Question about LG 42LM6200 42 in. 3D LCD HD Cinema Smart TV
Red light flashing no power
Posted by Anonymous on
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Posted on Jan 02, 2017
The power supply board may have failed, and or there is another board that has a short and must also be replaced. The boards are swapped out with known working boards to find out the ones that have failed.
These sets are not supported for service at the component level. The manufactures normally do not sell copies of detailed schematic diagrams for component level troubleshooting.
You can end up spending many hours trying to find failed components even if you were able to determine exactly the failed boards to start with. Then if you do find anything, chances are that you will not be able to purchase the parts unless they are of generic types.
I don't service this particular model, but they are very similar as far as the process of finding defective boards is concerned.
We swap out the bad boards using the process if elimination, then follow the set up procedures from the factory instructions that we have, and using their recommended calibration instruments.
What I can also tell you is that after the set is more than a year or two old, sometimes the replacement boards are no longer available. If the set is under warranty the customer gets a new set of the same or the closest possible model in the same brand name.
When out of warranty, if replacement boards are available the service cost is very expensive. Most of the time it is better to buy a new set when there is failure. If the set is more than a few years old there is a chance it will fail again.
Posted on Apr 26, 2009
You need to check the power supply module DC filter caps and voltages first.
If you are going to DIY and have proper tools and know safety precaution then please read on:
Please see my basic troubleshooting guide here:
Posted on Jul 02, 2010
Check the power supply DC filter caps first, also check the DC output voltages.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:
Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
Please post back what you find.
Please leave rating if it helps.
Posted on Jan 08, 2011
This sounds like a very common issue.
If set is hard to turn on (takes several tries)but will eventually turn on hereis what my guess would be.
Every set has a standby power supplythat is running 7/24 if the set is plugged in and it supplies voltage to theremote circuit that turn on the main power supply for the tv and hence turn theset on.
This is an area where companies cut corners by using lower rated voltage caps.By this I mean Standby usually provides under 10 volts to trigger the seton----what they do is use filter caps rated at say 10 volts max in a circuitwith 9 volts (example)=with the standby on all the time the filter caps(electrolytic caps) dry out and fail.
The problem usually begins where you have to turn set on or or two times andgradually gets worse--takes longer and more tries to get it to come up.
Once on it will stay on until turned off for a period of time.
The caps will begin to work better (regain some of thecapacitance) as they get hot--hence one it is on it will seem ok.
The beauty of this problem is most of themhappen when set is a year or two old (no warranty) and all you have to do islook at the top to locate bad ones.
They are generally black or blue and round and vary in --they have twoconnections each--a + for positive and a - for negative--not unlike a batterywhich in a way they are. The + and - are marked on top and bottom of most boards.
They are easy to replace and not expensive parts.
The tops are silverand metal looking with creases on top and if bad they will be puffed up ontop---tops must be perfectly flat with no brown material leaking top or bottom.
If this is your problem once you id them (make a drawing) you can begin.
Here is the critical part---on each cap is also marked the value like 220uf 10vdc---220 micro farad at 10 volts maximum.
If you find for example 6 puffed up and all are 10 vdc replace them with thesame value capacitance (like the 220 uf) but go up to at least in this case(from 10 volts) to a 16 or higher rated voltage cap.
The only issue is when you go up in voltage rated value the cap is larger sosometimes there is an issue of physical space for the replacement on the boardto fit them in.
The reason they cheapen these sets in this way is if 10 caps and you make25,000 sets there is a considerable savings in parts cost.
They do not care as long as it lasts past the usual one year parts warranty.
I have taken the time to be long winded because this really sounds like it maybe the problem you have.
See attached photo of a typical cap and if you have questions or need advicelet me know.
Look inside the set on the power supply board for bad caps that look like these with the tops puffed up!
Posted on Apr 04, 2012
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