Question about Coby Televison & Video

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Hi I have a Coby 40 inch LED tv. When I put it on the screen appears for 15 seconds then the screen goes black But I can still her a the voice commentary.

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  • Coby Master
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Fault at its main digital board. Lose of backlight control voltage from it to the back-light inverter board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here.

Posted on Dec 11, 2016

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Posted on Jan 02, 2017

ZaneD
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SOURCE: Sony Bravia 40 inches has a defect

More then likely your power supply failed. If you do not hear a click from the relay during the power up cycle then your power supply failed.

Posted on Aug 08, 2008

SOURCE: Complete black screen on samsung 46 inches

Thats Samsung for you. They are designed to last just right outside the warranty then fail. Typically the LCD panels are bad, and they are the most expensive part on that Korean unit.

Posted on Oct 07, 2008

  • 4234 Answers

SOURCE: streaks and two black circles appeared on my screen

This is a hard one without seeing the actual defect. It sounds like there is a problem with the processing board. It could be as simple as a poor connection inside at a cable connection. The signal levels inside these sets is very low and any dirt or dust in the connection area can cause "noise" on the digital data lines that can show up in odd ways like you described. If the set is no longer under warranty, you can try reseating all of the cables and connectors inside the set. That may resolve the problem.

If not, try to post a picture of the screen here and I'll try to give you more options.

Dan

Posted on Apr 10, 2009

xCAUSALITYx
  • 210 Answers

SOURCE: My SOny Bravia 40 inch LCD TV has a vertical line

Hi,

It could be 1 of 4 things:
1. One of the ribbon cables has worked itself loose (Simple Fix)
2. One of the assembly boards maybe faulty
3. The driver board which feeds the panel maybe faulty
4. The panel is faulty

The driver board in the UK costs approx £70 and approx £35-70 to fit it if this is the fault.

All other parts are between £80-160 and approx £35-70 to fit it if this is the fault.

The panel will cost approx 50-75% of what the TV was worth when you bought it - "Repair versus Replacement"

Thanks

Posted on Oct 01, 2009

  • 610 Answers

SOURCE: samsung 40 inch lcd screen goes black just got

most likely the main board is defective but it could also be the lcd panel itself or the lvds cable.probably will need a service call to determine problem.

Posted on Oct 28, 2009

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