Agilent E4407B Repair ,  No Video - Page 1
Forum section: electronics / repair

author: smgvbest
author_rank: Unknown
timestamp: July 07, 2020, 04:49:01 am
content: I recently acquired a E4407B from Alltest for repair. My thanks to them for accepting my offer.I"m going to start a record on my repair of this unit here.The symptoms of this unit is that it powers on, Fan runs. back-light comes on, no display though.I hooked up a monitor and nothing on the VGA port either. I opened up the case to check the Boot Status LEDs on the A4 BoardI have DS1, DS7 and DS13 staying on, This according to the service guide is a firmware checksum error.This could be a bad load of the firmware, it could also be due to bad FLASH SIM. or a chip on the SIM.First thing I will do is pull the A4 board and re-seat the memory modules as well at the Boot EPROM.I will try to try to re-load the firmware if that does not work. This unit does have Option B72 so memory is not a problem in loading firmware.The first issue I have is no 3.5" floppy drive to create the firmware disks nor do I have 9 3.5" floppy disksDid a order with Amazon for a USB Drive and a box of disks. they will be here Wednesday so little progress is likely to happen until thenI will start with that and see if i get any life out of it from from that.what I hope if nothing else is to see the screen come alive prompting for disks. that will at least tell me if display is alive or not.here is the A4 board showing the Boot Status LEDS

author: smgvbest
author_rank: Unknown
timestamp: July 07, 2020, 03:00:52 pm
content: I removed the A4 board this morning and replaced the TimeKeeper/Snaphat, I did a visual inspection of the board and see nothing that stands out, I removed the DIMM/FLASH and cleaned contacts (they were ok, did for good measure) also removed the BOOT EPROM and reseated it and replaced the board. not a big surprise but same symptom shown on the LEDs.I also checked for signs of excessive heat from the chips and could not identify any.I did take some pics of the A4 that I will post later after workI'll create the 3.5 floppies tomorrow after the drive/discs arrive and see if I can flash the firmware.

author: smgvbest
author_rank: Unknown
timestamp: July 08, 2020, 11:38:16 pm
content: So I received the 3.5" USB drive today and it's defective. Returning to Amazon and purchasing a new one from another company.Can not believe I do no have some old PC laying around with a 3.5 drive.Since there's a good chance the flash is bad (hence checksum) i ordered 2 flash memory just in case.Any one in USA got a 3.5" drive that can burn the floppy discs for this by chance?Keysight wants 140 for the 9 discs :O

author: smgvbest
author_rank: Unknown
timestamp: July 09, 2020, 01:30:08 am
content: OK, had a moment of clarity.I have a Infinium with a 3.5" floppy. hooked it to the network and i'm creating DISCs

author: smgvbest
author_rank: Unknown
timestamp: July 11, 2020, 12:04:43 am
content: So, Put in the ESA LOADER Disc and powered up. got the same white screen and no video on the RGB port. The Boot loader did read the disc but no video to know where it was at.I left it for about 20 min then pressed enter and nothing.I remember reading a article that mentioned a bad loader disk and today my replacment 3.5' drive arrived and this one worksI ran a MD5 on the original files and compared the floppies, all where good except the ESA Loader DiscI wrote a new one and check it and it's good.I put it in and powered upThis is very good, this proves Video does work, RGB does work.also Boot Rom uses same Address, Data buffers as the FW Flash, Flash sim and DRAM so I know those are goodI had DS1 flashing steady at 1hz so the heart beat was good.while loading DS7/DS13 where out

author: smgvbest
author_rank: Unknown
timestamp: July 11, 2020, 12:21:28 am
content: Reach the last of the Firmware disc, 5 of 5All disks loaded. I then continued and Firmware updated successfullyI power cycled and DS1/DS7 and DS13 on again.Checksum on firmware flashso again given the buffers look good based on the boot rom working it could be the VPP line on the FLASH is not working so it's not getting programmedcould be a bad flash rom as well. I hope the replacement flash is hear next week.I do want to read out the config eeprom on the back U56 I believe so I have it saved.I'll also go ahead on unsolder the flash and run it thru the TL866II Plus. I can read it out, write it back and see if there is an error. if so I know thats the problem if not. I have more troubleshooting to doI also want to look at that config eeprom as that appears to be where the licenses are stored. hummmmm

