Is my Convoy S2+ Faulty?

44 posts / 0 new
Last post

Pages

AltaLumen
Offline
Last seen: 6 days 12 hours ago
Joined: 02/07/2019 - 23:14
Posts: 21
Location: Calgary, Alberta, Canada
Is my Convoy S2+ Faulty?

New member and new poster here! I’ve been a flashlight fan for a few years but only a lurker until now.

I recently purchased a Convoy S2+ on Gearbest with an XM L2 T6 – 4C emitter and “3 / 5 Modes”. Upon first power on with a brand new and fully charged protected NCR18650GA (protected and wrapped by EVVA, purchased on mtnelectronics), all I get is blinking at approximately 1Hz (see video Dropbox Link

I’ve tried everything – half clicks rapidly many many times, switching on and off and so on and so forth. Nothing results in a steady beam – only blinking! At one point it did begin flashing at a faster rate (maybe 2-3 times faster).

Is this unit a dud or am I missing something?

Jack Kellar
Jack Kellar's picture
Online
Last seen: 1 min 54 sec ago
Joined: 03/09/2014 - 14:21
Posts: 1451
Location: Throwing bolts at anomalies

Welcome to BLF, Alta! Party

Have you tested the new battery in another torch to see if it’s halal? If it’s alright, then it could be a faulty driver. If you could remove the pill and take some shots of it, we should be able to diagnose the issue much faster.

(Quick question: did you pick 3/5 on purpose or was it because it’s all you had available? Because if it’s the latter, sounds like a driver swap is in order. Biscotti is just the tip of the iceberg, and it’s pretty amazing itself Wink )

AltaLumen
Offline
Last seen: 6 days 12 hours ago
Joined: 02/07/2019 - 23:14
Posts: 21
Location: Calgary, Alberta, Canada

Jack, thanks for the response! I’ll have to find some needle nose pliers tomorrow and pull the pill. I chose 3/5 because that’s all that was available… Believe it or not, this is my only 18650 torch. I’ve used the battery in a Nitecore F2 charger/powerbank and it charges my phone just fine, but that’s about all I can say.

If I were to swap the driver, where would be the best place to pick one up?

toddcshoe
toddcshoe's picture
Offline
Last seen: 8 hours 19 min ago
Joined: 01/24/2018 - 23:49
Posts: 1556
Location: Foley, MO

Remove the tail cap and use a piece of wire or something to touch the end of the battery to the raw aluminum edge of the tube. See if you get a steady beam then. Buddy of mine brought over a S2+ a few weeks ago and his tail switch took a dump on him. Replaced it and the problem went away. Might check and see if the retaining ring on both the driver and the tail cap switch is tight as well.

ggf31416
Offline
Last seen: 9 hours 14 min ago
Joined: 02/25/2016 - 17:38
Posts: 196
Location: Uruguay

That’s the low voltage warning. The cause of that if the battery is full would be high electrical resistance (poor contact) somewhere.

In addition to the retainer ring, check that the battery tube is not backwards. The “S2+” text should be towards the tail. It will physically fit if put backwards but contact will be rather poor. It’s also possible that the tail switch is defective.

Henk4U2
Henk4U2's picture
Online
Last seen: 13 min 26 sec ago
Joined: 02/13/2014 - 17:52
Posts: 2501
Location: The heart of the Netherlands (GMT+1)
toddcshoe wrote:
Remove the tail cap and use a piece of wire or something to touch the end of the battery to the raw aluminum edge of the tube. See if you get a steady beam then. Buddy of mine brought over a S2+ a few weeks ago and his tail switch took a dump on him. Replaced it and the problem went away. Might check and see if the retaining ring on both the driver and the tail cap switch is tight as well.

This suggestion is definitely a first step in finding the cause. It helps to pinpoint the trouble to the head-section or to the tail-section. FWIW, this light occasionally has troubles if the switchboard is a fraction to large, it does not properly “sink in” the retaining ring of the tailcap assembly. Giving the retaining ring an extra nudge might help.

Please elaborate on the properties of the light. Is it a light with a rubber tailcap or a metal tailcap. Also specify the capacity of the driver. If it is an AMC7135*6 or AMC7135*8 driver, it is soldered to the pill. So no need for tightening a retaining ring on that end. Because there is none.

I always think long and hard before I say something really stupid.

toddcshoe
toddcshoe's picture
Offline
Last seen: 8 hours 19 min ago
Joined: 01/24/2018 - 23:49
Posts: 1556
Location: Foley, MO
Henk4U2 wrote:
toddcshoe wrote:
Remove the tail cap and use a piece of wire or something to touch the end of the battery to the raw aluminum edge of the tube. See if you get a steady beam then. Buddy of mine brought over a S2+ a few weeks ago and his tail switch took a dump on him. Replaced it and the problem went away. Might check and see if the retaining ring on both the driver and the tail cap switch is tight as well.

