UMA conversion LA-4982P (Toshiba Satellite Pro L500 series)
Hello,
I have two almost identical computers, unfortunately both with a faulty MXM graphics card. More specifically:
- One doesn't enable the backlight and exhibits artifacts in the form of colored stripes, with the drivers crashing immediately with a BSoD upon loading.
- One was exhibiting very similar if not identical artifacts and then the GPU became fully shorted, right after a reflow attempt.
Since the LA-4982P was also manufactured without the MXM slot (pads unpopulated), I immediately thought about performing a UMA conversion. Unfortunately there appear to be no guides whatsoever and I'm pretty sure it's because:
1. A few components must be added.
2. There is no boardview available.
3. The silkscreen is almost non-existent, making it quite hard to understand the references in the schematics.
I decided to do it myself, double-checking with photos of the non-MXM variant and ignoring external display (VGA, HDMI) stuff for now:
The "For UMA" circuit seems to be working fine as it outputs 1.88V and I'm pretty sure the other 3 modifications are correct.
Unfortunately the motherboard doesn't appear to be POSTing, despite a steady consumption of 0.90A. The orange (Wi-Fi) LED on the front never comes on and there is no picture nor backlight.
Interestingly, the fan turns on and off just fine while in that state, meaning that temperature monitoring and control is okay.
Does anyone have a clue? Thanks in advance!
I have two almost identical computers, unfortunately both with a faulty MXM graphics card. More specifically:
- One doesn't enable the backlight and exhibits artifacts in the form of colored stripes, with the drivers crashing immediately with a BSoD upon loading.
- One was exhibiting very similar if not identical artifacts and then the GPU became fully shorted, right after a reflow attempt.
Since the LA-4982P was also manufactured without the MXM slot (pads unpopulated), I immediately thought about performing a UMA conversion. Unfortunately there appear to be no guides whatsoever and I'm pretty sure it's because:
1. A few components must be added.
2. There is no boardview available.
3. The silkscreen is almost non-existent, making it quite hard to understand the references in the schematics.
I decided to do it myself, double-checking with photos of the non-MXM variant and ignoring external display (VGA, HDMI) stuff for now:
The "For UMA" circuit seems to be working fine as it outputs 1.88V and I'm pretty sure the other 3 modifications are correct.
Unfortunately the motherboard doesn't appear to be POSTing, despite a steady consumption of 0.90A. The orange (Wi-Fi) LED on the front never comes on and there is no picture nor backlight.
Interestingly, the fan turns on and off just fine while in that state, meaning that temperature monitoring and control is okay.
Does anyone have a clue? Thanks in advance!