SOLD (UK) Raspberry Pi 2 model B 1GB - Page 1
Forum section: electronics / general

author: TopLoser
author_rank: Unknown
timestamp: August 15, 2015, 10:57:58 am
content: Big big box of customer returns, all of them the new Pi 2 model B 1GB. All in original packaging and a big list of the various faults reported. Faults include:SD card won't stay in slot (A LOT of these repoerted)SD card won't fit in slot (A LOT of these reported)Won't bootNo videoUSB socket faultyThere does seem to be a QC issue with the SD card socket, seems to be mechanical and a little arm needs bending slightly.Let's start at £100 for a random batch of 25, plus shipping. 25 weigh just less than 2Kg so I can use Royal Mail, £5 shipping UK, £15 elsewhere sensible.ALL SOLD

author: TheAmmoniacal
author_rank: Unknown
timestamp: August 15, 2015, 12:04:04 pm
content: Are they all individually packaged in the original box?

author: TopLoser
author_rank: Unknown
timestamp: August 15, 2015, 12:42:08 pm
content: Yes, original packaging as stated.I've had a few messages asking if I can sell smaller quantities. I offered them in larger quantities so people would stand a good chance of getting a decent amount of working ones. I also thought people could sell any excess working ones and make a bit of profit to pay for their own. With a quantity of 5 it's a bit more of a gamble. But if anybody wants to take the gamble then of course I'll sell smaller (or larger) quantities. I have over 250 left at the moment.25 for £100 + £5 / £15 shipping10 for £45 + £4 / £10 shipping5 for £25 +£3 / £7.50 shipping

author: TheAmmoniacal
author_rank: Unknown
timestamp: August 15, 2015, 12:45:27 pm
content: I didn't even catch that.. The inattentiveness is strong today.PM sent.

author: TopLoser
author_rank: Unknown
timestamp: August 15, 2015, 09:37:29 pm
content: These are selling nice and smoothly, means I must have set the price about right for onceAbout 100 left now, get em while you can

author: TopLoser
author_rank: Unknown
timestamp: August 15, 2015, 09:48:31 pm
content: Quote from: Deathwish on August 15, 2015, 09:42:01 pmOnly the ones my ex-wife inserted sideways while she bent me over double.

author: TheAmmoniacal
author_rank: Unknown
timestamp: August 15, 2015, 09:51:40 pm
content: You keep making me jealous!

author: TopLoser
author_rank: Unknown
timestamp: August 15, 2015, 09:57:09 pm
content: Quote from: TheAmmoniacal on August 15, 2015, 09:51:40 pmIf I told you what lead up to the divorce then you would feel REALLY jealous haha

author: TheAmmoniacal
author_rank: Unknown
timestamp: August 15, 2015, 10:00:55 pm
content: Quote from: TopLoser on August 15, 2015, 09:57:09 pmDid you return the favour?

author: TopLoser
author_rank: Unknown
timestamp: August 15, 2015, 10:06:37 pm
content: Quote from: TheAmmoniacal on August 15, 2015, 10:00:55 pmI just paid up the £360,000 and moved alongThe more crap you buy from me the more fun I can have now

author: TheAmmoniacal
author_rank: Unknown
timestamp: August 15, 2015, 10:13:19 pm
content: I knew I should have married you earlier! The politicians were too slow on same-sex marriage!(Just kidding, I wouldn't have left!)

author: TopLoser
author_rank: Unknown
timestamp: August 15, 2015, 10:25:39 pm
content: Quote from: Deathwish on August 15, 2015, 10:15:51 pmFully aware of that, and aware that it works both ways. Hence losing thousands selling expensive stuff cheap here

author: TopLoser
author_rank: Unknown
timestamp: August 15, 2015, 10:55:43 pm
content: Lots of these sold now so I won't be reducing the price, that would be unfair to all those people that have bought some already. If you were waiting for a price drop it's not going to happen so just buy them while there are some left

author: aargee
author_rank: Frequent Contributor
timestamp: August 15, 2015, 11:39:50 pm
content: PM sent.

author: microbug
author_rank: Frequent Contributor
timestamp: August 16, 2015, 09:05:20 am
content: PM sent

author: TopLoser
author_rank: Unknown
timestamp: August 16, 2015, 07:07:51 pm
content: Down to the last 10 of these things...

author: TopLoser
author_rank: Unknown
timestamp: August 16, 2015, 11:10:06 pm
content: No more messages please, these are all sold now.

author: Macbeth
author_rank: Super Contributor
timestamp: August 18, 2015, 12:34:49 pm
content: Got my 10 today. Cheers Ian!Just a quick test using my existing OSMC setup on my telly - so testing Ethernet, USB, HDMI, etc.4 all working no problem1 won't latch sd card but otherwise OK1 Ethernet not working, otherwise OK3 power on and activity leds lit, but stuck on and no boot1 working but flashes little square in corner of display indicating power problem. This soon changed to red and I burnt my finger on the CPUouch!I suspect the last one has been overclocked and overvolted to within an inch of its life - I can scavenge it for theUSBLAN and SD connectors if needed.

