Electronics help

tres · 30 Dec 2016 at 11:10

What would you call these little tiny thingys on this PCB?
As you can see (or not, apologies for the potato photo), one has fallen off, and I'm guessing this is the reason my thermostat remote is no longer working.

Is it possible to buy these using the only information on the tiny things - "106"? If so, I might have a go at soldering one on...

Thanks!

Big image:

Hades · 30 Dec 2016 at 11:12

It's either a 106 or possibly a 901. The bigger question is which way round do you solder it back on??????

Sorry I can't help

paradigm · 30 Dec 2016 at 11:15

It'll be a surface mount resistor with a EIA-96 3-digit code (106).

The direction of mount makes no difference, it's not a diode

Terminal_Boy · 30 Dec 2016 at 11:20

That is a 10MOhm surface mount resitor.

http://www.resistorguide.com/resistor-smd-code/

Maplin or Radio Spares will sell them. You'll need a low Wattage soldering iron with a very fine tip and some solder braid to clean the pads on the PCB where the old one broke off.

Use the lowest heat possible.

tres · 30 Dec 2016 at 11:24

Thank you chaps, much appreciated! I will attempt soldering for the first time. Worth the try considering these old units are about 50 quid anyway

Diddums · 30 Dec 2016 at 11:26

This is why I love this forum. There are nerds available in every flavour

paradigm · 30 Dec 2016 at 11:50

Diddums said:
This is why I love this forum. There are nerds available in every flavour

The way I look at it is that everyone is (usually) a geek about some topic or other!

Diddums · 30 Dec 2016 at 11:52

Exactly, there's always something who knows the answer, this place is a wealth of information and helpful people.

And hilly.

neodude · 30 Dec 2016 at 15:15

Keep in mind that SM resistors also come in different physical sizes. The ones in your picture look like 0805s but you are probably better measuring them before ordering.

Tealc · 30 Dec 2016 at 15:38

Just for reference an 0805 SMD is 2mm x 1.25mm. You could likely get away with a slightly larger 1206 on that 0805 pad if you struggle to solder up a 2mm part.

Rroff · 30 Dec 2016 at 15:58

Tealc said:
Just for reference an 0805 SMD is 2mm x 1.25mm. You could likely get away with a slightly larger 1206 on that 0805 pad if you struggle to solder up a 2mm part.

Alternatively could probably solder a through hole resistor (using blutak to hold in place temporarily) onto the left hand pad and onto the hole further down the trace assuming nothing would be in the way.

Something like this: