New Atten 858D+ received with faulty display - Page 1
Forum section: electronics / repair

author: anishkgt
author_rank: Frequent Contributor
timestamp: February 11, 2018, 07:52:16 pm
content: So after seeing and reading several reviews of the Atten 858D+ I thought I would also get one.Bought one from evil bay and the item seems to have a faulty display. Would anyone know what the problem is ?Would really appreciate if anyone one could help.BM869sWww.Georgehobby.wordpress.comEquipments: DSO104z, Hakko FX888D, Brymen

author: cowasaki
author_rank: Frequent Contributor
timestamp: February 11, 2018, 08:14:43 pm
content: Without it in front of us it is difficult to say. The 7 segments per digit are clearly causing issue but it is not as easy as that.I could give you one reason, the top segment of the low digit is connected to the right hand lower segment - this is causing that segment to light when the top lowest should be lighting. That is a possible but not particularly lightly reason.It should be quite a simple circuit and I would start by visually checking the soldering for shorts. If there are none visible it could be something like a stray conductor under the multi-segment display or a faulty display. It might be a stray short pretty much anywhere on the board between the driver and the display. If you just bought it would sending it back not be an option?

author: cowana
author_rank: Frequent Contributor
timestamp: February 11, 2018, 08:16:43 pm
content: Unfortunately, it looks like the LED display itself is faulty.These displays have a 'common' pin for each digit - as all three digits are working, this shows the 'common' pin and associated drivers are working.They then have a 'segment' pin for each of the segments (and decimal point) - as the top segment can be seen working on the other digits, it shows that this 'segment' pin and associated driver are working.The repair would be to replace the entire LED display module - can you return it to the manufacturer if it is new?

author: cowasaki
author_rank: Frequent Contributor
timestamp: February 11, 2018, 08:17:53 pm
content: After replying I decided to check for a diagram and here it is:so based on the diagram I would have to agree with Cowana....seems to be a bovine theme going on here

author: shakalnokturn
author_rank: Super Contributor
timestamp: February 12, 2018, 12:45:15 am
content: Is middle digit segment "f" intermittent?

author: CatCow
author_rank: Contributor
timestamp: February 12, 2018, 04:44:09 am
content: Quote from: cowasaki on February 11, 2018, 08:17:53 pmJust your imagination.I would agree with the others, returning would be the best option, but I doubt fixing it would take very long or cost much.

author: Armadillo
author_rank: Super Contributor
timestamp: February 12, 2018, 05:44:02 am
content: Is there such a shop as "Evil Bay"?..... ebay?Used?.....modified?..... or NEW?The way I look at the dismantling.... if you are not returning it, I would suggest that you unsolder the LED display module and IPA clean, and scrub with a tooth brush the top side and bottom side of the whole board and the LED segment display. Just assume there is a invisible conductive liquid film stains on the board.After that, dry it sufficiently.Otherwise, return it under PainPal protection, I suppose...

author: anishkgt
author_rank: Frequent Contributor
timestamp: February 12, 2018, 07:42:49 am
content: Hmmm these displays (CL4031BH) are hard to get, can anyone suggest me a drop in replacement ?Www.Georgehobby.wordpress.comEquipments: DSO104z, Hakko FX888D, Brymen BM869s

author: anishkgt
author_rank: Frequent Contributor
timestamp: February 12, 2018, 02:43:59 pm
content: Quote from: cowana on February 11, 2018, 08:16:43 pmI've contacted the Supplier and Its Chinese new year and they seem to be OFF till the 25th. Waiting to hear from them. so would it possible to replace with any display ?

author: cowana
author_rank: Frequent Contributor
timestamp: February 12, 2018, 02:58:41 pm
content: Any common anode display with the same pinout would be a suitable replacement.

author: anishkgt
author_rank: Frequent Contributor
timestamp: February 12, 2018, 06:46:53 pm
content: Thank you.I found one that is close to the specs. (https://www.ebay.com/itm/Digital-Tube-LED-Display-Red-7-Segment-Module-Common-Anode-Cathode-Display/272590524676?ssPageName=STRK%3AMEBIDX%3AIT&var=571707668128&_trksid=p2055119.m1438.l2649)

author: tooki
author_rank: Super Contributor
timestamp: February 13, 2018, 01:44:17 am
content: No, that’s smaller than what’s in it now.Quote from: anishkgt on February 12, 2018, 07:42:49 amJust look for a common-anode 0.4” (or 0.39”, as they’re often labeled) “3 bit digital tube”. The pinouts seem to be quite universal, but it’s easy to check.That said, if this is a new unit, they should just send you a new one at their expense.

