**FIXED** 34461A blown components need values.

[ParkAndFarm]

Hi Guys, name is Chad and I should have started to hang out here long ago.

whats going on is i had this keysight 344614 meter since it came out and it has worked perfect until about a week ago. motherboard has Agilent Rev 4 marking.
Discovered a blown U303 ADG1208 replaced that. still have a 2 components right near the transformer that I cannot read from physical damage and could not pull any numbers from Daves teardown pictures.
Contacted Keysight and they will not provide schematics for this.

can someone take a good picture of this section or provide the values? picture attached of the area on mine.

the diode is open, L1002 and CR1007 are both bubbled.  IC 5173G gets Flamin' hot.

turned on after I replaced ADG1208 and it looked like meter readings came back but turned it off right away when the the glow showed up on the flir gun hence discovering the missed damage area..

Thank you kindly hope to find these values rather than doing a hack / reverse engineering guess.

Chad.

****update 06-15** the cause of the destruction was my fault. I had the front lead set tied to one voltage and a back panel high voltage probe under load with its ground clamped to the wrong unit under test. had the high voltage probe under a 20kv and switched to the back panel HV probe without removing the front panel active B+ reading on top of that.

[wraper]

IC is CS5173G, it might also heat because Schottky diode or the load is shorted. https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/6146/CS5171-73_Rev27_May2023.pdf

[wraper]

Diode B3V is MBR0530 https://lv.mouser.com/datasheet/2/308/1/MBR0530T1_D-2315063.pdf
L1002 most likely is the same as L1004 EDIT: Nope, it's 2.2uH.

[wraper]

I opened mine, CR1007 most likely is BAV70.

[ParkAndFarm]

thank you for all this!. that a pretty good solid start..

decided to remove all the 3 confirmed bad components and powered up .
the 5173G still got super hot.. removed that powered up same error..
also removed the 5174G that should be tied to that as I plan to replace. that one would climb to 200deg F then rapidly dip to 120 right on power up. i assume that one is bad too or maybe thats normal startup with the stuff removed?

[wraper]

also removed the 5174G that should be tied to that as I plan to replace. that one would climb to 200deg F then rapidly dip to 120 right on power up. i assume that one is bad too or maybe thats normal startup with the stuff removed?

It's a separate converter, you could have just checked if there is output voltage.

[ParkAndFarm]

you are right. I should have done that first I wanted to get a profile see if it reacted dif on boot with the confirmed bad and 1 suspect first..

will get some key test point measurements likely tonight, with that still in too.

[ParkAndFarm]

would this be ok for the inductor you think?

https://www.newark.com/monolithic-power-systems-mps/mpl-at2010-2r2/power-inductor-2-2uh-shielded/dp/80AH9727?ost=80ah9727

[wraper]

I looks like it's just for some filtering, and traces are quite thin, so should be fine I think. Although it doesn't need to be low profile and original looked thicker.

[ParkAndFarm]

There we go.. all rails good except one.
hopefully repairing that section brings everything back up online..
so do you think the rail blew my other ADG1208 or did the ADG blow the rail?

+16.8v supply missing to the ADG1208

pin2 no supply. pin 3active -16.4

[ParkAndFarm]

Did you read BAV70 of the CR1007 or is the text hard to pickup off it?
usually a camera picture will pick it up better. or are you trying to cross the code ? thank you.

[ParkAndFarm]

I am sorry,
could you please pull one more number for me!

on the component side Q1003..  sadly also bad!

have a pic of area

[wraper]

Did you read BAV70 of the CR1007 or is the text hard to pickup off it?
usually a camera picture will pick it up better. or are you trying to cross the code ? thank you.

It's marked with A4, dot under 4 and what seems to be H at 90^o. Marking suggests BAV70 and it measured like it should be.

[wraper]

Seems to be P channel MOSFET. Could not find what exactly. Device code seems to be 7D as two next symbols seem to be different on your picture.

[wraper]

It's SI2307BDS from Vishay
https://www.lcsc.com/product-detail/MOSFETs_Vishay-Intertech-SI2307BDS-T1-E3_C31712.html
https://www.lcsc.com/datasheet/lcsc_datasheet_1809172048_Vishay-Intertech-SI2307BDS-T1-E3_C31712.pdf

[ParkAndFarm]

absolutely the best thank you!.

i will report what comes of it!

[wraper]

Did you read BAV70 of the CR1007 or is the text hard to pickup off it?
usually a camera picture will pick it up better. or are you trying to cross the code ? thank you.

It's marked with A4, dot under 4 and what seems to be H at 90^o. Marking suggests BAV70 and it measured like it should be.

Exactly like this from onsemi https://www.lcsc.com/product-detail/Switching-Diode_onsemi-BAV70LT1G_C82479.html

[ParkAndFarm]

got everything in and the 16.8v rail to the ADG1208 multiplexeri is loaded down.. about 9v. the 5173G is super hot and obviously not running correctly

L1001 coilcraft was found to be shorted. ordered one of those expecting by Friday. it hits pin 8of the 5173G

[TrickyNekro]

Did L1001 have burn marks because it is an inductor and to a multimeter should look shorted ( did you read the value with an LCR? ).

Can you look with a scope if the filtering works or at least how your power rail looks? This whole scenario kinda smells like cracked, but
not totally shorted ceramic capacitor. Maybe you can locate the short with a multimeter ( zero it out and look for the region that the resistance
is becoming smaller and smaller, take care with capacitor loading ).

Since you have a have a thermal camera, try to look for a shorted capacitor.

Also make sure that the power to the CS5173G is correct ( which from what you´ve written seen that you have done ). If the power to the
boost converter is 9 - 11V and it is outputting 9V, given a diode drop or two, and the converter gets hot, that makes a very strong case for
the converter being bad. Just because it has thermal shutdown doesn´t mean that the silicon inside has survived the short.

Edit: Get the scope and try to measure what pin 8 of the CS5173G does. Does it switch?

[ParkAndFarm]

its totally toast.. reading 4uH at 1khz.. my leads read about 2.7 shorted together.
L1003 near the bad one of course reads 22uH as it should. also a burn mark the bad one case.
you can see it in my picture above its very subtle

[ParkAndFarm]

Great success!.

Replaced the blown U303 ADG1208YRZ Multiplexer along with the 4 highlighted components in the power supply + L1001 inductor [LPR4012-223DMRC] and everything is cherry again! yeah!!
thanks you for the help wraper aiding in making this happen!


**update 06-15** the cause of the destruction was my fault. I had the front lead set tied to one voltage and a back panel high voltage probe under load with its ground clamped to the wrong unit under test. had the high voltage probe under a 20kv and switched to the back panel HV probe without removing the front panel active B+ reading on top of that.

**ran it overnight everything seems to running perfectly yet along with spot on measurements! yeahhh!