Question about Sylvania Televison & Video
Your unit being stuck in standby mode is an indication that its having a power problem. Remove its plug from the wall and fix it back into the wall, then turn it on again. If its still stuck in standby mode, then the power supply board in the unit is the cause of the problem.
The power supply board might be defective and maybe that's why the unit won't power up. Its receiving power but it cannot transfer the current to the necessary part of the unit because a capacitor, diode, etc may have been faulty. Until these bad components are replaced, the unit might not come on.
This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.
I do not think the defective power board needs replacement, rather some defective capacitors are causing this issue.
Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.
The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)
You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.
What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).
You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors).
After replacing these capacitor(capacitors) most likely the normal operation will be restored.
Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.
If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.
I hope this helps.
Posted on Jan 01, 2011
Have you measured the voltage at the base point of video output transistors at the base card. If not just measure it. It must be between 1.8 --2.8; changes according to video information. Check the collector voltage of the the video output transisotrs, or at the Green, Red and Blue cachode pin connections at the base card. It must be lower than the main input [168VDC]. If it is not so, or equal to that of the supply voltage, and there is no base voltages for the video output transistors, chroma IC is damaged, or it doesn't get proper voltage to function. If these are the conditions said above; there will be no raster and a blank screen will be the result.
Check the +5VDC rail and the other low voltage regulated supply rails 9VDC or 8VDC. If there is no voltage, check the relattive regulator ICs. Do the above said, and check whether it helps you or not. If not inform me through Fixya. I'm ready to assist you. OK.
Posted on Jan 01, 2011
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Posted on Jan 02, 2017
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