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Philips 30pf9946d/37 Backlight Issue

I have a Philips 30pf9946d/37 with a bad backlilght. The picture comes on but there is no light. How can I determine whether I need to replace the master or slave backlight?

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

Jerry G.

Posted on Apr 12, 2008


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No picture problem on Philips Flat TV 37PF5321 37 in HDTV-Ready Telvision

I am suffering from the same problem. When I turn on I get sound but no picture, although I do get the backlight coming on when I turn it on, I then get about 1/2 a second of picture then nothing. Even if I select TV specific functions such as the menu, I get no menu screen come up.
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My philips lcd tv has sound but no picture what is

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There are two places to look for the problems, the backlight inverter board and the power supply. Look at the power supply first since it is easier to get to, look for burnt parts, bad capacitors, etc.
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Bad power supply or backlight inverter.

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Philips are legendary for having power supplies that fail due to bad capacitors, so that could be the culprit as well.

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

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.

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50 in philips hd plasma with ambilight model number 50PF9631D/37

The x-sus and y-sus panels have some fuses,check to find out wich panel is broken and replace.

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Philips FlatTV Black Screen 30PF9946D/37

I have the same problem and was told by my local TV repair shop I needed a new LCD panel (at $2000!!!) which I don't believe for a moment since the panels themselves rarely fail. After digging around on the net, I came across a posting from "Arfa Daily" on the website which points to either the backlight inverter board or the power supply. So far, it is the only intelligent thing I've found that makes any sense. If anyone follows this up and sucessfuly repairs your set, please let me know! ....Acepayday

I will re-post his/her answer here but to read it yourself goto:

  • Date: Wed, 14 May 2008 10:07:05 +0100

"Max" <maxg70@xxxxxxxxxxxx> wrote in message
sstepanov@xxxxxxxxx wrote:
Hello! I have a Philips 30PF9946D/37 30" LCD that no longer turns on.
Upon pressing the power button, the status LED goes from green to
amber then to red.

Is this a common problem with these?

Thank you!
Could be ps board.

It's a common problem with all LCD TV sets. First, try unplugging the
display panel's backlight inverter board. It is very common for these to
fail and cause the set to revert to standby. Otherwise, it's most likely
that the PSU itself is faulty - also very common.

Examine it *very* carefully for bulged electrolytics on the secondary side.
Note that these may be 'hiding' under bits of heatsink, so look carefully.
Also, check all large and heatsink-mounted devices, for bad (lead-free !!)
joints, which is another common cause of your described symptoms. Other than
this, you're a bit 'on your own' with LCD sets. There are other possible
causes, such as bad sound output chips, but if you really do have a power
supply problem that's not one of the things described, then you will
struggle to get to the bottom of it without schematics, and an intimate
knowledge of switchmode power supplies. These LCD ones are infested with
monitoring circuitry for output voltages and over-current conditions, and
they all work on the standby supply, so if *any* unexpected condition is
detected either at startup, or during use, the standby supply is momentarily
stopped, which causes the system control micro to reset back to its 'sleep'
condition, removing the 'power on' signal to the power supply. Depending on
the set, that may then be an end to it until you try to bring it out of
standby again, or it may just keep trying on its own, causing a flashing
power light.

If you can prove which board is causing the trouble, you might want to
consider just replacing that board. PSUs and inverters for many sets, can be
found astonishlingly cheap on the 'net and e-bay sometimes.


Aug 14, 2008 | Philips 30PF9946 30 in. HD-Ready Plasma...

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