author: smgvbest
author_rank: Unknown
timestamp: July 12, 2020, 02:06:43 am
content: Uploading some images of the processor board while I wait

author: smgvbest
author_rank: Unknown
timestamp: July 12, 2020, 02:13:17 am
content: Ever wonder whats under the timekeep snaphat, here you go

author: smgvbest
author_rank: Unknown
timestamp: July 12, 2020, 02:14:32 am
content: Boot Rom Pulled to be reseated and the troublesome Firmware Flash

author: smgvbest
author_rank: Unknown
timestamp: July 16, 2020, 01:19:52 am
content: Still waiting on the Flash Memory to show up so I desoldered the U56 EEPROM and read it out.This is a screen cap of the contents. the Processor Board Model, Serial and the SA Model and Serial are really all thats in hereU56-93C66-SOIC.7z(0.26 kB - downloaded 135 times.)I also dumped the Boot Rom and am attaching it hereU77-29F010-PLCC32-E4404-80123-0453 HS.7z(33.44 kB - downloaded 160 times.)

author: smgvbest
author_rank: Unknown
timestamp: July 16, 2020, 01:30:39 am
content: Everything is pointing to the U74 being bad. so I have gone ahead and desoldered the flashFlash RemovedI just noticed the time stamp on my microscope camera is WAY off

author: smgvbest
author_rank: Unknown
timestamp: July 18, 2020, 02:07:59 am
content: No much to update at this point. Still waiting on parts. I placed an order for a TSOP-56 stencil from chipquick. says it shipped Monday but UPS is still waiting on the package to be turned over.I emailed chipquick, so far no reply from. Not very happy with them at this point.

author: feedback.loop
author_rank: Frequent Contributor
timestamp: July 20, 2020, 06:42:12 am
content: Quote from: smgvbest on July 18, 2020, 02:07:59 amWhy stencil? I would not bother. These packages are easy to solder by hand.

author: capt bullshot
author_rank: Super Contributor
timestamp: July 20, 2020, 07:29:34 am
content: I really appreciate posting text and pictures, thanks.Usually I can't be bothered to watch another repair video.So good luck for your project, and as feedback.loop said, TSOP-56 can easily soldered by hand. Not if you're doing it the first time and don't know the trick:Use enough flux and solder wick to remove shorts.

author: smgvbest
author_rank: Unknown
timestamp: July 21, 2020, 12:43:30 pm
content: Not for very shaky hands. I used to be able to, not so much anymore

author: smgvbest
author_rank: Unknown
timestamp: July 27, 2020, 04:47:13 pm
content: here's an update, the CPU is hard to troubleshoot since you do not have easy access to probe it. i've had to solder short wires at various points to do so and can find no where that looks wrong.i'm wondering if it's simply a failed FW upgrade and its' bricked.That said I did acquire another CPU board to test with and everything comes up and passed all test, align all, done with no issuesI know this is cheating but atleast I know it worksgiven that, the problem is definitely the CPU board. I think what I will try on the board is a full flash erase then try to reprogram it.I still want to fix the board that was in it then probably sell it to get back some of what I paid for the other board.2 things I would like to ask1. Does anyone have the software that was available with the Service Manual?Part Number E4401-90450Part Description: Contact Parts ID ESA-E service doc / SW kitif so contact me via PM please.2. I would love work on hacking the Option Keys. if anyone is willing to share their options information I need your Host ID, Serial Number , Option and License Key to work on it.PM me if you're willing to share privately.I do not want to post this information publicaly.BTW, the Processor JTAG does not look to be brought out, bummer. but it is a socketed thru-hole processor so it may be possible to access JTAG by soldering direct to the pins.I would love to dump all memory spaces, boot, FW Flash, Flash etc to work on the license stuff

