Question about Samsung LW20M21C 20 in. LCD Television
SOURCE: Samsung TV Power Supply Board
I doubt that moisture damaged the SMPS bd.
There are many circuit boards in your set and it will take a trained samsung tech to find the problem.
Posted on Jul 17, 2009
Please see here:
You have verify the LCD panel.
Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors pictures: 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.
Posted on Jun 01, 2011
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High voltage shutdown. The high voltage has exceeded 33k
and the unit goes immediately into safety shutdown. Check power supply
regulation and horizontal circuits.
Open the TV, and locate the power regulator section. Usually most Sony sets uses STR regulated type power supply in this stage. If any component related to this STR got faulty, this type of fault occurs. Mostly it may be due to a loose soldering and so on. The STR will heat up, and repeated heating and colling can make tis leg soldering to get loose contacted.
You just updie down the regulated section, and look for any loose sodering or bad soldering in that section. Loose soderings are very difficult to locate, as they may be microscopic in size. So I advice you to resolder most of the soldering points on that section, by applying a little more solder. Be sure not to make any soldering bridge shorts, when resoldering. Chek it out. In most cases this will solve the problem.
If not, replace thetow or three small electrolytic capacitors there, and recheck. When replacing electrolytic capacitors, make sure of its polarity, as they have both positive and negative legs, marked both on the body of the capacitor and on the printed circuit board. Make sure not to reverse the side, otherwise it will burst out when you switch on the Tv.
Do these and see the effect. If you need furthermore assistance, feel free to get me through fixya. OK.
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