Question about Samsung LE32R73BD 32 in. HD-Ready LCD Television

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My samsung le32r73bdx/xeu has sound but only a very low white rastor on the screen. Is this a backlight/inverter problem? the set is about 5 years old. thanks.

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Fran_red09, Pay very close attention to the video clips that you find on YOUTUBE and you may be able to make decision on repair/refurbish or just buy a new unit! If you open your unit and happen to find bad (swollen, leaky) electrolytic filter capacitors on the "switch-mode-power-supply-board" please moke note of brand name printed on the "heat-shrink tubing that covers the now swollen aluminum "can" housing!! Yes, it could be a SMPS/INVERTER problem!! Do your research here at fixya. LCD computer monitors use same basic lcd display technology and mode of operation!!! Only they don't have a tv tuner and lots of input selection capability!!! Report back here if you need some assistance and do a comment and rate this response if you feel it has been of some use to you. Bye for now. 12fixlouie

Posted on Aug 03, 2010


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Sounds like either the backlight or the inverter is going out on the TV. This tends to happen after 4 or 5 years. If there is a TV repair shop in your area they would be able to figure out if the inverter or backlight is the problem and replace it. It may be best to replace the TV itself though because repairs can be costly and something else could wear out after the repair.

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I would like to know what part I need to fix my tv it's a 5 year old Samsung tv it worked just fine one day then the next the screen went black and there's still sound but no picture.

Back - light problem. 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.
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should trouble shoot. Contact any service technician. The circuit will differ with models and versions.

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When the screen flickers on and off it usually comes from the power supply or backlight inverter being bad. For your TV, the backlight inverter and power supply unit are combined. As you can see in the picture attached it's the white part on the right side that has gone bad. You will need to replace that board. LN40B550K1F Samsung LCD TV Repair Guide

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Hi! Welcome to
You most likely have a backlight issue with this TV set. Could be the inverter circuits for the backlights. The inverter is the power supply source for the backlights. there could also be a screen driver problem. This would entail changing the entire board. You should call in an authorized Samsung repair center to check this set out for you.
Hope this resolution fix the problem on your computer. Thanks for contacting Fixya. God bless. Bye for now.

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I have a 37in, the screen keep going blank for a bout 5 seconds and when it comes back on the constrast goes up to 100

This is a combination of the backlight inverter and the mainboard. It is going into fail safe mode when the backlight is failing and resetting to default settings. I believe once you change out the backlight inverter that your problem will be solved. Also, check for popped capacitors on the powersupply to make sure that the backlight inverter is getting the 24v it needs to operate properly.

Please rate if this helped :)

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It is either the backlight inverter circuits went out or the power supply for the inverter is bad due to bad caps, you will need to open it up and look inside.
Look through my pictures so you will know what bad caps look like.

Service manuals:

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Yes, It sounds like the backlight inverter circuit is shutting down. No inverter power, no backlight. On some monitors the inverter circuit will shot circuit the power power supply which makes the power light flash on some it just kills the backlight. You can usually check with a flashlight. Hold the flashlight pointed at the screen and see if you can see any of the icons or background picture. If you can then it is the backlight circuit or backlight tubes, usually the circuit.


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