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
18 views

Pin config for CIS scanner

I've salvaged a linear scanner from an HP scanner cum printer. The scanner senor model is CA4B94. It's got two portions on a single flat ribbon cable. One is for the motor, so I guess it's safe to ...
0
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0answers
38 views

Figuring out Inductance

I am trying to figure out the Inductance used on this PCB. I know it's value but need to understand what type of inductor it is and other things so I can order it. The code on it ...
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0answers
73 views

How can i identify these chips

I have a board that has 4 chips that have their markings being removed. I'm not able to identify them. I'm looking for a way to identify them. I have actually two different boards made in different ...
23
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6answers
7k views

Is it truly impossible to tell what a CPU is doing? [closed]

Computer programmers often recite the mantra that x86 instructions are totally opaque: Intel tells us they are doing something, but there is no hope that anyone can verify what's happening, so if the ...
0
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1answer
74 views

Detect an unknown communication protocol and read data on it

We have old type textile machinery in our factory. (open end machine) on the machine's screen is showing the operating efficiency of the machine. Under the hood, When I follow the cables, the sensors ...
0
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0answers
17 views

Naming confusion, how to connect DAC (BB/TI PCM1603KY) I2S, which pins do I need to use?

I am totally new in the field of DAC's and I2S. I salvaged this board from a DVD player and is well documented. There are three data lines DATA1..DATA3 that will be used for ...
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0answers
66 views

Help identify RJ11 pins on a relay board - No152133

I'm tinkering with my garage door motor (Marantec Comfort 220) which have a RJ11 6-pin connector (X10) for an accessory relay board. The board consists of three (3) relays driven via the RJ11 ...
3
votes
1answer
164 views

Reverse-engineering RS-485 communication

I've been trying to reverse engineer the communications protocol used by my home domotics, which I was able to determine uses a RS-485 implementation. I'm using a USB RS-485 serial dongle and an ...
1
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3answers
98 views

solder-bridge at ribbon-connector?

I am currently trying to repair a pen-tablet-monitor, which has what i call a 'blind/dead row'. Meaning that i can draw everywhere, but there is this one row, where any input is either picked up by a ...
0
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0answers
45 views

Strange CLK-similar signal

I'm reverse-engineering the data bus inside a projection clock to find out how to drive the projection without the clock. I use PulseView with a logic analyzer. What I (think to) know so far: It ...
1
vote
1answer
30 views

Power button behaving as OFF-(ON) momentary switch rather than latching- Troubleshooting

I have a device which doesn't turn on normally when you press the power button like it did before. You have to keep holding it down for it to remain on. As soon as you let go, it turns back off. In ...
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0answers
20 views

Wiring video inputs for the Microvision Showwx+ projector

I have been given a Microvision Showwx+ projector which I would like to hook up to a video source. Mine only came with the Dock connector, so it will not work with any modern video outputs. I know ...
0
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1answer
44 views

Reverse Engineer DIN 5-pin connector

Summary I have a digitial guitar amplifier that can be controlled via a footswitch. The footswitch is connected to the amplifier via a DIN 5-pin cable. I want to be able to control the amplifier with ...
0
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0answers
33 views

Speaker crossover: can wrong ESR cause amplifier to clip?

I have an old pair of speaker I decided to revive. I recapped the crossover with new caps but now my amp keeps clipping when I turn the volume a little bit high (and it was not before). I wonder if ...
0
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2answers
108 views

Reverse engineering SREC firmware

I have a firmware from a long discontinued product that I would like to improve on. The firmware is in a .mot file format (SREC from my research) and is uploaded using a tool called M16C asynchronous ...
2
votes
1answer
140 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
234 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
61 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
52 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
votes
2answers
34 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
51 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
159 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
84 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 ...
-4
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1answer
55 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
727 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
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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. ...
0
votes
1answer
82 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
245 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 ...
1
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2answers
108 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
votes
0answers
109 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
72 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
109 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 ...
5
votes
2answers
260 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
votes
1answer
100 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
717 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 ...
2
votes
1answer
114 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
86 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
125 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
80 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
225 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 ...
-1
votes
1answer
291 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
222 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
957 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
196 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
votes
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 ...
2
votes
0answers
396 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
votes
1answer
177 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
votes
3answers
195 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
78 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
vote
1answer
135 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 ...