Hi,
I'm trying to fix my mum's Logitech UE Smart Radio (which is a rebranded Squeezebox Radio). It suddenly stopped working and after opening it up, I quickly spotted this resistor Q3 which has obviously gone to heaven:
The thing is that I can't seem to find any schematics for this device. Besides, the resistor spec can't be read from the now fried package.
Is there perhaps any way of making an educated guess or somehow determining a safe replacement part?
Replacing a fried SMT transistor without having schematics
Re: Replacing a fried SMT transistor without having schematics
Hard to tell what's going on.. Might be voltage regulator
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
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https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: Replacing a fried SMT transistor without having schematics
Am thinking the same based on the track thickness etc. Looks like a voltage regulator. Could it be similar to Q5 above.
EDIT: if it is similar to Q5 above that has a Z4 marking which is either a zener diode or transistor - http://www.s-manuals.com/smd/z4
Re: Replacing a fried SMT transistor without having schematics
Looks like a common fault.
https://forums.slimdevices.com/showthre ... post918596
https://forums.slimdevices.com/showthre ... post862112
https://forums.slimdevices.com/showthre ... post918596
https://forums.slimdevices.com/showthre ... post862112
A1200 rev 1B & 1230-IV 50MHz / CPC 6128 / CPC 464 / ZX Spectrum 48K / ZX81
Re: Replacing a fried SMT transistor without having schematics
Ah, that's quite right. So much for my Google skillsxyzzy76 wrote: ↑Sat Nov 14, 2020 12:04 pm Looks like a common fault.
https://forums.slimdevices.com/showthre ... post918596
https://forums.slimdevices.com/showthre ... post862112
I'm thinking of removing the amp chip (+connect S&D at Q3) and see if it powers up again.
Re: Replacing a fried SMT transistor without having schematics
I mean, I could always run the headphone output through a cheap digital amp circuit and connect it to the speakers. Though I'd have to make sure it can drive a woofer and a tweeter separately.