Enabling CSC mode on laptop motherboard

[mcplslg123]

Does anyone knows here how to enable CSC mode in laptop motherboard?? This is very useful where you can check all the rails even without SOC. I need to know this so that i can be absolutely sure about all rails before going ahead with SOC replacement.

I know its possible but dont know how.

Anyone willing to share??

[mcplslg123]

Re: Enabling CSC mode on laptop motherboard

No one knows??

[SMDFlea]

Re: Enabling CSC mode on laptop motherboard

No one knows??

No idea what CSC mode is ,can you give a description what the letters stand for and what its supposed to do

[mcplslg123]

Re: Enabling CSC mode on laptop motherboard

CSC MODE=COMMON SERVICE CENTRE MODE.

This is the mode where all rails will rise for a brief moment when triggered including vcore and that too without SOC soldered. Manufacturers use this mode before putting SOC on motherboard.

I'm dead sure it can be triggered on laptop mb's as i watched a YT video and the person was showing all the rails coming up without SOC. That video is in hindi-so most of you wont understand the language. If you want i can link that.

This is applicable for smart phones also.

[mon2]

Re: Enabling CSC mode on laptop motherboard

Sure, link it please. Never knew this mode existed.

[mcplslg123]

Re: Enabling CSC mode on laptop motherboard

Here is the link

https://www.youtube.com/watch?v=kVtkzFx8HlU

[mcplslg123]

Re: Enabling CSC mode on laptop motherboard

Sure, link it please. Never knew this mode existed.

You'll get convinced after watching the linked video.

[mon2]

Re: Enabling CSC mode on laptop motherboard

So he is using some edge connector tabs to trigger each power rail. Used by the factory to test the same rails BEFORE the expensive CPU/ GPU is installed. Motherboards must be a PCBA nightmare.

Would you have the schematics and bv file for the board in the video? Or a similar one?

We can then review the net names he is probing (gold edge connector tabs) to trigger each such rail under test.

Kind of like jtag is to digital logic but appears to be for power rail testing only. We are reviewing a jtag interface for a pending FPGA design so this is similar. Jtag requires a preset number of clock and data pulses to transition through various logic state machines.

Unless I missed it, he appears to be only touching the trigger pin with a logic low or logic high to toggle on/off.

[mcplslg123]

Re: Enabling CSC mode on laptop motherboard

Themb in the video seems like LA-E791P or E801P for which scheme is there in badcaps. Not sure about the bdv file. yes he has just jumpered a wire to power button to trigger the mb.

[ktmmotocross]

Re: Enabling CSC mode on laptop motherboard

i see that guy have some knowledge

[sohail5307]

Re: Enabling CSC mode on laptop motherboard

So he is using some edge connector tabs to trigger each power rail. Used by the factory to test the same rails BEFORE the expensive CPU/ GPU is installed. Motherboards must be a PCBA nightmare.

Would you have the schematics and bv file for the board in the video? Or a similar one?

We can then review the net names he is probing (gold edge connector tabs) to trigger each such rail under test.

Kind of like jtag is to digital logic but appears to be for power rail testing only. We are reviewing a jtag interface for a pending FPGA design so this is similar. Jtag requires a preset number of clock and data pulses to transition through various logic state machines.

Unless I missed it, he appears to be only touching the trigger pin with a logic low or logic high to toggle on/off.

I think he did work on VCC_core section.
For example : The method of NCP6131 to remove the resistance and output the voltage, NCP6121 is also applicable to
the 31-pin VBOOT grounding resistance changed from 10K to 25K-165K, and the core power supply can also be used when the CPU is not installed.
The 27-pin VBOOTA grounding resistance is changed from 10K to 25K-165K. When the CPU is not installed, the integrated display power supply is also provided). Passed the test. The purpose of doing this is to judge the quality of the PWM circuit part of the chip when there is no CPU installed and no SVID signal.