Question about Sony BRAVIA KDL-40V3000 Television

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"Upgrade" of Backlight Panel

For a Sony KLV-32S310A, is a backlight panel "upgrade" possible? If the backlight inverter or backlight "power supply" has failed, should only the backlight "power supply" or backlight inverter be replaced? If the problem is the bad lamp(s), should the bad lamp(s) be replaced only? OR should the whole backlight panel be replaced? OR should the Bravia unit be replaced already?

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Just replace what failed.
I replace the surface mount FETs on the inverters.

Posted on Dec 06, 2008

  • thesteve42 Dec 06, 2008

    just replace what failed.

    I replace the surface mount FETs on the inverters.

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Screen is black, no picture sound is O.K


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.
http://electronicshelponline.blogspot.com/
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.
Type in the brand name and type of your device, in the search box [at the top right] of the display window; to gather down all the posts related to your device brand. It will make surf easy.

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1 Answer

Bravia Model KLV 332S550A. Why 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.
http://electronicshelponline.blogspot.com/
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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1 Answer

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T'Con board fault. 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 be troubles hooted.Contact any service technician.The circuit will differ with models and versions.
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts.It will make surf easy.

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1 Answer

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Please specified problem,Check BackLight Inverter Board look for any burnout component,then look power supply,generally Power supply shows only 3.3 or 5v in standby condition,after initialize by control engine you may able to check several power rails.

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1 Answer

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It sounds that the back-light inverter has the fault. If there is any winding short [cannot detected by measuring with an Ohmmeter], this type of fault can occur. The only thing to do is replace the back-light inverter board. The LED blinks indicates a short circuit .

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1 Answer

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Check to see if you are getting a back light by looking through the slots on the back cover. If you are getting a backlight then it is not your power board. If no back light check your connection in another outlet different room if possible or use a long extension. If still no back light then you are likely to need a new power board.
Good Luck Ed Pinero

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1 Answer

Sony Bravia KLV-32S310A model - Problem is Power supply okay but no sound & no picture. What can be the problkem?


If the power supply was given a clean bill of health by a reaputable source, then most likely a faulty mainboard

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1 Answer

Today I bought SONY KDL37EX402 LCD TV. Immediately when I turned it for the first time I noticed an unpleasant sound like a “buzzzzzz” from the back of the TV. As I worked it for more then 5 hours I...


It can be from the power supply is not able the supply enough power due to failing components in the power supply module such as DC filter caps or loose transformer core is vibrating or from the backlight inverter transformers. You will have to take a close listen to find out exactly where the noise is generated from first.

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.

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1 Answer

Sound with no picture..backlight working


This failure could be due to a backlight inverter board or the power supply is not providing the 24 volts to it.
The way to fix it is by measuring the voltages from the power supply to the backlight inverter board, if the voltage is present then the backlight inverter board is defective and will need to be replace. If the voltage is lower then 20 volts, then is a power supply failure.
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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