author: TopLoser
author_rank: Unknown
timestamp: August 18, 2015, 01:22:13 pm
content: Now go buy a few new ones from Maplin and then shortly after return some faulty ones

author: Macbeth
author_rank: Super Contributor
timestamp: August 18, 2015, 01:43:11 pm
content: Quote from: TopLoser on August 18, 2015, 01:22:13 pmBut then they will only end up back on your desk as customer returns in a couple of months... You'll end up re-selling them back to us lot. aah - I've now worked out your business model. Crafty

author: TopLoser
author_rank: Unknown
timestamp: August 18, 2015, 01:44:40 pm
content: Exponential growth! In 23 days I'll be a billionaire!!

author: Macbeth
author_rank: Super Contributor
timestamp: August 18, 2015, 01:55:17 pm
content: To much effort offloading them on Maplin. Farnell will deliver and pickup for me. I might try that route.(oh, I'll be fair - CPC could do with a couple too)

author: TopLoser
author_rank: Unknown
timestamp: August 18, 2015, 02:00:32 pm
content: From what I hear Frys in the US will be getting a load returned as well!

author: TopLoser
author_rank: Unknown
timestamp: August 18, 2015, 02:12:41 pm
content: Found another 15 of these, plus a handful of 8G NOOBs microSD cards.ALL GONE, till the next lot...

author: bingo600
author_rank: Super Contributor
timestamp: August 18, 2015, 02:27:37 pm
content: PM sentEdit:FSCK !!!!! - Beaten by 30 sec/Bingo

author: Zucca
author_rank: Unknown
timestamp: August 18, 2015, 02:53:00 pm
content: Quote from: bingo600 on August 18, 2015, 02:27:37 pmhttps://en.wikipedia.org/wiki/Fsck

author: TopLoser
author_rank: Unknown
timestamp: August 18, 2015, 03:13:04 pm
content: Quote from: Macbeth on August 18, 2015, 01:55:17 pmI might as well just give Farnell a list of names and address of people they should send new ones out to FOC, saves the scabby ones making a two way trip...

author: Eartoot
author_rank: Contributor
timestamp: August 18, 2015, 05:35:33 pm
content: My batch of 10 arrived today. Thanks.

author: Macbeth
author_rank: Super Contributor
timestamp: August 18, 2015, 08:29:47 pm
content: Quote from: TopLoser on August 18, 2015, 03:13:04 pmSurely they keep track of serial numbers so that kind of scam wouldn't work anyway?Actually I did have a go at fault finding on the non boot up ones today. It wasn't helped by the confusing naming convention for the Pi's. There I am looking at a schematic for aRaspberry Pi Model B Revision 2.Why does nothing make any fucking sense?Ahh... Thats for the Raspberry Fecking Pie Version 1 Model B Revision 2.0, not the Fecking Raspberry Tart Version 2 Model B Revision 1.1It's obvious now! ... and of course the document date shoulda been a clue.Anyway, checking the more obvious smoothing caps in the PSU area I found the 5V, 3.3V, 1.8V, and 1.22 Vcore supplies. The Vcore was down to 0.25V on two boards and 0V on the other. Easy fix? unless the CPU does its own Vcore regulation... Save that for another day - or the junk box.

author: TopLoser
author_rank: Unknown
timestamp: August 18, 2015, 08:43:17 pm
content: Interesting all 3 showed a similar fault.Before you send them back put a little red dot on them somewhere so I can recognise them next time round the loop

author: ThisNameIsBlank
author_rank: Contributor
timestamp: August 18, 2015, 09:15:41 pm
content: Mine arrived this afternoon.Thanks very much Ian.

author: Eartoot
author_rank: Contributor
timestamp: August 18, 2015, 09:28:13 pm
content: Had a chance to have a quick look at the batch of 10 I got. 4 had various general failures written on box.One doesn't boot. Solid yellow/red lights and no video. Possibly issue reading from microSD.Two boot but the microSD card doesn't latch.Rest boot into Rasbian, keyboard/mouse work in bottom USB ports and ethernet port works.One of the working models had some heatsinks badly applied to both sides of the board.Now to get some cheap cases and will be ready to give them to some kids who I think will appreciate them.Thanks again.

author: Isad
author_rank: Frequent Contributor
timestamp: August 18, 2015, 09:32:19 pm
content: Quote from: Macbeth on August 18, 2015, 08:29:47 pmNo rpi does the vcore outside of the cpu it would cause to much heatfor the tiny procesor to do regulation inside there is a small chip on the board that i bealive takescare of 1.8 and 1.22V but dont take this for granted.

author: TopLoser
author_rank: Unknown
timestamp: August 18, 2015, 09:34:32 pm
content: If anybody gets a REALLY bad lot then of course I'll refund your money including shipping. I accept you all took a gamble but I do stand behind the crap I sell.

author: Isad
author_rank: Frequent Contributor
timestamp: August 18, 2015, 09:38:25 pm
content: Quote from: TopLoser on August 18, 2015, 09:34:32 pmAnd this is why we love you.LoL

author: TopLoser
author_rank: Unknown
timestamp: August 18, 2015, 10:09:26 pm
content: Quote from: Deathwish on August 18, 2015, 10:02:55 pmMore than I want and more than I need. Unless we're talking about space.

