Question about Samsung LN40B500 40 40" HDTV LCD TV

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No hv on inverter board bn44-00264a - Samsung LN40B500 40 40" HDTV LCD TV

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Check to make sure you have 24vdc input

Posted on Oct 25, 2012


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My screen only flashes the akai startup screen and then goes black again

Could be several things,

you could have a faulty inverter, bad CCFL back lamp, faulty 24vdc circuit, or a HV short to ground @ inverter output

Nov 12, 2012 | Akai Televison & Video

1 Answer

I have a panasonic microwave with convection oven, grill and steamer. When I switch on the microwave, the house fuse (16 amp) cuts out. With the other functions of the oven, it works fine. Do I need a new...

you have a short circuit.
test the a) HV rectifier b) Capacitor HV c) HV transformer d) Magnetron e) test the swich for door for short.f) circuit board main is short.
see the diagrams and proceed.


Oct 01, 2012 | Panasonic NN-C994S Convection/Microwave...

1 Answer

I hv got LCD TV hv No picture but have very good sound. While power put on ,it flash & go. What to do? This is for BenQ LCD TV 2680.Back light inverter is avllable? in case needed.

As you thinks mey correct to an extent. If backlight inverter board has some kind of short with its components, the fault you describes here will occur to LCD TVs, irrespective of Brand and Model. Most of the backlight inverters for any models are available at open electronic spare part shops at your town. Just take the backlight inverter board out from your Tv. It will have a special number printed on it, and should be noted when buying a new one. Remember its connections when you take the boaed out from your set. If needy, mark the positions of connecting wires to that borad on a piece of paper, for reference.
Replace the backlight inverter first. It must solve the problem of your BenQ LCD Tv. OK.

Oct 07, 2011 | Computers & Internet

1 Answer

My viore lcd is not turning on but the power light is on

HV inverter board defective. try replace the board, and check the lamps voltage

Nov 06, 2010 | Televison & Video

3 Answers

Bravia kdl-40s4100 has no sound, no picture. Checked the line fuse to the HV power supply and it checked good. PS problem? Where can I find a replacement circuit board or would I be better off replacing...

The 2 long boards call the LCD inverter boards are dead.These 2 long LCD inverter boards are dead,must be replaced.These 2 long LCD inverter boards help the LCD screen to have a backlight to have a picture.Tries websites like, to buy those 2 long LCD inverter boards for the replacement.

Jul 14, 2010 | Sony Bravia KDL-40S4100 40 in. LCD TV

1 Answer

No sound screen blank

This one is known to have bad backlight inverter board, mostly due to open winding on the secondary side of the inverter transformer,
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:


Transfomer and board:

Jul 01, 2010 | Olevia LT32HVM 32 in. LCD Television

1 Answer

The Model 700 has sound but no picture when different inputs are used.

Ur LCD inverter backlight board is dead.Replaced this LCD inverter backlight board.Will get ur picture back.Tries websites, to buy a rfurbish LCD inverter backlight board.

Mar 10, 2010 | Proview HV-177 17 in. HD-Ready LCD...

1 Answer

When i turn on my monitor blue light comes on and immediately goes to yellow in standby.

these a crt internal hv board defective. or lcd monitor is a psu /inverter board defective.

Dec 20, 2009 | Computers & Internet

1 Answer

Inverter problem , prefer to repair the board not buy new parts

repairing lcd inverter is like repairing a hv circuit used for strobe lights. try to check first all electrolytic capacitors, then loose board solder, also occularly check both ccfl bulbs for breakage and burnt marks.. best is if you can download schematic diagram for it so that you may check also all semiconductors on the board.

May 01, 2008 | LG Flatron L1710S 17" LCD Monitor

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