BLF A6 FET+7135 Light Troubleshooting and Mod thread

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hank
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> stuck head

I got mine open by putting a drop of penetrating gun oil (“nano-lube”) and a drop of electronics cleaner/lube (Radio Shack spray can, just a tiny bit) into the groove, drawing it around the whole groove with a toothpick, then leaving the head standing on the bezel overnight. Just a drop. Anything that penetrates into the head will vaporize all over the inside of the reflector and emitter. Don’t overdo it.

At least for mine, I think there was just crap in the threads jamming them — because lots of muscle twisting the thing in a padded vise with padded pliers didn’t budget it at all. Solvent did loosen it up — after leaving it overnight. Then I cleaned it very carefully before putting it back together.

chenko
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chenko wrote:
DB Custom wrote:
It takes the small Omten switch, not difficult to replace but you have to find out what fried it or you’ll just fry the new one too.

I suppose my iron stayed too long and cooked it. It does not click anymore.

I sourced a switch of the same shape, but orange in color, from a Xeno E03. I hope it will endure the amps, but the E03 supported 14500 cells so I hope it will do the job.

djozz
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chenko wrote:
chenko wrote:
DB Custom wrote:
It takes the small Omten switch, not difficult to replace but you have to find out what fried it or you'll just fry the new one too.
I suppose my iron stayed too long and cooked it. It does not click anymore.
I sourced a switch of the same shape, but orange in color, from a Xeno E03. I hope it will endure the amps, but the E03 supported 14500 cells so I hope it will do the job.

Uh oh... I'm sure they must have improved on that at some point, but that orange switch was the weakest link of the Xeno03 back when they first came out three years ago Undecided.

tristanxoxo
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chenko wrote:
OK, so, the switch is FRIED. Maybe I killed it definitively, maybe it was defective beforehand. Any suggestions? Can I cannibalize another light’s switch?

I believe this one will fit right in.

seasam
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I got my new tubes today but they didn’t fix the issue. Anybody else have this happen? I thought this was the fix if your light seems to be ok otherwise.

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tristanxoxo wrote:
chenko wrote:
OK, so, the switch is FRIED. Maybe I killed it definitively, maybe it was defective beforehand. Any suggestions? Can I cannibalize another light's switch?
I believe "this":https://www.fasttech.com/products/0/10007065/1576100-clicky-switch-for-1... one will fit right in.

It will fit, but the thin trace from the middle of the board to the switch lead will have a hard time with the 4+ amps that this light is drawing, the corresponding trace on the BLF-A6 tail board is way wider. I would go for soldering a new 1288 Omten to the existing board.

chenko
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djozz wrote:

tristanxoxo wrote:
chenko wrote:
OK, so, the switch is FRIED. Maybe I killed it definitively, maybe it was defective beforehand. Any suggestions? Can I cannibalize another light’s switch?
I believe this one will fit right in.

It will fit, but the thin trace from the middle of the board to the switch lead will have a hard time with the 4+ amps that this light is drawing, the corresponding trace on the BLF-A6 tail board is way wider. I would go for soldering a new 1288 Omten to the existing board.

I’m on the weakest possible connection with a rather weak smartphone, and have no PC, would you help me sourcing it from one of the usual vendors?

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chenko wrote:
djozz wrote:

tristanxoxo wrote:
chenko wrote:
OK, so, the switch is FRIED. Maybe I killed it definitively, maybe it was defective beforehand. Any suggestions? Can I cannibalize another light’s switch?
I believe this one will fit right in.

It will fit, but the thin trace from the middle of the board to the switch lead will have a hard time with the 4+ amps that this light is drawing, the corresponding trace on the BLF-A6 tail board is way wider. I would go for soldering a new 1288 Omten to the existing board.

I’m on the weakest possible connection with a rather weak smartphone, and have no PC, would you help me sourcing it from one of the usual vendors?


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tristanxoxo
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djozz wrote:

tristanxoxo wrote:
chenko wrote:
OK, so, the switch is FRIED. Maybe I killed it definitively, maybe it was defective beforehand. Any suggestions? Can I cannibalize another light’s switch?
I believe this one will fit right in.

