Hi...please help me. My samsung 21" tv got no picture and sound at all, even standby LED also not light on...I already do some troubleshooting and found that power supply for the biggest capasitor got 350v...also at horizontal transistor B+ got 158v (is that too big supply for horizontal B+..?)....
and another thing got a strange sound came out from flyback transformer..it sounds like "tick..tick..tick.....frequently" .....then, i check where the 158v came from and found it was came from 1 diode that link to horizontal B+....before diode got about 100v and after diode got 158v that link direcyly to horizontal B+. So, what in the world happened to my tv? what should i check and do?
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Re: No power even standby LED..
This is like a car running without a driver,the horizonatl output transistor has the voltage it needs but it does not have horizontal drive signal applied to the base of the horizonatl driver transistor,the driver transistor should have a signal coming from the signal processor where the signal is generated just to get give it to the driver this driver then it gives it to the output to energize the flyback and light up the picture tube and generate a few other supplies,158 volts are there because the output is not turn on,try measuring voltage somewere else in the set and not at the collector of the output,there is a b+supply that goes to the signal processor(8 to 12 volts),check to see if you have this voltage,I couldn't tell you the pins in the siganl processor IC without squematic,It seems you know your way around tv service but be careful when checking voltages.Let Us know if you need more information.
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have a close look at your LVDS cable and screen ribbons for signs of failure or heat damage, and you could try to pull a picture from an AV output in various formats to see if it's the screen itself is failing in some way,
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You have to check the power supply of the tv. It has two sections the standby power and the main power. As from your description the standby power side is ok . what you have to check is the main power section. here i have added a video which will help you understand how to proceed the reaping process. http://electro-medical.blogspot.com/
Those blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://homenol.blogspot.com/ http://electronicshelponline.blogspot.com/
If blinks continue without any pause, the main board is faulty.
These blinks (flashes) are fault indication. By the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit stage inside the TV. Count the blinks occur at one time switch ON, carefully. Do it once again, and make sure about the number of blinks. If the flashes are continious, non-stop, the main system control IC should be suspected. If you wish to get more details, check the site linked here. It has blinking codes detail to many brand TVs. Pull up older posts. Check the site in 'Mosaic' view. It will make search easy. http://electronicshelponline.blogspot.com/
hi; when your LCD TV wont start , even if you press the power button ,
it has a power supply failure, maybe some capacitor has bloated or changed value,
try to watch this http://www.youtube.com
if you know how to solder, or even disassemble the back of LCD TV.
if not try to call a repair technician.
thanks ,, hope this help........