author: TopLoser
author_rank: Unknown
timestamp: August 18, 2015, 10:41:24 pm
content: Storage? Got a 4m long x 2.5m high 3 shelf chunk of Dexion pallet racking going to the skip soon. Weighs a metric shit load so collection only.60Kg of assorted semiconductors and another 60kg of assorted passive stuff needs to go as well, but they don't take up too much space so no rush with those.Fume extraction equipment next on the list of big crap to get shut of.

author: nctnico
author_rank: Super Contributor
timestamp: August 18, 2015, 11:15:38 pm
content: Quote from: Deathwish on August 18, 2015, 10:51:33 pmRent a car! When someone got a bunch of really good doors I rented a van to pick them up.

author: TopLoser
author_rank: Unknown
timestamp: August 18, 2015, 11:40:06 pm
content: Quote from: nctnico on August 18, 2015, 11:15:38 pmToo right!!Without wishing to sound too harsh here.. (cue harsh rant lol)..I make a bloody good profit buying and selling crap. It's not about luck, it's about being in the right place at the right time. And being in the right place at the right time means getting off your arse and being there!No complaints about 'would have could have should have', just fucking do it. I despair sometimes, we only go this way once so take full advantage of anything that comes into view. Life and all it's opportunities don't come to us, we have to chase them.Time to sell some crap to somebody in Saudia Arabia now, need to drive 3 or 4 hours tomorrow to get export documents and invoices signed and stamped by the not so local Chamber of Commerce before the opportunity vanishes...

author: Macbeth
author_rank: Super Contributor
timestamp: August 18, 2015, 11:40:57 pm
content: Quote from: Deathwish on August 18, 2015, 11:26:14 pmTwo of my mates are disabled and have driving licences - plus highly subsidised adapted cars on the Motability scheme. One has cerebral palsy and drives a Focus 1.6 auto, the other has no working legs and drives an Octavia vRS auto with hand controls. Insurance, road tax, mersey tunnel fees, free parking, new car every 3 years, all taken care of.

author: TopLoser
author_rank: Unknown
timestamp: August 18, 2015, 11:42:43 pm
content: We must meet up sometime Macbeth and have a fucking good rant together lol

author: Macbeth
author_rank: Super Contributor
timestamp: August 19, 2015, 12:12:00 am
content: Quote from: TopLoser on August 18, 2015, 11:42:43 pmGood idea. Make sure you have something heavy and exotic for me to take back from Skeggy in the car. Unfortunately I'm driving banned 'til darkest winter, is Butlins open then?Deathwish, if you are in North Wales I could maybe pick you up for a little holiday

author: idpromnut
author_rank: Unknown
timestamp: August 20, 2015, 06:39:20 pm
content: Go me Raspberry Pis! Thanks Ian! (4 days to Canada….)

author: Dave
author_rank: Super Contributor
timestamp: August 21, 2015, 02:21:31 pm
content: Received my batch of 5 today.2 are working flawlessly, 2 have some trouble booting, 1 has a power fault. I'm going to try fixing these over the weekend, fingers crossed.Very happy with the deal, considering it would cost me significantly more to buy 2 new ones from a distributor.Thanks, Ian!

author: wraper
author_rank: Unknown
timestamp: August 22, 2015, 02:20:18 am
content: Out of 25:1 model B+ inside RPi2 box, bastards, at least it's working OK;6 are working;1 is working but micro usb is soldered a bit rotated, not sraight; EDIT: while comparing board with malfunctioning usb with this one, turned out there is only 0.7k vs 38k across R50 on this board. Turned out U50 is faulty, after desoldering resistance between ilim pin and GND of AP2553W6-7 dropped to even lower 14 ohms. The strange thing is this IC kinda worked and connected/disconnected power from USB. So by accident found a fault on kinda working board. UPD: IC replaced, micro USB connector resoldered - repaired.8 with broken micro SD slot; microSD sockets ordered. Molex 503398-1892. UPD one board repaired with salvaged connector from the board with dead BCM2836.1 damaged HDMI connector (1747981-1 TE Connectivity), otherwise working; EDIT: connector replaced - repaired1 USB connectors have not +5V on them, otherwise working; EDIT, faulty C97 ceramic capacitor, measured about 0.6k and caused protection in U13 to kick in. This cap basically clamps any voltage above 1.5V. Capacitor is 47 or 33 uf (measured in between those values, most likely 47uF with crappy Z5U or similar ceramic) UPD: cap replaced - repaired.1 seem to boot up but no image; UPD: Dud, blown TDMS transmitter 1+ in BCM2836. Otherwise it outputs TMDS signals, thorough with weak level. Could be repaired if it was possible to source this SOC other than soldered on RPi2 board.2 completely dead, both leds on;EDIT: cracked U16 on both, check your boards for it(that bare die NCP6343BFCCT1G IC which caused xenon death flash).1 Ethernet not working, shows connected/disconnected every few seconds; UPD: Likely was some issue with transformer or whatever else inside the ethernet connector. Transformers measured OK on PHY side. Replaced connector - repaired.1 No boot, heats up at power converters part; EDIT: U16 seem to be faulty. Pushes 2+V into 1.2V rail. EDIT 2, removed U16 and connected 1.2V externally. Its alive! BCM2836 survived despite the torture. I've even seen how it is blinking in thermal camera while 1A 5V charger shut down and restart because of the overload. UPD: IC replaced with salvaged one - repaired1 start to boot, passes out in the middle, bot leds became permanently lit. Heats up at power converters part; EDIT:cracked U16. UPD: repaired with salvaged NCP6343BFCCT1G from the board with dead BCM2836.1 No power, no red led, completely dead; EDIT, BCM2836 heats up (likely dead), sags 3.3V rail. Seems to be a dud. UPD: Have gone for spare parts. Could be repaired if it was possible to source this SOC.

