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Phillips flat tv p/n 30PF9946D/37. nomenclature for screen illumination light.(backlight?) Want to order light.

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Hello Jilinzels the problem with your tv set is not the backlight, this problem is usually caused by the inverter board which supplys the power for the backlight to work,for the backlight to your tv set model # contact philips they have one in stock and ready for shipping, if you would like to take my word click on the link below there is a new inverter board for your tv set,you can change this board out yourself with the instructions that come with the board just be very careful when doing so,hope this helps if you have further questions feel free to ask me thank you.

http://www.electronica-usa.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=EU&Product_Code=INV01007

Posted on Sep 06, 2009

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Posted on Jan 02, 2017

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My Phillips TV (42PFL7422D/37)light comes on to show power but the screen does not light up. It does have sound. Guy on line stated it most likely is the T-con board/LCD controller. That this is common...


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I have a Phillips flat screen TV model # 30PF9946D/37 serial YA1A0445041669 The power works, the volume works but the picture went away as I...


It can be power supply, backlight inverter, main board, T-CON board.
First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board.
if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having.

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

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: 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.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
Please post back what you find.

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Replacement boards can be found at a good price at Shopjimmy.com

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1 Answer

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In the service shop, they try the parts to verify.


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