Question about Ps Televison & Video
I have exactly the same problem, my unit has been sent to the service centre 3 times already and they still haven't fixed it. It appears to be a main board issue. I will send it back again for servicing and will NOT take it back unless the main board is replaced.
Posted on Aug 09, 2007
if this is a desktop: Did you check the power supply? try to replace it with a new one
Laptop: Try to run the machine without the battery plugged in....straight with the adapter....If the laptop still restarts...it's a manufacturing defect which should be replaced by the OEM.
Posted on Jan 18, 2008
You don't need to take it all apart to get at the heat sink.
Take the strip off under the display (slides too the left to unlock) remove the keyboard. You will see a metal plate that covers the fan. (the fan is fixed too this plate. Remove the plate and the heat sink is underneath. You will probably find the fins are packed with lint. If you take the heat sink out be careful of the display cable that is bent around it and regrease the cpu when you replace it.
Posted on Feb 05, 2008
The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.
The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board. You might be lucky it's just a blow fuse. Also a defective transformer can cause your TV not to power on.
All these can be checked on the power supply board.
But more often bad capacitors causes problem on the power supply board. I do not think the power board needs replacement, rather those defective capacitors is 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. Or you can by a refurbished complete power board to save you some stress.
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 05, 2012
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