author: idpromnut
author_rank: Unknown
timestamp: August 22, 2015, 03:31:29 am
content: Out of 6:1 working flawlessly;2 booting and working, but higher current consumption + red LED goes off (indicating 5V rail slump to under 4.6V);1 with blown open switching supply inductor;1 with a non-locking SD socket;1 which does not boot, red light doesn't stay on, power rails all slumped.Still worth it for the 1 that works and the two that will easy enough to fix!

author: PA0PBZ
author_rank: Super Contributor
timestamp: August 22, 2015, 01:13:44 pm
content: My 'score':10 basically work, not tested Ethernet and USB yet5 doing nothing, no lights, drawing < 10mA3 doing nothing except overheating the Broadcomm3 alright except the non-latching SD card slot3 booting but drawing excess power and getting hot (0.5 - 2A)1 booting in 640x480bonus: 2 cases, 1 SD card and a slightly burned thumb

author: wraper
author_rank: Unknown
timestamp: August 22, 2015, 01:52:15 pm
content: BTW if you have a few boards with cracked tiny U16 and not being able to replace it, I'll take them for what you bought them + shipping (if it is low enough to justify the deal).

author: PA0PBZ
author_rank: Super Contributor
timestamp: August 22, 2015, 02:16:11 pm
content: Quote from: wraper on August 22, 2015, 01:52:15 pmU16 is the flash sensor isn't it?I just found out that there are no schematics published.Makes it a bit harder to find out what's wrong, but I'll keep your offer in mind.

author: wraper
author_rank: Unknown
timestamp: August 22, 2015, 02:18:32 pm
content: Quote from: PA0PBZ on August 22, 2015, 02:16:11 pmU16 is DC/DC converter for 1.2V Vcore

author: PA0PBZ
author_rank: Super Contributor
timestamp: August 22, 2015, 02:19:51 pm
content: Quote from: wraper on August 22, 2015, 02:18:32 pm

author: Macbeth
author_rank: Super Contributor
timestamp: August 22, 2015, 07:25:16 pm
content: I highly suspected U16 and the circuitry around it could be the culprit on a few of these dead boards. Why? because its a freaking tiny bastard 15 pin BGA flip chip die on board thing that looks impossible to replace - Murphys law, etc. Its an ON Semi NCP6343, has anyone found a datasheet with pinouts? It can handle 3A so I would say a lot of those pins are paralleled. But any of the surrounding parts look doable. Just having some kinds of schematic (reverse engineered) would help.Oh, I don't care about the Xenon flash thing. It's an interesting effect for sure.

author: TheAmmoniacal
author_rank: Unknown
timestamp: August 22, 2015, 07:31:36 pm
content: Keep publishing the failure modes and fixes here please, will be getting mine soon!

author: PA0PBZ
author_rank: Super Contributor
timestamp: August 22, 2015, 07:57:47 pm
content: Quote from: Macbeth on August 22, 2015, 07:25:16 pmI don't care either, but I just posted the video because I think wraper didn't get the joke..

author: wraper
author_rank: Unknown
timestamp: August 22, 2015, 08:08:57 pm
content: Quote from: Macbeth on August 22, 2015, 07:25:16 pmI'll take those boards if they seem impossible to replaceIMO they were broken because some idiots poked them or tossed the board in the pile of other stuff. Only one out of four was dead without mechanical damage.As of broken micro SD slots. They are damaged by idiots, not manufacturing defect. I inspected under the microscope and the plastic part in the latch is damaged in all of them. Idiots pulled out memory card with all strength instead of pushing it inside so it would get released released.

