Author Topic: SDG1025 overvoltage and relay malfunction repair  (Read 1836 times)

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Offline sourcecharge

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SDG1025 overvoltage and relay malfunction repair
« on: September 22, 2018, 04:11:04 pm »
10/4/18 UPdate: I will be replacing all analog ICs and semiconductors on the front and back of the old and new versions of the MF and I have completed the list for part ordering.

Total cost for replacing all parts on the top side listed for 1 FG was about $110.00 including shipping.


-------------------------------------------------------------------------------------------------------------------------------


Ok, so I OV'd my CH1 of SDG1025 FG.  :palm:

It's 280 dollars to have it repaired at siglent (including shipping), or 319 for a new one.

I tracked it down to a bad THS3095 (U19) which was about a 10 dollar part, and a bad 25 ohm resistor (R154) from a secondary opamp CLC1606 (U46).  [Side note: the new SDG1025 now use a LMH6702 as U46 and U58 while the rest of the CLC1606 (not available) have been replace as OPA695 (U37,U40,U52,U51,U48, and U38) ]

I replaced it, and Ch1 worked perfectly, until I made sure Ch2 worked too as well.

Ch2 was outputing lower voltages so I did a self calibration.

Then both Ch1 and Ch2 didn't want to work at all.

I opened it back up and found a solder ball had somehow got flung between two pins of the opamp 5166iSZ (U59).

It was between the 5V and the output of the op amp.  |O

I replace U59, and both channels were still not working.

After some testing, I found the relays don't work.

There are 2x 5V power points on the FG, and they are not connected together.

The relays (and other components) operate on one 5V (VCC5V) while all of the analog op amps from Ch1 and Ch2 operate on the other (+5V).

The 2 ICs that control the relays are UN2003A (U74 and U71, which are 8 transistor/buffer inverters per package), and those are controlled by 2x 74ahct595 which have the markings on the IC of HB595 (U36 and U39, which are serial to 8 parallel registers with the first register feeding the second with the last inverted parrallel output.)  All of these ICs run off of the VCC5V output.

Testing the input to the series data input of the first register has found that the signal is high and does not change with a repeatable sequence when the Ch1 or Ch2 output buttons are pushed. (although I can still hear one of the relays switching)

The series data input of the first register leads to the fat ribbon wire to the interface panel, and is leading to both Ch push buttons.

The other side of the capacitive push buttons leads to the ribbon cable interface of the LCD ribbon where, there is a second pin on the interface that is shorted when ch2 button is pushed.  This pin leads back down through the fat ribbon cable back the mother board to the 6 pin IC.  When the markings on the IC is read from the orientation of the three pins as being the bottom, the package has the marking of:

z16B

It's labeled U60o on the block diagram schematic

The new version is marked:

z166

I've done searches on these parts, and I can't find any information.

If anyone has any ideas or knows what this IC is, or even possible knows what's wrong with this FG, I would be very greatful for your help.  I'm in it for the long haul, and I am even looking at replacing the FPGA or the controller if need be but I would like to exhaust all other possiblities first.

Here is what I have so far relating to part numbers an their block diagram number that I'm also including.

---------------------------SDG1025------------------------

DAC904E
28 pin
U54,U45
Marking on part:
DAC904E
2ACLD9X

NEW VERSION
B3GA4.5Z
Relay 8pin
RAL14,RAL15,RAL16,RAL11,RAL18,RAL9,RAL10,RAL19,RAL20,RAL8,RAL12,RAL21,RAL13
Marking on part:
B3GA4.5Z


OLD VERSION
UD2-4.5NU (not available)
Relay 8pin
RAL14,RAL15,RAL16,RAL11,RAL18,RAL9,RAL10,RAL19,RAL20,RAL8,RAL12,RAL21,RAL13
Marking on part:
NEC JAPAN
UD2-4. 5NU
3A1312F

sn74ahct595
16 pin (serial to parallel registers that control the transistors that control the relays)
U36,U39
Marking on part:
(TI insignia)
HB595
34KG4
AXGL

ULN2003A
16 pin (transistors that control the relays)
U74,U71
Marking on part:
(TI insignia)
UN2003A
34AG3
P05M

