New Zoyi multimeter+oscilloscopes - ZT-70xS, up to 50MHz/250MSps (nov 2022)

[indman]

Please don't insult others, a grown man with three children, two wives and four mistresses has the right to buy and play with toys!

Ok! Two wives and four mistresses is a serious argument!

[koshchall]

Hello everyone,

I have a ZOYI ZT-703S multimeter that I purchased about 3-4 months ago, and recently, the display has started having serious issues. The problems include:

The screen has lost sharpness, making it difficult to read measurements.
The resolution appears to have dropped, with text and numbers looking blurry.
Previous display elements leave ghosting effects, meaning that old readings are still faintly visible even after the screen updates.
Despite this, the multimeter's functions and measurements still work correctly. Based on my experience, this issue might be caused by a faulty LCD panel or a problem with the graphics processor.

Has anyone else experienced a similar issue with this model? If so, was there a way to fix it? I’m considering contacting the seller for warranty service, but I’d like to know if there are any possible DIY fixes before going through that process.

Any help or advice would be greatly appreciated!

[Grandchuck]

Bad zebra strip connection is my guess.

[Altair8800]

I'll advise try to return the multimeter/oscilloscope.  If you open it up and try to fix it, you might void the warrantee (why take chance).  Maybe they will give you a new unit (might have to ship it back).

From the manual...

Limited Warranty and Scope of Rights and
Responsibilities
This product is eligible for a one-year
warranty from the date of purchase.
This warranty does not cover blown fuses,
damage to general accessories, or damage
caused by accidents, negligence, misuse,
modifications, pollution, and abnormal
operating environments.

Note: If there is a situation of freezing or
crashing during use, please restart.

Assume this might not be fun experience...  Let us know how things goes.  Good luck...

[mebel]

Bad zebra strip connection is my guess.

There's no zebra strip, it has flex connection.

[Astur_TorQue]

I'll advise try to return the multimeter/oscilloscope.  If you open it up and try to fix it, you might void the warrantee (why take chance).  Maybe they will give you a new unit (might have to ship it back).

From the manual...

Limited Warranty and Scope of Rights and
Responsibilities
This product is eligible for a one-year
warranty from the date of purchase.
This warranty does not cover blown fuses,
damage to general accessories, or damage
caused by accidents, negligence, misuse,
modifications, pollution, and abnormal
operating environments.

Note: If there is a situation of freezing or
crashing during use, please restart.

Assume this might not be fun experience...  Let us know how things goes.  Good luck...

Warranty in aliexpress...

Good joke!

It took me months to claim a warranty for a mobile and the most i could get was a 80 € discount

[mebel]

Warranty in aliexpress...

Good joke!

It took me months to claim a warranty for a mobile and the most i could get was a 80 € discount

It's seller dependent. I had a problem with T3a soldering station and the seller send me a handle and after that  a new motherboard

[efimiv.a1969]

Hello, I had: when switching from a multimeter to an oscilloscope and vice versa, sometimes half the screen was displayed, the other half was dark. I dismantled, reconnected the train on the display, and the problem disappeared.

[kwass]

Hello, I had: when switching from a multimeter to an oscilloscope and vice versa, sometimes half the screen was displayed, the other half was dark. I dismantled, reconnected the train on the display, and the problem disappeared.

I have the exact same issue.  I'll give your fix a try, thank you!!!

[Luca_Techy]

Hi all,
   I recently got a 703s to add to my "collection" of low cost handhelds - however even after the latest upgrade (V142) mine does not display the correct trigger point in Normal or single trigger mode under the 500ns time div setting. At 500ns and above it works as expected, waveform is displayed correctly at the trigger level but under it's somewhere lost far on the "left" of the scope window and you have to scroll a lot to find it taking ages. I thought this was an old bug which had been fixed, but apparently not - can anyone confirm this?
Thanks!

[OLderDan]

mine only does this if the signal is less than 84kHz.

https://youtube.com/shorts/PKDjzDo-SVw?feature=share

I uploaded a short clip to youtube showing it in 250ns losing trigger below 84kHz, but have no idea how to include it in the post.

[siealex]

The screen has lost sharpness, making it difficult to read measurements.
The resolution appears to have dropped, with text and numbers looking blurry.
Previous display elements leave ghosting effects, meaning that old readings are still faintly visible even after the screen updates.

This look like absence of one of the power supply voltages at the LCD panel.

[EU1]

Warranty in aliexpress...

Good joke!

It took me months to claim a warranty for a mobile and the most i could get was a 80 € discount

Contact the manufacturer or their official store directly.
In recent years, I’ve had positive experiences with Chinese manufacturers like Owon, Zotek, and UNI-T.