author: TheAmmoniacal
author_rank: Unknown
timestamp: August 22, 2015, 08:14:40 pm
content: Quote from: wraper on August 22, 2015, 08:08:57 pmAre you able to identify the microSD socket used? Can you confirm that it is the:http://www.molex.com/molex/products/datasheet.jsp?part=active/5033981892_MEMORY_CARD_SOCKET.xml

author: wraper
author_rank: Unknown
timestamp: August 22, 2015, 08:20:27 pm
content: Quote from: TheAmmoniacal on August 22, 2015, 08:14:40 pmYes seems this. I couldnt find any other molex micro SD socket of this shape. Found them at farnellhttp://lv.farnell.com/molex/503398-1892/connector-micro-sd-push-push-1/dp/2358234Though ordered them from aliexpress insteadhttp://www.aliexpress.com/item/5033981892-503398-1892-push-push-type-bomb-MOLEX-original-TF-memory-card/32399539280.html

author: wraper
author_rank: Unknown
timestamp: August 22, 2015, 08:24:16 pm
content: Quote from: Macbeth on August 22, 2015, 07:25:16 pm

author: TheAmmoniacal
author_rank: Unknown
timestamp: August 22, 2015, 08:32:38 pm
content: Quote from: wraper on August 22, 2015, 08:20:27 pmYeah, went straight on Aliexpress when I first bought the Raspberries and ordered a row, chose the seller who had "authentic" in the title though - gives me less of a guilt trip if I am to resell it.http://www.aliexpress.com/item/503398-1892-5033981892-TF-card-play-new-genuine-authentic-spot/32359790426.html

author: Macbeth
author_rank: Super Contributor
timestamp: August 22, 2015, 08:43:43 pm
content: Quote from: wraper on August 22, 2015, 08:08:57 pmYeah I got 3 out of 10 with no 1.22v supplies. Another 1 that rapidly overheats (1.22v is all over the place)I figured the SD slot had been stripped by owner on another 1 of them. Pressing on the metal case while inserting the card allowed it to latch but I have not found a happy medium that does not hold it in on its own for sure. A simple fix would be to remove the spring I imagine - then you just slide the card in and pull it out the same as in a Samsung Galaxy phone. I wouldn't sell it like that just use it myself.

author: TheAmmoniacal
author_rank: Unknown
timestamp: August 22, 2015, 08:47:06 pm
content: For TopLoser, find some more rework stations in your storage-of-returned-items, seems like I might need something with hot air!

author: Macbeth
author_rank: Super Contributor
timestamp: August 22, 2015, 08:57:34 pm
content: Quote from: wraper on August 22, 2015, 08:24:16 pmBrilliant! I really should get a Manta - TopLoser just sold one and it went in 10 microseconds!Just for kicks I attempted to reflow one by dabbing some flux around it and blasting with the hot air gun while looking for 1.22 at the C163/L3 junction. It rose from 0.25V to 0.8 or so then dropped to bugger all and the red LED went out. After power cycling it came back with same old 0.25v fault

author: wraper
author_rank: Unknown
timestamp: August 22, 2015, 09:02:56 pm
content: Quote from: Macbeth on August 22, 2015, 08:57:34 pmReflowing flip chips is useless.

author: wraper
author_rank: Unknown
timestamp: August 22, 2015, 09:07:34 pm
content: Quote from: Macbeth on August 22, 2015, 08:43:43 pmI seriously would take them for what you paid, so you could at least recover the loss. I don't think you can do anything worthy with them if not used to replace bare die IC's

author: Macbeth
author_rank: Super Contributor
timestamp: August 22, 2015, 09:14:44 pm
content: Quote from: wraper on August 22, 2015, 09:02:56 pmYes, that makes sense now you say. Worse than useless even.

author: wraper
author_rank: Unknown
timestamp: August 22, 2015, 09:37:17 pm
content: Only one out of 25 left (that with no image but booting) not repaired or not waiting parts (+one dud which gone to parts with BCM2836 being almost short on 3,3V rail). Replaced ethernet connector on that board with ethernet not working, likely was some issue with transformer or whatever else inside. At least transformers measured OK on the PHY side. So seems that yield will be at least 23 out of 25.

author: TopLoser
author_rank: Unknown
timestamp: August 22, 2015, 10:10:20 pm
content: I'll try and find another batch for you Wraper, impressive work

author: wraper
author_rank: Unknown
timestamp: August 22, 2015, 11:24:56 pm
content: Seems that something wrong with TMDS transmitters on the last board. Especially with TMDS transmitter 1. This board actually outputs video, but signal level is weak and TMDS data 1+ is pulled down to 1.5V DC (should stay at 3.3V) Actually I can get image on the monitor if connect over DVI, but image is green. Also, when not powered TMDS data 1+ pins measures about 35 ohm to GND while other transmitters 1.2 meg. On the working PCB all transmitters measure 42 meg to GND. Likely BCM2836 is dud. UPD, 100% dud, likely someone hot plugged HDMI and blew it. So will remove NCP6343 and micro SD socket from this board and fix another two boards and wait until ordered parts arrive to fix remaining boards.

author: ThisNameIsBlank
author_rank: Contributor
timestamp: August 23, 2015, 10:43:25 pm
content: Quote from: wraper on August 22, 2015, 08:20:27 pmThank You! Just ordered some.Splendid work getting 24/25 working.

author: wraper
author_rank: Unknown
timestamp: August 23, 2015, 11:36:51 pm
content: Quote from: ThisNameIsBlank on August 23, 2015, 10:43:25 pmActually 23/25 (will be when the parts arrive) as on one board BCM2836 was short over 3.3V rail, on other one TMDS transmitter (HDMI) in BCM2836 is blown. Still remaining 7 boards waiting for micro SD sockets and 2 boards waiting for NCP6343. Would fix those two boards too if it was possible to buy BCM2836 (no avail even on taobao).

