[Transformer TF300T Q&A, Help & Troubleshooting] mabretske:
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Dear mabretske,

Hello, Mike.

Yes, we tested this pcb again and it works fine.

Thank you.

Best Regards,

Eugene

- techno_force

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From: mabretske

To: techno_force

Subject: Re: techno_force sent a message about OEM ASUS TF300T 32GB 16GB Tablet SD Card Slot Touchscreen Board with Cable TF300 #190784972545

Sent Date: Mar-07-13 22:01:18 PST

Dear techno_force,

Eugene,

As we discussed - can you please give me confirmation/validation that this pcb indeed tested good upon return..

This is important to my ongoing troubleshooting.

Much appreciated..

Thank you

- mabretske

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Fact: Installed replacement G01 and G03 digitizers to remedy shattered digitizer issue (original digitizer type uncertain).

Fact: Mainboard, TS pcb or respective interconnecting ribbon cable between the two were never disturbed during the process with exception of plugging in the replacement digitizer ribbon cables into the TS pcb..

Fact: Everything above was carried out WITH the battery plugged in.

Fact: Replaced TS pcb and tested with G01 and G03 digitizers; still no touch. PCB tested good when returned for refund.

Fact: All possible permutations of TS pcb (existing/replacement), digitizer (G01/G03) and TS pcb cable from TS pcb to mainboard (existing/replacement) were tried without success/change)

Fact: Touchpanel firmware is ELAN-3011-4822 and has been so throughout the process.

Fact: Practically all firmware (camera, bluetooth, etc) as well as kernal and OS have experienced automatic updates throughout this process with the exception of the Touch firmware.

Fact: All faculties of the system operate without issue from keyboard dock, wifi, gps, sd card slot, hdmi, headphone, camera, etc, etc, with touch being the ONLY exception.

Fact: Touch works sporadically and inconsistently w/G03 digitizer when enough pressure is applied - sometimes.. This was discovered after return of the prospective replacement TS pcb.

Hearsay: TS pcb vendor states that ELAN-3011-4822 touch firmware is designated for the 5158N FPC-1 digitizer

Hearsay: TS pcb vendor states that the touch firmware auto-updates on the "latest" mainboards and the fix is exact digitizer replacement or mainboard replacement for those with 5158N digitizer issues.

Other: I believe the MobileDock version DOCK-EC20N-0207 has not experienced an update throughout this process.

Other: I believe Pad EC version PAD-EC20T-0216 has not experienced an update throughout this process.

Conjecture: I believe the capacitive properties of alternate digitizer runs are different and that the firmware has the appropriate code to scan the rows and columns of the different types of digitizer appropriately such that the timing is properly sequenced. I cannot definitively explain why "earlier" model mainboards cannot auto-update touch firmware other than to say it was perhaps a planning/engineering oversight resulting in a hardware bug. This is not uncommon.

Conjecture: Some firmware can only be written in one direction (0's from 1's or vice versa) and once written cannot be effectively overwritten without first being wiped via a secondary process (another toggle bit expressly designed explicitly for mass erasure), in such a scenario, if an engineering oversight prevents erasure, the firmware can never be replaced.