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Questions tagged [reverse-engineering]

The process of taking a completed system and determining details of its design; may have legal limitations or ramifications in different jurisdictions

1
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0answers
100 views

Please help me understand this bjt set up works

This is part of an automotive timer (NOT a 555!) that we have at work. Because I'm extremely bored I'm challenging myself to understand how this one operates. I've spent about 1.5 weeks with tutorials,...
2
votes
1answer
208 views

Help me hack my Yamaha Receiver

I’ve been given a faulty Yamaha RX-V765 Receiver. Parts are no longer available for this unit, and I’m trying to convert (i.e. hack) it directly into a Power Amp. I have been able to get some audio ...
1
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0answers
53 views

How should I go about reverse-engineering this printhead?

I'm interested in using the Epson FA04010 printhead in a project. I'm pretty sure it uses piezo-based inkjet tech, and I can see in the product images it has 21 pins. I can't find any specs at all for ...
0
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2answers
48 views

Bosch Glue Pen: Bypassing automatic timeout [closed]

I have this Bosch hot glue pen. It has an annoying habit of turning itself off. I guess it's probably intended to be a safety feature or a battery saver, but really it's just a nuisance. Can I modify ...
2
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2answers
23 views

Primary current expectation in unloaded toroidal transformer

Background I found a hefty, 7 kg toroidal transformer in visually good condition at a flea market which I am trying to map out. This is part one: I am not sure about what is happening on the primary ...
0
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0answers
47 views

Where to get datasheets for this part: ZJL JL2233 1650M18 ?

I am currently reverse engineering an LED Driver (STARES LED DRIVER; Model No.: WLJ-60-50) for my LED Lamp where the lamp doesn't turn on anymore. The trouble I have with this PCB is that i can't ...
4
votes
1answer
151 views

Identify this open collector serial protcol

I'm trying to analyze the serial link between two devices, respectively a motor controller board and a Li-Po battery manager, which battery powers both devices. The application is a battery-powered ...
2
votes
1answer
77 views

What's the purpose of this circuit section?

I'm experimenting on VCA circuits and found the same (or similar) pattern in many linear VCA projects found in internet using LM13700 OTA. The specific section I'm curious is made by an Op-amp, a ...
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1answer
51 views

Does tools for automation analysis image IC for extract netlist exist? [closed]

Does tools for automation analysis image decapsulated IC for extract netlist exist ?
6
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1answer
714 views

How does this circuit work? 48VDC relay and 1.4VDC battery from 230VAC

In order to repair a programmable timer plug, I'm doing some "reverse engineering" on it, it's not for the cost (about $5) but more for learning and recycle thought. I draw the scheme but can't ...
7
votes
3answers
3k views

What is this small unconnected solder blob on this PCB?

There's a small solder blob in the middle of this one-sided PCB (a switch-mode power supply), surrounded by unmasked board. The blob is 1.5mm in diameter, and the non-masked area is 4mm in diameter. ...
0
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1answer
80 views

What program would be appropriate for designing a reimplementation of the TurboGrafX16 at gate level?

To be clear, I'm looking for a program I could use to redesign the TurboGrafX hardware at gate level, but to gate to gate, just for functionality. Also, given that I'm interested in GPU design, what ...
2
votes
3answers
170 views

How to interface with micro LCD projector?

I disassembled a cheap "wall projection" clock: And removed the LCD board that displays the projected clock readout in front of the super bright red LED: As a small hobby project, I'd like to wire ...
0
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2answers
97 views

What software use to hack wireless protocol ( logic analyze ) USBee

Q: What software do you use for logic analyze? Why: I try to hack(reverse engineering) my home wireless heating system control to make my own central control unit. Wireless: My heating system uses ...
2
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0answers
106 views

Trying to figure out what kind of input signal this loudspeaker amp circuit needs

I'm still trying to figure out how this door intercom module works. It's a 18y old siedle TLM 611-0 module, I figured out the mic part, there the audio signal is modulated onto the current the mic amp ...
1
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0answers
57 views

LED-Monitor-Firmware reverse engineering / disassembly => replace manufacturer startup logo

I have a display from a disassembled led-monitor (Wortmann Terra 2446W), that I want to use for a SmartMirror-project. Unfortunately, the monitor shows a big manufacturer logo when connected to power, ...
0
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1answer
92 views

Can you determine needed input voltage from just looking at this circuitboard?

