20 Most Recent Philips 30PF9946 30 in. HD-Ready Plasma Television Questions & Answers

1 step can confirm if you can fix this. Press menu. If you can get a menu its fixable if you cant its in need of major repair.

You may be able to get an inverter board from this WEB site.LCD screens and Inverterswww.lcdparts.net

I had the same issue. I took it to a local repair guy and he repaired it for me for $98. The soldering on the inverter board is what is creating the issue. In some cases they can re-solder it and be done or in other cases need to replace the inverter board. It's not that expensive to fix.

try to check the cathode lights of your plasma it might be busted.

Hi


Thanks for using FixYa. A plasma TV is a very hard working device. It is working harder than any TV that has been built before, and as a result it produces a lot of heat. 75% of technical problems in plasma TV's are caused by overheating problems. You’ll need to check the power supply board first for any swollen/bulged capacitors. As power supply board is the hardest working board in a plasma TV, it develops voltage to supply all components, high current + high voltage. All this is only recommended if you have electrical expertise & know how to solder/re-solder components as these units contain high voltages even when switched off. These kinds of issues in plasmas usually occur after 3-4years. Please do accept the solution if the issue is resolved or post a comment for further assistance.


Thanks
Rylee

Do the unit turn on when you switch it on?

These sets have capacitor problems in there power supplies. These capacitors will leak and cause voltages to fluctuate. Have a repair shop check it out.

Oh yeah, you can most certainly change the power supply by yourself.

It's easy to locate - just follow the power cable - and easy to replace.

Only make sure to let it discharge before you operate it. 10-15 minutes disconnected from power should do.

However, there's no guarantee that the problem is in the power board.

There is a very good chance it is, in fact, not there.

There's another board which commonly fails on many plasma TVs and the effect is exactly as you describe. It's called Y-Sustain board and you can tell which one it is by looking at the side of your TV and seeing which large board has manny plastic connections that enter the display on the side.

That board often has one or two fuses on it - I'd check those first.

what you have is a bad inverter transformer on the inverter board. I nashed my teeth on this problem for a long time because no diagram is avail. Here's the fix for you:

Remove the invertor board. Take an Ohm meter and measure the outer 4 legs of each transformer. Between pins 1 and 4 (side with the white dot near leg 1) you should read .3 ohms. This side is usually good. Between pins 5 and 8 you should read approx 1.8 to 1.9Kohms. ANYTHING above that is a defective transformer. I'm sorry I do not have the part number for this, I've just been using an old board from a set with a cracked panel. If I can find a part number I will try to post. You can try Encompass parts on the web, they may be able to supply part number and transformer with location number.

Rick
W2ICA

I am wondering what you are making the connection with, If you are using s-video or composite from your tivo to your hd tv it will only produce 480i. in order to get 480p and above you will need a component video cables or better(hdmi) in order to produce the signal. You may have already known this, but I couldnt tell be the information provided. Hope this helps.

Sound no picture or shut down Power led starts green then a short amber then turns RED . If your power supply can be confirmed to be go you have a bad Inverter board. Per the manufacture this part comes only with the panel . Not cost effective . But if you go to
lcdparts.net you will locate an inverter for $ 169.99 . I had the same problem and the inverter repaired the set . Note there are similar error codes but from what I can see from all of your complaint I do be leave that your Inverter is bad . Good luk
Chongo

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 sci.tech-archive.com 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:

http://sci.tech-archive.net/Archive/sci.electronics.repair/2008-05/msg00508.html

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

"Max" <maxg70@xxxxxxxxxxxx> wrote in message
news:hb6dnebEeZuhqrfVnZ2dnUVZ_sDinZ2d@xxxxxxxxxxxxxxxxxx
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.

Arfa

Hi Mark, I have a Phillips 30pf9946 LCD TV, the back light has gone I have the stand complete with screws. Also have remote control!

You have sound but no picture. Green power light is on and NOT flashing. You get a screen flash or flicker on power-up or even a minute of screen before going all black. It is your inverter board. Common problem on LCDs (maybe more so on Phillips?). They are easy to replace (unplug-plug) and are available on the net.

Veritas