LCD TV not turning on

argonrepublic · 02:44 PM

I have a Proscan 32LA25Q LCD that is not powering up. When power switch is press the power indicator turns from orange to blue and 5V and 12V power supply outputs become active. It appears that there is no backlight voltage but I will recheck. I aimed a flashlight at the screen to see if there is any LCD activity but could see none.
I would have expected a click (however there are no relays that I can see) or some kind of audible blip from the speakers but there was none.
My search engine results showed a couple of half sentences from fixya.com in regards to backlight circuit capacitors.

BWRX · 26th April 2011, 06:02 PM

These LCD TVs have lethal voltages on the power supply board, so if you are not experienced with TV repair I would not attempt to fix this yourself. The best thing to start with is the repair or service manual. Like cars, TVs also have service manuals. Sometimes you can find them online for free or for a small fee. This can help you identify where the problem is and even what components may need to be replaced in order to fix it.

argonrepublic · 27th April 2011, 07:00 PM

This particular television uses a Proview power supply which is also used in many other brands. My research led me to replace 2 9N50CF N channel fets and 2 F105J capacitors. TV is now like new.
Thanks for help.

darkmachine · 14th July 2011, 01:35 AM

I have the same power supply but I have not been able to find a place to purchase F105J caps. Where did you source yours?

20th April 2011, 02:43 PM	#1
argonrepublic diyAudio Member Join Date: Apr 2005 Location: Simcoe Ont	LCD TV not turning on I have a Proscan 32LA25Q LCD that is not powering up. When power switch is press the power indicator turns from orange to blue and 5V and 12V power supply outputs become active. It appears that there is no backlight voltage but I will recheck. I aimed a flashlight at the screen to see if there is any LCD activity but could see none. I would have expected a click (however there are no relays that I can see) or some kind of audible blip from the speakers but there was none. My search engine results showed a couple of half sentences from fixya.com in regards to backlight circuit capacitors. Last edited by argonrepublic; 20th April 2011 at 02:44 PM. Reason: spelling error

26th April 2011, 06:02 PM	#2
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	These LCD TVs have lethal voltages on the power supply board, so if you are not experienced with TV repair I would not attempt to fix this yourself. The best thing to start with is the repair or service manual. Like cars, TVs also have service manuals. Sometimes you can find them online for free or for a small fee. This can help you identify where the problem is and even what components may need to be replaced in order to fix it. __________________ Brian

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27th April 2011, 07:00 PM	#3
argonrepublic diyAudio Member Join Date: Apr 2005 Location: Simcoe Ont	This particular television uses a Proview power supply which is also used in many other brands. My research led me to replace 2 9N50CF N channel fets and 2 F105J capacitors. TV is now like new. Thanks for help.

14th July 2011, 01:35 AM	#4
darkmachine diyAudio Member Join Date: Jul 2011	I have the same power supply but I have not been able to find a place to purchase F105J caps. Where did you source yours?

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