NC7WZ16
6 pin (buffer)
SC-70-6
U60o
Marking on part:
z16B

New
NC7WZ16
6 pin  (buffer)
SC-70-6
U60o
Marking on part:
z166


------------------------------Overvoltage and Relay Malfunction IC/Semiconductor Replacement List-------------------------------------
 
OLD version
BAV99
3pin DIODE ARRAY  SOT-23
Q3,Q4,QA8,QA9,QA13,QA5,QA10,Q19,Q27
Marking on part:
A7
(sideways)x

NEW version
BAV99
3pin DIODE ARRAY  SOT-23
QA8,QA9,QA13,QA5,QA10,Q19,Q27,[Q3,Q4,Q6,Q7]on backside of MB
Marking on part:
A7
(sideways)x

THS3095
8pin OPAMP
U19
Marking on part:
3095
TI 18Z
CRZ4G3

NEW version
OPA695
8pin
U37,U40,U52,U51,U48,U38
Marking on part:
TI OPA
695
695YV

NEW version
LMH6702
8pin
U46,U58
Marking on part:
5A5C
LMH67
02MA
(note: OPA 695 looks like it has better performance than the LMH6702, and it was substituted to save money)

OLD VERSION
CLC1606 (not available)
8pin
U46,U58,U37,U40,U52,U51,U48,U38
Marking on part:
CLC1606
1239
Z1

5166iSZ
8 pin
U59
Marking on part:
5166iSZ
B149W7
(Elantec marking)

OLD VERSION
TL072C
8 pin
U104,U101
Marking on part:
TL072C
32k
AT88T4

NEW VERSION
TL072C
8 pin
U104,U101, [U108, U110]on backside of MB
Marking on part:
TL072C
32k
AT88T4

AQY214S
4pin Relay
UA50
Marking on part:
COSMO
Y214S
M27

ISL28210
8 pin
U103,U91,U106,U102, U89
Marking on part:
28210
FBZ -C
B308FP

NEW version
8512A
8 pin
U103,U91,U106,U102, U89
Marking on part:
(sold box with cut out of right pointing equallateral triangle), (# or $$ symbol)
1652
7910
(note: ISL28210 looks like it has better performance than the 8512A, and it was substituted to save money)

OLD VERSION
74HC4051
16 pin
U47,U42
Marking on part:
(NXP insignia)
74HC4051D
L2K3C806
UnD1314D

NEW VERSION
74HC4051
16 pin
U47,U42, [U53]on backside of MB
Marking on part:
(NXP insignia)
74HC4051D
L2K3C806
UnD1314D

VCA822
14 pin
U26,U25
Marking on part:
(TI insignia)
24CSGEK
VCA822ID G4

ADCMP562
20 pin
U35
Marking on part:
2552125.1
ADCMP
562BRQ

adc121s101
6 pin
U61_1
Marking on part:
X01C

SBC846BLT3G
SOT-23
3pin
QA4,QA3,QA16
Marking on part:
1B 4
(sideways)4

OPA727
8 pin
U49
Marking on part:
AUE
32C6

REF3030
SOT-23
3pin
U73
Marking on part:
R30F

DAC8580
16 pin
Q27
Marking on part:
(TI insignia)
D85801
09T
A97R

MMBTH10LT1
sot23-3
QA2
Marking on part:
3EM (sideways 4)

PMBFJ309
sot23-3
QA1
Marking on part:
49W (sideways 29)
 
NEW VERSION
LM339
14pin
[U27]on backside of MB


------------------------------------ONLY ON BACK SIDE OF NEW VERSION SDG 1025-----------------------------

LM339
14pin
U27

TL072C
8pin
U108, U110

74HC4051D
16pin
U53

BAV99
3pin DIODE ARRAY  SOT-23
Q3,Q4,Q6,Q7
Marking on part:
A7
(sideways)x

Please correct me if you think I got one of these wrong to increase knowledge of SDG1000 series repair.

Thanks  :-+
« Last Edit: October 15, 2018, 05:25:06 am by sourcecharge »
 

Online tautech

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Re: SDG1025 overvoltage and relay malfunction repair
« Reply #1 on: September 23, 2018, 10:22:42 am »
Sorry I don't have anything useful to help you other than this other recent thread:
https://www.eevblog.com/forum/repair/siglent-sdg-1025-schematic-diagram-(or-what-is-the-u63-chip)/

Follow the links and you might find some info to help.
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Offline sourcecharge

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Re: SDG1025 overvoltage and relay malfunction repair
« Reply #2 on: September 23, 2018, 11:33:47 am »
Sorry I don't have anything useful to help you other than this other recent thread:
https://www.eevblog.com/forum/repair/siglent-sdg-1025-schematic-diagram-(or-what-is-the-u63-chip)/

Follow the links and you might find some info to help.