Question poster's level of knowledge: BEGINNER/NOVICE/MENTALLY CHALLENGED Device: A stage lighting pan/tilt motor, for one axis. Used in sets of two to provide remotely controlled X and Y movement ...
4
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2answers
253 views

What kind of serial communication is this?

I am trying to reverse engineer a serial communication between to microcontrollers (1 device & 1 microcontroller on a board). One MCU validates the other MCU and I want to crack the validation and ...
0
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1answer
96 views

reverse engineering the Nord Lead 4 control board

I am reverse engineering a synthesizer named nord lead 4. I want to tap in between the control board and mainboard which has the microprocessor. i didn’t started with the powered on analysis but i am ...
6
votes
3answers
696 views

Determining UART RX pin “blind”?

My mom had an old Roku that she no longer wanted so I took it figuring I might be able to hack it and run a generic Linux on it. I took it apart and saw two headers that looked like they might be for ...
0
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0answers
39 views

Connecting an (Polycom) RJ 9 to Plantronics headphone

Hello I am trying to rewire an RJ-9 phone cable and connect it to headphone jack. I have uploaded the following images to show exactly what i want to do: https://imgur.com/uOt4esa -->I want to know ...
2
votes
1answer
106 views

How to remove Black cooling paste on IC?

I am trying to reverse engineer a product, but I ran into a problem: One IC had a heatspreader on top of it. With a bit of force I could remove it, but I am unable to read what's written on the IC, ...
0
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1answer
82 views

PCB power planes and routing question

Ok this is my first time trying some kind of reverse engineering and I have few experiences in PCB testing so it may be a basic question. Basically I am trying to get the schematics for an 8 channel ...
0
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2answers
111 views

Help with reverse engineering an LED driving circuit

I am trying to reverse engineer an LED driving circuit. The schematic I generated from analyzing the board looks as follows: The main circuit is this one: https://www.monolithicpower.com/pub/media/...
0
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0answers
58 views

Identify TI motor driver IC (from old HP printer) or its control protocol

For fun, and as an exercise in reverse engineering junk hardware, I am trying to understand the internals of an HP DeskJet 840c printer from 2001. Specifically I am trying to understand how the motor ...
3
votes
3answers
189 views

Help Understanding a PCB Circuit from Cordless Hot Glue Gun

I'm trying to understand the circuit in this PCB taken from a cordless hot glue gun. Battery voltage is 18-19v. I've been able to identify most of the components but not all. And most importantly I ...
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1answer
251 views

Voltage convert from 110v to 220v

Should the ceramic heater in soldering iron be changed to convert the iron from 110 volt to 220 volt? What about the Thyristor? I know getting new iron is better, but my question is just for learning....
4
votes
1answer
182 views

Why 2 zero-crossing detection circuits in heater?

I reverse engineered the power board of an electric heater. I think, I understand most aspects of this circuit. One thing is not entirely clear to me though: The circuit seems to have two distinct ...
1
vote
1answer
584 views

Flashing nordic n51802

I have a Chinese rip-off game pad, which has an n51802 which is by nordic. I want to flash my own firmware but i’m unable to find any information about it. I can put it in DFU mode, so it is flashable,...
0
votes
1answer
175 views

Serial Wire Debug (SWD) Enumeration

When debugging or accessing hardware firmware, JTAG and SWD can be really helpful to the developer, engineer or reverse engineer. When looking at an unknown board/device tools such as JTAGEnum or ...
5
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4answers
2k views

Do PCBs have schematics? [closed]

I have been studying electronics a bit at home in my spair time. I was wondering if manufacturers make schematics for PCBs? If I could get ahold of something like that i feel that I could understand ...
2
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0answers
248 views

Dumping contents of read-protected PIC

I have a need to read out the flash memory of a read-protected PIC16F57 (this is for legal purposes). From my basic research, there appears to be no way of doing this short of decapping it and reading ...
3
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1answer
156 views

Reverse engineer a custom (failed) transformer

I am attempting to repair an aged air conditioner I have tracked the issue to a failed secondary on a current transformer. Very helpfully schematics are available for the circuit board and inform me ...
0
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3answers
168 views

Air Purifier Circuit Mod Help [closed]

I have an air purifier I would like to modify the PCB to an always on state at high setting when plugged in. This would allow me to control the device with and Amazon Echo compatible smart plug. ...
-1
votes
1answer
74 views

Reverse engineering to MSP432P401R LaunchPad Development Kit [closed]

I have this LaunchPad Development Kit(MSP432P401R): I connected the kit to the computer using USB (Like in the image), and through the PuTTY software I was able to receive the output and input to the ...
1
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1answer
104 views

How to interpret this CAN bus data and find an equation?

