First, check diode mode to ground at 3V3_S4.
If good, check U8210 voltages; pins 1, 3, 4.
Do you get 5V_S0?
If good, check U8210 voltages; pins 1, 3, 4.
Do you get 5V_S0?
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820-00875-a - a1708 - frying SSD'S
- Thread starter Anterweb
- Start date
Do you get L7670 voltage at least?
If yes, check output voltages from pages 59/61/62.
Remember to check in the 10s when you nothe the trackpad click feedback.
If yes, check output voltages from pages 59/61/62.
Remember to check in the 10s when you nothe the trackpad click feedback.
"power on for 10 off for 5 seconds cycle"
Anterweb
Member
Nope, 0v at L7670
I'm wondering how do you get L7210/20 voltage then...
"L7210 and L7220 both Start at 1.5v then instantly drop to 0.0v"
Tell us what is actual situation; 1.5V, 2.0V, 0V...
In the 10 seconds when you note the trackpad feedback is the moment to check for voltage on the board.
Tell us what is actual situation; 1.5V, 2.0V, 0V...
In the 10 seconds when you note the trackpad feedback is the moment to check for voltage on the board.
CPU was probably damaged, when you did the short...
The password can be removed on thise model; usually flashing BIOS.
That can cause weird problems in time.
Need to clean ME region in BIOS, if use the chip from other board.
Need to clean ME region in BIOS, if use the chip from other board.
Anterweb
Member
I have decided to leave the old bios chip on its logic board as I still may be able to get it back to life some day,
So I need a new bios chip for the board arriving tomorrow , I can buy a pre programmed one from Ebay for £10 for this logic board or would you recommend I purchase the hardware required to flash it myself. This is something I have never done before but with the amount of mac repairs I am now receiving I think it is something I should learn and after looking into it last night it does not appear to be something outside of my skillset with the right advice.
My only concerns are what hardware to buy and where to find the needed bios files,
any advice on this much appreciated.
So I need a new bios chip for the board arriving tomorrow , I can buy a pre programmed one from Ebay for £10 for this logic board or would you recommend I purchase the hardware required to flash it myself. This is something I have never done before but with the amount of mac repairs I am now receiving I think it is something I should learn and after looking into it last night it does not appear to be something outside of my skillset with the right advice.
My only concerns are what hardware to buy and where to find the needed bios files,
any advice on this much appreciated.
Medusa is most recommended for Apple stuff.
There are also other dedicated programmers available on Internet, with some kind of flex to connect directly to the logic board (J6100).
If you desolder/resolder the BIOS chip, then cheaper programmer (like CH341A, TLL866, EZP2019) may be used.
When you need a BIOS dump, just ask on the forum...
There are also other dedicated programmers available on Internet, with some kind of flex to connect directly to the logic board (J6100).
If you desolder/resolder the BIOS chip, then cheaper programmer (like CH341A, TLL866, EZP2019) may be used.
When you need a BIOS dump, just ask on the forum...
Anterweb
Member
So my programmer arrived today,
it looks like I can solder the chip directly onto the back of the programmer ( See pic ) but i'm also reading that its 3v direct from programmer then I have an adaptor (in pic 1 ) that looks like its a 1.8v. so I'm not sure what to put the chip onto at this point,
I have had a play with the software using an old winbond chip from an old laptop and it seems easy enough to read, wipe and re programme.
I just now need a clean bios file dump to use with the clean ME religion you mentioned before.
it looks like I can solder the chip directly onto the back of the programmer ( See pic ) but i'm also reading that its 3v direct from programmer then I have an adaptor (in pic 1 ) that looks like its a 1.8v. so I'm not sure what to put the chip onto at this point,
I have had a play with the software using an old winbond chip from an old laptop and it seems easy enough to read, wipe and re programme.
I just now need a clean bios file dump to use with the clean ME religion you mentioned before.
Last edited:
"religion"
???
You can't solder the chip directly.
It will cause short between data lines; didn't see the central pad?
Look the pictures first:
drive.google.com
drive.google.com
???
You can't solder the chip directly.
It will cause short between data lines; didn't see the central pad?
Look the pictures first:
WSON-1.jpg
drive.google.com
WSON-2.jpg
drive.google.com