Help! Weird led condition!

[Zackfoo]

This is a pok3r keyboard. Added led and this happen. Polarity is check which is correct and also led is working I check that too. Anyone can let me know how to fix this?

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[Moistgun]

Can you take a picture of the back side of the pcb and post that?

Try for better quality, or a bunch of closer and steadier pics.

[Zackfoo]

Can you take a picture of the back side of the pcb and post that?

Try for better quality, or a bunch of closer and steadier pics.

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[Zackfoo]

First picture is the one with 4 leds that does not light up

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[Moistgun]

have you tried to reflow the solder on those four leds?

weird that it would be those in a row though.

[Zackfoo]

have you tried to reflow the solder on those four leds?

weird that it would be those in a row though.

I did testing without solder on all switch before installing. It light up normally if I force the pin the touch the wall. Only those 4 does not work even so.

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[tp4tissue]

have you tried to reflow the solder on those four leds?

weird that it would be those in a row though.

I did testing without solder on all switch before installing. It light up normally if I force the pin the touch the wall. Only those 4 does not work even so.

Sent from my SM-G935F using Tapatalk

Use the resistance setting on ur multimeter, do the leds light up (at all)

[Zackfoo]

have you tried to reflow the solder on those four leds?

weird that it would be those in a row though.

I did testing without solder on all switch before installing. It light up normally if I force the pin the touch the wall. Only those 4 does not work even so.

Sent from my SM-G935F using Tapatalk

Use the resistance setting on ur multimeter, do the leds light up (at all)

Do not have multi meter. But it does can I put again at other on pin holes

Sent from my SM-G935F using Tapatalk

[tp4tissue]

have you tried to reflow the solder on those four leds?

weird that it would be those in a row though.

I did testing without solder on all switch before installing. It light up normally if I force the pin the touch the wall. Only those 4 does not work even so.

Sent from my SM-G935F using Tapatalk

Use the resistance setting on ur multimeter, do the leds light up (at all)

Do not have multi meter. But it does can I put again at other on pin holes

Sent from my SM-G935F using Tapatalk

take a double-a battery, or triple-a,  doesn't matter,   tape 2 copper wires to the battery, 

LEDs have polarity, so it only lights up in one direction,   try both directions.. 

[cribbit]

It's really hard to diagnose these without a multimeter to check that all the connections are working properly.

[Data]

Do you have a coin cell battery?

You can wedge one between the legs on the LED to verify that it works and to check polarity.  Most coin cells don't supply enough current to blow an LED but more than enough to energize it.  I use a CR1632 at home to check all my LEDs.

[tp4tissue]

Do you have a coin cell battery?

You can wedge one between the legs on the LED to verify that it works and to check polarity.  Most coin cells don't supply enough current to blow an LED but more than enough to energize it.  I use a CR1632 at home to check all my LEDs.

what;s wrong with a double a.. hahahaha

[xondat]

Do you have a coin cell battery?

You can wedge one between the legs on the LED to verify that it works and to check polarity.  Most coin cells don't supply enough current to blow an LED but more than enough to energize it.  I use a CR1632 at home to check all my LEDs.

what;s wrong with a double a.. hahahaha

Try and fit the two ends of an AA in between the legs of a LED

[Data]

Do you have a coin cell battery?

You can wedge one between the legs on the LED to verify that it works and to check polarity.  Most coin cells don't supply enough current to blow an LED but more than enough to energize it.  I use a CR1632 at home to check all my LEDs.

what;s wrong with a double a.. hahahaha

Try and fit the two ends of an AA in between the legs of a LED

Winner winner.

And you can do this even after it's soldered.  The angle is a little tricky but it works.

[tp4tissue]

Do you have a coin cell battery?

You can wedge one between the legs on the LED to verify that it works and to check polarity.  Most coin cells don't supply enough current to blow an LED but more than enough to energize it.  I use a CR1632 at home to check all my LEDs.

what;s wrong with a double a.. hahahaha

Try and fit the two ends of an AA in between the legs of a LED

AA with 2 wires + tape..

[Data]

Do you have a coin cell battery?

You can wedge one between the legs on the LED to verify that it works and to check polarity.  Most coin cells don't supply enough current to blow an LED but more than enough to energize it.  I use a CR1632 at home to check all my LEDs.

what;s wrong with a double a.. hahahaha

Try and fit the two ends of an AA in between the legs of a LED

AA with 2 wires + tape..

Show Image

Wires?  Tape?  Now you're just getting fancy.

[Zackfoo]

Leds is working. Some other folks just suggest me to route some wires from another led holes. They says that it should be trace problem. That's sad...  But at least it is going to work I don't mind haha. Thx guys for your help! Appreciate it.

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[tp4tissue]

Leds is working. Some other folks just suggest me to route some wires from another led holes. They says that it should be trace problem. That's sad...  But at least it is going to work I don't mind haha. Thx guys for your help! Appreciate it.

Sent from my SM-G935F using Tapatalk

yea double check how the resistors are wired..  don't want to jumper cable at the wrong spots.