author: smgvbest
author_rank: Unknown
timestamp: July 27, 2020, 04:52:24 pm
content: More images

author: smgvbest
author_rank: Unknown
timestamp: July 27, 2020, 04:54:48 pm
content: Only the Power Suite Personalities installedNo LicensesAnd Finally view the 50Mhz Calibration Signal

author: smgvbest
author_rank: Unknown
timestamp: July 29, 2020, 12:42:48 am
content: OK, I put the original board back in and tried to flash it again. i took 3 times to get the loader to load. flashed and rebooted and exact same thing. poohso I went back to the other CPU board and tried something. I did the full flash erase ESC+RETURN+VIEW/TRACE as I turned it on. after an erase a reboot behaves exactly as my issue. same LED Code. WHITE screen, no heartbeat (DS1). hummmmmmafter I flashed this board it came back asking for the power suite. so why isn't the original board???i pulled the FLASH SIMM out of the new board and put into the old board. powered up and same thing but maybe it never flashed the FW???So I powered down and put in the ESA Loader disc, powered up and right into the loader. after 5 discs of the FW I installed the FW and powered down.held my breath and powered up.....Its got a heart beat. then the spash screen, then asking me to install the power suite so in goes 3 discs. finished rebooted andIT'S ALIVEthe old board is working now.I put the old sim back in and same problem occures. there is a issue with the SIMM FLASH.I'm going to replace the flash on the module and try again with it.This to me is major progress.i've verified the old board does workI did a full align and it worked.I'll check this SIMM out but i do have a working old and new board. one will be going up for sale, in the near futureImage of 50Mhz Call signal after Align All, orignal board, flashed with 14.06

author: smgvbest
author_rank: Unknown
timestamp: July 29, 2020, 03:04:40 am
content: I replaced the flash on the simm and still same thing.problem is consistent with this simm module.on a visual check there's nothing wrong that I can see. traces intact. I check each flash for shorts on adjacent pins, as well as continuetity to the pads, all checked good.I'm going to check the caps on it and make sure they are all ok.if i don't see anything that way I'll do a comparison between a working one pin by pin and see if that shows up anything.

author: negativ3
author_rank: Regular Contributor
timestamp: July 29, 2020, 07:51:54 am
content: A very thorough and informative write up. May I ask, which tools do you use for IC read/write?

author: smgvbest
author_rank: Unknown
timestamp: July 30, 2020, 02:02:36 am
content: for the 9366 EEPROM i used the XGecu T56I asked them to add support for the FLASH , it's capable of r/w to it but not supported. they said they would add soonI'd love to read out the FLASH and see if anything was true wrong or was it really bricked.

author: smgvbest
author_rank: Unknown
timestamp: August 01, 2020, 01:00:52 pm
content: Xgecu released 10.29 of the software and added the flash support I requested.I did confirm the flash on the CPU board was bad, I did a multiple Read/Erase/Program/Verify on it and after 1 pass it failed.The flash from the SIMM was OK. But that Simm module still has problems. if its put in I get the same original problem backso any condition where the flash is as an issue results in same behaviorthe board is fixed but that SIMM still causes problemsit's hard to find the SIMMs anywhere and Keysights current price is $506I'm going to compare a known working SIMM to the one not working next and see of there are any differences.

author: smgvbest
author_rank: Unknown
timestamp: August 02, 2020, 08:06:48 pm
content: So I did a comparison of a known good Flash SIMM and the one acting uptable below shows the comparisonAll measurements done from Pin1 (Gnd) to each of the other pinsthe only thing to shows is that the datalines all show a lower resistance but otherwise pins are consistent in my view yet the bad one does not work

author: smgvbest
author_rank: Unknown
timestamp: August 08, 2020, 05:25:41 am
content: While I was doing some other work I mapped out the JTAG PINS to find where you could tap in to the processorthis is what I came up withI dont' know what happened to all my inline photos but I had to go back thru and redo them all which is why everything is showing a update today

author: analogRF
author_rank: Super Contributor
timestamp: February 26, 2021, 03:08:41 pm
content: Quote from: smgvbest on August 02, 2020, 08:06:48 pmSandradid you ever fix the cpu board or the flash module?