This suggestion is definitely a first step in finding the cause. It helps to pinpoint the trouble to the head-section or to the tail-section. FWIW, this light occasionally has troubles if the switchboard is a fraction to large, it does not properly “sink in” the retaining ring of the tailcap assembly. Giving the retaining ring an extra nudge might help.

Please elaborate on the properties of the light. Is it a light with a rubber tailcap or a metal tailcap. Also specify the capacity of the driver. If it is an AMC7135*6 or AMC7135*8 driver, it is soldered to the pill. So no need for tightening a retaining ring on that end. Because there is none.

Brain fart on my end, forgot about the different chip quantities. Facepalm

AltaLumen
Offline
Last seen: 6 days 12 hours ago
Joined: 02/07/2019 - 23:14
Posts: 21
Location: Calgary, Alberta, Canada

Great suggestions – thanks guys! I will check this tonight and report back.

AltaLumen
Offline
Last seen: 6 days 12 hours ago
Joined: 02/07/2019 - 23:14
Posts: 21
Location: Calgary, Alberta, Canada

Henk4U2, it has a metal tail cap and switch, not the rubber/silicone covered one. It has 8× 7135 chips. I’ll check the tail cap retaining ring per toddcshoe’s suggestion tonight, as well as jumpering the battery’s end directly to the body of the flashlight. The tail cap switch itself seems to function fine, at least based on feel, which probably isn’t saying much, but we’ll see.

AltaLumen
Offline
Last seen: 6 days 12 hours ago
Joined: 02/07/2019 - 23:14
Posts: 21
Location: Calgary, Alberta, Canada

Well, it isn’t the tail cap or switch. I jumpered the negative end of the battery to the body of the torch and got the same result – blinking light.

How do I remove the driver from the head? needle nose pliers? Driver Pic

Jack Kellar
Jack Kellar's picture
Online
Last seen: 1 min 54 sec ago
Joined: 03/09/2014 - 14:21
Posts: 1451
Location: Throwing bolts at anomalies

AltaLumen wrote:
Well, it isn’t the tail cap or switch. I jumpered the negative end of the battery to the body of the torch and got the same result – blinking light.

How do I remove the driver from the head? needle nose pliers? !https://www.dropbox.com/s/xrs9hwca2gan706/IMG_8290.JPG?dl=0!


Unscrew the head. You’ll see the pill in there, use the needlenose pliers to screw it off. I’m guessing the driver is soldered to the pill instead of held with a retaining ring – if it is you’ll have to de-solder it with an iron, otherwise use the pliers to unscrew the retaining ring.

AltaLumen
Offline
Last seen: 6 days 12 hours ago
Joined: 02/07/2019 - 23:14
Posts: 21
Location: Calgary, Alberta, Canada

Okay, I removed the pill with needle nose pliers – now what…

Driver pic
LED

The only thing visually apparent is that the LED board separated from the pill slightly. There’s thermal transfer compound between the LED board and the pill surface, but they weren’t touching. The board is just floating a little above the pill. Is that an issue? I assume not as it must compress together once it’s pressed against the reflector in the body.

Is it worth de-soldering everything at this point and re-soldering the four connection points? I’ll be honest – I have very little soldering experience and my iron is a piece of junk. Perhaps it’s time to invest in a new one.

Macka17
Offline
Last seen: 7 hours 31 min ago
Joined: 05/08/2017 - 02:31
Posts: 439
Location: Queensland Australia

Battery fine. Contact Gearbest.
I’ve had 2 faulty items from them over the yrs (torches)
Under $20AUD.
Coupla Photo’s. Instant changeover. No quibbling.
Don’t bother returning old.

AltaLumen
Offline
Last seen: 6 days 12 hours ago
Joined: 02/07/2019 - 23:14
Posts: 21
Location: Calgary, Alberta, Canada

They’ve already refunded my money – I was just wondering if it’s worth trying to resurrect.

Jack Kellar
Jack Kellar's picture
Online
Last seen: 1 min 54 sec ago
Joined: 03/09/2014 - 14:21
Posts: 1451
Location: Throwing bolts at anomalies

AltaLumen wrote:
They’ve already refunded my money – I was just wondering if it’s worth trying to resurrect.

It is if you get a driver from Simon at Convoy’s Ali store. You can purchase Biscotti drivers at whatever number of 7135s you want at a very good price. The S2+‘s host is practically a legend, and worth experimenting with.

Also yeah, it’s a good idea to get a better iron. My brother and I struggled quite a bit with a weak one that didn’t even melt the solder right, so I went ahead and got a decent 60w one in my following trip to the hardware store. All is good in the neighborhood for future driver or emitter swaps.

