43 lines
1.4 KiB
Markdown
43 lines
1.4 KiB
Markdown
# Lenovo T431s
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## Disassembly Instructions
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You must remove the following parts before flipping the mainboard
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off the main frame:
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* Base cover
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* Hard disk drive
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* Battery pack
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* Keyboard
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Its [Hardware Maintenance Manual](https://thinkpads.com/support/hmm/hmm_pdf/t431s_hmm_en_0c10894_02.pdf) could be used as a guidance of disassembly.
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The WSON-8 flash chip (surrounded with red circle in the photo above)
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sits on the opposite side of the mainboard, under a piece of insulating
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tape. If solders between the chip and soldering pads fortunately
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overflows beside the chip as tiny tin balls attached to soldering pads,
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it will be possible to use a pomona 5250 clip to hold the chip, with
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its metal tips just attached to tin balls, thus connecting the chip to
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the programmer.
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```eval_rst
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:doc:`../../flash_tutorial/ext_power`
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```
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Currently, detecting the model of soldered RAM at runtime and loading
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the corresponding SPD datum from CBFS is not implemented yet. You may
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have to dump the SPD data when running the vendor firmware with
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inteltool, and replace the content of the SPD hex with what is dumped.
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(the mechanism may be similar to that on x1_carbon_gen1 and s230u, but
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I do not know how to find gpio ports for that, and SPD data stored in
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vendor firmware.)
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[T420 / T520 / X220 / T420s / W520 common]: xx20_series.md
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