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Category Archive for 'Teardowns'

My small bench is located in one corner of the living room next to a sliding door so soldering fumes didn’t appear to be much of an issue when I had a fan blowing the solder away from me.

I thought it was probably time for a small upgrade so I bought one of the Solder Fume Extractor’s from Ebay, $24 locally, a bit pricey for what is it. Once I received it, it seemed to work fairly well, the distance you could be away from it and it still suck the fumes was around 15 to 20cm. If you didn’t want it that close, you could always use another fan to gently blow towards the fume extractor or use some materials to focus the suction of air.

After using it for 10 minutes, the fan started to smell and was getting a bit hot too. I left it running for an hour but still had the same issues, ugh, so it was time to take it apart and see what I can swap out.

 

The device has the AC power cord going directly into it, so I thought they might have a AC to DC converter with a DC fan. That wasn’t the case, upon unscrewing the 4 screws at the front, it’s an AC fan. Power is just running though the switch to the fan.

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Today we’ll be taking a look at the Netcomm NB6Plus4Wn ADSL2+ Wifi Router which is similar to the Netcomm NB6 Rev2 ADSL2+ we looked at previously except that this one has 802.11n Wifi and 4 LAN ports.

4 screw later and we’re in.

We’ve got a 3 chip solution, the main chip, LAN controller and Wifi controller which is using a discrete front ends for both antennas that look to have a balun in them. There’s a 5 pin header with only 4 pins soldered going to the main chip. Looks like there is also possibility for populating a USB header near the phone line port. PCB date code is 42nd week of 2011.

Something that stands out is the 2x Lelon 25V 2200uF caps which are swelling. We have a little bit of glue being used on the 2 inductors for the DC-DC’s as well as the one of the red caps to the line transformer.

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Today we’ll be taking a look at something a little bit modern, the Netgear Telstra Cable Adapter (CM450-1TLAUS) which is a cable modem with just the one Gigabit Ethernet port and RF connector.

4 screws later and we’re in.

We have a single chip solution with a large heatsink and the RF side has the usual RF shield. They have exposed ground strips on 3 out of the 4 sides of the board and there are no electrolytic caps to be found, they even had a footprint for one to the left but had the option of SMD caps too. Interestingly there are 2x 4 pin headers, labelly nicely, one reads UART0 (BBS) and the other UART1 (LINUX).

We have some logic chips around, an LV132 Quad NAND gate and on the bottom an 74HC74D Dual D-Type Flip-Flop and an LM358 too. PCB Datecode is 45th week of 2016.

For the power side, we have 4x DC-DC converters with inductors ranging from small to large, the largest one is the Richtek RT7233 18V 4A while the others are 6 pin chips (2x 04-P0G, 1x C8-L2P) which I can only assume might also be Richtek chips as the DC-DC’s don’t use an external diode.

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Today we’ll be taking a look at the Cisco DPQ3925-X Cable Modem / Gateway which is a cable modem with 4x Gigabit Ethernet ports, 802.11n Wifi, USB port and 2 analog phone ports.

4 screws later and we’re in.

Looks like we have a 2 chip solution, one of them has a pretty large heatsink. There is a Mini-PCI Express Wifi adapter with dual antennas. There is an RF can for the cable input and some conductive tape connecting it to the ethernet ports which is a little odd as the ethernet shielding is grounded. We also have tape near the main processor going to the memory and another small piece right next to the Mini PCI Express connector, strange. PCB date code is 37th week of 2014.

The main heatsink isn’t soldered down, instead the legs are bent so it can’t go anywhere.

Something else that stands out is that we have a 25MHz crystal which the case was soldered to ground.

The 2 Wifi antennas are located in the front of case.

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Today we’ll have a quick look at the Thomson DH1685P Digital Terrestrial Receiver which is a digital TV receiver that outputs to HDMI, composite, coaxial and has a USB input on the side.

A couple of clips later and we’re in.

We have a single chip solution with a small heatsink, the RF side with shielding, a whole bunch of Acon 220uF capacitors all over the board and there are two 6 pin DC-DC converters (H11R). They have left some of the copper exposed on the bottom and tinned it for slightly better heat dissipation. PCB date code is 48th week of 2011.

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Today we’ll be taking a look at the Netcomm NB1300 Rev2 ADSL Ethernet Modem which is an 10/100 Ethernet & USB ADSL modem, quite an old one back from 2003 and a bit dusty too.

 

Two screws later and we’re in.

Looks like the layout is pretty relaxed, lots of space left over. We’ve got a fair few electrolytic capacitors which are all branded Teapo, we have a single chip solution and interestingly there’s a VCXO. Date code is 35th week of 2003.

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A quick one today, we’ll be looking at the Huawei E220 HSDPA USB Modem which is a USB modem, kind of similar to the Telstra one shown a few weeks ago except it only supports 3G (and not NextG) networks with no external antenna support.

A few plastic clips and 1 screw later and we’re in.

This time we did have some RF shields around all of the important chips. We seem to have a large 22mF (22000uF) 4.5V supercapacitor, I think this one is the largest I’ve seen on any PCB, this board must have some serious current spikes. There’s a Samsung logo on the PCB so I’m guessing they designed this board. There are a few little RF chips about.

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Just a quick one today, we’ll be looking at the Card Star Thermodrucker thermal printer, a low cost parallel thermal printer, I wonder how old the design is as it has a parallel port. I picked it up on Ebay about 2 years ago now to use for address labels when mailing out items. There seems to be low cost USB thermal printers for not that much more.

With the printer I got a parallel to USB cable and an overseas AC adapter rated for 9V AC at 300mA, I’ve been wanting to change the adapter for something else, so we’ll have a quick look at doing that too.

A few clips later and we’re in. We can see the thermal print head and motor sit above the PCB, held in place by 2 screws/risers, the print head connects via a flat flex cable and the motor just through some wires. There are some decent sized capacitors, Richey 1000uF 25V and Richon 1000uF 6.3V and we have zener diodes on some of the parallel port data lines. The PCB date code is 03/97!

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Today we’ll be looking at the BenQ 21.5″ E2200HD LCD Monitor which features a 1080p display, HDMI / DVI / VGA inputs, speakers and a headphone jack. This one stopped working one day, I’ve had it for 8 years so decided to take it apart to see what was wrong.


(forgot to take some pictures of it before I took it apart, so here’s a stock image)

After a couple of tough clips and removal of the stand, we’re in. There was a metal cage holding the power and logic boards but it was just stuck on with some shielded tape, no screws whatsoever which was odd. Powering it up by the power button, I can see the power LED turn on for a fraction of a second, does this 2-3 times before it no longer lights the LED.

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Today we’ll be looking at the Netgear Wireless Cable Modem Gateway CG814WG v2 which is a cable modem/router with 4x 10/100 network ports, 1 USB port and 802.11b/g Wifi.

Four screws later and we’re in

We’ve got a 2 chip solution with only a heatsink needed for the Ethernet chip and the usual Mini PCI wifi card (which seems to be common for devices of this time). Only 1 DC-DC converter on board with a large 22uH inductor plus there are some noticeable 6.8uH inductors sprinkled around too, the caps are branded OST / TEAPO. We also have some 4×2 pin and 4 pin male header near the main chip. The PCB date code is 14th week, 2009.

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