author: floobydust
author_rank: Super Contributor
timestamp: February 13, 2018, 01:49:27 am
content: OP can remove the MCU from the socket and test the LED display.Just put multimeter on diode-test and each segment can be checked.I see two LED faults - dead A seg and shorted other two segments, so I would check the display, in case the MCU is defective.edit:The LED pin numbers are wrong in the previous schematic. Here are the pinouts I have verified.LED display P/N can be CL4031B or HS310401K-24, common anode.

author: anishkgt
author_rank: Frequent Contributor
timestamp: February 13, 2018, 07:42:02 am
content: Quote from: tooki on February 13, 2018, 01:44:17 amThe description is similar to what you’ve said. Or is there something more to look at that I may have missed out.Www.Georgehobby.wordpress.comEquipments: DSO104z, Hakko FX888D, Brymen BM869s

author: tooki
author_rank: Super Contributor
timestamp: February 13, 2018, 01:42:56 pm
content: Quote from: anishkgt on February 13, 2018, 07:42:02 am99% chance it’ll be correct. If the listing has a pinout, you could compare it to be sure. But these things seem to be pretty standardized.

author: anishkgt
author_rank: Frequent Contributor
timestamp: February 13, 2018, 02:20:26 pm
content: The seller has responded so i was thinking of requesting a refund or a replacement. I paid USD89.30/- and free shipping.Are there any difference in Atten brand versus the other ones that has a custom firmware ? like parts availability and durability of the overall product and parts ? Would it be worth getting the other models, if so which one would you suggest ?

author: cowana
author_rank: Frequent Contributor
timestamp: February 13, 2018, 02:36:02 pm
content: Quote from: anishkgt on February 13, 2018, 02:20:26 pmThere's no way of telling what hardware you're going to get - even buying one with the same system part number as someone else could be a totally different board inside.As such, the best option is just to get the cheapest unit you can find that has the options you need (detachable power cord/heat gun cable), and hope for the best when you open it up!

author: anishkgt
author_rank: Frequent Contributor
timestamp: February 13, 2018, 02:39:24 pm
content: Hmmm wrong question i guess.I meant with the custom firmware. Is the custom firmware about the precision of the temp ? and that is all.

author: anishkgt
author_rank: Frequent Contributor
timestamp: February 13, 2018, 02:43:59 pm
content: found one to be a bit different but again what you pay is not what you get.https://www.ebay.com/itm/YIHUA-858D-858D-SMD-Hot-Air-Gun-Rework-Station-Solder-Voltage-220V-heat-gun/182059379989?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D1%26asc%3D20161006000400%26meid%3D4b34e56bdeb743be938b36f18c8e0ad5%26pid%3D100691%26rk%3D6%26rkt%3D10%26sd%3D222056560196%26itm%3D182059379989&_trksid=p2063133.c100691.m4814

author: stj
author_rank: Super Contributor
timestamp: February 14, 2018, 06:58:58 am
content: you need to slow down and go back to the begining,that board has a lot of solder issues.the most obvious is on the pot and buttons.check all the soldering.then pull the processor out of the socket and look at the contacts,and while it's out, use a 3v coincell & wires to check the display segments directly.

author: kelchm
author_rank: Regular Contributor
timestamp: February 14, 2018, 01:11:21 pm
content: Quote from: anishkgt on February 13, 2018, 02:20:26 pmThat's way too expensive for an 858D. I paid less than $60 shipped for my 858D+ from Amazon.https://www.amazon.com/dp/B00P8Z4RPG/ref=cm_sw_r_cp_apa_MtdHAbFZ9JSTM

author: anishkgt
author_rank: Frequent Contributor
timestamp: February 14, 2018, 05:54:19 pm
content: I know a bit too expensive but not all items on amazon would ship to where I reside, in Qatar and if they do a huge shipping charge is added to it.Www.Georgehobby.wordpress.comEquipments: DSO104z, Hakko FX888D, Brymen BM869s

author: anishkgt
author_rank: Frequent Contributor
timestamp: February 14, 2018, 05:59:12 pm
content: Quote from: stj on February 14, 2018, 06:58:58 amI did check those and I found several segments not lighting up.The seller has agreed to ship another one but that would only be after the 26th of feb as it’s Chinese New Year.Www.Georgehobby.wordpress.comEquipments: DSO104z, Hakko FX888D, Brymen BM869s