20 Most Recent HP LC4776N 47 in. LCD HDTV Questions & Answers

It is possible that the replacement t-con board is defective

HP LC4776N 47... | Answered on Oct 15, 2015

Hi Neil
Assuming the power supply is in good order!
I am not familiar with your particular model!
The power supply is either shutting down from too much current draw or it's sensing a fault.
Can the power supply be isolated? Does it work without a load?
This will depend on your connection points.

Power supplies them selves are the cause of most failures in modern TV's as they handle the AC & the load & the temperature etc. Check for puffer up Electrolytic capacitors on the power supply board. Caution... you can get a nasty kick of the AC side.

An Example
How to Replace an Electrolytic Capacitor

HP LC4776N 47... | Answered on Oct 15, 2015

go to menu then go to display option then check out the caption option..

HP LC4776N 47... | Answered on May 22, 2011

hello,,,open the back cover of your tv check the power supply section .to identify the power supply section ,it is the pcboard where the ac main supply is connected..there is a connector there that is connected to tha cpu board....resolder the terminal of the connector and tighten the connectors same to the other end..2nd the supply of the inverter board..resolder the terminals and tighten the connectors...the inverter board is the board where the backlights are connected .power supply of the backlights...be carefull it is a high voltage section..its input voltage is from 12vdc - 24 vdc.output is 300 up vac...back light is the bulbs that illuminates the screen of the tv...when it is busted your screen will appear black..

good luck hope this helps you...

please rate my help tnx.

HP LC4776N 47... | Answered on May 29, 2010

need to reconnect T comb board

HP LC4776N 47... | Answered on May 08, 2010

Your antena port could be faulty if its on the main board then your main board is faulty

HP LC4776N 47... | Answered on Feb 26, 2010

All HP iq77x all-in-one PCs suffer from the same problem of a faulty motherboard. This is primarily a soldering issue on the graphics chip,which develops cracks in the solder balls. The PCs contained a separate graphics card, which goes faulty first. This can be removed and the display connector can be moved on the motherboard to use the on-board graphics. This will eventually show the same issue. A short term fix was to heat the graphics chip with a hot air gun or other means (plenty of suggestions can be found on-line) which sometimes works for a few weeks at most. The only 'permanent' fix is to have the chip professionally removed and re-soldered; an expensive option.
If you are lucky, your PC is still wired to use the add-on graphics card, in which case you might be able to remove this and rewire for the motherboard graphics.

HP Televison &... | Answered on Mar 21, 2019

look on your f buttons f5 on mine

HP Televison &... | Answered on Mar 21, 2019

Sounds like The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; [Exclude the model number], in the "Search box at the top right of the display window of the Homepage" to get gathered related posts. See the site by a desktop. Mobile view has no search box. If you are viewing it by your mobile, see it in webview./

HP Televison &... | Answered on Nov 08, 2018

The first thing to do is go into the device manager and delete the drivers for the display and let windows reinstall them. It may be a bad or out of date driver. So when you restart the computer it will put the driver back. Since you did not post the operating system, there is not a lot more I can tell you. If this does not help, you can try an external monitor to see if the problem is present there. If it is then it may be a display chipset issue.

HP Televison &... | Answered on Jul 15, 2018

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