It was such a pleasure to read this! Thanks for posting it. I've always wondered how boot ROM is loaded onto these chips in the first place. If one can overwrite the gauge chip with a custom boot ROM, wouldn't that allow loading arbitrary firmware? There wouldn't be a need to mess with the boot rom if this low-level programming access was available. Could just use it to manipulate the other parts directly :- But for all we know the boot rom could be stored in actual mask ROM on the chip, never to be changed.
|Published (Last):||21 July 2010|
|PDF File Size:||17.49 Mb|
|ePub File Size:||3.50 Mb|
|Price:||Free* [*Free Regsitration Required]|
There is a lot to be learnt from manufactured electronic products both old and new, from printers to TV's and a lot more. Each manufacturer has their own way of making something and we can learn from their reasoning and the short cuts they take. We can also reuse some of the parts for our own projects, extending the life of the item. As with any investigations we must be very careful especially when working with electronics such as TV's and monitors where high voltages are involved or the capacity for danger of shock even when the product isn't powered i.
If you are not sure what you are doing then don't risk hurting yourself. This page is presented as a means to learn and not to directly copy or rip anyone off. Be sure to check out my other pages about electronics which feature the use of parts from manufactured products such as on the main electronics page and the Interfacing page. To return to the main electronics page please click here. You can email me at james. Please be very careful if you attempt to disassemble any type of laptop battery.
Before I start I just want to remind you that you must be very careful when handling batteries, especially if you plan to take one apart. Before I even disassembled the battery pack I could see there were 4 large sections that I guessed each contained a battery which you'll see from the photo that follows is correct:.
As you can see, there are 2 batteries to the left, 2 batteries to the right, and a controller board in the middle to which a cable is attached of which the other end goes to the mother board. Each battery is rated at 3. By using a number of individual rechargeable batteries the cost is lowered as a larger, higher capacity battery in place of the 4 discrete ones would cost more. Each battery has a rectangular white component connected in series which is possibly some form of safety switch.
The controller board in the middle of the battery pack handles charging and communicates with the laptop. There are 8 wires that run to the controller board, 2 of which are red, 2 are black, and the rest are coloured white, blue, green and yellow. I found the yellow wire to be the battery enable wire which, when taken to GND, causes a voltage to appear across the red and black wires.
Note: if you are working out a laptop battery pinout and you are trying to find an enable line it's best to use a low value resistor I used R to test the pins which will limit the current should you accidentally connect an output to GND. Two of the other connections are likely for communication between the battery pack and the laptop, and the remaining wire should be connected to a temperature sensor commonly a thermistor but I was unable to confirm that.
If you look in the photo above you should see a grey rectangular object in the middle, to the right of the second battery from the left. I desoldered it and found it to be an NTC thermistor as its resistance dropped when heated and its resistance increased when left to return to room temperature. Each of the batteries in a pair are connected in series but with a middle connection such that I got readings of 3. In this way the controller board can monitor the batteries on an individual level.
After very carefully desoldering one of the battery pairs I then removed the common of the second pair and measured the current between the common and where it was connected to the control board and got a reading of 5mA. The connections between the batteries are welded together but if you were to remove them you could use the batteries separately but then you would need a charging board for each battery.
Fortunately, you can buy charging solutions for 3. Found in Apple MacBook Pro 15" laptops from the battery pack has the code A and is of type Li-ion Polymer with a rating of I found the battery pack very difficult to take apart and had to very cautiously break the plastic shell around the individual batteries and control board. Take a gander at the guts of the battery pack:. There are actually 6 cells, as there are 3 pairs, and 2 of the pairs have what appear to be a thermistor attached to sense temperature changes if a battery gets very hot it could be an indication of a fault and each pair also appears to have an inline surface mount component which most likely is a type of fuse.
The cell pairs are very well stuck together so I could not separate them without risk of damage and there are no indications of the individual battery rating. However, using my multimeter I read 3. You can view the cell arrangement I drew out here:. Two very thick wires, one red and one black, are connected from the battery to the control board at the very right in the photo at the start of this section , and they give a reading of Additionally, there are 2 thinner, green wires running from the battery pairs which is possibly for the control board to monitor a few of the batteries independently and for charging.
The battery pack connector is marked as 'FX 1BHDBD' and has 9 connections; on one side of the connector the positive and negative of the battery pack are labelled either end. Because the connector wires are so thin the positive and negative have three wires each so they can carry a much larger current between them. The only other connection I was able to identify was an enable signal which when taken low puts the full voltage across the positive and negative connections although oddly even with the enable line floating I was getting 0.
The remaining 2 connections are likely for communication between the battery pack and the laptop. One particular IC I was able to read the part number of on the control board is BQ20Z from Texas Instruments but finding information on it was difficult especially as a lot of people refer to the battery pack as BQ20Z A Genlock was generally used to overlay computer graphics onto a video source such as from a camera, and then the combined video stream could be recorded to tape.
The Genlock we will be looking at was designed for the Amiga , and PAL version , but in theory it could be used with any Amiga with the standard video connector. The following site has an image of what appears to be a newer version of the Genlock in question as my one doesn't have the control unit seen on the right in the top photo:.
The site does mention that the video connector on the ribbon cable is a 25 pin connector cut down to 23 pin which is also the case for the Genlock I have. The Appears Genlock runs off the power provided by Amiga's video port by making use of a voltage regulator in the unit. The Genlock supports different modes which replace an Amiga colour with the video input from the external source.
