My TV Samsung does not power on but the standby light is on,As in it was freeze.I've checked the power supply circuit
but I can't see anything defective.Is it the regulator that cause the freeze?I'm also a technician.
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Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main digital board./
Hi It is probably a power supply problem associated with standby circuit. If this circuit is bad the set hardly comes on and fails. This is a task for a technician to trace the fault through the whole power supply.
blinks - B+ over current protection (OCP), unit goes to the standby mode then
displays the 2 blink fault. Could be a short in the power supply of any of the
circuits. Check this link to get more details about Sony Blinking codes.
Whenever a television starts doing this the motherboard/main board and or power supply is usually at fault. The power supply can usually be rebuilt for around $150 depending upon the knowledge and skill of your local television repair shop. To replace the parts is usally more expensive then it would be to purchase another television ($300 and up). Are you sure this is the model number of your television because this model number is not for a CRT television. For troubleshooting you can unplug it overnight to try and power cycle it but it sounds like your problem is beyond doing any type of power cycle to get the television back going again. It would need the repair shop or to be discarded for another.
HI, By three blink it means the B+ over voltage protection (OVP), unit goes to the standby mode then displays the 3 blink fault. This is because there is problem in the power supply circuit. Check for any dry soldering in the power supply side. If the tv is working properly for 20 minutes then its sure that there is some dry soldering joints in the power supply side. You have to resolder suspected soldering contacts using soldering ion and solder. The dry soldering joints will look like on in the picture.
There is some short circuit in the secondary side of the switched mode power supply section inside the circuit board. Now only the 5VDC is correct, as you see the standby light ON. The short is likely to the horizontal output transtor. Replace it first and see whether it helps you. If not line out put transformer is faulty, and should be replaced with same type and number..If any internal short occurs, the power supply protection system will activate, and shut down all other secondary power supply rails, as a protection to prevent further damage to more components, This is happening in your TV now. OK
Hi to all,Has anybody experienced these problem.Hope your
solution soon.Thank you.
samsung TV went off but when turned on again power LED flikers on and off but no image
power supply filter capacitor may be faulty