-eeprom-reprogamming-for-t14s-gen-2-and-x13-gen-2[/url]https://Hello I can confirm that rep...evices-and-eleLeave a comment:
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Guide to transplant MEC1503 EC chip and EEPROM reprogamming for T14s gen 2 and X13 gen 2
This is a guide that I am writing for helping others to replace their MEC1503 EC chip if it breaks (or to get around an inconvenient prompt to the BIOS). This forum has been extremely helpful to me so I would like to contribute to help others. I will tell you right now that this task is very difficult to do. You MUST have experience and tools to do precision micro-soldering, BGA reballing, trace repair, and general laptop repair skills.
There are some specialty tools needed to do this task. The replacement MEC1503 chips can be acquired from Aliexpress. Do not buy the bare chips as... -
Re: [Marantz SR5012] Center channel keeps going into ASO/Overcurrent protection.
All of the parts I have bough are from either Digi-key or Mouser. So I don't think that they are fake. Either way I have decided to give up repairing the center channel. I now plan to disable the center channel on the amp board and use external amplification for the center channel since this AV receiver has preouts. Thanks for all of your help.Leave a comment:
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Re: [Marantz SR5012] Center channel keeps going into ASO/Overcurrent protection.
Emitter resistors for both Q428 and Q434 measure fine at 0.5 ohms.Leave a comment:
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Re: [Marantz SR5012] Center channel keeps going into ASO/Overcurrent protection.
Disaster! The breaker for my room tripped and the "Magic Smoke" was released on the center channel. It happened when I turned the volume up. Worse yet both output driver transistors Q428 and Q434 now have shorts on collector to emitter but to base they are fine.Leave a comment:
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Re: [Marantz SR5012] Center channel keeps going into ASO/Overcurrent protection.
I have already replaced R511 and R512. Both measure 0.2 ohms as they are in parallel and I have subtracted the meter's lead resistance.
R518 and R517 measure 0.9 ohms which is high. Going to replace them right now. I remembered that they measured fine before though.Leave a comment:
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Re: [Marantz SR5012] Center channel keeps going into ASO/Overcurrent protection.
I measured another channel and it also measured 2.3V.Leave a comment:
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Re: [Marantz SR5012] Center channel keeps going into ASO/Overcurrent protection.
I put in a new Q434 since I bought a few 2SB1647s. Powering up the base two base DC voltage between Q428 and Q434 is 2.3V. Readjusting the DC bias does not change it.Leave a comment:
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Re: [Marantz SR5012] Center channel keeps going into ASO/Overcurrent protection.
Ok so I disconnected both output transistors and the result is just as I thought. All channels work expect the center one which is to be expected. This just further confirms that the center channel is the one with the problem.Leave a comment:
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Re: [Marantz SR5012] Center channel keeps going into ASO/Overcurrent protection.
You want me to take out both output transistors for the center channel? Can you please describe how will removing them help me find the root cause? I am just unsure of the purpose of that....Leave a comment:
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Re: [Marantz SR5012] Center channel keeps going into ASO/Overcurrent protection.
It tests fine. I know it is the center channel that has a problem as all others work fine....Leave a comment:
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Re: [Marantz SR5012] Center channel keeps going into ASO/Overcurrent protection.
This is not a false positive. I read 0.72VDC (could be higher) on ASO_DET pin by connecting probes on one leg of C515 and the ground to jumper J584 which leads to the other pin of C515.
I also do not think this is a loose connection as tapping around the PCBs do not trigger any protection.Last edited by acedogblast; 03-02-2023, 05:27 PM.Leave a comment:
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Re: [Marantz SR5012] Center channel keeps going into ASO/Overcurrent protection.
mmartell are you suggesting that this is just a false positive caused by loose connections?
Looking at the schematic the ASO_DET pin on N1019 will go though a transistor (Q1025) that will pull down a 3.3V signal voltage that if not giving a high signal to the main CPU will cause the CPU to go to into protection.
I'm going to hook up my oscilloscope to the ASO_DET pin on N1019. If this is a false positive then I shouldn't see any activation voltage to Q1025.Last edited by acedogblast; 03-02-2023, 04:10 PM.Leave a comment:
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Re: [Marantz SR5012] Center channel keeps going into ASO/Overcurrent protection.
R509 is reads larger that the other channel's counterpart at 207.9ohms. The similar resistors are around 180 to 190 ohms. All other resistors measure fine compared to the similar resistors in other channels.Last edited by acedogblast; 03-02-2023, 02:41 PM.Leave a comment:
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Re: [Marantz SR5012] Center channel keeps going into ASO/Overcurrent protection.
Yes I have used 2 different speakers. Same result....Leave a comment:
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[Marantz SR5012] Center channel keeps going into ASO/Overcurrent protection.
First off I would like to thank this community as it has provided me with great information that has helped me greatly on my repair for this Marantz SR5012 AV receiver. I am creating this new thread as the other 2 that I have created here has had their original question/problem solved and I plan that this is the final thread on my repair. Please note that this is my first time repairing audio amplifiers so I may not be aware of common issues and things to know.
Lets start at what I have done so far. Random speaker popping on all channels is fixed by replacing the 2 large filter...
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