Author Topic: Any of these smd components a voltage regulator?  (Read 450 times)

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Offline artvandalaiTopic starter

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Any of these smd components a voltage regulator?
« on: December 17, 2024, 10:06:04 pm »
I have a Concept2 rower monitor that doesn't shut down and keeps turning on after being turned off. Any of these smd components a voltage regulator? I tried searching the ids printed on these components but couldn't find much info.
 

Offline fzabkar

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Re: Any of these smd components a voltage regulator?
« Reply #1 on: December 18, 2024, 12:04:20 am »
A voltage regulator would usually have a filter capacitor on the input and another on the output. None of your 3 ICs seem to fit.

TPS61026DRCR, Texas Instruments, 5.0V Output, 1.8-A Switch, 96% Efficient Boost Converter w/ LDO Down-Mode, marking BRD,  QFN-10:
 
https://www.ti.com/lit/ds/symlink/tps61026.pdf

ae-pic-a1.aliexpress-media.com/kf/S8300fb10adcf422885f6501d083a39fev.jpg (photo)

http://markingcodes.com/search/c/brd


UPxxx = 74LVC1G14SE-7

http://markingcodes.com/search/c/upxxx
« Last Edit: December 18, 2024, 12:17:04 am by fzabkar »
 
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Offline MathWizard

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Re: Any of these smd components a voltage regulator?
« Reply #2 on: December 18, 2024, 10:32:08 pm »
So is there a button or something, to just turn off the LCD screen, and it turns off, but then keeps turning back on ?

On all the LCD stuff I worked on lately, there was an MCU with outputs specifically meant for directly driving LCD segments/com's. And only that MCU had final control over output to the LCD. However on the DMM I was working on, there was another MCU, telling the LCD MCU, what to do.

There could be some external logic gate circuit getting mixed up, and turning the LCD back on. I'd want to know where the signals to the LCD come from, what IC, and what other IC's is it connected to ??

Why do you think it's power related ? Have you checked it already with a DMM and know it's related ? Maybe there's a backlight, does it also come back on ?? Maybe the whole unit is powered off to disable it, and power gets sent back to it when it's not supposed to be. If it was something like that, yeah I'd be looking at any enable pins and logic circuits for enable signals.
« Last Edit: December 18, 2024, 10:36:32 pm by MathWizard »
 

Offline artvandalaiTopic starter

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Re: Any of these smd components a voltage regulator?
« Reply #3 on: January 18, 2025, 05:57:41 am »
There is a button to turn the monitor off and back on but when you press it it turn back on a few seconds later.

I'm mostly following the advice from this member who has had this same problem before. His monitor he had problems with was an earlier model so some of the components are different. The member mentions to check and change the voltage regulator.

https://www.c2forum.com/viewtopic.php?f=10&t=185252&p=589699#p586356
 


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