Question about HP LC3040N 30 in. HD-Ready LCD Television

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HP LC3040N I have sound but no image

Our HP has sound when i power it on but no image. I am very confused as to where I check to see if the light needs to be replaced. Please someon help if you have this similar problem, and please let me know in detail how/ where to fix the problem.


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In my case, the backlight flashed on for less than a second, then went out. Turns out the backlight inverter was bad. I replaced it (got mine at and everything works fine.

Posted on Mar 07, 2008


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HP LC3040N 30 In has no sound coming from it.

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Mar 07, 2017 | HP Computers & Internet

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I have an HP LC3040N /MODEL:HSTND-3L02. The screen is black, and it has sound. The right side of the screen lights up for 3 seconds, then goes black. Is there a replacement light/s for my TV?

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. To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board..

Nov 13, 2016 | HP Televison & Video

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Blinking motherboard led

When the following situations, you need to replace the LCD screen:
No image on the screen, but the power light stays on
Dark display but still readable
Between the screen flashes on and off 1/2 to several seconds
Power light stays on, but no display and sound
No image on the screen, but LCD TV still has sound
Picture cycle on and off, as well as high-power LED lights

May 24, 2013 | Computers & Internet

1 Answer

Hp lc3040n tv screen flaches then goes black. changed inverter and motherboard! no help.

How about the power supply 24vdc output?

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:


Please post back what you find.

Jul 21, 2010 | HP LC3040N 30 in. HD-Ready LCD Television

1 Answer

HP LC3040N Screen

I had the same thing happen, replaced the backlight inverter and it works fine. I got mine from

Feb 14, 2008 | HP LC3040N 30 in. HD-Ready LCD Television

1 Answer

Sound but no picture

I had the same thing happen, replaced the backlight inverter and it works fine. I got mine from

Nov 25, 2007 | HP LC3040N 30 in. HD-Ready LCD Television

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