[Luca_Techy]

A scope that doesn't trigger properly in any situation is rather useless IMHO.  I hope they will release an update else it will just be another paperweight for my use cases. I have a cheapo "ZEEWEI" which cost half and works rather well unexpectedly.
FYI if I select 250ns/div and trigger in normal or single, I have to scroll back to the left (pressing the right arrow to move the current trigger point to the right) about 3.2ms to see center the correct trigger point. If I leave it there and do another single shot it will remain in the center (shifted). As soon as I try to move left or right it will disappear, and when I press OK to re-center I will find it centered! Certainly a bug or two here to fix.
Brief video showing it: https://youtube.com/shorts/XRGxF6oBQFs

[uncle_sem]

i just update but doesn't tested.
language : English/China/Russian.

Something strange is happening
Today I tried to update the firmware, and I encountered the fact that there is less free space on the internal storage than the size of the firmware. At the same time, there are no files there at all, only firmware folder

[csuhi17]

Something strange is happening
Today I tried to update the firmware, and I encountered the fact that there is less free space on the internal storage than the size of the firmware. At the same time, there are no files there at all, only firmware folder

for me after one of the previous updates it contained several files and folders, the names were not consistent, they contained random characters.
I could not delete, modify or open them.
Now after the last update they disappeared and only a few folders with meaningful names remained.
According to disk management I have 10 MB of free space out of 14 MB.

I can't help you with what you should do in your situation.

[indman]

uncle_sem https://www.eevblog.com/forum/testgear/new-zoyi-multimeteroscilloscopes-zt-70xs-up-to-50mhz250msps-(nov-2022)/msg5632455/#msg5632455

[chebo]

Maybe someone has tried it... Is it possible to install old firmware over the new one?

[uncle_sem]

cant find "format" option in 1.4.2 firmware. now in the place where the "format" was, there is "FFT"

[uncle_sem]

Maybe someone has tried it... Is it possible to install old firmware over the new one?

YES, and this is the way I uploaded latest firmware version - first I uploaded 1.3.9 firmware, fortunately it fits and have format option, then I formatted it, and finally uploaded new firmware

[indman]

sp3rat , Read the previous page carefully to avoid repeating the same questions.
https://www.eevblog.com/forum/testgear/new-zoyi-multimeteroscilloscopes-zt-70xs-up-to-50mhz250msps-(nov-2022)/msg5833205/#msg5833205

[koshchall]

ADDENDUM...

I thank everyone who tried to help with advice on the repair. I didn’t want to attempt a repair, but I managed to start a return process – I need to return the device, and I should receive a full refund for the device and shipping costs. I say 'should' because so far, the process is going well for me.
I plan to buy a similar device again, but I’m not sure whether to buy the ZT-703S again or another similar device, or maybe even buy 2 devices – one multimeter and one oscilloscope.

I’m asking ZOYI device owners, especially owners of the ZT702S or ZT703S, if they’ve had any issues with device malfunctions (other than software errors).

Thanks for your responses.

Hello everyone,

I have a ZOYI ZT-703S multimeter that I purchased about 3-4 months ago, and recently, the display has started having serious issues. The problems include:

The screen has lost sharpness, making it difficult to read measurements.
The resolution appears to have dropped, with text and numbers looking blurry.
Previous display elements leave ghosting effects, meaning that old readings are still faintly visible even after the screen updates.
Despite this, the multimeter's functions and measurements still work correctly. Based on my experience, this issue might be caused by a faulty LCD panel or a problem with the graphics processor.

Has anyone else experienced a similar issue with this model? If so, was there a way to fix it? I’m considering contacting the seller for warranty service, but I’d like to know if there are any possible DIY fixes before going through that process.

Any help or advice would be greatly appreciated!

[rsjsouza]

I’m asking ZOYI device owners, especially owners of the ZT702S or ZT703S, if they’ve had any issues with device malfunctions (other than software errors).

I personally did not have problems with my ZT-702S yet, but one of my channel subscribers reported that all multimeter functions on his 702 had failed - the oscilloscope still works fine.

I provided some tips to him but haven't heard back. Given his unit was bought a while ago, he has no recourse of return.

Unfortunately, uneven quality control is something that is common in cheap products, thus what works for one might not work for the next buyer.

[cncjerry]

Hi all, I've read thru all of the notes, sounds like these models have their issues.  I have quite a few scopes and have seen these hand-helds for a while.  Recently the Fnirsi 2C53T caught my eye.  I want something small that I can use on my desk to align digital tape decks without dragging out a larger scope.  I use my Siglent 1104XE with the mods, but even that is too large.  I want something that I can set on the tape deck and do very uncomplicated tests.  I just need two channels, one for triggering and the other for viewing RF below 20Mhz.  Having that integrated in a volt meter of some accuracy would be handy.  So are they complete junk or do they function ok within limits?  And the 703s seems more popular than the 2C53T, any comments comparing the two?

Thanks

Jerry

[tunk]

Maybe not the 2C53T, but Fnirsi has a history of being economical with the specs.
There's also many others:
https://www.eevblog.com/forum/testgear/portable-oscilloscopes-list/