first off - i'm new to this forum and pretty cherry with electronics in general. so i made the mistake of diagnosing a bad sustain board on our LG plasma (it was shorted to ground - so a pretty easy diagnosis), and my wife saw how simple it was to fix and told the whole neighborhood that i am some kind of tv repairman (i wish she would brag like that about my prowess in the bedroom)- anyway - the first tvs i got were from neighbors that always help us out and are dealing with chemo right now - so i really want to be able to come through for them. The problem is, i'm a steamfitter and don't know what i'm doing. I exercised all the valves and nothing happened. The tvs are both samsungs, both arent turning on- neither is in the class action list (one year too new) but i am guessing from all the reading that it's the caps issue. It seems like my voltages coming off the main board are correct, nothing is shorted out, and i'm comfortable replacing the caps on the boards to give it a try. My problem and question is - none of them look swollen, bursted or deformed- so am i to replace all of the caps? even the little tiny ones? the one board doesn't have too many, but the other has like 20 on it and most of the replacement cap kits i see look pretty universal and have like a dozen or so. Any general help or direction anyone could offer would be much appreciated...
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Re: what did i get myself into?
Hi, and welcome! Kudos for trying to help out your neighbour!
I would start by starting a new thread in the TV repair section.
Some specific info, model number and some photos of the innards will help us help you.
I just did a quick photoshop for you:Attached FilesLast edited by smason; 05-22-2013, 11:15 AM.36 Monitors, 3 TVs, 4 Laptops, 1 motherboard, 1 Printer, 1 iMac, 2 hard drive docks and one IP Phone repaired so far.... -
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Re: what did i get myself into?
Love it!
You are about to enter into a fixation on fixin! It can be fun and you may make a few extra bux on the side! Just be careful and remember slow is the new fast. Take your time, post on this forum when you get stumped, and learn something along the way.
Good Luck!Last edited by twbranch; 05-22-2013, 01:05 PM.Comment
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Hi guys
I've been getting more air con controller boards of various brands for repair - mainly the ones from the outdoor compressor unit and I realise I have a lot of gaps in my specific knowledge, while being pretty good at electronic repair in general.
Does anyone know of any good resources for information on this sort of repair? I'm hoping here there will be some guys who are experienced in this. I'd specifically like more info on how the controller PCB works, because I expect they are all pretty much the same, and especially how it communicates with the indoor unit (protocols,... -
A very general question, when inject voltage and board draw over 4a and pull down 5v to 1v, but nothing is hot under thermal camera. Can I assume it is layer short? or it could be something very typical that I just have no idea of being a noob. -
I'm not sure if I am posting this in the right spot, I don't have any question or anything specific to one board. I am *kinda* starting out with this kind of work. I have been IT in one role or another for my job the last 30 years, and I am familiar enough with basic board stuff generally speaking. So, I dunno for example if someone told me to find a uart header, or flash some generic tsop8 something, etc I understand that kind of stuff. Point being, I'm not 100% clueless. I just don't have the specific knowledge when it comes to some of these more advanced repairs. I actually have spent the last... -
Hi guys,
Just a general question. Usually on mobile devices/laptops the battery pack consists of lithium ion cells with their +/- tabs welded onto the controller IC. I'm wondering, in general if it can be assumed that one can find a replacement lithium ion cell, is it ok to simply re-use the old controller IC in an attempt to re-build the pack? Or is that controller somehow paired to the cells from the factory?
From my experience it sometimes seems to be hit or miss. Not sure if this is true, but sometimes it's almost as if the controller IC will go to a failsafe... -
Hello there!
I'm curious to know what would happen if you moved the resistors to the other location while viewing a DIMM_SEL in the schematics.
i know if you move all of them to the other location you will be effectively disabling the onboard memory.
but im curious to know what would happen if you ONLY do it for specific ones?
i have a bad ram chip on a laptop motherboard and id rather be able to use that laptop than paying 500 bucks for a new motherboard. and im not good with soldering ram so im not gonna attempt to fix it that way. (not that i know which...
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