Developer79 Posted August 29 Share Posted August 29 Hi, here an Test with P870TM and RTX4070MXM: 1 Link to comment Share on other sites More sharing options...
SuperMG Posted August 29 Author Share Posted August 29 1 hour ago, Developer79 said: Hi, here an Test with P870TM and RTX4070MXM: Hello! What's the max TDP you got? You were thermal throttling? Didn't you use a 1mm shim on the die? Link to comment Share on other sites More sharing options...
SuperMG Posted August 29 Author Share Posted August 29 Thanks to @Developer79for confirming my hypothesis on the backlight pins. Yes the pin 23, 25, 27 were indeed needed! Sadly Developer79 didn't find a way to do some hardware mods on the PCB of the RTX 4070 MXM. He did it on his MXM connector, which doesn't make the MXM card plug and play on almost any mxm laptops. Although... I'll try my best to solder these 3 pins. The red line is 2 wires. (280 to 23, 25) The green line is 1 wire (278 to 27) If I can't solder these... I need to contact someone else to solder these pins! Wish me luck once I get the 4070 MXM back home! 2 Link to comment Share on other sites More sharing options...
SuperMG Posted Monday at 01:30 PM Author Share Posted Monday at 01:30 PM Hello. Here's a new clear picture. It shows how to do the mod. It's the right one. I checked the datasheet for the RTX 3060/3070/3080 (from X-VSION, probably the same for ZRT). They also lack the backlight pins 23,25,27 and the vbios don't have eDP. Although, they have DP on DP_D. Theorically, if the backlight pins are modded like on the picture I've sent, the DP could be displayed in the eDP screen! I know you 4 guys have the RTX 3060 or 3080 from X-Vsion. If you have an eDP laptop that has signals for DP_D between pins 206 and 236 of the MXM slot, you can try this mod and let us know please! @sliderfra @therhor70 @aldarxt @ssj92 Link to comment Share on other sites More sharing options...
Developer79 Posted Tuesday at 07:15 AM Share Posted Tuesday at 07:15 AM On 8/29/2025 at 2:20 PM, SuperMG said: Thanks to @Developer79for confirming my hypothesis on the backlight pins. Yes the pin 23, 25, 27 were indeed needed! Sadly Developer79 didn't find a way to do some hardware mods on the PCB of the RTX 4070 MXM. He did it on his MXM connector, which doesn't make the MXM card plug and play on almost any mxm laptops. Although... I'll try my best to solder these 3 pins. The red line is 2 wires. (280 to 23, 25) The green line is 1 wire (278 to 27) If I can't solder these... I need to contact someone else to solder these pins! Wish me luck once I get the 4070 MXM back home! 17 hours ago, SuperMG said: Hello. Here's a new clear picture. It shows how to do the mod. It's the right one. I checked the datasheet for the RTX 3060/3070/3080 (from X-VSION, probably the same for ZRT). They also lack the backlight pins 23,25,27 and the vbios don't have eDP. Although, they have DP on DP_D. Theorically, if the backlight pins are modded like on the picture I've sent, the DP could be displayed in the eDP screen! I know you 4 guys have the RTX 3060 or 3080 from X-Vsion. If you have an eDP laptop that has signals for DP_D between pins 206 and 236 of the MXM slot, you can try this mod and let us know please! @sliderfra @therhor70 @aldarxt @ssj92 Each motherboard must be examined individually and then modified accordingly. Not all displays function in the same way. However, those from Clevo usually do! Link to comment Share on other sites More sharing options...
SuperMG Posted Tuesday at 07:31 AM Author Share Posted Tuesday at 07:31 AM 17 minutes ago, Developer79 said: Each motherboard must be examined individually and then modified accordingly. Not all displays function in the same way. However, those from Clevo usually do! I compared some Clevo P7XX and P870 they do indeed have the same pinouts! Same for the Alienware M17X R4 (it has a mux switch for the eDP connector unlike Clevo) The backlight pins are universal. I can't confirm if other laptops are compatible with that. Some may have different signals for eDP like not being set for port D... Better find the MXM pinouts diagram for your laptop! Link to comment Share on other sites More sharing options...
SuperMG Posted Tuesday at 04:54 PM Author Share Posted Tuesday at 04:54 PM @Developer79 Solder-less idea, using thin flex cables and one wire. (Sorry for the bad example) Link to comment Share on other sites More sharing options...
sliderfra Posted Wednesday at 05:11 AM Share Posted Wednesday at 05:11 AM 12 hours ago, SuperMG said: @Developer79 Solder-less idea, using thin flex cables and one wire. (Sorry for the bad example) As both 278/280 pins are 3.3v & the 3 others are BL pins (that need 3.3V), you may solder blob the 278+280 & 23/25/27 then solder a single wire between them. I think that the easiest solution. One might even put a switch if mod is not needed to revert to standard specs. EDIT: you need to check schematics as MXM pinout on laptop might not be exactly the same. If you solder 3.3V on GND pin you end up with a dead short Link to comment Share on other sites More sharing options...
Developer79 Posted Wednesday at 11:41 AM Share Posted Wednesday at 11:41 AM 6 hours ago, sliderfra said: As both 278/280 pins are 3.3v & the 3 others are BL pins (that need 3.3V), you may solder blob the 278+280 & 23/25/27 then solder a single wire between them. I think that the easiest solution. One might even put a switch if mod is not needed to revert to standard specs. EDIT: you need to check schematics as MXM pinout on laptop might not be exactly the same. If you solder 3.3V on GND pin you end up with a dead short Yes, be careful when soldering because of short circuits! Link to comment Share on other sites More sharing options...
SuperMG Posted Wednesday at 12:01 PM Author Share Posted Wednesday at 12:01 PM 19 hours ago, Developer79 said: Yes, be careful when soldering because of short circuits! Hello. Do you know the width of one MXM pin? Is it 0.3mm? 0.35mm? Literally no information online other than one thing... 0.5mm pitch, that's it. Here's how it should be. Link to comment Share on other sites More sharing options...
SuperMG Posted 9 hours ago Author Share Posted 9 hours ago On 9/3/2025 at 2:01 PM, SuperMG said: Hello. Do you know the width of one MXM pin? Is it 0.3mm? 0.35mm? Literally no information online other than one thing... 0.5mm pitch, that's it. Here's how it should be. Hello guys. I managed to finish the design and I'll find a manufacturer. Link to comment Share on other sites More sharing options...
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