EEVblog Electronics Community Forum
EEVblog => EEVblog Specific => Topic started by: EEVblog on March 05, 2020, 02:59:24 am
-
Mystery Mailbag Teardown!
Huawei make WHAT?
Subscribe on Library: https://lbry.tv/ (https://lbry.tv/)$/invite/@eevblog:7
https://www.youtube.com/watch?v=z3V-1v-UhTc (https://www.youtube.com/watch?v=z3V-1v-UhTc)
-
Those PSU caps .... Ranghai (never heard of them myself)
(https://www.eevblog.com/forum/blog/eevblog-1289-mystery-huawei-teardown/?action=dlattach;attach=943910;image)
-
Congratulation for getting over ten thousand subscribers on that website. I so happen to be one of them ! 8)
Huawei has been banned in the United States something to do with their equipment being a network monitor for the Chinese government. So here in the good old USA ( Not Aussie ) we don't see any of their products, no cell phones or networking equipment
All those PC boards in that unit are "Sex on a Stick"
A good video idea is trying to de-solder those high priced power supplies off the main board
-
My mistake.
Still haven't heard of it before.
-
I have found the best way of removing units like those power boards providing you dont want the main board they are on is to use a miniature diamond core drill. These are meant for drilling tiles and glass and are available in sizes down to four millimeter. I cut out the via on each leg then you can either easily de solder or if they are tight on the pins sand the remains down to the pins.
-
I have found the best way of removing units like those power boards providing you dont want the main board they are on is to use a miniature diamond core drill. These are meant for drilling tiles and glass and are available in sizes down to four millimeter. I cut out the via on each leg then you can either easily de solder or if they are tight on the pins sand the remains down to the pins.
The last thing I want is to drill or grind FR4, especially considering how hard face masks are to come by. I'd rather pan fry the board with vegetable oil than to drill and cut the board.
Absolutely no problem with dust, just like drilling glass or tiles you use a bit of paraffin or dish washing liquid,keeps the dust down and lubricates the cutter making it last longer.
-
The reason milling FR4 is not recommended is that it dulls the routing bits in no time.
-
The reason milling FR4 is not recommended is that it dulls the routing bits in no time.
Not a problem with diamond cutters.
-
Huawei has been banned in the United States something to do with their equipment being a network monitor for the Chinese government. So here in the good old USA ( Not Aussie ) we don't see any of their products, no cell phones or networking equipment
You can get a Huawei phone if you want one, but telecoms can't use their equipment and Google can't license the Play Store or Maps, Gmail, etc to them so it will have weird Chinese knockoff versions of the apps.
-
The connectors aren't custom - they're standard backplane connectors. https://www.digikey.com/product-detail/en/amphenol-icc-fci/51722-10201200ABLF/609-5060-ND/5802588 (https://www.digikey.com/product-detail/en/amphenol-icc-fci/51722-10201200ABLF/609-5060-ND/5802588) on the fan module, for example. Absolutely every day normal part on this sort of equipment.
Huawei has been banned in the United States something to do with their equipment being a network monitor for the Chinese government. So here in the good old USA ( Not Aussie ) we don't see any of their products, no cell phones or networking equipment
You can get a Huawei phone if you want one, but telecoms can't use their equipment and Google can't license the Play Store or Maps, Gmail, etc to them so it will have weird Chinese knockoff versions of the apps.
Yes, thank you so much for that.
-
Hi Dave , i noticed on the board with the 9 big chips that only 8 of them are sitting right next to a pair of memory chips ! The one in the middle has no memory and a different set of peripheral parts underneath it - so this must be something else . There you have your 8 channels and one other chip probably doing some interfacing . :-/O
-
About the press fit power connectors, I work in custom made vehicle manufacturing, the bus size type, and the main power distribution boards we currently use, have the same type, first time I saw them I thought the maker was cutting on cost by not soldering them, since the boards are all connectors and huge traces to distribute the signals, but I guess they are normal, haven't heard from the older folks that they have had any vehicle come for repairs because of them, even though all the cabling connections we make must be shakeproof.
Oscar
-
Thanks for the teardown Dave, nice to see a very well designed piece of equipment with no expense spared.
-
The Cortina chip:
https://www.digikey.com/product-detail/en/inphi-corporation/WPIXF1104BE.B1-900204/1008-1045-ND/2505097 (https://www.digikey.com/product-detail/en/inphi-corporation/WPIXF1104BE.B1-900204/1008-1045-ND/2505097)
-
Those PSU caps .... Ranghai (never heard of them myself)
Jianghai, they used to be a Chinese military factory making capacitors, then went private during China's company reform (state owned companies became private or public).
They had joint venture with Hitachi and Elna, and they used their technology to build equivalent models to Rubycon, Nichicon and Chemicon (they all have cross reference to each other).
You missed an American company. :)
http://newsroom.kemet.com/news-releases/news-release-details/kemet-announces-chinese-manufacturing-joint-venture (http://newsroom.kemet.com/news-releases/news-release-details/kemet-announces-chinese-manufacturing-joint-venture)
-
About the press fit power connectors, I work in custom made vehicle manufacturing, the bus size type, and the main power distribution boards we currently use, have the same type, first time I saw them I thought the maker was cutting on cost by not soldering them, since the boards are all connectors and huge traces to distribute the signals, but I guess they are normal, haven't heard from the older folks that they have had any vehicle come for repairs because of them, even though all the cabling connections we make must be shakeproof.
Oscar
Think about all the garbage lead-free solder joints we've seen that have cracked, due to thermal cycling or vibration. A properly made press-fit connection is probably far more reliable.
https://www.connectorsupplier.com/press-fit-connectors-in-harsh-automotive-applications/ (https://www.connectorsupplier.com/press-fit-connectors-in-harsh-automotive-applications/)