author: TheAmmoniacal
author_rank: Unknown
timestamp: August 24, 2015, 02:02:53 pm
content: Received today, just tested.Out of 10, five are working just fine; boots into Raspbian and does 8*8 on the calculator with mouse and keyboard. Ethernet not tested on any.2 has a high current draw in excess of 1 A.1 has a broken/loose retention clip on the microSD connector.1 just doesn't boot and has a low current draw ~60 mA, dim red PWR light.1 just doesn't boot but has an elevated current draw of ~400 mA.Now it's on to fixing!

author: wraper
author_rank: Unknown
timestamp: August 24, 2015, 03:57:52 pm
content: I would strongly suggest to test all possible things in the "working" ones. Today after some additional testing, turned out that on one "working board" two GPIO pins are not working properly (test with enabling pull ups/pull downs and reading the inputs). As they are connected directly to the Broadcom SoC, likely it's damaged and this board can also be considered as dud. Unfortunately I don't have LCD and camera to test those interfaces too.

author: dr_dan
author_rank: Contributor
timestamp: August 24, 2015, 07:40:32 pm
content: I've finally had enough spare time to do some very superficial testing: Booting to Noobs menu, checking USB keyboard and mouse are recognised and HDMI output is providing video. There's still plenty of scope for other things to be broken, but...4 boards seem to be working fine1 board has the SDCard broken latch issue1 board appeared to have an accident before reflow - camera connector attached by a couple of random pins, diagonally across the pads!4 boards don't boot - no video output, no time to investigate further yet.I'll count that as 6 out of 10 so farAs an extra bonus, one board had a pair of SanDisk low profile USB drives still attached - 64Gb each

author: TopLoser
author_rank: Unknown
timestamp: August 24, 2015, 08:59:10 pm
content: Quote from: dr_dan on August 24, 2015, 07:40:32 pmWTF?? Seriously?? !Well if anybody thinks I went through them picking out decent ones for myself then think again..!!Bugger!!

author: PA0PBZ
author_rank: Super Contributor
timestamp: August 24, 2015, 09:41:44 pm
content: Quote from: TopLoser on August 24, 2015, 08:59:10 pmI'm disappointed Ian, you could have done much better!

author: TopLoser
author_rank: Unknown
timestamp: August 24, 2015, 09:56:03 pm
content: Quote from: PA0PBZ on August 24, 2015, 09:41:44 pmYou sound like my Mother!

author: wraper
author_rank: Unknown
timestamp: August 25, 2015, 02:24:20 am
content: Script for testing GPIO.I just made a quick and dirty modification of wiringPi script for previous models but seem to work as it should.http://wiringpi.com/the-gpio-utility/pin-test/Don't forget to add permission to execute if it doesn't run.

author: AudioplatinumService
author_rank: Contributor
timestamp: August 25, 2015, 06:38:24 am
content: Hi,Thanks for the pintest script, it's very useful for testing!Cheers,Damir

author: ThisNameIsBlank
author_rank: Contributor
timestamp: August 25, 2015, 07:25:13 am
content: Just for the stats, from quick testing hdmi sound+video/usb/network I've got2x no hdmi - but seem to work otherwise can log on over network3x power problems - very dim flickering red light.1x unknown issue - leds behave normally but no hdmi or network7x broken sdcard holder -> holders ordered thanks to link in this thread.1x minor hdmi issue (on auto it starts up in a very low resolution but edit config and it plays happily at normal resolutions)Rest of the box (15) seem OK. Interestingly all the ones with labels on 'Does not boot' were perfectly okI've not checked current draw yet - this was just a quick 'how bad are they?'

author: wraper
author_rank: Unknown
timestamp: August 25, 2015, 09:02:11 am
content: Quote from: ThisNameIsBlank on August 25, 2015, 07:25:13 amIf HDMI connector + soldering and 4x dual inductors nearby are OK, then damaged BCM2836. Useful to just measure resistance from TMDS lines to GND, blown transmitter likely will measure low. Could be Hotplug/DDC issue too.QuoteLikely something wrong with two DDC lines. As there are parts in between of the connector and BCM2836, quiet likely repairable.

author: neslekkim
author_rank: Super Contributor
timestamp: August 25, 2015, 10:30:16 am
content: Regarding hotplug, does it mean that it's not safe to plug/unplug hdmi while the pi is turned on?

author: wraper
author_rank: Unknown
timestamp: August 25, 2015, 11:09:31 am
content: Quote from: neslekkim on August 25, 2015, 10:30:16 amIt means that it's not safe to any hot plugging of any connector in PC/monitor/whatever if both devices are mains powered as SMPS usually have Y1/Y2 capacitors between primary side and GND. The worst case is when connecting something double insulated with something earthed. Usually some discharge happen when plugging, normally Ground connects first and nothing happens. But if you have some crap Chinese HDMI cable, for example, which doesn't have shield connected to the body of connector (actually quiet a lot in the wild), you'll get this discharge into some of the pins. I'm too lazy to disconnect devices from mains usually, but acknowledge the risk when I'm hot plugging.