BlueSwordM
BlueSwordM's picture
Online
Last seen: 1 min ago
Joined: 11/29/2017 - 12:34
Posts: 3122
Location: Canada

Yep. Always get Convoy lights directly from the manufacturer:
https://www.aliexpress.com/store/product/Gray-Convoy-S2-with-luminus-SST...

Here’s the soldering iron I use:
https://www.banggood.com/PX-988-90W-Backlight-LCD-Digital-Thermostat-Adj...

It works very well.

My very own high current Beryllium Copper springs: http://budgetlightforum.com/node/64047
Liitokala Aliexpress Stores Battery Fraud: http://budgetlightforum.com/node/60547

AltaLumen
Offline
Last seen: 6 days 12 hours ago
Joined: 02/07/2019 - 23:14
Posts: 21
Location: Calgary, Alberta, Canada

Thanks for all of the help, guys.

I went ahead and ordered a 7135 ×8 driver w/ Biscotti firmware to replace the one that is presumably faulty in the S2+ I purchased from Gearbest.

and a Convoy S2+ with the SST-20 4000k emitter and 7135 ×4 driver with Biscotti firmware.

Jack Kellar
Jack Kellar's picture
Online
Last seen: 1 min 54 sec ago
Joined: 03/09/2014 - 14:21
Posts: 1451
Location: Throwing bolts at anomalies

AltaLumen wrote:
Thanks for all of the help, guys.

I went ahead and ordered a 7135 ×8 driver w/ Biscotti firmware to replace the one that is presumably faulty in the S2+ I purchased from Gearbest.

and a Convoy S2+ with the SST-20 4000k emitter and 7135 ×4 driver with Biscotti firmware.


Beautiful. I got that exact driver to replace the 3/5 I had on my first S2 – I have another one with 7135×6 Biscotti but this one has sentimental value (and the LED tint is rosier and nicer) –, and since I did the swap I’ve been enjoying it a lot. It’s been my go-to biking light in these final days of Daylight Savings Time when it’s complete darkness before 6AM (I leave the house between 5:30 and 5:45AM, when there’s barely a hint of dawn in the sky).

Just be careful not to run it pell mell at 100% power too long, the S2+ doesn’t have the cooling potential to safely maintain that much output. I like to keep my S2 at mode group 8 (max mode 50% of full power) and will do the same when my Nichia S2+ gets to me.

AltaLumen
Offline
Last seen: 6 days 12 hours ago
Joined: 02/07/2019 - 23:14
Posts: 21
Location: Calgary, Alberta, Canada

Yeah, I’ll probably leave it on mode 8 as well. How do you find the 7145 ×6? Are you able to leave it at 100% for any longer?

When on 50% power with the 7135 ×8 can you run it continuously?

Cheers!

SIGShooter
Offline
Last seen: 8 hours 20 min ago
Joined: 07/14/2013 - 02:10
Posts: 1223
Location: northern california

AltaLumen wrote:
Yeah, I’ll probably leave it on mode 8 as well. How do you find the 7145 ×6? Are you able to leave it at 100% for any longer?

When on 50% power with the 7135 ×8 can you run it continuously?

Cheers!


It depends. I had a 7145 ×6 turn on in my jacket by accident and it was too hot to hold after it was on for guessing 5 to 10 minutes. I had to hold it with my jacket sleeve just to be able to turn it to off. But holding it in my hand on other occasions, it was hot but bearable to hold.
AltaLumen
Offline
Last seen: 6 days 12 hours ago
Joined: 02/07/2019 - 23:14
Posts: 21
Location: Calgary, Alberta, Canada

I see, so it depends whether or not it’s connected to the human heat sink. Smile cool.

Jack Kellar
Jack Kellar's picture
Online
Last seen: 1 min 54 sec ago
Joined: 03/09/2014 - 14:21
Posts: 1451
Location: Throwing bolts at anomalies

AltaLumen wrote:
Yeah, I’ll probably leave it on mode 8 as well. How do you find the 7145 ×6? Are you able to leave it at 100% for any longer?

When on 50% power with the 7135 ×8 can you run it continuously?

Cheers!


I’d gone for it for heating reasons, but once I found a temperature test that indicated an S2+ in x6 reaching the same risky max temperature as x8 but a bit slower, I decided “bugger it” and went for x8 when I got the new drivers. I did notice the x8 being marginally brighter than the x6 on 10% mode and above.

On 50% it’s like you’re running a 7135×4 at full blast, which is very much tried and safe. During my 15-ish minute morning commute, it doesn’t even get warm. And the battery lasts forever. Not bad at all for swapping about 25% perceived brightness for more or less 2 more hours of runtime LOL

DOC1500
DOC1500's picture
Offline
Last seen: 3 hours 59 min ago
Joined: 01/19/2019 - 10:18
Posts: 29
Location: Clarks Summit, Pennsylvania

AltaLumen wrote:
Thanks for all of the help, guys.

