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I have an LG LED TV 55LB5900-UV which has its backlights flashing off and on at say a 1 hertz rate.

I'm an engineer and have measured the voltages from the PS board to the LEDs and have swapped the PS board with another and got the same results. I now have the TV full apart and see that most of the LEDs turn on, but not all of them. The LEDs that do not light are scattered amongst working ones. I do not see a series of LEDs in a line out. Is the failure mode such that the LEDs work reasonably well until too many fail and then the remaining start flashing? Or is it some other control that has failed? Regards, Richard

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE:

Hi there,
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Posted on Jan 02, 2017

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  • 4234 Answers

SOURCE: display Backlight failure - Philips MC235

Most likely there is a bad connection either at the display itself or in the power supply. If you are comfortable working with this equipment and can solder, try resoldering the pins for the display itself first.

Keep us posted.
Dan

Posted on May 28, 2008

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MrScary66613
  • 1990 Answers

SOURCE: inoperative LCD TV

Welcome to Fixya! My Name is Travis! I have heard this Problem Before on Another Model. Turns out it was the Power Switch in that case. Yours has the Exact same Symptoms. Get that Checked and let me Know so we can go Further or if that is it.

Posted on Jan 02, 2009

heatman101
  • 43501 Answers

SOURCE: IM350 when battery inserted flashes green then

Hi,

Check the battery contacts in the gun...

Here is a tip that I wrote about the Paslode nailers and the problems that can come up with them.

I also have a link to the Paslode manuals which contain Paslode cleaning and troubleshooting guides.

If you need parts for your Paslode, there also is a link for a site that sells the Paslode nailer parts.

Paslode Cordless Nailer Problems



heatman101


Posted on Mar 06, 2011

  • 6771 Answers

SOURCE: If a warning light indicates the CPU is not functioning, does that mean I have to get a new processor?

Yes! judging by all the cascade break downs, I would suggest replacing the motherboard, HP has a history with motherboard issues.

Posted on Mar 29, 2012

Testimonial: "devastating but useful"

SOURCE: Viizio VT420M has scrambled Display, Sound, Backlight and PS outputs are all there

I would suspect the main board as well

Posted on Oct 03, 2012

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