author: neslekkim
author_rank: Super Contributor
timestamp: August 25, 2015, 12:06:25 pm
content: Quote from: wraper on August 25, 2015, 11:09:31 amI always hotplug my computers, have done that since forever.. I could understand that the Pi didn't like it, but at the same time, not.. since it's made for kids etc. Static discharge I know of, trying not to walk around on carpets when I'm handling electronicsBut was curious to if it is more to it on these devices..Thanks for the explanation.

author: wraper
author_rank: Unknown
timestamp: August 25, 2015, 01:25:10 pm
content: Quote from: wraper on August 24, 2015, 03:57:52 pmUPD. Those two GPIO pins had 2.8V on them, were shorted together too (2.5 ohms). If shorted to GND, supplied more than 1 A of current. Removed the BCM2836 and measured the chip directly, yep, it is faulty. So now it seems 22/25. So only 5 out of 25 boards initially were without any defects as tested for now. Though, I would prefer all of them being obviously faulty, rather than with suspected hidden defect.BTW, if you use Raspbian from the Raspberry pi websitehttps://www.raspberrypi.org/downloads/or contained in NOOBS without updating it, CPU will be stuck at 600 MHz, and not rise to 900 MHz no matter what.If updated, CPU will run at full speed.https://github.com/raspberrypi/linux/issues/964Quote

author: Zucca
author_rank: Unknown
timestamp: August 25, 2015, 02:29:39 pm
content: Quote from: wraper on August 25, 2015, 01:25:10 pmI am always happy to see a professional well done job. Thankswraperfor all yours feedbacks.Tempted to send you my 10 Rasps and pay you the service.

author: wraper
author_rank: Unknown
timestamp: August 25, 2015, 05:29:50 pm
content: Quote from: zucca on August 25, 2015, 02:29:39 pmMy service is not cheap

author: Macbeth
author_rank: Super Contributor
timestamp: August 25, 2015, 08:21:12 pm
content: Great stuff wraper. I don't care too much if some of my Pi's are slightly damaged. e.g. the faulty Ethernet port - No problem I can use it with USB WiFi. A media centre Pi needs HDMI and no GPIO while something I would use as a controller in something would be the other way around.The totally dead ones or overheating are annoying though. Those NCP6343's are cheap from Mouser but I'm going to need to wait until I've got a big enough order as £12 delivery ruins it. Besides I need to practice BGA stuff with a skillet and hot air.You should show us how you do it(Please...)

author: aargee
author_rank: Frequent Contributor
timestamp: August 25, 2015, 09:02:55 pm
content: Patiently waiting (or not) for my 10 to arrive. A loooong way to Aus...All the fault finding will be done by then

author: wraper
author_rank: Unknown
timestamp: August 25, 2015, 11:53:51 pm
content: Quote from: Macbeth on August 25, 2015, 08:21:12 pmPeanuts...

author: Macbeth
author_rank: Super Contributor
timestamp: August 26, 2015, 12:15:51 am
content: Fantastic. Are those gloves asbestos? I need a pair of those

author: wraper
author_rank: Unknown
timestamp: August 26, 2015, 12:20:10 am
content: Quote from: Macbeth on August 26, 2015, 12:15:51 amBut they require asbestos hands too.http://www.tme.eu/en/details/glove-esd-rs3_m/esd-clothing/.

author: aargee
author_rank: Frequent Contributor
timestamp: September 02, 2015, 07:55:44 am
content: My order of ten arrived today...6 With no problems2 With slightly dodgy SD holders (look at them the wrong way and they pop)2 With no SD retention at all.1 is a bit slow but after several reboots seems normal now(?).I know that doesn't add up to ten (thanks Ian!)All were tested with keyboard, mouse, wifi dongle, audio, HDMI.All were stress tested by playing EEVBlog videos for at least half an hour or so.All draw around the 400mA mark when playing Youtube.Ethernet ports not tested. One had an 8GB Kingston card installed that was non functional.

author: microbug
author_rank: Frequent Contributor
timestamp: September 02, 2015, 07:25:18 pm
content: I have 15 working off the bat, out of 25. Haven't yet attempted repair of the 10 remaining, but judging by what people are saying here at least some should be possible. There are 3 where the SD card won't stay in — has anyone found a solution for this other than replacing the socket?

author: wraper
author_rank: Unknown
timestamp: September 02, 2015, 09:48:25 pm
content: Seeing how many of them people reporting being working, either I got really bad batch (5 out of25fully working EDIT: actually 5 out of 24 + one working B+ model in Pi 2 box) or you don't test them well enough (probably both cases). Though this wasn't an issue for me.For me, test for the working boards was following:1. test 4x usb2. test USB overload protection with electronic load, should kick in at about 600 mA (1x faulty found)3. test youtube, (ethernet, sound) (1x faulty ethernet)4. GPIO test script (1x with faulty GPIO)5. Some GPU/CPU stress tests6. current consumption during work, after shutdown (61-68 mA depending on the board).