Thanks, and I have read that thread all the way through.  It has alot of good info.

I think I figured out U60o..

It's a dual buffer, most likely this one.

NC7WZ16 (package: SC-70-6)

I have tested signals from and to the pinouts and it seems to be correct.

The inputs of the dual buffers are conneted together and the signal in and out look the same but they do not look like the series input of the register.  The inputs of the dual buffer IC is connected to the BIG CHIP IN THE BACK (ADS something or other)...... :-- .....not good...

I remeasured the series register input and I found it was an inverted signal that was giving a repetetive bite.  Not sure if that matters but the input to those buffers looks like 2 inductor ringing pulses.  I would think that the signal to the bufers from a uC would be level pulses, not rung down logic pulses...I wonder if that chip stores the firmware and if not maybe it can be replaced?

IDK :-//  More investigating is required.
 

Offline sourcecharge

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Re: SDG1025 overvoltage and relay malfunction repair
« Reply #3 on: October 03, 2018, 02:11:43 am »
So, I've tested some more and found that TP 15 and 16 are both doing some interesting things like someone may have already figured out what went wrong.

https://www.eevblog.com/forum/testgear/the-sdg1000-and-sdg800-thread/msg787268/#msg787268

Although I do not have exactly the same problem, and with the relays too cycling, I've decided to simply replace ALL of the analog and digital ICs that are connected to the +5V output.

I have updated the list above for most of the ICs including the small sot23 ics, and the only ICs on the analog side that I do not plan on changing are the 2 big DACs because they seem to be doing their job and they are not connected to the analogs +5V output. 

The only ICs that I still need to find are:

QA1
UNKNOWN
sot23-3
Marking on part:
49W (sideways 29)

After this one ICs is identified, I can order all of the parts and start replacing all of the ICs on this FG.

Anyone have any Ideas on these parts?  I've done extensive searches already.  I've come here because I have run out of ideas.

Thanks for any help you can give.

EDIT:

AUE 32c6 = opa727

parts list updated
« Last Edit: October 03, 2018, 03:34:55 pm by sourcecharge »
 

Offline sourcecharge

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Re: SDG1025 overvoltage and relay malfunction repair
« Reply #4 on: October 03, 2018, 03:42:00 pm »
So, I just figured out what AUE 32c6 was, as it was the TI OPA727 op amp.

The very last unidentified IC or semiconductor left on the (top) analog side for the SDG1025 is labeled:

49W (with a sidways) 29

I'm thinking its a transistor, but I can't find it listed under any smd code listings.

Anyone?  :-//

Here is a picture of the part:

https://sigrok.org/wiki/File:Siglent_sdg1010_analog_cosmo_y214s.jpg
« Last Edit: October 03, 2018, 06:04:03 pm by sourcecharge »
 

Offline sourcecharge

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Re: SDG1025 overvoltage and relay malfunction repair
« Reply #5 on: October 04, 2018, 04:16:23 am »
So, I just figured out what AUE 32c6 was, as it was the TI OPA727 op amp.

The very last unidentified IC or semiconductor left on the (top) analog side for the SDG1025 is labeled:

49W (with a sidways) 29

I'm thinking its a transistor, but I can't find it listed under any smd code listings.

Anyone?  :-//

Here is a picture of the part:

https://sigrok.org/wiki/File:Siglent_sdg1010_analog_cosmo_y214s.jpg

I found it!

it's:

PMBFJ309

Updating parts list above   :-+

Now I am going to replace all the analog ICs for this and hope that it works.

I have found that the relays click twice when turned on on the old version, but the new version only clicks once.  I'm not sure if this is a problem with the digital side, but I'm hoping that it will either solve itself when all of these chips get changed, or it doesn't really matter, but for what I have found is that the new version and the old version serial data in and clocks to the ICs that control the relays are very close. So, I'm thinking that there might be a different reason why the relays are cycling other than the digial input and the control ICs of the relays.  Maybe the self calibration caused it, and when the ICs are changed, the self calibration will solve it.  IDK...

