7135 Troubleshooting

5 posts / 0 new
Last post
allcool
Offline
Last seen: 16 hours 3 min ago
Joined: 06/20/2016 - 10:30
Posts: 160
Location: Miami
7135 Troubleshooting

Soldered on 4, 380’s on a Mtn 105 driver like usual.

The math didn’t add up like it usually does. Seems to be missing the extra current of the 12th 7135 chip.
I know its probably my solder job, but they all look good(?) is there an easy way to detect which one is not working..?

Swib
Offline
Last seen: 6 hours 41 min ago
Joined: 12/31/2015 - 19:21
Posts: 159
Location: Ontario, Canada

Yes you can check continuity between the chips that you soldered against the chips already on board. Measure resistance between each pin on the ones you soldered against the same pin on another 7135. Should be near zero. When you find the one that isn’t, resolder.

If you don’t like what it looks like on the wall, take it outside.

Lexel
Lexel's picture
Offline
Last seen: 10 hours 31 min ago
Joined: 11/01/2016 - 08:00
Posts: 3123
Location: Germany

it is also possible that one 7135 is dead, even if its soldered OK
there is no way to find a dead or leaking one without unsoldering till you find it

[Reviews] Miboxer C4-12, C2-4k+6k, C2, C4 / Astrolux K1, MF01, S42, K01 / BLF Q8 / Kalrus G35, XT11GT / Nitefox UT20 / Sofirn SF36, SP35 / Imalent DM21TW / Wuben I333 / Ravemen PR1200 / CL06 lantern / Xanes headlamp

[Mods] Skilhunt H03 short / Klarus XT11GT, XT12GTS / Zebralight SC50+Imalent DM21TWcolorful anodisation

[Sale] TA drivers Narsil or Bistro / Remote switch tail DD board with FET

allcool
Offline
Last seen: 16 hours 3 min ago
Joined: 06/20/2016 - 10:30
Posts: 160
Location: Miami

Thanks guys, found my problem. Solder looked good, but wasn’t.

Thanks for the advice on finding the leg without continuity…

Lightbringer
Lightbringer's picture
Offline
Last seen: 2 hours 40 min ago
Joined: 08/30/2016 - 14:12
Posts: 3168
Location: nyc

Yeh, and being that they’re all parallelled, just stick the probe in one place (ground, output, input) on a pc trace, and just touch each chip at the right pin.

09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0