It will fit, but the thin trace from the middle of the board to the switch lead will have a hard time with the 4+ amps that this light is drawing, the corresponding trace on the BLF-A6 tail board is way wider. I would go for soldering a new 1288 Omten to the existing board.

Oh I didn’t realize that. Perhaps he can bypass the trace like Dale does.

dudunphy
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seasam wrote:
I got my new tubes today but they didn’t fix the issue. Anybody else have this happen? I thought this was the fix if your light seems to be ok otherwise.

My post #199:

Quote:
I’ve been pretty busy lately but I wanted to post that I received another 5a and a bare 3d. I tried to lego the bare with two of my anos to no avail. I didn’t put a caliper to anything but used my knife as a depth guide and the bare tail cap is definitely deeper to the “shelf” that meets up with the tube compared to the others. The bare would have no doubt been a d.o.a. had it been anodized.

I would recommend people first ask for a tailcap and/or new tubes as the tube thread length on mine seem consistent. But not the tailcap depth.

Or try the solder blob/paper clip method.

Dustin

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Penetrating oil, rubber, cardboard and pliers did it. Needed rubber again for the driver retaining ring. No sign of problems. Just wired the springs and added heat sink compound around the driver.

Flashlight designers should look at lighthouses and pottery.
这些谁设计的手电筒应该看灯塔,以及在陶器。

djburkes
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DB Custom wrote:
DJ, send it to me and I’ll fix it for you. Even modify it further if you so desire.

(I can only do this occasionally people, if I were rich I’d offer to fix any that don’t meet your satisfaction, but rich I’m not)

Wow, I’ll sure take you up on that offer. PM coming your way.

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FWIW, I tried legoing the anodized and bare versions today. The bare ones were recent, of course, and the anodized ones were from the very first batch.

Everything lego’d fine except the bezels. The bare bezel didn’t work on an anodized head, because the bare threads were too big in diameter and slipped easily over the anodized pill without any need to twist or screw it together. The anodized bezel worked on a bare head though.

At least this much works:

dudunphy
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Nice TK! I didn’t try the bezel. Interesting look huh?

Dustin

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I didn’t get my A6 head replacement today, was hoping I’d come home from work to find it but mailman didn’t even deliver it along with my junk mail…

chenko
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Ok, so I went ahead in the quest for troubleshooting. Clickie as said is trashed, but I checked function by manually linking battery negative to flashlight body.

Now this is weird:
Modes seem to change in succession, but after highest setting, instead of cycling back from lowest, it emits a single flick and turns off.

It also whines on the higher modes.

ReManG
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THAO916 wrote:
I didn’t get my A6 head replacement today, was hoping I’d come home from work to find it but mailman didn’t even deliver it along with my junk mail…

In my opinion, the vendors should find out how to mail something as “junk mail” that way it would ALWAYS get through…. E-packet or J-packet… Nuts on your non-delivery, perhaps your Saturday postal carrier will give you a surprise…

ALL of my links are non-affiliated for your pleasure...

My Reviews

Lithium Ion Battery Safety 101

 

dudunphy
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@ chenko. Yes alot of ours do that. I think tk and pilotdog were discussing how they deal with it. But yours has no moon right? So your getting the flash and then off.

Dustin

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Chenko, seems like it’s the 7135 chip causing that issue. Try touching your soldering iron to each of the legs and getting a better solder joint on the chip… that should clear up the issue.

The whining could also be coming from the chip being cold soldered. If you could place the entire driver on a hot plate (after removing the spring) and re-flow the whole thing at once your issues should be solved. Seems like they’re using a high temp solder paste and then not getting the re-flow hot enough to get good liquid connections.

chenko
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dudunphy wrote:
@ chenko. Yes alot of ours do that. I think tk and pilotdog were discussing how they deal with it. But yours has no moon right? So your getting the flash and then off.

Exactly, no real moonlight mode. And yes again, it flashes and shuts off. So it is aaaa diffused issue? Sad

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While waiting for the supposedly coming replacement head, curiosity got the better of me when I read about the difficulty in taking off the head. So I opened the head without any trouble. That is good news. The problem was that in opening the head, the led “spacer” dropped off and in subsequent closing the head, it de-domed the led. So I put together again without the dome and found out the real trouble. There is no light, not even the few modes I had before the head opening. No light when connecting battery negative to body with paper clip. Everything is tight, even the two retaining rings in tail cap and head. What’s the next troubleshoot step?

