Okay, I have this cool Advent 200Mbps Powerline Ethernet adapter. This basically lets you use the power lines in the house to send data from computer to computer. These were given to me new in the box as the person had wifi installed and no need for them any more. Well the wifi in my room is poor so I decided to put them to use.
One thing always bugged me about it was that it always ran INSANELY hot during operation. Around 70°C on the case, I measured it with an IR thermometer. I would have thought that Advent would have designed the device to therefore cope with this... apparently not.
After about 2-3 months of use, the adapter does not work any more. If left plugged in the green power LED flashes occasionally, but it doesn't do anything useful. It no longer registers as an ethernet device according to the computer.
So, I open it up and lo and behold - as expected, the fault is a cap which has gone pop. A cheap "JACKCON" cap, almost like planned failure. They knew it would fail with such a cap in just a short amount of time. Well, unlike the majority of users, I am technically competent to repair this.
But, the main question is why on earth it was running so hot anyway? Why would it? The design is interesting. Two boards stacked upon each other.
The bottom board has an BGA packaged ARM processor (for a reason I cannot think of - why on earth are they using a processor in the first place? There are plenty of PoE chips which do the whole show without that being required), a REALTEK ethernet chipset (probably for PoE), two memory devices (one on the top and one on the bottom), some misc. power circuitry and the switching mains power supply. The top board has the status LEDs, and some misc circuitry. I suspect the top board has some of the receiving circuitry moved on to it to reduce the size of the entire device. I cannot imagine this drawing any more than 100mA continuously and the power supply is more than big enough to dissipate that amount of heat. The power supply controller - TNY276PN - is rated up to 5W - and is marketed as energy efficient. The heat is definitely coming from the supply and is very likely to have caused the cap to pop. I suspect it has +5V and -5V rails as the other cap is intact. To give it a chance, I'll replace both with a 1000u 10V Panasonic capacitor, a pack of four costs me only £1.50 - and that's on eBay, where prices are massive.
I hate cheap electronics, but the thing is - these adapters weren't cheap! They were originally about £120 (for two.) I can't imagine a slightly more expensive quality rated cap would have failed in any where near the time and cost much extra. But they know that - they want you to throw them in the trash and buy a new one. Maybe you'll blame the failure on a "power surge" or something like that, then buy them again. Or whatever you do, even if you just throw them out, you have contributed to environmental waste.
I have another one of these adapters, for the downstairs (you require two for a link.) Any bets on when that one will go?
One thing always bugged me about it was that it always ran INSANELY hot during operation. Around 70°C on the case, I measured it with an IR thermometer. I would have thought that Advent would have designed the device to therefore cope with this... apparently not.
After about 2-3 months of use, the adapter does not work any more. If left plugged in the green power LED flashes occasionally, but it doesn't do anything useful. It no longer registers as an ethernet device according to the computer.
So, I open it up and lo and behold - as expected, the fault is a cap which has gone pop. A cheap "JACKCON" cap, almost like planned failure. They knew it would fail with such a cap in just a short amount of time. Well, unlike the majority of users, I am technically competent to repair this.
But, the main question is why on earth it was running so hot anyway? Why would it? The design is interesting. Two boards stacked upon each other.
The bottom board has an BGA packaged ARM processor (for a reason I cannot think of - why on earth are they using a processor in the first place? There are plenty of PoE chips which do the whole show without that being required), a REALTEK ethernet chipset (probably for PoE), two memory devices (one on the top and one on the bottom), some misc. power circuitry and the switching mains power supply. The top board has the status LEDs, and some misc circuitry. I suspect the top board has some of the receiving circuitry moved on to it to reduce the size of the entire device. I cannot imagine this drawing any more than 100mA continuously and the power supply is more than big enough to dissipate that amount of heat. The power supply controller - TNY276PN - is rated up to 5W - and is marketed as energy efficient. The heat is definitely coming from the supply and is very likely to have caused the cap to pop. I suspect it has +5V and -5V rails as the other cap is intact. To give it a chance, I'll replace both with a 1000u 10V Panasonic capacitor, a pack of four costs me only £1.50 - and that's on eBay, where prices are massive.
I hate cheap electronics, but the thing is - these adapters weren't cheap! They were originally about £120 (for two.) I can't imagine a slightly more expensive quality rated cap would have failed in any where near the time and cost much extra. But they know that - they want you to throw them in the trash and buy a new one. Maybe you'll blame the failure on a "power surge" or something like that, then buy them again. Or whatever you do, even if you just throw them out, you have contributed to environmental waste.
I have another one of these adapters, for the downstairs (you require two for a link.) Any bets on when that one will go?
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