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Toshiba 32HL57 32'' lcd

Sound, but black screen on all inputs, incl. cable....
sounds like backlight/ inverter problem according to blogs/posts...
how do i get parts and replace myself?

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Hello. You could be right in a way, but the larger tv's have more of a complex inverter. The way you can try to fix it yourself if you know what your doing, would be to download a manual for it. Google the model number along with download schematic. try this website to see if your schematic is available for free. If not, then you can call toshiba and find out where to get one. After you receive it, then go through the troubleshooting steps to trace down the problem. If it turns out that it say is a defective power supply module or video module, you can google the module number and some times you can find them used. if not, you have to go directly to toshiba. Good luck ! Ron

Posted on Sep 09, 2009


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Rca tv powers up has backlight no sound or picture replaced main board and inverter

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Toshiba satellite M305 S4907 comes on but monitor is blacked out can barley see

The Toshiba Satellite M305-S4907 Notebook PC, uses a single CCFL for a Backlight.

Primer before we go on;

An LCD screen cannot produce light. It needs an additional light source,

Click on the monitor image.

The additional light source is a Backlight.
A Backlight can be a CCFL, (Or two of them), or a series of LED's.
(Light Emitting Diode)

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

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Average length is almost as long, as the LCD screen is in height.

View the last 8 photos.

A screen Inverter is used on laptops that use CCFL for Backlighting.
A screen Inverter converts the power (Electricity), from the laptop, for the LCD screen, and Backlight.

Laptops that use a series of LED's for backlighting, do Not use a screen Inverter.

90 PERCENT OF THE TIME the fault can be attributed to a bad screen Inverter.,Satellite,M305-S4907,PSMD8U-02R015B,Laptop,Inverters.aspx

The plastic thin frame in front of the LCD screen, is the Display Bezel. (Toshiba = LCD Bezel)
The screen Inverter is located behind the Display Bezel, and mounted at the bottom of the LCD screen.
(LCD Screen Frame, actually)

Easy to get to; easy to replace.

How to test a screen Inverter? Requires a Sensitive multimeter.
Read fairly expensive,

Because of this; and the low cost, plus ease of replacing; most home users just opt to replace it.

Know this;
Fluorescent lamps have MERCURY inside. HIGHLY poisonous.
Now couple that with the long thin makeup of the CCFL, and how easy it is to break it.

This is why if the screen Inverter is found to NOT be the problem; I would suggest replacing the LCD screen itself; instead of trying to replace the CCFL, and cause possible Mercury poisoning.

For additional questions please post in a Comment.


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2 Answers

My toshiba 22cv100u screen is black when I have tv on, i have sound but no picture

your backlight may be out....I working on one with same problem...the transformer on the backlight inverter board went bad, its about 12 dollars on ebay....but in your case, would require some troubleshooting to determine if you have the same problem. there is an access panel on the back of the tv, under that is 4 connectors, they are high voltage out to the backlight lamps. you would need a volt meter to determine if the lamps are bad or the board

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1 Answer

My toshiba laptop will boot when I power up but the screen stays black

Jeff, connect an external monitor for a diagnostic test.

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The external/VGA monitor can be a CRT type (Looks like a small TV), or a flat LCD screen that has a VGA cable.

Turn the external monitor on. If a CRT type allow it to warm up.
Turn the laptop on.

By default the display should show on the external monitor. If not press, and hold down on the Fn key, and tap the F5 key. (One of the Hot Key's)

If the display still does not show, hold down on the Fn key, and tap the F5 key again.
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1) Internal monitor of laptop ONLY
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If graphics do Not show on the external monitor, you have a problem with the graphics chipset on the motherboard.
(ATI Radeon 3100)

Video Cable
1) Could be the connections. The connection of the video cable TO the motherboard, and the other end of the video cable TO the back of the LCD screen. (In the Display Assembly)

2) Could be damage to the video cable. Check the sheath of the cable for obvious signs of damage. If so, the thin tiny wires inside may be damaged also.

Cable should be checked for continuity of each wire in the cable. (Ohm's with a multimeter)

Video Cable condition, and tightness of connections check out, it's on to the screen Inverter.

An LCD screen does not produce light by itself. It needs an additional light source.
A Backlight is the additional light source.

A Backlight is a CCFL, or a series of LED lights.

The Toshiba Satellite L455D-S5976 Notebook PC, uses 1 single CCFL for a Backlight.
Cold Cathode Fluorescent Lamp.

Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

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

90 PERCENT OF THE TIME the fault is the Inverter.

The screen Inverter is a small rectangular circuit board, and is located behind the Display Bezel, an at the bottom of the LCD screen,

Example of screen Inverter,

Link to a free Service Manual for the Toshiba Satellite L455D series of Notebook PC's,

Under the main Toshiba heading go down to the subheading -
Satellite A10. (A10 is in blue)
In this 'paragraph' go down to the third line, and scroll across to -
L450D, in blue.
Click on L450D.

This is a PDF file. The computer you are using now has Adobe Reader on it, which uses PDF files.
After you click on the file name { L450D } it may take up to 30 seconds before the first page comes up.

Would appreciate it if you would post back in a Comment with your findings.

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2 Answers

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HelloCheck the backlight inverter board. If it has damged, most common fault to LCD TVs, there will be no backlight to the LCD screen, and will look black. Your tV has sound output without picture. This means that all other boards ar functioning well. Check the backlight inverter section and CCFL tubes used in backlight assembly. OK.

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Check to see that the input set for the tv is correct. If you have sound you may have the backlight out probably due to a bad inverter board. If you are unsure of the input or the cable box operation ,hook the tv directly to the cable jack for a test.

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