Fritz t. Cat
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Try connecting a CR123 or a lithium ion cell with long leads to the + and – points on the star. The bond wires may have come off with the dome.

Flashlight designers should look at lighthouses and pottery.
这些谁设计的手电筒应该看灯塔,以及在陶器。

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Fritz t. Cat wrote:
Try connecting a CR123 or a lithium ion cell with long leads to the + and – points on the star. The bond wires may have come off with the dome.
Must be the bond wires as that’s the only thing that could have gone wrong when the led “locator” made contact in “locating” the led. Thanks.
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You could check resistance right on the star. If you make polarity right you should get a little light from the led. If nothing happens you may need to reflow it.

Dustin

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After the dome is off, the bond wires are extremely easy to break. They basically should not be touched at all, ever, or there is a large risk of breaking them. They’re hair-thin and made of soft metal.

Chances are that’s what happened, and it won’t work again without a new LED.

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Finally got my new head today, most noticeable difference is the longer contact spring. So as usual did a wash down of the light with new head installed, for some reason before fully submerging it (standard personal water proof test) I took a look inside the reflector and there was water in it. Immediately took it out and dried it. Glass was fogging up already.

 

So yeah, learned how to open the head, tape on head and body, lay it real thick and nice then use hand powwah!...Left light on turbo to dry out the inner parts with the reflector off.

 

I tried seating the O-ring in front of the glass, however when I tighten the head the oring gets forced out as there is no groove holding the O-ring under pressure, just a flat shelf.

 

In the end I just applied some superlube to the lens shelf, oring and the portion of the reflector where the o-ring sits on. Seems pretty watertight for now but I do not recommend submerging for prolonged periods.

 

Despite above issues, this is still my favourite EDC currently and my brightest single cell light so far. Needless to say it gets the ooohs and ahhhs from the uninitiated around here 

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xzel87 wrote:
Left light on turbo to dry out the inner parts with the reflector off.

Lucky you!

The reflector is needed to press the ledboard against the body, which gives essential heatsinking. With the reflector removed the board is not pressed down any more and can come loose. With the light on Turbo in this situation there is a significant chance the board will overheat and the led will fry. This has not happened in your light luckily Smile

xzel87
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djozz wrote:

xzel87 wrote:
Left light on turbo to dry out the inner parts with the reflector off.

Lucky you!

The reflector is needed to press the ledboard against the body, which gives essential heatsinking. With the reflector removed the board is not pressed down any more and can come loose. With the light on Turbo in this situation there is a significant chance the board will overheat and the led will fry. This has not happened in your light luckily Smile

Wow it didn't occur to me at all as the LED board appears pretty solidly and accurately fixed to the pill though...I can even see traces of some sort of thermal compound under the cut sections of the board. In fact, I tried wiggling the board with tweezers and it didn't move one bit.

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@xzel87,

I am surprised you did not damage the led bond wires with all your tinkering with the reflector. The reflector hole at bottom holds a small plastic piece that “centers” the led. That’s liable to damage the led bond wires by the rotation of reflector when you screw in the head.

[edit]
See the TK’s post above.

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xzel87 wrote:

Finally got my new head today, most noticeable difference is the longer contact spring. So as usual did a wash down of the light with new head installed, for some reason before fully submerging it (standard personal water proof test) I took a look inside the reflector and there was water in it. Immediately took it out and dried it. Glass was fogging up already.

 

So yeah, learned how to open the head, tape on head and body, lay it real thick and nice then use hand powwah!…Left light on turbo to dry out the inner parts with the reflector off.

 

I tried seating the O-ring in front of the glass, however when I tighten the head the oring gets forced out as there is no groove holding the O-ring under pressure, just a flat shelf.

 

In the end I just applied some superlube to the lens shelf, oring and the portion of the reflector where the o-ring sits on. Seems pretty watertight for now but I do not recommend submerging for prolonged periods.

 

Despite above issues, this is still my favourite EDC currently and my brightest single cell light so far. Needless to say it gets the ooohs and ahhhs from the uninitiated around here 

If you want the o-ring to sit on the shelf you need a slighter bigger diameter o-ring.

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