PM5 Display Won't Turn On

Maintenance, accessories, operation. Anything to do with making your erg work.
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Carl Watts
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Re: PM5 Display Won't Turn On

Post by Carl Watts » October 30th, 2024, 5:27 am

lynxss1 wrote:
October 30th, 2024, 1:53 am
Yeah its fine, i have a microscope, hot air rework station, hakko soldering iron for the job. Could you please share the part number of the switching regulator?
You probably want to verify its faulty. In my case it was hot to the touch and the PM5 was drawing a massive 800mA so it had an internal short.

I would look at what sort of current its drawing using a 3Vdc supply as it tells you a lot as to whether the micro is working. Should be about 35mA from memory and in shutdown it drops to like 0.060mA or about the same level as the old PM2. Sometimes the Micro just dies and you will see a low current draw and nothing happening on screen.

The part number is something like AS1337 or AS1525 for the regulator. There is a top mark code on the chip. Both parts are possibly interchangeable.

https://www.digikey.com/en/htmldatashee ... 0/1/as1337
Carl Watts.
Age:56 Weight: 108kg Height:183cm
Concept 2 Monitor Service Technician & indoor rower.
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