Question about Philips 30PW9100D 30" TV

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Thin White line on Philips 30PW9100D/37

I own a Philips 30PW9100D/37 HDTV that I've owned for about a year. It has a LO5.1UAA chassis.

A couple of months ago, it began an intermittent problem where it would form a thin white line on start up:

I found that by turning it off and on several times, it eliminated the problem for a month or so.
Most recently, the problem "stuck". I tried turning it on and off, only to find this problem:

The bottom half of the screen white, distorted, and out of alignment. Occasionally, it would appear brighter, and then shut off after 30 seconds or so.

After much searching online, I've found that this seems to be a familiar problem with Philips sets, particularly a 27 inch. But since its a different chassis, I can't match the parts.

I also found a service manual for the set, so I've been able to take it apart and look for burnt resistors and bad capacitors. But as of yet, nothing has stuck out.

The LED on the front of the set blinks a code that doesn't seem to match any of the error codes I've found. (It seems to be 8, followed by 34, followed by 33.)

The service manual suggests, on a thin horizontal line, to check three transistors at the Vertical Deflection circuitry.

My questions:
There is a deflection board that stands up on the side, and is separate from the mainboard. Is this part of the vertical deflection circuit?

Two of the three transistors that it asks me to check (7451, 7523, and 7543) seem to be on the mainboard, but I can't get to them easily and don't know how to check them. Is there a way to check them with the power off?
If not, is it okay just to replace them?

The third transistor (7523) doesn't seem to exist on the board or the parts list. Now what do I do?

And then there is this:

Note the resistor in the center. When I removed the deflector circuit board, I found that resistor soldered between two points. It doesn't exist on my schematics. , or PCB layout from the service manual.
The set was bought as an open-box item, but this appears to be some sort of nasty repair job? Or am I completely wrong?

Where do I start?
Is the deflection board (the one I can remove) a vertical or horizontal deflection board? If its a horizontal deflection board, can I assume that the problem is not there... but somehwhere on the mainboard.

Also, while following other suggestions on what to check, I found resistor 3414; which is supposed to be 4.7 ohms on my parts list, but is coming up on my multimeter as 90plus ohms. Is that significant, or more likely a bad reading?

Any and all help is appreciated, and I'm pretty much willing to try anything.


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  • 2 more comments 
  • ChicagoJohn Mar 14, 2008

    Thanks, Vyra. I'm in the middle of pulling the mainboard out, and I'll check that first.


  • ChicagoJohn Mar 16, 2008

    Thanks Ed, that helps a ton. I'll check it out once I get the board pulled completely out. (There is a huge Anode connected to that board. I've drained the voltage out of it, but I want to make sure I disconnect it from the main board correctly before I move on.)

    I've read in a number of forums that this chassis seems to have a few defects. So I'm taking all of that for granted.


  • ChicagoJohn Oct 18, 2008

    I fixed the problem.

    The complete answer is here, but the short answer is that it was either a capacitor or a vertical deflection IC.
    I changed 3 capacitors and the IC to be safe.


  • Robert Sawart Dec 18, 2008

    Same problem but only a thin line acrros the screen now and not knowing what to do to make the Horizontal line back to normal again. Remote not available with my tv. GOT ANSWERS?


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Posted on Jun 13, 2008

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I recently had my phillips 27" model 27PT6341/07 repaired after warranty expired due to white lines appearing at the top of the screen. The shop advised that it was a capacitor giving me the problem. So, after getting it back, I examined the repair job and the shop had replaced a capacitor at the back of the main board, next to the rear rca inputs. It is labeled 10uf 100v. I was told that it would fail again soon because it is a manufactures defect. For me it is at location 2465. Here are a couple of photos of the part.

Hope this helps,

Posted on Mar 16, 2008

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I'M not an expert for this stuff...regrading your information I quietly think for to check all the " BIG " capacitor around and nearst the FBT ( they have 100V or more 100-400V ), I never seem like tv set you have..he..he.....So I cant assume about the standing board, my suggestion some Yoke have cable connection for the high voltage ( about 4 or 5 pairs ) from the can check that out.... For transistor you can check in live condition or off condition,but...I recomended for to check in off condition by pull out the Tr,check whit DVM or Analog Multitester in 1K meter position......

Hope hear from you soon...



Posted on Mar 14, 2008

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