Problems? See this thread at archive.org.
Below is the video I used to get familiar with the programmer I purchased. The test clip will clip on directly to the bios chip itself and the other end goes to the bios programmer. The rest of the instructions previously posted should be followed exactly and you should be okay.
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Hey all!
I now have brightness control on the AUO FHD panel B140HAN01.2 !
A special thanks to @arvest , @t456 and @jim22 ! Maybe I left some initial key persons out who made the first fundamental findings. In that case, thanks to you as well.
The project was put on hold for some months, but managed to get some spare time and a period, where I could risk having to switch computer, if something went wrong.
Luckily (and due to your advice) nothing did
I used the Arduino-to-reprogram-the-EEPROM-method.
In short the steps to modify the new panel was:
- Peeled off the black protection foil/plastic on one side to reveal the PCB board and found the EEPROM (GT 45A) as well as the pin-outs, related to the EEPROM. These were named, EP_WP (write-protect), MSCL, MSDA and XVCC. I grounded the Arduino to the outer screws connected to the circuit board. See my previous post. Tested these with a multimeter.
- Got hold of an Arduino as well as a level converter to downscale the voltage. However, the EEPROM itself is capable of handling 5V (as the Arduino is running at), but as @arvest wrote in his writeup, there could be some components running at lower voltage. Haven’t tested it on the AUO board though
- Connected the Arduino to the PCB board (through the level converter)
- Ran the reading-code based on @arvest with @jim22 modifications (and some changes from myself). Here I found, that if I read 256 bytes, the EDID was written twice. (Note! Had to use an older Arduino IDE (v1.0.6) to run the codes without errors)
- Found the (full) whitelisted EDID for the AUO B140HAN01.2 @t456 provided
- Powered off the EEPROM (Arduino) and hard-wired the write-protect pin-out to ground
- Ran the writing-code with the white-listed EDID (I wrote two times the EDID to bytes 0-255 to be on the safe side)
- Powered off the EEPROM (Arduino) and un-wired the write-protect,
- Ran the read-code again to confirm that it was written (had to re-read it to have the correct EDID display.)
I considered switching to the reprogramming the BIOS, when I read it worked, but was too nervous about ruining the computer instead of only the panel.
In the process I considered only changing the header, but realized by rereading the thread that the BIOS of course wouldn’t accept it, if it had the whole EDID on the white-list and not only the headerIDs.
If you want a more thorough guide, I would like to help you, please write.
Thanks again.edit1754, arvest, 0xmaTTY and 1 other person like this. - Peeled off the black protection foil/plastic on one side to reveal the PCB board and found the EEPROM (GT 45A) as well as the pin-outs, related to the EEPROM. These were named, EP_WP (write-protect), MSCL, MSDA and XVCC. I grounded the Arduino to the outer screws connected to the circuit board. See my previous post. Tested these with a multimeter.
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I'm trying to find the pin-outs for my LCD so that I can write the white-listed lenovo edid to the eeprom.
The display i've bought is the B140HAN01.3. It is an original model from the factory.
Here is a picture from the front PCB:
![[IMG]](images/storyImages/2711b0652e.png)
And the back:
![[IMG]](images/storyImages/27150d9a3b.png)
Largerly inspired by @ KnielsenDK , I have found following pin-outs:
1. MSDA
2. MSCL
3. EP_WP
4. GND (I'll just connect GND to one of the outer screws.)
I have not yet found the VCC Pin.(
Does anybody with experience know where to connect the VCC? -
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ahh didn't know it was more data than edid..
But like I say I followed that PDF to the latter
So this was what was written in theory..
