Intel D865GLC BIOS chip location (Tektronix TLA5000, TDS5000 series HW) - Page 1
Forum section: electronics / repair

author: newtekuser
author_rank: Frequent Contributor
timestamp: March 03, 2023, 08:09:01 pm
content: I'm trying to dunp the custom BIOS off a motherboard that is used in the Tektronix TLA5000 and TDS5000 HW but I cannot find the BIOS chip.There's no winbond chip and all 8 SOICs on the motherboard are not eeproms - I took the numbers off them and googled for the datasheets. I could have missed some...

author: feedback.loop
author_rank: Frequent Contributor
timestamp: March 03, 2023, 08:23:14 pm
content: Have a look at that Intel chip on the bottom left

author: coromonadalix
author_rank: Super Contributor
timestamp: March 03, 2023, 08:36:28 pm
content: a simple search, this is an originalp25 versionsure you wont have the tek logo, and crippled settingsthere is some commands on the tds7000 series who create a dump of the cpu bios check in the tds7000 tds7k threadsi use an original intel bios in the tds7254 at our job .... wayyyy better loll i dont care about the tek logo, but the display settings may fuck the lcd screen, be sure to be able to rset the cmos/biosYou have to be sure of the resolution, start with low settings loll

author: newtekuser
author_rank: Frequent Contributor
timestamp: March 03, 2023, 08:39:28 pm
content: Quote from: coromonadalix on March 03, 2023, 08:36:28 pmI do have the vanilla version, but wanted the oem verion with the tek logo.Thanks though!

author: coromonadalix
author_rank: Super Contributor
timestamp: March 03, 2023, 08:42:24 pm
content: you wont get it unless you remove the chip ...... dangerous procedures or search as i wrote for the script

author: newtekuser
author_rank: Frequent Contributor
timestamp: March 03, 2023, 08:44:16 pm
content: Quote from: feedback.loop on March 03, 2023, 08:23:14 pmIs that the BIOS chip???i'm used to seeing them in 8 pin packages.Are there any existing test clips that would attach to it.I know I can desolder it but only as a last resort

author: coromonadalix
author_rank: Super Contributor
timestamp: March 03, 2023, 08:47:30 pm
content: oh forgot this you have uniflash tools who could be able to retrieve it from windows, some AV may hate ithttps://www.rainbow-software.org/uniflash/no clips will work, it is not an spi eeprom ... you have to lift itand yes it is the eepromand you havent seen older 24-26-28 pins dip eeprom i think lollis your mobo dead ?

author: newtekuser
author_rank: Frequent Contributor
timestamp: March 03, 2023, 08:59:23 pm
content: Yeah, seen older eeproms in large dip packages but nothing bigger than 8 pin on modern systemsAnd yes, motherboard is complete writeoff. I suppose I can try hot air to remove the chip and save it for later.I don't intend to destroy my other working motherboard so will leave it at that for now.

author: feedback.loop
author_rank: Frequent Contributor
timestamp: March 04, 2023, 12:52:18 am
content: Why are you talking about EEPROM?BIOS is sitting in a Flash. Must be 4Mbit in this case I suppose.

author: coromonadalix
author_rank: Super Contributor
timestamp: March 04, 2023, 02:02:39 am
content: the board used in Tek stuff have an tek boot image and crippled bios settingssometimes you can't call the bios with the classic DEL or Fxx keyboard, you have to make them loose the clock settings or other thing with killcmos etc ...thats why i live perfectly with an original intel bios, i had to "fiddle" lan settings for visa communicationssure it could be nice to have an original setup ... more problems than solutions lollyou mostly need the drivers ....

author: newtekuser
author_rank: Frequent Contributor
timestamp: March 05, 2023, 06:39:06 am
content: Quote from: feedback.loop on March 03, 2023, 08:23:14 pmI just found a repair article pointing to the same IC:https://hackaday.com/2016/08/20/repairing-14-tektronix-tla5202-logic-analyzers/

author: coromonadalix
author_rank: Super Contributor
timestamp: March 05, 2023, 09:53:20 pm
content: for sure if the capacitors look like this, you have to change them, the problems is : the pcb thickness will dissipate most of the iron heat, and emptying the holes is another problemi use an twist drill with very fine drill bits, this is dangerous, if you are not centered you may break some pcb traces outside and inside the pcb layers ...you need experience to do so

author: newtekuser
author_rank: Frequent Contributor
timestamp: March 10, 2023, 01:38:25 am
content: Quote from: coromonadalix on March 05, 2023, 09:53:20 pmI already broke the original board trying to remove a cap that didn't want to come out. My hakko desolder gun was useless.Luckily I had a replacement board ready and got back in business but now I'm stuck with the OEM bios chip.Funny thing is I had already successfully recapped the very same board model in my TDS5054 scope, guess was lucky.Now I'm trying to dump the ROM off this board and maybe I can flash it onto the replacement board.

