Question about Olevia LT37HVS 37 in. LCD HDTV

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237v Power Supply Output

What should the output voltage from the power supply that feeds the backlight inverters be?

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Posted on Sep 21, 2008

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1 Answer

The picture went "dark" but


Hi,

This is an indication that the backlight of your unit is not working properly. This is caused by faulty either in the power supply board or the inverter board. You have to check the output voltage of the power supply board feeding the inverter board, if present replaced the inverter board. If not, check the power supply board for leaky electrolytic capacitor or replaced the entire power supply board.


Hope I helped you.
Have a nice day!
Thanks for using fixya.

Sep 04, 2011 | Toshiba 14VL44G 14 in EDTVReady LCD TV

1 Answer

My TV has sound but the screen is blank, can you help?


Hi pine2349,

This kind of symptoms is an indication that the backlight of your unit is not working.

You have to check the output voltage of the power supply feeding the inverter board. If it is present, you have to replace the inverter board, if not, the power supply is faulty.

Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Aug 26, 2011 | Protron PLTV-37 37 in. LCD Television

1 Answer

The screen went black


Hi elav2,
Power on the unit in the dark room then shine with the flashlight directly inthe screen, you will barely see the images. This is because your backlight isnot functioning. The following reason is the caused.
1. Power supply - missingB+(supply voltage) coming from this board feeding the inverter board. This iscaused by faulty transistor, dried/leaky electrolytic capacitor, open fusibleresistor.
2. Inverter board - eventhe B+ is good from the power supply, if the fuse, driver transistors/IC's, high voltage transformer is faulty no output to the backlight resulting to black picture.
3. Busted backlight - eveninverter board is good but if this is busted resulting to black picture also.
Diagnosing the fault is technical and if you don't have necessary tools and test instrument and can't fix it yourself, I wouldadvice you to look for an experiencedtechnician to isolate theproblem.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Aug 05, 2011 | Vizio 42 in. LCD TV

1 Answer

My proview 3200 has picture but no sound


Hi gravdar4,
Power on the unit in the dark room then aim the flashlight directly to the screen, you will barely see the images. This is because your backlight is not functioning. The following reasons are the caused.
1. Power supply- missing B+(supply voltage) coming from this board feeding the inverter board. This was caused by faulty transistor, dried/leaky electrolytic capacitor, open fusible resistor.
2. Inverter board- even the B+ was present from the power supply, if the fuse, driver transistor, driver transformer was faulty, no output to the backlight resulting to black picture.
3. Busted backlight
Diagnosing the fault istechnicaland if you don't have necessarytools and test instrumentand can't fix it yourself, I would advice you to look for anexperienced technicianto isolate the problem.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.


Jun 12, 2011 | Proview PA-32JK1A 32 in. LCD Television

2 Answers

Tv has black screen, no picture


Good day!

Please before we go to the further troubleshooting please to play a DVD or recorded shows to determine if the problem is in your TV or cable connections.

If the problem persist please try to replaced this simple procedure on how to fix that problem.

  1. Remove the back cover of your TV.
  2. Check the 24vdc from the power supply going to inverter board using multimeter tester (range on DC)
  3. If you have 24vdc on the input voltage of inverter board,try to check the output voltage of that board,it should have 500vdc going to the cathode light inside of TV (back light)
  4. If you don't have the 24vdc on the inverter it means your power supply got trouble.
  5. You have better chances if you have failing capacitors on the power supply.Just look the image of capacitor if it is leak/bulged on the top.
If the problem is still there and you have other question just add a comment

I hope this solution will be helpful.Thank you for using FixYa.

May 31, 2011 | Akai LCT2715 27 in. LCD Television

1 Answer

My grundig lenaro has sound but no picture


Hi Mike,
Power on the unit in the dark room then shine with the flashlight directly in the screen, you will barely see the images. This is because your backlight is not functioning. The following reason is the caused.
1. Power supply - missing B+(supply voltage) coming from this board feeding the inverter board. This is caused by faulty transistor, dried/leaky electrolytic capacitor, open fusible resistor.
2. Inverter board - even the B+ is good from the power supply, if the fuse, driver transistor, driver transformer is faulty no output to the backlight resulting to black picture.
3. Busted backlight - even inverter board is good but if this is busted resulting to black picture also.
Diagnosing the fault is technical and if you don't have necessary tools and test instrument and can't fix it yourself, I would advice you to look for an experienced technician to isolate the problem.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Apr 06, 2011 | Grundig GU19WDT 19 in. LCD TV

2 Answers

When I turn my TV on there is sound, but, the picture vanishes after a couple of seconds. Why?


The backlight inverter is what powers the screen to "light up." You will need to check your power supply for the proper voltages going to the backlight inverter. If those all check out ok, then you need to replace your inverter to get your image back. You can find a new inverter by searching "inverter + model number of your tv.



Please rate if this helped :)

Apr 04, 2011 | LG Televison & Video

1 Answer

HIT REMOTE TO ON POSITION GET NO PICTURE BUT VOLUME GOES ON


Hi rallyred71,
Power on the unit in the dark room then shine with the flashlight directly in the screen, you will barely see the images. This is because your backlight is not functioning. The following reason is the caused.
1. Power supply - missing B+(supply voltage) coming from this board feeding the inverter board. This is caused by faulty transistor, dried/leaky electrolytic capacitor, open fusible resistor.
2. Inverter board - even the B+ is good from the power supply, if the fuse, driver transistor, driver transformer is faulty no output to the backlight resulting to black picture.
3. Busted backlight - even inverter board is good but if this is busted resulting to black picture also.
Diagnosing the fault is technical and if you don't have necessary tools and test instrument and can't fix it yourself, I would advice you to look for an experienced technician to isolate the problem.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Mar 24, 2011 | Televison & Video

1 Answer

I have sound but no picture on an Olevia 237V


If you get no picture on all inputs (TV, DVD, ETC.) then the problem can be in the backlight inverter board or the power supply that supplys the power to the inverter board.

Nov 01, 2009 | Olevia 237T 37 in. LCD TV

1 Answer

Olevia 237V Backlight problems


Check inverter supply voltage, (should be constant and stable) if found ok, then inverter or back-light tubes are suspected.

Sep 06, 2008 | Olevia LT37HVS 37 in. LCD HDTV

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