Re: Suspension losses

On 1/12/2025 10:33 PM, Jeff Liebermann wrote:

On Sun, 12 Jan 2025 21:11:37 -0500, Frank Krygowski
<frkrygow@sbcglobal.net> wrote:
 

On 1/12/2025 5:13 PM, Jeff Liebermann wrote:

On Fri, 10 Jan 2025 20:01:26 -0500, Frank Krygowski
<frkrygow@sbcglobal.net> wrote:
>

Two days ago, my kid asked me to figure out why an electric blanket
wasn't working. The controller refused to turn on. I opened it and
confirmed that it was getting supply voltage. Beyond that, the pile of
dozens of surface mount electronic components was incomprehensible to
me. I suspect Jeff might have been able to diagnose it, but not me.
Here's a photo:
https://www.flickr.com/photos/16972296@N08/54259119364/in/dateposted-public/

>
I don't think I can do much with just a photograph.  If you have the
maker, model and FCC ID number, I can do better.  Also, some
indication of what it does when the power is applied, such as do the
LED's light.  If the don't light, try again in the dark and see if
they partially light.

>
There was no action at all, no lights, nothing.

 That makes troubleshooting easy.  There has to be a fuse or thermal
circuit breaker in there somewhere.  I can't see one on the PCB
(printed circuit board).  It's a single sided PCB so it's unlikely
that it's hiding on the back of the PCB.  It's either inside the wall
plug, inside some kind of on/off switch box that's in series with the
power cord, or attached to the blanket somewhere.

I did measure 120V on the board where the input wires were soldered in place.
Sorry about the quality of the photo. I took the photo only to show the owner why I wasn't digging deeper into diagnosis.

If you want me to continue, please provide the maker, model number,
and FCC ID if available.

I think you shouldn't bother, but I'll be visiting again this week. If the old unit is still around, maybe I'll bring it home for more detective work.
--
- Frank Krygowski