Question about Seiki Televison & Video
Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Posted on Dec 19, 2016
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Posted on Jan 02, 2017
SOURCE: sharp aquos lc-37d43u tv
Same problem. TV worked night before and then would turn on but no picture or sound. Power and OPC lights blinking. I couldn't change the channel or get to the menu.
I disconnected the coaxial cable and the power for a few minutes and then plugged it back in (electric) but left the cable off. I got a message that it couldn;t get a signal. At that point I was able to change the channels. I plugged the cable line back in and everything worked fine... Good luck!!!
Posted on Jan 01, 2009
Open the back of the TV,and look at the can shaped items called capacitors on the circuit boards.If any of them have the tops,or bottoms bulged out,they need to be replaced.This should get it working again.I hope this helps.If you have any questions,please let me know.Thank You very much!
Posted on Jun 28, 2009
I concur with Lightnbaby.... had same problem... my TV LNT4042HX/XAA took 10 min to start sometimes... the capacitors on the power supply board had bubbles on top 4 of them all 10/1000Uf. Samsung wanted to charge $220+ to have a guy come out and fix. J&J parts (samsung vendor) wanted $108 for a new board. I replaced the 4 capacitors for $4.68 and the TV works fine now!!!!!
Posted on Mar 29, 2010
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.
Posted on Apr 01, 2012
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