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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: Suspension losses
Date: Mon, 13 Jan 2025 10:36:32 -0600
Organization: Yellow Jersey, Ltd.
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On 1/13/2025 10:06 AM, Frank Krygowski wrote:
> 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.
> 

One ever popular technique to resolve intractable electronics:

https://www.yellowjersey.org/photosfromthepast/FIXCOMPU.JPG


-- 
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971