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JYE Tech DSO150 oscilloscope troubles

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rsjsouza:

--- Quote from: Gyro on April 02, 2019, 07:14:47 pm ---Failed dodgy regulators (78L05) were an issue on the DSO138 too, as were fake TL084s irrc. They've been badly hit by clones of their various models too.

--- End quote ---
That is the cloning game: "just give me the sample", as it was common a decade or two ago (it probably still is).

Sometimes it is very difficult to distinguish a clone: I got a LA2016 (still on the boat) bought from an Aliexpress seller named kingst Official Store, but I then noticed the screenshots do not mention Kingst but Jiankun. They may be from the same people, but how the heck do I know?!?


--- Quote from: Gyro on April 02, 2019, 07:14:47 pm ---It must be hell being a small Chinese manufacturer having to buy jellybean parts on the local market and then getting ripped off by your fellow countrymen.

--- End quote ---
I have seen a lot of these happening in Brasil... In late 1980s there was a brand named "Brokosonic" that ripped some designs from other companies (mostly AM/FM and cassete players). In the early 1990s, "Bakosonic" came to be, ripping off "Brokosonic" designs.

MrElectric:
I'm going to order some replacement components. I'll order the STM32F103CBT6 instead of the STM32F103C8T6 (a B instead of an 8). The STM32F103C8T6 seems to be hard to get today, and from what I can see, the only difference is that the STM32F103CBT6 has more memory (128kB instead of 64kB).

I also found the 1117 in different versions. There's a cheap one, made by Diodes incorporated in Malaysia (ZLDO1117K33TC) and a slightly more expensive one by Texas Instruments (LM1117MPX-3.3/NOPB). I'll order the Texas Instrument one. The pinout is the same for all of these, but I trust TI more than an unknown Malaysian company (though it's probably much better than the chinese one on the PCB (AMS1117 3.3 HK843F)),

I'll order an Uart-USB converter as well, so that I can program the new CPU's.

mikerj:
FWIW Diodes Inc is a large and well respected American semiconductor company, they make a huge range of parts.  No need to avoid their parts (in fact I've had more issues with TI parts than Diodes Inc).

Peabody:
MrElectric, I'm not sure it makes sense cost-wise to order all those parts.  Even if you replace them, it still may not work.  I saw that you have a conversation going on with JYETech on their forum.  I would bet that if you contact them privately, they would send you a new unit at no cost except whatever duty you have to pay.

rsjsouza:
Peabody, I would agree with you if it weren't for the first sentence on MrElectric's post:

Just for fun, I bought a JYE Tech DSO150 oscilloscope from Banggood. I thought it would be a fun soldering project that might be usable sometimes.

I think it is the journey that counts in this case.  :-+

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