author: wraper
author_rank: Unknown
timestamp: September 02, 2015, 09:54:21 pm
content: Quote from: microbug on September 02, 2015, 07:25:18 pmOther than holding the microSD card in place with something like a piece of sticky tape or rubber band there is no real solution except replacing the socket. Socket itself is mechanically damaged, plastic part broken because of idiot users.

author: microbug
author_rank: Frequent Contributor
timestamp: September 03, 2015, 09:05:24 pm
content: 15 was a typo, it should have been 14. Anyway, I tested all the USB ports and the ethernet, so I'll check the GPIO, overload protection and current consumption (and do some stress tests) on the working ones. Shame about the SD card slots, but I suppose they still work with the aid of blu-tac / tape.

author: wraper
author_rank: Unknown
timestamp: September 03, 2015, 09:23:15 pm
content: microSD slots can be replaced without a hot air with just a soldering iron. All soldering points are exposed on the sides. Though might me a little bit tricky.

author: aargee
author_rank: Frequent Contributor
timestamp: September 30, 2015, 09:00:00 am
content: Just an update...Just got around to replacing the first Micro-SD card holder with success. (Using the link that Wraper posted ...http://www.aliexpress.com/item/5033981892-503398-1892-push-push-type-bomb-MOLEX-original-TF-memory-card/32399539280.html, thanks!!)I used a small tube adaptor on my hot air station to remove the old one and a fine tip iron and flux to attach the new one.It does seem to be the plastic part inside to socket that breaks on the faulty ones. I'll have a go at the others in the next week or so.- Rob.

author: edavid
author_rank: Super Contributor
timestamp: October 14, 2015, 02:20:00 am
content: Here's my score:A. 11 boot OK, no problems foundB. 5 boot OK, bad SD card latchC. 1 boots OK, but Ethernet doesn't workD. 5 won't boot, red and green LEDs on, normal standby currentE. 1 won't boot, draws 0.5AF. 2 won't boot, draw > 1 AQuestions:Does anyone have suggestions for diagnosing category D?For desoldering the SD card holders with hot air, should I make a shield for the rest of the board?

author: aargee
author_rank: Frequent Contributor
timestamp: October 14, 2015, 02:27:06 am
content: As far as de-soldering, I used a small hot air nozzle, but the old socket pretty much fell apart while removing it.You might want to direct the the hot air away from the display connector on the opposite side. It gets a bit crusty looking if you don't (like one of mine does now).

author: wraper
author_rank: Unknown
timestamp: October 14, 2015, 02:28:20 pm
content: Quote from: edavid on October 14, 2015, 02:20:00 amFirst of all check the voltages after DC/DC converters. Also if everything OK with micro SD sots.QuoteNot needed unless you do something insane.

author: wraper
author_rank: Unknown
timestamp: October 14, 2015, 02:30:21 pm
content: Quote from: wraper on August 22, 2015, 02:20:18 am

author: Monkeh
author_rank: Super Contributor
timestamp: October 14, 2015, 02:38:13 pm
content: High quality boards these, eh?Love that bare die coming back to bite in new ways!

author: edavid
author_rank: Super Contributor
timestamp: October 14, 2015, 04:21:07 pm
content: Quote from: wraper on October 14, 2015, 02:28:20 pmIs there a diagram that shows the voltage measurement points? I searched for one and failed

author: Macbeth
author_rank: Super Contributor
timestamp: October 14, 2015, 05:32:12 pm
content: Near the micro USB PWR IN, the supply rail capacitors:C3/U4 3.3vC100 1.8vC162 5VC163/U16 1.2vTheres also the GPIO pins for 5V and 3.3V

author: edavid
author_rank: Super Contributor
timestamp: October 17, 2015, 02:39:32 am
content: Quote from: wraper on October 14, 2015, 02:30:21 pmIn my case, the boards with this symptom all have a bad 1.2V supply, but I couldn't see any physical damage to U16.Quote from: Macbeth on October 14, 2015, 05:32:12 pmThat's actually 5V, the 3.3V is on C1 (or the GPIO pins as you pointed out). Anyway, thanks.

author: wraper
author_rank: Unknown
timestamp: October 17, 2015, 06:05:45 am
content: Quote from: edavid on October 17, 2015, 02:39:32 amIIRC I had one board with U16 being faulty but not cracked, that IC actually had pass element shorted. Therefore there was very high current through Broadcom soc which caused PSU to cycle because of overload. Crack might be impossible to see without using microscope.

author: Kjelt
author_rank: Super Contributor
timestamp: October 17, 2015, 08:10:02 am
content: Just wondering, are the endtests at the Pi fab so bad or are most of these faults due to shipping or user error?

author: wraper
author_rank: Unknown
timestamp: October 17, 2015, 08:37:03 am
content: except only 2 boards out of 24 faulty ones I had, all almost certainly failed because of the user abuse.

author: Macbeth
author_rank: Super Contributor
timestamp: October 17, 2015, 09:57:44 am
content: Quote from: edavid on October 17, 2015, 02:39:32 amAh, yes. I must update my contemporaneous note.