{0x83,0x84,0xdc,0x85,0x27,0x1f,0x38,0x11,0x61,0x02,0xa9,0x4f,0x31,0x95,0x0d ,0x8e,0x7b,0xbd,0x10,0xd1,0x8e,0xfb,0xdc,0xe3,0x5a,0x16,0x38,0x3a,0xa3,0x20 ,0xbe,0x5d,0x08,0x68,0xa5,0x0c,0xf2,0xfb,0xa3,0x92,0xc9,0x75,0x5b,0x4b,0x85 ,0x67,0x5a,0xb0,0x32,0x5e,0x5e,0x59,0x55,0x43,0x10,0xd4,0x96,0x83,0x5b,0x23 ,0x75,0xbf,0x28,0xc6,0xb9,0xd9,0x07,0xcc,0x89,0x4b,0x09,0xd7,0xab,0xcc,0x96 ,0xcb,0xda,0x99,0x27,0x2d,0x7e,0x13,0x0a,0xd4,0xd5,0x98,0xbd,0xe7,0x26,0xc1 ,0xb5,0x62,0x77,0x56,0x64,0x67,0x41,0xec,0x45,0xa3,0x50,0xc5,0x94,0x45,0x94 ,0xfb,0xb6,0x4b,0xbb,0x3e,0x9c,0x95,0xcb,0xa1,0xa4,0x28,0xe4,0x52,0xa0,0xcf ,0x29,0x5e,0x7b,0xa9,0xfc,0xea,0x27,0xee};
This was the actual code I loaded to the arduino to write to the eeprom.. straight copy paste from the pdf which is where I think I've gone wrong.
So maybe I can get away with just writing the EDID from the correct file to repair? if not then the best option is to just grab another panel and then make a backup to restore the panel. (if I've not damaged it some other way)Code:#include <Wire.h> #define disk1 0x54 //Address of 24LC256 eeprom chip #define WP_PIN 4 //Write protect pin char lenovo_EDID[128] = {0x83,0x84,0xdc,0x85,0x27,0x1f,0x38,0x11,0x61,0x02,0xa9,0x4f,0x31,0x95,0x0d ,0x8e,0x7b,0xbd,0x10,0xd1,0x8e,0xfb,0xdc,0xe3,0x5a,0x16,0x38,0x3a,0xa3,0x20 ,0xbe,0x5d,0x08,0x68,0xa5,0x0c,0xf2,0xfb,0xa3,0x92,0xc9,0x75,0x5b,0x4b,0x85 ,0x67,0x5a,0xb0,0x32,0x5e,0x5e,0x59,0x55,0x43,0x10,0xd4,0x96,0x83,0x5b,0x23 ,0x75,0xbf,0x28,0xc6,0xb9,0xd9,0x07,0xcc,0x89,0x4b,0x09,0xd7,0xab,0xcc,0x96 ,0xcb,0xda,0x99,0x27,0x2d,0x7e,0x13,0x0a,0xd4,0xd5,0x98,0xbd,0xe7,0x26,0xc1 ,0xb5,0x62,0x77,0x56,0x64,0x67,0x41,0xec,0x45,0xa3,0x50,0xc5,0x94,0x45,0x94 ,0xfb,0xb6,0x4b,0xbb,0x3e,0x9c,0x95,0xcb,0xa1,0xa4,0x28,0xe4,0x52,0xa0,0xcf ,0x29,0x5e,0x7b,0xa9,0xfc,0xea,0x27,0xee}; void setup(void) { digitalWrite(WP_PIN, LOW); //disable write protect to be safe Serial.begin(9600); Wire.begin(); for (unsigned int address = 0; address <= 127; address++) { writeEEPROM(disk1, address, lenovo_EDID[address]); } } void loop(){} void writeEEPROM(int deviceaddress, unsigned int eeaddress, byte data ) { Wire.beginTransmission(deviceaddress); Wire.write(eeaddress); Wire.write(data); Wire.endTransmission(); delay(5); } byte readEEPROM(int deviceaddress, unsigned int eeaddress ) { byte rdata = 0xFF; Wire.beginTransmission(deviceaddress); Wire.write(eeaddress); Wire.endTransmission(); Wire.requestFrom(deviceaddress,1); if (Wire.available()) rdata = Wire.read(); return rdata; }
Thanks for the fast reply btw.
Regards
Dave -
Yes, that was random data, so it'd brick any panel (it isn't even a valid edid). The instruction pdf also mentions this:
![[IMG]](images/storyImages/30uwvme.png)
No harm done; flashing the SPK1 edid will fix it and have working brightness control. The pseudo code was also 128 bytes, so nothing else was overwritten. -
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w550s/t550 LCD screen replacement - brightness set at max.
Discussion in 'Lenovo' started by giggidy, Apr 5, 2015.
