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I really want to know if I can use a 9 volt battery to test three lcd/led backlights at a time.Thanks in advance.

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What is the voltage of the bulbs? 9 volt or 110v ?

Sir Dana

Posted on Apr 28, 2017


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LG 47LN5750 Have audio and have done flashlight test - I can see image with flashlight - no backlights.

Make sure the power supply is being triggered. If there is no LED_On signal it may read that. But if you know the backlight should be in, then check LEDs. Try powering each LED on the strip individually with a battery/resistor. unhook each strip before testing.

Jan 05, 2018 | LG Televison & Video

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Hi i have a Vizio E470-A0 That wont turn on. I press the power button and it turns on for a second then fades or just cuts off.

Does your 12 volt remain at 12 after it shuts off or does it drop to 0?..This model was known for issues with the LED lamps themselves but Ive seen a number of sets where the LED's were fine and it was the power supply or main boards bad

Oct 16, 2017 | Vizio Televison & Video

1 Answer

Can you use one 9 volt battery to test 3 lcd/led backlights at a time,instead of two double A batteries?

Two AA batteries are 3 volts (1.5v per battery). A 9 v battery is 9 volts. You are going to burn out your LED lights.

Semper Fi,

Apr 27, 2017 | Computers & Internet

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I have an LG 47LN522-UB LED TV that stopped working after three years and need help diagnosing a problem with it.

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.

Apr 26, 2017 | LG Televison & Video

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Hisense 50h5g model the backlights are blinking the pictures is really dark but sound quality is still good what may be the issue

Perhaps the backlight LED driver board needs to re-seated.
Also check flex wire connectors for loose connection.
reseat or replace

Aug 16, 2016 | Hisense Televison & Video

1 Answer

LED TV - replaced power board but still no backlight? LED backlights do not seem to work.

yes the led backlight for whatever reason is not functioning and that is the root cause of your problem. Unfortunately to find a replacement led backlight is tough as the backlight is normally fixed with the lcd panel and has to match the voltage and all that stuff with motherboard. and if that doesn't match you might short the tv itself. this case is as good as getting a replacement lcd panel.

Feb 17, 2016 | Seiki SE50FY10 50-Inch 1080p 60Hz LED HDTV...

1 Answer

Why is my replaced lcd screen not lighting up?

1) Wrong LCD screen

2) Video Cable (LCD Cable) is not connected tightly.
Motherboard side, or LCD screen side; or both.

3) IF, a screen Inverter is used, the small cable from the Video Cable, that connects to the screen Inverter; is not connected, or has a loose connection to it. (screen Inverter)

4) An LCD screen, and a screen Inverter are a Matched unit.
If it's the wrong LCD screen......................?

5) IF, a screen Inverter is used; the diagnosis was wrong, and the LCD screen was replaced.
90 PERCENT of the time, the fault is a bad screen Inverter.

A) Laptop's LCD screen uses a CCFL, (Or more than one), for a Backlight; the laptop uses a screen Inverter.

Diagnostic flowchart leads from Graphics Chipset, to Video Cable, to screen Inverter, THEN, LCD screen.
Expensive LCD screen was replaced, instead of the actual part that needed replacing;
Video Cable: $9 to $22
Screen Inverter: $9 to $22

LCD screen: $60 to $245

B) Laptop's LCD screen uses LED backlighting, and does NOT use a screen Inverter:

Diagnostic flowchart is;
A) Video Cable;
A Video Cable should have it's connections PHYSICALLY checked.
You have to try to push the connectors in tighter.
Visual inspection alone will NOT do.

Making sure the Video Cable connections are tight, and this does not fix the problem, then the Video Cable needs to be removed; and every wire in the Video Cable checked for Continuity with a multimeter set to OHM's. (1K)

Not feasible, then take the Video Cable down to the nearest small computer shop; and have the resident tech check it for Continuity.
Should only be a few bucks.

Or just replace the Video Cable.
(Parts changing I know, but...........?)

An LCD screen cannot produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight can be a CCFL, (Or more than one), or a series of LED's.
(Light Emitting Diode)

A CCFL is a Cold Cathode Fluorescent Lamp. (Bulb)
Similar to Fluorescent lighting used in homes, and businesses; but on a MUCH smaller scale.

Average thickness is 2mm. That is a little large than 1/16th of an Inch.
Average thickness is almost as long, as the LCD screen is in height.
View the last 8 photos,

A screen Inverter is used to convert the power, (Electricity), from the laptop; for the LCD screen, and Backlight.

As previously stated, Backlighting that uses CCFL, uses a screen Inverter.
LED backlighting MAY, or MAY NOT use a screen Inverter.
When the LED backlight technology first came out, it seems some did use a screen Inverter.
It also seems as the technology advanced, LED backlighting does Not use a screen Inverter.


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Saab 9 3, 2003. Battery acid covering post

Most likely not a battery problem. Since the battery is fairly new, a good charge should restore it. As far as the corrosion, A thorough cleaning of the battery cables should suffice and replacement shouldn't be necessary.

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Acer AL1916W 19" LCD Monitor '' no power''

I'm having the same problem and it turns out to be the main board.This Service guide is for Version 1.0 but turned out to be helpful

Feb 28, 2008 | Acer AL1916W 19" LCD Monitor

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