Question about Proscan 40LC45S 40 in. LCD TV

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What would cause a Proscan 40LC45S 40 in. LCD TV to have sound bt no picture?

Proscan 40LC45S 40 in. LCD TV Hello, I have a proscan 40lc45s that has sound but no picture (black screen). Does anyone have any ideas? I have checked for the obvious blown caps and saw nothing.

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The chroma ic could be shorting

Posted on Jun 08, 2014


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SOURCE: who makes the proscan 40lc45s tv?

Posted on Jun 09, 2009

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SOURCE: Proscan 40' 40LC45S has a high pitched hum when it

Same problem here, there is a high-pitched sound in standby. As soon as the light turns blue and the TV is on it's gone. I actually exchanged this TV three times at Best Buy but all the models made the same buzz in standby. I was told that it's normal and in the store you can't hear it since there is too much humming from other TVs around. The power is transformed down to a minimum, just for the remote controls, internal clock etc. and this causes the buzz, like when you dim your lights at home. I hooked it up to a surge-protector for clean power and just switch it off over night. During the day it's hard to hear anyway. - Again, since this is my third (!) Proscan 40' exchange I can definitely say that this is normal for this model. I was just surprised that nobody mentioned the same problem so far on the Best Buy reviews.

Posted on Jun 11, 2009

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Have you tried,
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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.

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Do you have sound? If you have sound and no picture most likely you are dealing with either a back light fault or power supply problem. Dim the lights in the room, take a bright flash light and shine it on the screen with the set on. If you see a faint picture, it's back light/power supply related. If I have been of assistance to you please sign my gues book

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Try changing the input device to something you are sure, works such as a DVD player. Switch off TV manually, switch off power, remove plug and retry after 48 hours. If problem persists, please refer it to a qualified service technician.

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