HarryA

You need to supply schematic diagrams for the two circuits. If you need help with creating schematics ask.

Huh? Technological Arts ?

The Mega 2560 has 54 digital I/O pins plus 16 analog pins for a total of 70. You lose 2 pins for the display for either the PC display or LCD. You can have speech on the PC for free. You may need a larger LCD for numerous pins. Mapping the Mega pin numbers to the cable pin numbers would have to be predetermined. Some connectors use alpha characters (A - Z) I gather.

If it interest you, I could program the micro-controller for you. That would give you an introduction to micro-controllers. The micro-controller is about 21$, a LCD about 13$, You would need a 9 volt battery, a battery connector, a battery to micro_controller connector, and a switch also. An assortment of colored wire would be helpful. Plus a plastic or metal box to pack it all into. If you are checking your cables near a computer you could uses the computer as a simple display device instead of the LCD. LCD : https://www.amazon.com/SunFounder-Serial-Module-Arduino-Mega2560/dp/B01GPUMP9C/ref=sr_1_1_sspa?adgrpid=1335907194272933 Micro-controller: https://www.amazon.com/ELEGOO-ATmega2560-ATMEGA16U2-Arduino-Compliant/dp/B01H4ZDYCE/ref=sr_1_2_sspa?crid=1L06F0IP302BX&keywords=Arduino+R3+Mega2560&qid=1684882151 wire: https://www.amazon.com/TUOFENG-Hookup-Wires-6-Different-Colored/dp/B07TX6BX47/ref=sr_1_3?keywords=colored+wire+spool&link_code=qs&qid=1684885902&sourceid=Mozilla-search&sr=8-3

You could use an Arduino Mega 2560 as it has enough digital input/output pins for your 28 connections. Other micro-controllers may work but I only know the Arduino controllers. Do you need more than a simple one line display? "Yup pin 13 is okay"

The D13005MD relates to the 3DD13005MD if that is any help. One would want to compare the two data sheets. It is not very likely one would have such a high power and high voltage transistor in ones stock. see: https://www.amazon.com/Generic-10PCS-D13005MD-3DD13005MD-TO220/dp/B0BRV663LX/ref=sr_1_37?keywords=d13005md&link_code=qs&qid=1684517602&sourceid=Mozilla-search&sr=8-37

Just for you, anyone else there would be a fee😏

No, just simply add a capacitor to the AOUT terminal ahead of the speaker from your board. Can you trace pin 5 of the LM386 directly to the AOUT terminal ? There may or may not be a small capacitor and resistor connected to pin 5 also. UPDATE: It look like the board already has an output capacitor. The yellow 227C is a 220 microfarad capacitor. So you do not need to add one. see: https://www.ebay.com/itm/391354402991?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338766894&toolid=20006& Just connect your speaker to the output terminals.

It looks like the unit you have is designed to work with a high impedance load like the input to the Arduino. Typically for a LM386 driving a 8 ohm speaker a 220 to 250 microfarad capacitor is used with the negative lead to the speaker. Try adding one to your unit. see the circuits here: https://www.ti.com/lit/ds/symlink/lm386.pdf?ts=1684218564218&ref_url=https%3A%2F%2Fwww.ti.com%2Fproduct%2FLM386

Perhaps you could get information from dioo via email. https://www.dioo.com/#/ProductsDetail?id=889

You could check the voltage output of the power supply before and after you have a problem with the unit. That would tell you if it is the power supply or not.

It is difficult to help you with no circuit diagram or photographys. Such problems are often thermal in nature. Something supplying current to the relay over heats and shut down perhaps. "Sometimes when turning on USB memory, or as the selected player plays. " Does that block it or unblock it?

What are the status attributes of a transformer other than temperature?

See: https://en.wikipedia.org/wiki/USB Be sure to look through the references at the end of the article.

Also see: What is a turntable ground cable