EEVblog #1289 - Mystery Huawei Teardown - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: March 05, 2020, 02:59:24 am
content: Mystery Mailbag Teardown!Huawei make WHAT?Subscribe on Library:https://lbry.tv/$/invite/@eevblog:7

author: Brumby
author_rank: Unknown
timestamp: March 05, 2020, 03:36:41 am
content: Those PSU caps .... Ranghai (never heard of them myself)

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: March 05, 2020, 05:22:58 am
content: Congratulation for getting over ten thousand subscribers on that website. I so happen to be one of them !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 equipmentAll 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

author: Brumby
author_rank: Unknown
timestamp: March 05, 2020, 06:31:33 am
content: My mistake.Still haven't heard of it before.

author: G7PSK
author_rank: Super Contributor
timestamp: March 05, 2020, 09:08:21 am
content: 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.

author: G7PSK
author_rank: Super Contributor
timestamp: March 05, 2020, 09:42:49 am
content: Quote from: blueskull on March 05, 2020, 09:20:03 amAbsolutely 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.

author: bsdphk
author_rank: Regular Contributor
timestamp: March 05, 2020, 11:54:01 am
content: The reason milling FR4 is not recommended is that it dulls the routing bits in no time.

author: G7PSK
author_rank: Super Contributor
timestamp: March 05, 2020, 11:58:31 am
content: Quote from: bsdphk on March 05, 2020, 11:54:01 amNot a problem with diamond cutters.

author: briangordon
author_rank: Newbie
timestamp: March 05, 2020, 12:34:01 pm
content: Quote from: johnlsenchak on March 05, 2020, 05:22:58 amYou 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.

author: Monkeh
author_rank: Super Contributor
timestamp: March 05, 2020, 03:00:39 pm
content: 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/5802588on the fan module, for example. Absolutely every day normal part on this sort of equipment.Quote from: briangordon on March 05, 2020, 12:34:01 pmYes, thank you so much for that.

author: Fryguy
author_rank: Regular Contributor
timestamp: March 05, 2020, 07:51:32 pm
content: 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 .

author: ckambiselis
author_rank: Regular Contributor
timestamp: March 06, 2020, 04:55:55 pm
content: 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

author: chris_leyson
author_rank: Super Contributor
timestamp: March 06, 2020, 06:16:41 pm
content: Thanks for the teardown Dave, nice to see a very well designed piece of equipment with no expense spared.

author: gamalot
author_rank: Super Contributor
timestamp: March 06, 2020, 07:13:48 pm
content: The Cortina chip:https://www.digikey.com/product-detail/en/inphi-corporation/WPIXF1104BE.B1-900204/1008-1045-ND/2505097

author: gamalot
author_rank: Super Contributor
timestamp: March 06, 2020, 07:28:04 pm
content: Quote from: blueskull on March 05, 2020, 05:32:57 amYou missed an American company.http://newsroom.kemet.com/news-releases/news-release-details/kemet-announces-chinese-manufacturing-joint-venture

author: thm_w
author_rank: Super Contributor
timestamp: March 09, 2020, 09:43:55 pm
content: Quote from: ckambiselis on March 06, 2020, 04:55:55 pmThink 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/