How to fix this circuit board of submarine toy?

Thread Starter

quique123

Joined May 15, 2015
405
I have a submarine toy of my kid which I'm trying to fix. I believe it got wet.

It's a simple circuit with a flat 1.5v battery, a speaker and the small board with a switch.

How can I troubleshoot this?



toy-01s.jpg

toy-02.jpg
 

ScottWang

Joined Aug 23, 2012
7,397
Your upload file is to big, so I cut it to two files and compressed them to smaller files.
1. What is the front look?
2. How does it works?
3. What is the problem?
4. Please attach another photo for component side.
 

Thread Starter

quique123

Joined May 15, 2015
405
Thanks. And sorry but I was posting from my iPhone and I forgot I was uploading the full res pic.

It's a submarine that has a button, some leds and a speaker (the white cables).

When you press the button it plays sounds and lights up the leds. I'm not sure how it randomizes the tracks it plays (cause I don't see an IC anywhere) but there are about 3 different tracks it plays.

The problem is it doesn't play anything anymore. I press the button but nothing happens, not even a chirp from the speaker.

I put a multimeter leads on the white speaker terminals and pressed the button but no current flows in.
 

Attachments

BR-549

Joined Sep 22, 2013
4,928
I believe the chip is under the black dome.
I would remove battery, cover unit in rice and seal in bag for a couple of days.
Fire it up with new battery.
 

GentleRV

Joined Dec 18, 2010
13
DON"T heat it up with a hair dryer, It becomes to hot and the black plastic cover (in where the chip is) will get loose and the humidity will do the rest.
The advice for the rice bag will work and also just let it dry for a week or so will do the good thing too
 
+3 on the rice. I have had that work for me on far more complex items (cellphone+toilet bowl :) ) I'm sorry, but it's a little funny that what ruined a toy submarine...is it getting wet. ;)
 

Thread Starter

quique123

Joined May 15, 2015
405
Yes, I see the irony. Im not sure why a toy submarine has electronics in it that aren't protected from water.

My first instinct when my kid got it was to take it into the pool but I figure I shouldn't because of the electronics. But one day it got left outside and it rained.
 

studiot

Joined Nov 9, 2007
4,998
Yes even if it looks surface dry, there may be moisture in the interstices of the electronics.

Dry it thoroughly, I usually leave for a few days to a week in free air after scrubbing boards in a washtub.
 
Top