Question about Olevia LT37HVS 37 in. LCD HDTV

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Backlight Inverter Input Voltage

What should the input voltage be at? Right now with the backlights flickering I have constant 21.4VDC, is that enough or is that low? If the problem is in the backlight inverters do you replace the master or slave or both or how do you know? Any insight would be helpful.

Thanks Aaron

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Input voltage like 21.4dc is correct and not sure about master or slave inverter board. You have to check one by one. Here is part store offers cheap prices for boards, please ask required boards.

Posted on Sep 06, 2008

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Viewpia lcd tv backlight not working


Measure the input voltage to back light inverter board, from the main power regulator board. If it is found OK, replace back light inverter board.

Jul 27, 2012 | Flat Panel Televisions

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Got sound but no picture on my tv.


Hi.

First check if you have on screen menu and if the problem is still there if you change input source and cables.

If TV has no backlight on all inputs, then it is either inverter not supplying power to the backlight system, or the LCD panel itself. The inverter or the parts connected to the inverter are common cause for the problem. The LCD panel is not a common fault. When problem is the panel the TV is not worth repairing.

When there is an inverter problem the fault is not necessarily the inverter. The technician needs to test the parts to find out what part is responsible. Testing is done tracking voltage from PSU to inverter. Voltage to inverter is usually supplied by the higher VDC line from PSU. Here broad description of how to test the three parts: Before proceeding...

Here replacement parts for most flat panel TV models:ShopJimmy.

See also:
PartStore

Regards.

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Hey Guru- got a question about a Sanyo DP37647. The backlight flickers 1 time when I turn it on and then goes to black, with no backlight. I do get audio. if I turn it off and on a few times, i can get a...


You are right ,the problem is in the backlight. There's a loose connection in the connector of the backlight to inverter or driver.The backlight have high voltage supply,so if the coonector is mildly loosen,it may cause of voltage drop produce and spark and over heat the connector,and totally result of loose connection.So the things you can do to fix the problem ischeck the connection of the backlight.Open the back cover and look the board,located at the center part.It has a metal cover in the board,remove the cover and check the connector of the backlight,Resolder and tightly press the connector to the inverter or driver.It is usually happen to the backlight of the LCD TV.Just fix the connection of the backlight.Try my suggestion and procedure,.Hope it will help you..Thanks..

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1 Answer

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Hi.

Problem is inverter, backlight or PSU. The backlight lamps that illuminate the LCD display are flashing. This creates the "kind of strobe" effect that you see. There are several possible causes for the problem.

The lamps themselves are defective. The lamps do not fire up completely and keep flashing. The lamps are not sold alone but they are part of the LCD display. If the lamps are gone the TV is not worth repairing.

The inverter is the high voltage board that supplies the backlight lamps. If the inverter is defective it can still be replaced. Testing is done reading DC in, checking high voltage out, and using an oscillator to test the phase of the AC out signal generated by the inverter oscillator section.

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1 Answer

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Either the backlight inverter or mainboard not relaying the 5v supply to the inverter to tell it to "come on." I would check input voltage for the ps_on to the inverter and make sure it's not the main board.


If this has helped please rate!

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1 Answer

The picture on my 32" Acer TV turns off after c 5


could be a problem in the inverter board and the backlight lamp of the monitor .
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The inverter board is a high voltage board the power input of this board is 24volts DC and the output is 200volts AC.The terminal input of this board or connectors must be check because of high voltage Corrosion and loose connections always happen that leads to the mal function of the display or screen failure just like what happen to your TV.
Backlight lamp is installed at the top and bottom of the screen you need to open the back cover of your TV to check up the lamp.(make sure to unplug the TV before proceeding)

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1 Answer

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Hi, please chech does the screen of your TV lights up?during power on?if not then there might be a problem on the inverter board and the backlight lamp of the monitor .The lamp is a cold cathode bulb it requires a high voltage supply from the inverter board in order to light up.just like any other bulb this lamp has a limited life span more or less 2 years of continues lit.The inverter board is a high voltage board the power input of this board is 24volts DC and the output is 200volts AC.The terminal input of this board or connectors must be check because of high voltage corrosion and loose connections always happen that leads to the mal function of the display or screen failure just like what happen to your TV.
Backlight lamp is installed at the top and bottom of the screen you need to open the back cover of your TV to check up the lamp.(make sure to unplug the TV before proceeding)..check first the test point that I mentioned then post back for your findings then will proceed to further trouble shooting.
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2 Answers

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This is a common problem on these plasma TV's. The problem resides in the high voltage boards known as the X and Y Sustain boards.. You can purchase them here for a very reasonable price:
http://www.discount-merchant.com/Y-SUSTAIN-FOR-42-PLASMA-TV-PN-6871QYH036A-p/sku9510.htm

The above link is to a Y-SUS board. The X-Sus board is often the 2nd cause of failure and can be found here:
http://www.discount-merchant.com/X-SUSTAIN-6871QZH041B-6870QZE017D-6871QZH052D-p/sku9509.htm

To test which board is failing, you need to check voltage input to the YSUS board first... Input should be 120V from Power supply, output should be above 250V.. Do this test with XSUS disconnected. IF 250+V exists, then XSUS is damaged. If not, then the YSUS is the faulty part.

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1 Answer

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Click here to find the backlight inverter board.
Let me know if you need further assistance. I repair power supplies for all LCD models.

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