author: analogRF
author_rank: Super Contributor
timestamp: February 26, 2021, 03:17:23 pm
content: so replacing U74 did not help, right?what information do you think the U74 holds?did you replace all of the flash chips on the flash module and still it didnt work??

author: perieanuo
author_rank: Frequent Contributor
timestamp: February 26, 2021, 03:35:46 pm
content: Quote from: smgvbest on August 01, 2020, 01:00:52 pmif you got bad fw for main uC, you expect to trick the other chips inside written by the uC with fw loaded from a bad chip???i don't get what you did, you have writen the bad flash in external programmer, put it back in his place and then reflash the SIMM flash?that was the correct steps, but you're unclear

author: smgvbest
author_rank: Unknown
timestamp: February 26, 2021, 10:12:02 pm
content: Quote from: analogRF on February 26, 2021, 03:17:23 pmWhat mine ended up being was bricked. it wasn't a flash issue but a really bad attempt at flashing it apparently give same response code as a bad flash chiponce I did a full clear of flash and memory using the switch method on the cpu board it started reading my floppy escalader disc and then it took the firmware load.

author: analogRF
author_rank: Super Contributor
timestamp: February 26, 2021, 10:15:14 pm
content: so you think the original U74 and the flash SIMM were OK?

author: analogRF
author_rank: Super Contributor
timestamp: March 03, 2021, 12:13:50 am
content: Finally after a couple of month, I found some time to see what is wrong with this E4405B that I gotIt does not boot. The backlight comes on which is pretty dim I think and stays on, fan is running. The floppy light never blinksand I need to pull the plug to power it off.I opened the case and turned it on. All the RED LEDs turn on and stay on (DS7-DS13) and the Green LED (DS1) which is marked as HRT BTstays on and does not blink so no heart beat5V supply is present on the CPU board and I can only check -12V and +15V are present on the front panel probe power connector.There is no place to check the power supply voltages, right?according to the SM, DS7-DS13 all on means "start of the test" so it does not even get to bootrom checksum apparently.anybody has any idea? any hint?EDIT: the unit had never been opened since its last Cal. all seals were absolutely intact. So something failed on its own and I am the first one in

author: analogRF
author_rank: Super Contributor
timestamp: March 03, 2021, 07:49:08 pm
content: CPU has clock and is not in RESET...so I am about to run out of ideas... any suggestions?working on the CPU board is a pain in the a** and pretty much impossible for the most parts, so nothing much can be done in terms of measurementsI tried to figure out what kind of connectors attach it to the motherboard and tried to findjumper ribbons with those type of connectors to bring out the CPU board but they cannot be found...each has 100 pins

author: analogRF
author_rank: Super Contributor
timestamp: March 05, 2021, 12:06:28 pm
content: Does anybody know what exactly means when all LEDs are ON and stay on? even DS1 (HRT BT)?can it be the CPU is dead?? I have seen many many non booting instruments but dead CPU I have never encountered.I think it must be something else...

author: smgvbest
author_rank: Unknown
timestamp: May 05, 2021, 11:05:43 pm
content: Sorry I am way late on this. been having a bad time with my back. just has a SCS implant done so hopefuly life will be getting better soonAll the LEDs on is the start of the Self Test. So it's' not getting past that pointthe Service Manual has this starting on Pg37 with some other basic tips.what brought mine back to life with a full clear of FLASH and SRAM memory.But mine was in a different state than yoursAgain sorry I did not reply soonerBTW, you can supply power to the card outside the machine and hook up the serial port on the card to see it booting. allows for testing outside the SAonce it's' past the all LEDs out point and DS1 flashing you can put it back inSandra