Question about Akai LCT2715 27 in. LCD Television

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Akai LCT 2715

I bought this television from sam's club and I am experiening the popping sound and the blinking red light. How do I fix

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  • Akai Master
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This problem is with fair certainty the power supply.
Modern power supplies are designed to shut down if the current drawn exceeds the design level which indicates that something the supply services or the supply itself has died.

If you are adventurous, you might pull the plug on the set, gain access to the innards, and with good light, inspect any boards inside. If you see one that has few ICs but many more larger discrete parts, this will be the power supply.
You are looking for components called electrolytic capacitors that are almost always cylindrical and mostly installed upright at 90 degrees to the board with leads passing through to the solder side.
This same type of component in smaller dimensions is also still used in a horizontal package with leads bent down and passing though holes to the solder side.
The latter are becoming more rare since they don't lend themselves well to robot assembly.

Many (not all) will show signs of pregnancy when they fail, bulging unnaturally when compared with others. Now and then, there may be traces of a crystalline deposit around the end where the seal failed from internal pressure.      
 
These will have values listed on them in uFd & VDC and sometimes, a plus/minus number lying about the precision.
Some also have a date code (rarer) that will look like four digits:
 
2403 = 24th week of 2003
 
Most electronics suppliers have a stock of the various values but if they have a date code at all, try to get only those made before 2002 or after 2006. The caps made between those years may be bad when new.

The larger caps will probably be OK since the failure is likely related to functions other than brute-force filtering. A pretty good 'rule of thumb' is to replace any caps you see bulging that are 100 uFd or less. If you don't mind a few nickels more, insist on 'low ESR' capacitors.
If you choose to replace these yourself, you will need a quality soldering iron with a small, preferably iron-plated tip, rosin core solder and a sponge which when wetted is used to frequently wipe oxidized solder from the tip this should be kept bright and clean and fresh tinning will keep it that way.
You should also buy some solder 'wick' with the iron; this is used to place on the solder you wish to remove and then heated with the iron. Properly used. the wick will absorb nearly all of the solder from the lands from which you wish to remove a component.  
A good source for any of these things is http://www.mouser.com/  They have a huge inventory of parts, fair prices and no minimum billing.

Posted on Sep 16, 2008

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