author: coromonadalix
author_rank: Super Contributor
timestamp: March 10, 2023, 11:51:51 am
content: And the stupid question is: with the oem version, is everything work ? scope side too ?use crtl alt del, bring the task manager, kill the scope applications, you will revert in pc mode and use the universal bios dump toolhttps://www.majorgeeks.com/files/details/universal_bios_backup_toolkit.htmlMake a bios dump ... done that without problems ?you do it twice with different names to be sure and Uniflash to put it back ??

author: newtekuser
author_rank: Frequent Contributor
timestamp: March 10, 2023, 03:08:33 pm
content: Quote from: coromonadalix on March 10, 2023, 11:51:51 amMy TDS5054 scope is on the original Tektronix motherboard and BIOSThe TLA5202 has the oem/replacement motherboard and BIOS. It still works fine though. The only difference I've noticed is that the Tektronix motherboard had the Intel 100mbps LOM and the replacement board has 1gbit LOM.I did dump the flash from the Tektronix motherboard with the universal dump tool but uniflasher doesn't support the Intel motherboard according to the readme due to locked/protected BIOSThere's the iflash tool but that takes files in .BIO format and my dump is a .ROM file.I could risk renaming it but what doesn't look good is the file size difference: the vanilla BIOS file from Intel is about 600KB and my ROM dump from the TDS5054 original motherboard is 500KB.

author: coromonadalix
author_rank: Super Contributor
timestamp: March 10, 2023, 03:56:21 pm
content: pls correct your wording, where did you take the "vanilla" expressionit's an "Intel" original or "OEM" TEK branded that's allAnd for the network speed difference, i don't think it will make a difference unless you are a speed freak on capturing the scope data on lan interface ?? I do captures on GPIB port for an 7254 lollSome board may have 80-90 % of the same components and have some hardware changes / revisions, seen that in the past, you could create more problems than solutions if you don't find the exact biosyou could take the long road to add the tek image logo in the bios etc ... etc ... and still fuck something up, checksum calculations ...I personally would not even think or even try to mix the models bios .... just for a network hardware speed problem it seems ?Locked ?? Yes in some bios you have flash protection enabled / disabled option. and as i written earlier, you have to crash the bios with say killcmos to make some errors and try to enter the OEM bios ... and you may loose some important settings.Had some hard times with the 7254 after dallas chip failed, and the computer cell battery dropped low, i fucked up the screen configs pretty badly and windows was stubborn as hell to reset itLuckily i flashed the original Intel bios.If it works Don't touch it unless you are stubborn ??Rename the file, if it is not ok it simply shouldn't flashmy 2 centssome readings exampleshttps://forums.mydigitallife.net/threads/intel-d865gbf-board.12139/page-2

author: newtekuser
author_rank: Frequent Contributor
timestamp: March 10, 2023, 04:14:54 pm
content: Quote from: coromonadalix on March 10, 2023, 03:56:21 pmYeah, it's not worth it to me. I'll keep it as it is since it's working fineBtw, the vanilla expression comes from the linux kernel communityIt describes the original kernel maintained by Linus torvalds as opposed to an OEM version that is customized by a Linux vendor such as Canonical, Red Hat etc.

author: coromonadalix
author_rank: Super Contributor
timestamp: March 10, 2023, 11:16:08 pm
content: ok But loll it's a Windows based machine not Linux

author: newtekuser
author_rank: Frequent Contributor
timestamp: March 10, 2023, 11:39:59 pm
content: Quote from: coromonadalix on March 10, 2023, 11:16:08 pmTrue that

author: amyk
author_rank: Super Contributor
timestamp: March 11, 2023, 04:59:05 am
content: Datasheet:https://pdf1.alldatasheet.com/datasheet-pdf/view/66112/INTEL/N82802.htmlThis "FWH" solution was somewhat common around the turn of the century, at the transitional period between parallel and serial BIOS EEPROMs.

author: coromonadalix
author_rank: Super Contributor
timestamp: March 12, 2023, 02:22:43 am
content: you had many intel 865 xxx series, some with more usb ports on the back, etc ... same footprint but different hardware at some point ...

author: newtekuser
author_rank: Frequent Contributor
timestamp: April 07, 2023, 05:57:01 am
content: Ok, so I bit the bullet and bought another Intel D865GLC in working condition off ebay and replaced the original Intel BIOS chip off it with the Tektronix BIOS chip from the broken board and successfully got it to work.I did manage to blow a small cap off the board from using too much air, but luckily I had the "donor" board handy and replaced it.Almost all electrolytic caps are bulged on this board though and my Hakko de-soldering gun is broken, so re-capping will have to wait for another time. Tomorrow will be time to make the TLA "original" again

author: Per Hansson
author_rank: Unknown
timestamp: April 07, 2023, 07:25:02 am
content: Quote from: newtekuser on April 07, 2023, 05:57:01 amWhat, don't run a board with bad capacitors, you run high risk of damaging the switching regulation circuit when doing so!

author: newtekuser
author_rank: Frequent Contributor
timestamp: April 07, 2023, 02:30:40 pm
content: Quote from: Per Hansson on April 07, 2023, 07:25:02 amI know, I'm not using the unit though so this can wait until I get a new heating element for the desoldering gun.