Question about Proscan 40LD45Q TV

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When i turn proscan tv on it automatically turns off(just turn on for less than secon

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  • johnny Feb 22, 2012

    how change caps filter dc

  • johnny Feb 22, 2012

    i want to change capacitor

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2 Answers

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  • Proscan Master
  • 749 Answers

PROSCAN 40LD45Q is known to fail in several different ways and the momentarily screen blink is one of them.
This particular failure on its own can be caused from two different issues - problem with the backlight circuit alone or problem in the 12/24 V rails of the standard power circuit.
If the TV remains ON (blue LED) then it's likely a backlight issue.
Still on the same board though.

For more details see
http://blog.coppelltvrepair.com/2013/05/repairing-proscan-40ld45q-with-power.html

Hope this helps!

Posted on Jun 12, 2013

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  • Contributor
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OK I Have a 40" Proscan 40LD45Q
had the power problem when you turn it on it would flash and then cut off again.
after checking I found that the transistor on the power board was bad.
Its one of the 2N4401 transistors found on the cold side in between the
cluster of resistors and and mosfet heat sink. kind of hard to get too
but replaced it and tv works great now.. $1.19 at radio shack for the part.
Hope this Helps ..
By Lynn

Posted on Apr 12, 2012

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Posted on Jan 02, 2017

budmrtn
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SOURCE: When I Turn Proscan TV on it automatically turns

You may have power supply DC filter caps problem, that will be the first place to look.
If you are going to DIY and have proper tools and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com

Posted on Jul 03, 2010

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I try to turn my proscan tv on and the the power comes on but before anything the tv blinks a d it turns off immediately, any advice?


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Mar 02, 2013 | Proscan 40LD45Q TV

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When I Turn Proscan TV on it automatically turns off (just turns on for less than a second)?


You may have power supply DC filter caps problem, that will be the first place to look.
If you are going to DIY and have proper tools and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com

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