All that the software does that came with the Genlock is to let you switch between the different modes. It seems that you could, however, buy a control unit to do the same thing or make up your own control unit. I connected up the Genlock to my A and used an N64 as a test video input.
When I turned on the N64 I got the Amiga output overlayed on the N64 video with one colour acting as transparent. However, each time I turned on the N64 the Amiga graphics would appear at a different place on the screen vertically. I also found the Genlock software had stopped working not needed to actually have the Genlock mix the video signals but allows control of the different Genlock modes via the Amiga's parallel port. Now the Amiga's output was scrolling vertically as if it were a Genlock mode.
Looking inside the Genlock I could see that there were 4 control lines via the video out connector and 2 of them went to a data selector so that would give 4 modes from 2 lines. Through binary combinations I was able to get Amiga only, external video only and one colour transparent. One of the other inputs goes to a 4-bit magnitude comparator and if taken low while the other 2 inputs are low it makes one colour transparent instead of showing Amiga video only.
Foreground 2: restores opaqueness to colours used in foreground mode 1. The voltage regulator can be seen at top left and at bottom left there is a small daughter board with wires going off to various chips as well as the supports providing connections to the main circuit.
Inside there are a number of potentiometers with various markings such as P, B, R and V and you'll see that some of them have gone bad. I did try adjusting the potentiometers and one of them did alter the position of the Amiga video vertically but after switching off the N64 and back on the position would be wrong again. When I have more time I can diagnose the issue more which will involve replacing the potentiometers.
The amp supports component, composite and RGB video as well as audio analogue via L and R connectors or digital through coaxial connector. For a look inside the amp see the photo below:. Inside there is one main board and a smaller board for the power LED which was broken off from the main board. All-in-all, a relatively simple circuit laid out neatly with plenty of free space inside the unit.
You can read more about it in the operation manual:. And the service manual is also a very good read although lacking circuit diagrams even though 'service diagrams' are mentioned in the index:. Neither came with the battery which would be 12V rechargeable , power supply or anything else.
I swapped the LCD into the working unit and it displays fine so that suggests the main board is faulty; the LCD controller data sheets says it powers up in a random state until initialised so that further indicates a faulty main board. To open the unit there are 2 screws towards the top at the back that need removing and then the unit comes apart.
Some of the connectors are glued in, likely to reduce the chance of vibrations knocking them out. The cable that connects to LED board has a cable tie around in to keep it in. There is some heavy interference filtering on the input cables. There is a fuse, rated at 3. Now to look at the various boards and modules individually and some of the chips that have been used. There are also 3 LED's.
For communication with a processor the LCD module has a 10x2 connector, and a 2-pin connector for the backlight. While the system was on I measured 4. For my Arduino project that makes use of the LCD module please click here.
Large cable from switches board. Person alarm connector from front. At 0x3FE44 there is the company name and product name.
Those are just a few examples of the text that can be found in the flash ROM. The board attaches to the power board underneath via way connector and a 2-way connector. Varta mAh 3. Even in the working unit the battery has leaked somewhat. Maxim maxacwe Adjustable, step-down, current-mode PWM regulator:.
The board connects to the battery contacts, DC in socket, printer, RS connector, alarm connector, and pump motor. You may just be able to make out in the image above where the battery has leaked on the connector pins on the far right and the LT regulator just below the battery and slightly to the right.
Enclosed in felt, likely to reduce vibration and sound when operated. Contains a motor, pneutronics valve 12VDC x2, and a pressure sensor. The motor has what looks to be dual capacitors 2.
Maxim maxacwe. Adjustable step-down current-mode PWM regulators:. The printer connects to this board via 2 connectors, one for the motor and the other for the print head. Here is a photo of the pump with the felt removed left , and the printer right in which I have lifted up the actual printer mechanism:.
The C is a Dosimetry electrometer that was made by Nuclear enterprises Reading, UK and to quote the manual the device is "intended for making measurements of Dose and Doserate from ionising radiation using a remote, cable connected, air filled ionisation chamber.
BQ8030DBT, BQC-36, BQEB930
There is a lot to be learnt from manufactured electronic products both old and new, from printers to TV's and a lot more. Each manufacturer has their own way of making something and we can learn from their reasoning and the short cuts they take. We can also reuse some of the parts for our own projects, extending the life of the item. As with any investigations we must be very careful especially when working with electronics such as TV's and monitors where high voltages are involved or the capacity for danger of shock even when the product isn't powered i. If you are not sure what you are doing then don't risk hurting yourself.
Inside Manufactured Products
Warm Tips: Please fill out the below form and we will contact you as soon as possible. The BQDBT components of Jotrin Electronics are carefully chosen, undergo stringent quality control and are successfully meet at all required standards. The production status marked on Jotrin. If you did not find what you were looking for, you can get more value information by email, such as the BQDBT Inventory quantity, preferential price, and manufacturer. We are always happy to hear from you so feel free to contact us. We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet. After all the goods are ensure no problems afterpacking, we will packing safely and send by global express.
Battery EEPROM Works
Log In New customer? Start here. Order History. Manufacturer: Texas Instruments. CAD Models. Alternate Names. Texas Instruments has several brands around the world that may alttemate names for BQDBT due to regional differences or acquisition.