Comments on: Not Common To See Duoyi DY294 Tester Taken Apart And Repair-Part 2

By: Albert van Bemmelen

Albert van Bemmelen — Fri, 17 Apr 2026 14:27:55 +0000

Here is the still working shop seller link Vitaly: https://www.aliexpress.com/store/1246275?spm=a2g0o.order_list.order_list_main.2.383679d2MJ5rMm

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By: Albert van Bemmelen

Albert van Bemmelen — Fri, 17 Apr 2026 13:09:16 +0000

In reply to Anton Borisov.

Hi Anton. All connections to the AME7106 are given in the article. But those QFP44 pin chips failed completely and afterwards only the 2 DIL AME7106 controllers worked fine when they were tested. Why I ordered 10 brandnew CS7106 QFP44 chips instead that all immediately worked splendidly!
See also my answer to Vitaly about what seller on Aliexpress sold them to me.

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By: Albert van Bemmelen

Albert van Bemmelen — Fri, 17 Apr 2026 12:57:39 +0000

Update Vitaliy about your seller question about who sold me 10 good working CS7106GN digital display controllers. It must have been Shop1246275 Store who sold them to me for US $30.00 on 10 Februari 2016. I checked my old item list of which most photos now are removed by Aliexpress after now about 10 years have passed. Do not know if that seller still exists or sells them but maybe just ask?

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By: Albert van Bemmelen

Albert van Bemmelen — Fri, 17 Apr 2026 05:18:03 +0000

In reply to VITALIY PUCHNYEV.

Hi Vitaliy, sorry for my late response but I'm not sure if I still am able to find that information on where I bought those AME7106 LCD controllers after such a long time. Also because in the meantime I did change my inlog account to Aliexpress which makes it harder to find those previous seller list. But if I do I will let you know here when that seller still exists. Best regards.

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By: Anton Borisov

Anton Borisov — Thu, 16 Apr 2026 20:07:20 +0000

Hello, can you help me with the pinout of the AME7106 chip? Can you help me identify which pins are used on the DY294 board and where? I'm using a translator, so please forgive me if this is written incorrectly.

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By: VITALIY PUCHNYEV

VITALIY PUCHNYEV — Thu, 04 Apr 2024 07:28:52 +0000

Hello!
Such a misfortune happened. I applied 12 volts and the display went out.
I want to try changing the microcircuit.
Please give me a link where you bought the microcircuit.
Thank you!

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By: Albert van Bemmelen

Albert van Bemmelen — Sun, 02 Aug 2020 05:53:12 +0000

In reply to Gabriele.

Hi Gabriele, I had not seen your comment until yesterday when a good old friend asked about where he could find my repair article about the DY294 meter. About Diodes D4-D8, if they are not drawn in the circuit they probably were not there in the device. But keep in mind that I did not draw the complete circuit. Almost everything but mainly the most important part of the DY294 circuit to be able to fix most defects and to understand how the device works. It indeed looks like you first need to replace your Q1 transistor to test if that makes your LCD come to life. If it does most likely your 44 pins DMM chip is still fine and you again are a happy working DY294 owner.

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By: ulises aguilar pazzani

ulises aguilar pazzani — Wed, 26 Feb 2020 03:06:23 +0000

grate information Sir Your good

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By: Gabriele

Gabriele — Wed, 18 Jul 2018 21:14:05 +0000

Great article Albert ! I have bought this tester and like you, with no battery in my drawer, I just plug a 6V adapter.
After a minute or so the lcd went blank !(and little smell)
Before google , I take my DUOYI DY294 apart and checked transistor and diode .
seem I'm having d5 to d8 open diode and Q1 with very low junction value (maybe short).
Now , I'm going to desolder component above and give it a test .I have not see D4-D8 in your schematics but I'm searching better.
I'm a HiFi repair technician & this tester will help me to stimulate bjt with different Ib .
Many thanks for your deep investigation . I will report my experience in a few days .

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By: Robert Calk

Robert Calk — Fri, 18 Mar 2016 12:22:47 +0000

In reply to albert van bemmelen.

I wasn't sure that the device would be very sensitive to the voltage, but I didn't want to take a chance. That's why I passed on cheaper wall warts and chose the ones that I bought(not to mention how hard it was to find 6V chargers). Then I checked them to make sure when they arrived in the mail. I've bought 4 of them, and they all check good. I gave one to my friend Michelle for her blood pressure monitor.

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