I went ahead and ordered a 7135 ×8 driver w/ Biscotti firmware to replace the one that is presumably faulty in the S2+ I purchased from Gearbest.

and a “Convoy S2+ with the SST-20 4000k emitter and 7135 ×4 driver with Biscotti firmware”:https://www.aliexpress.com/store/product/Gray-Convoy-S2-with-luminus-SST....


I ordered from AliExpress the same above ^^^
(2)S2+ 7135×8 And
(1)S2+ 7135×3
Two weeks ago and found out they’re on Chinese New Year vacation for a month. I think they’ll be back the 12th February

A lie is a lie even if everybody believes it.. The truth is the truth even if nobody believes it.
John 3:16 --
2 Cor 5:17

AltaLumen
Offline
Last seen: 6 days 12 hours ago
Joined: 02/07/2019 - 23:14
Posts: 21
Location: Calgary, Alberta, Canada

Nice. I’m looking forward to a high quality 4000 kelvin light. The SST-20 also looks to be efficient, with a higher lumen output than the 219C, I think.

Lexel
Lexel's picture
Offline
Last seen: 1 hour 40 min ago
Joined: 11/01/2016 - 08:00
Posts: 4664
Location: Germany

most things with LVP faults come from a defect on the voltage divider,
the S2+ should have 19.1k and 4.7k to generate about 0.7V on MCU pin 7 which gets compared to a internal voltage reference
it happens that one resistor end is not correctly reflow soldered and does not give electrical contact, as the LVP ready low this has to be on the 19.1k resistor

toddcshoe
toddcshoe's picture
Offline
Last seen: 8 hours 19 min ago
Joined: 01/24/2018 - 23:49
Posts: 1556
Location: Foley, MO
AltaLumen wrote:
Nice. I’m looking forward to a high quality 4000 kelvin light. The SST-20 also looks to be efficient, with a higher lumen output than the 219C, I think.

I have a Samsung LH351D 5000K 90cri I believe. A friend bought a bunch and sent a few my way. I can send you one on a 16mm Mountain board if you would like to try it out. No charge or anything. I don’t have any 4000K emitters but I don’t mind flowing a emitter on a board for you if it would make your light more enjoyable. Just PM an address and I can get it in the mail sometime tomorrow.

I put that emitter in a few of my Jetbeam Jet-I MK and they are quite pleasant.

AltaLumen
Offline
Last seen: 6 days 12 hours ago
Joined: 02/07/2019 - 23:14
Posts: 21
Location: Calgary, Alberta, Canada

Lexel, my technical expertise is wood science (it’s true! Lol), so, I immensely appreciate your response, but have no idea what it means. Smile

Lexel
Lexel's picture
Offline
Last seen: 1 hour 40 min ago
Joined: 11/01/2016 - 08:00
Posts: 4664
Location: Germany
AltaLumen wrote:
Lexel, my technical expertise is wood science (it’s true! Lol), so, I immensely appreciate your response, but have no idea what it means. Smile

go to your garage
take a soldering iron, with a small tip
stick it to the tiny part with 28C or 223 marking on both sides and see if that fixes the problem
holding the resistor with tweezers is helpful if you hit the good side it becomes loose if other is not soldered right

RobertB
RobertB's picture
Offline
Last seen: 2 hours 52 min ago
Joined: 12/18/2015 - 17:49
Posts: 3006
Location: USA, Michigan

Somewhat suspicious of the EVVA cell. This guy’s D4s with a EVVA 26650 is doing the exact same thing, and purchased from the same place. Probably just a coincidence though

You won’t hit 3A charging a cell phone like you would on the flashlight

AltaLumen
Offline
Last seen: 6 days 12 hours ago
Joined: 02/07/2019 - 23:14
Posts: 21
Location: Calgary, Alberta, Canada

Toddcshoe, that’s incredibly generous! I’d love to try that! I’m such a newbie that I have to ask what diameter this would be? Would it fit in the S2+?

AltaLumen
Offline
Last seen: 6 days 12 hours ago
Joined: 02/07/2019 - 23:14
Posts: 21
Location: Calgary, Alberta, Canada
Lexel wrote:
AltaLumen wrote:
Lexel, my technical expertise is wood science (it’s true! Lol), so, I immensely appreciate your response, but have no idea what it means. Smile

go to your garage
take a soldering iron, with a small tip
stick it to the tiny part with 28C or 223 marking on both sides and see if that fixes the problem
holding the resistor with tweezers is helpful if you hit the good side it becomes loose if other is not soldered right

Interesting. I’ll try that tomorrow if possible. I’ll PM you wish quesrions I’d o ya e any troubles :-/. Thanks so much

EDIT: yikes, I only had one beer when I wrote that – I swear…

Interesting. I’ll try that tomorrow if possible. I’ll PM you wish questions if I have any troubles :-/. Thanks so much!

Pages