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How to check the components of the soldered kit?
Moderators: adafruit_support_bill, adafruit

How to check the components of the soldered kit?

by Jens on Sat Sep 29, 2012 3:09 pm

I just finalize my second TV-B-Gone kit. When I pressed the button (or insert the battery) the green LED is only blinking few times (not flashing like a code signal).
I checked the processor (with the first kit) - it works.
First the infrared-LED slowly blinked (check with digicam) - but now nothing just the green.
The ceramic oscillator may be faulty?
How can I check all electronic components with my e.g. multimeter?

Thanks.
Jens
 
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Re: How to check the components of the soldered kit?

by adafruit_support_bill on Sat Sep 29, 2012 7:06 pm

Most problems come down to soldering. If you post clear photos of the front & back of the board we will take a look.

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Re: How to check the components of the soldered kit?

by Jens on Sun Sep 30, 2012 7:30 am

Dear Support,

adafruit_support wrote:Most problems come down to soldering. If you post clear photos of the front & back of the board we will take a look.

Hopefully clear enough:
Attachments
Jens_TVBG_back pseudo3D.GIF
Jens_TVBG_back pseudo3D.GIF (267.33 KiB) Viewed 2044 times
Jens_TVBG_back.jpg
Jens_TVBG_back.jpg (371.46 KiB) Viewed 2044 times
Jens_TVBG_front.jpg
Jens_TVBG_front.jpg (302.17 KiB) Viewed 2044 times
Jens
 
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Re: How to check the components of the soldered kit?

by adafruit_support_bill on Sun Sep 30, 2012 5:38 pm

A couple suspicious joints on the ICSP header, but that shouldn't affect normal operation.
Are you using a fresh battery? That symptom is consistent with a weak battery.

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Re: How to check the components of the soldered kit?

by Jens on Tue Oct 02, 2012 2:22 pm

Yes, the batteries are fresh. I checked it with an other TV-B-Gone.
And, I re-soldered (melded) all pins.
So, back to my first question. How can I check the single elements?
A link forward to a wiki or - old school - a book will be fine.
Jens
 
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Re: How to check the components of the soldered kit?

by adafruit_support_bill on Tue Oct 02, 2012 3:18 pm

It is difficult to test individual components once they are soldered into a circuit. What test equipment do you have access to? You can verify the operation of the oscillator with an oscilloscope or a frequency counter. With a multimeter, you can check that the battery voltage stays relatively constant. If the voltage sags significantly during operation, that would indicate a short or damaged component somewhere. Those can often be located by feeling for what is getting hot.

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Re: How to check the components of the soldered kit?

by adafruit_support_rick on Tue Oct 02, 2012 3:47 pm

I suggest double checking that you installed the right transistor at Q5. The 5 transistors all look alike, but Q5 is a very different part. Q1, Q2, Q3, and Q4 are NPN transistors and should all have the same markings, while Q5 is a PNP, and will have different marking.

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Re: How to check the components of the soldered kit?

by Jens on Mon Oct 08, 2012 2:28 pm

Thanks to driverblock,
Yes of cause I double checked before I posted. Every component is at there right place.
4 equal transistor "PN2222A" close to the LED and the single transistor "PN2907" at the single place.

Thanks to adafuit_support,
Yes I have only a multimeter. I checked the lack of voltage, it fall only from 5V (4 x 1.2V AAA accu) to 4,8V while I pressed the reset button.
So, my next steps are to re-solder single components and solder it in an existing (working) TV-B-Gone or give google a try.
Jens
 
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