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

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Samsung Powerbot vr9000 reverse engineer PCB connections

I've been reading along for quite some time and now I would like to ask a question of my own. Samsung has a vacuum robot series, with a variety of models that mostly only differ in the software. PCB'...
2
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1answer
836 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 ...
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166 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 ...
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1answer
190 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 ...
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2answers
137 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 ...
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2answers
406 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 ...
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2answers
241 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 ...
2
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1answer
142 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
61 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 ?
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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. ...
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1answer
84 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 ...
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3answers
821 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 ...
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2answers
210 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 ...
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4answers
32k views

Determining I2C Address without Datasheet

When setting up I2C communications, I know that it is certainly ideal to have the devices' datasheet(s), and find the I2C address of the device(s) that way. However, in some reverse-engineering ...
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158 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, ...
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1answer
413 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 ...
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2answers
322 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 ...
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1answer
113 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 ...
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4answers
2k views

How hard is it to reverse-engineer a two-way protocol for a beginner with a logic analyzer?

I recently bought a Tacx Flow trainer, which has a handlebar computer, with a 6channel RJ-11 cable between the trainer and the handlebar computer. The computer reads pedal frequency, power and speed, ...
6
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3answers
832 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 ...
3
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1answer
748 views

Reverse-engineering asynchronous serial protocol for EcoSmart Tankless Water Heater

I am trying to reverse-engineer the remote control protocol for my EcoSmart Tankless Water Heater. Unfortunately, the remote control device is no longer available for purchase, and the manufacturer ...
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1answer
164 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, ...
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1answer
89 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 ...
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2answers
182 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/...
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177 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 ...
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4answers
4k 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 ...
4
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1answer
435 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 ...
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1answer
2k 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,...
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3answers
1k views

Understanding IR Protocol Checksum generation

To control my AC with an Arduino, I'm trying to emulate the IR Remote. Not with another IR LED, but directly connected to the IR Receivers Signal wire on the board. Using the Arduino as a Logic ...
2
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1answer
157 views

Getting more information about a transformer

I'm trying to figure out more information about a small transformer on a old board that we are reverse engineering, can someone give me some advices about how can we reverse engineer this transformer? ...
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4answers
3k 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 ...
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0answers
1k 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 ...
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1answer
275 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 ...
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3answers
279 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. ...
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1answer
100 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 ...
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1answer
565 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 ...
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3answers
2k views

Is it possible to “crack” an ASIC?

Could someone break an ASIC? If an ASIC is a fully customized, app-specific CPU, is possible to reverse engineer it? I'd imagine the answer in general is no, since to me the only way to do this ...
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0answers
43 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
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1answer
234 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, ...
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1answer
555 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 ...
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0answers
157 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 ...
21
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4answers
11k views

Is it possible to reverse engineer a chip design?

Can we make something like chip reader, which can understand chip design and generate blueprint of it?
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1answer
227 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
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3answers
1k 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 ...
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4answers
273 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 ...
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2answers
252 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 ...
2
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1answer
305 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 ...
11
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4answers
9k views

Remove an LED from a circuit

I have bought a webcam from which I would like to remove an LED (burning it is also fine for me). By doing so, I could obviously change the way the circuit works, so my questions are: Should I ...
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0answers
135 views

Reverse Engineering a transmitter circuit

This circuit is from a radio transmitter electric gate keyfob. -> http://www.easygates.co.uk/product_info.asp?ProductID=340 I want to make my own keyfob. How would I go about finding or creating a ...
22
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4answers
7k views

Why does a mouse need a crystal?

I was looking at this schematic for an old (pre USB) mouse: when I noticed it had a crystal on it (Y1). I was curious why a mouse would need a timer? Wouldn't it be able to use the clock from the ...