I am trying to reverse engineer the data sent from an old CAN bus data logger. It sends a single ID which is selectable from a dip switch. The only bit of data I am struggling with is the RPM I plan ...
0
votes
1answer
142 views

How to connect LCD backlight wires [closed]

I have bad caps in my LCD monitor. While taking it apart, I disconnected the LCD backlight wires to get to the power supply. I blame bad product design and my own stupidity for not checking how the ...
1
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0answers
38 views

Trying to identify part driving in magnetic levitator. Maybe a 2.5 V switching regulator?

Its from a toy magnetic levitator purchased on alibaba. I wanted to understand and modify it but the key component has the markings sanded off. I'm pretty sure I got the pins figured out and know how ...
6
votes
1answer
146 views

Identifying component from i2c trace & obscure SMD marking

I wanted to poke around one of those sub-10$ smart bands, so I got a couple of them. I opened it and I was able to identify some major components from the SMD markings, including a Dialog DA14580 MCU, ...
0
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2answers
232 views

Help identifying a SOP-18 IC (labels removed) by reverse engineered circuit

I have a SOP-18 IC (0.65mm pin pitch) which I need to identify. It seems the vendor removed the labels on top of the IC, so I need your help. The IC is usually connected to a bunch of LEDs and two ...
0
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0answers
73 views

Help with assessing maximum operating voltage of a circuit

I am designing a field charger for charging lipo batteries while I am out flying and on the go and I already have a huge 16000mah 4S lipo available that I could use to charge my 1300mah 4S and 2200mah ...
0
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4answers
2k views

Reversing the Direction of An Induction Motor?

I have this motor I salvaged from a dryer, and I'm interested in reversing the direction of spin because it spins in the direction opposite of typical machine threads. The Capacitor is shown at the ...
0
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1answer
131 views

Figuring out the protocol of an SPI device without a datasheet

I am pondering about interfacing with the iPad Mini 2 touch panel. It seems that no one has successfully done this and/or published anything about it, so I want to take a stab at it. As far as I ...
4
votes
1answer
352 views

Difficulties reverse engineering a digital bathroom scale

I apologize if this has been discussed elsewhere and for the length of the post. This is a group project and we plan to take the weight value from the scale and send it via a WiFi connection to ...
1
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4answers
185 views

Does modern market has IC chips which can be fully reverse-engineered with optical microscope?

I'm planning a new course on digital electronics and semiconductors devices for my university. I think, it would be great to go to the lowest available level of abstraction, or, at least, slightly ...
4
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3answers
627 views

How to reverse engineer controller outputs of a sprinkler control box?

I want to replace the controller of a sprinkler control box with my own design, while keeping the backplane and module(s). The controller has a 14 pin ribbon cable connection to the backplane and 4 ...
2
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0answers
281 views

Reverse Engineering Panasonic AC Remote Control Circuit

I have a Panasonic air conditioner which comes with a wired remote controller CZ - RD513C attched to the wall and has no infrared. I want to make a circuit connecting to STM32F746 to automate the ...
1
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2answers
201 views

Decoding a Two-Wire SPI-esque Serial Protocol

I'm working on a project that involves the optical sensor from a mouse. I've got the original control PCB (still populated, save for the optical sensor itself), and I've got the optical sensor on my ...
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0answers
76 views

Reading multiplexed or charlieplexed display, is it possible and how?

What I try to do is reading a 7 pin display with 35/36 segments/LEDS. I want to do this to know what the device is doing. Why? Because I want to know I can do it (it is possible anyway) and to be able ...
2
votes
1answer
206 views

Identify a 320V DC Brushless IC Power MOSFET(?) Driver

I need some help identifying this IC. It comes from a bladeless fan. It is presumably a 230V Power MOSFET(?) element connected to the FCM8201 Three-Phase Sine-Wave BLDC Motor Controller. The thick ...