Wish me luck
 

Offline sourcecharge

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Re: SDG1025 overvoltage and relay malfunction repair
« Reply #6 on: October 04, 2018, 04:25:31 pm »
So I just took the MB out of the new version SDG1025, (did I mention that I OV'd it too about a month ago? :palm:) and I was going to start taking off all of the ICs that I intended to replace on both MBs.

On the back of the new version of the SDG1025, I found 4 extra ICs and some of the sot23  A7 doides were put on this side instead.

I'm going to update the parts list and since it's actually a new pcb layout, I have not taken a picture of it yet but I will soon.
 

Online tautech

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Re: SDG1025 overvoltage and relay malfunction repair
« Reply #7 on: October 04, 2018, 04:54:44 pm »
Other than the last 4 digits in the SN# there's indication of the build date and HW revision so it might be useful to show those #'s with respect to the PCB picture.
In early products the build date was easy to determine but not so much now as the SN# contains mostly lettering except the last 4 digits, the SN# of that HW version.
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Offline sourcecharge

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Re: SDG1025 overvoltage and relay malfunction repair
« Reply #8 on: October 04, 2018, 05:04:37 pm »
Other than the last 4 digits in the SN# there's indication of the build date and HW revision so it might be useful to show those #'s with respect to the PCB picture.
In early products the build date was easy to determine but not so much now as the SN# contains mostly lettering except the last 4 digits, the SN# of that HW version.

It might be easier just to explain how the SN# are used to date the production with this unit for the old and new versions instead?

I could look and just post the production dates?

 

Online tautech

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Re: SDG1025 overvoltage and relay malfunction repair
« Reply #9 on: October 04, 2018, 06:02:20 pm »
Other than the last 4 digits in the SN# there's indication of the build date and HW revision so it might be useful to show those #'s with respect to the PCB picture.
In early products the build date was easy to determine but not so much now as the SN# contains mostly lettering except the last 4 digits, the SN# of that HW version.

It might be easier just to explain how the SN# are used to date the production with this unit for the old and new versions instead?

I could look and just post the production dates?
Like I said, it's not so easy now.
As some example here's the SN# from a recent production DSO built a couple of months ago: SDS1ECDQ2R****.
SDS1E is the model, it seems CD is the HW version and Q2 indicates 2nd quarter production but your guess would be as good as mine. Is R production year, maybe.
As a comparison, a SDS1kCML scope sold late in 2015: SDS100P215****, production 2nd quarter 2015.

So yes the product SN# coding has changed some.
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Offline sourcecharge

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Re: SDG1025 overvoltage and relay malfunction repair
« Reply #10 on: October 04, 2018, 08:03:34 pm »
Using your logic on the older one I got, its 3rd quarter 2013.

The newer one has "Q1R" as the date code...so good luck on that, but I bought it this year.

 

Offline sourcecharge

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Re: SDG1025 overvoltage and relay malfunction repair
« Reply #11 on: October 15, 2018, 03:19:12 am »
Well, I got done replacing all of those chips.

Both FG are now working 100%

I am very happy with the results.

 :-+

Due to the lack of interest, I'm not going to bother uploading the pics of the bottom of the new version mother board.

Now I've got alot of soic op amps that I need to test so that I can use them in making other things.
 

Offline TheSteve

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Re: SDG1025 overvoltage and relay malfunction repair
« Reply #12 on: October 15, 2018, 03:35:17 am »
Congrats on the repair!
I'm sure down the road others will benefit from you sharing the repair and the part numbers.
VE7FM
 

Offline sourcecharge

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Re: SDG1025 overvoltage and relay malfunction repair
« Reply #13 on: October 15, 2018, 05:22:34 am »
Thanks, and I do come here often so if anyone has questions about my repair, I have pics but  :-// no interest here I guess.
 

Online tautech

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Re: SDG1025 overvoltage and relay malfunction repair
« Reply #14 on: October 15, 2018, 06:43:51 am »
Thanks, and I do come here often so if anyone has questions about my repair, I have pics but  :-// no interest here I guess.
Just as TheSteve has said, others will benefit from this thread and any info, pics included that you can share with us.
Your repair would have been much easier if you started with the info you have learnt.
Please share.
TIA.
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