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Methods:
1. Starting from new series of T6 , X6 and R6, the SPD of LCD cables are totally changed.
In the previous ThinkPad models of like T4 and R5, the originally-equipped LCDs with different resolutions have their own corresponding LCD cables which are distinct from each other. The most prominent change in the LCDs of new series of T60/T61, X60/X61 and R60/R61 is that the LCD cables are all the same no matter what resolution they are working with.
After a thorough inspectation of all these cables, the author found that the new T60cables come with more data links than previous T4 cables in order to read the on-board SPD(Serial Presence Detect) information.
2. EDID(Extended Display Identification DATA)
The LCD cables in new series T6x are all the same except their lengthes are difference for models of 14.1" and 15". So you may ask how these cables support different resolutions of LCDs? The answer is that the SPD information resided in the LCDs tells the difference, which we call EDID(Extended Display Identification DATA).
We can retrieve the LCD's SPD information by using EPROM reader 24C02. The SPD information can be read at 4 lines (from 4 pin to 7 pin) of the 30-pin LCD . The detailed definition of this SPD is as follows: pin 4:3.3V, pin 5:vacant, pin 6:SCL, and pin 7:SDA.
3. QXGA in T60
The QXGA LCDs were originally supplied by IDTech with the resolution of 2048*1536 and IPS, which made them undetectable by the new T60's even with the help of EDID. The author found that the SPD information in the QXGA LCDs (provided by HOPE, the Administrator of 51nb.com) was totally vacant, which leaves a technical difficulty ahead. After a painstaking experiment of comparing all those SPDs of XGA, SXGA+ and UXGA, the author solved this problem by rewriting the SPD information of QXGA and finally succeeded in making T60 correctly read the SPD of QXGA.
The well-rewritten SPD is attatched as follows:
[attach]432997[/attach]
[ Edited by ybyan on 2007-11-28 01:52 ]
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