Philips TV 32PW9594 blue horizontal line

[hrachtom]

Hallo,

I would advise to repair TV Philips 32PW9594. The screen will appear after a while horizontal lines and the image fades to blue. After a few off and on television works fine.
I have a service manual. The service menu are no error codes.
The repair of television I have little experience. Can you please advise me where to look for a mistake?

Thank you very much Tomas.

[Paul Stenning]

To avoid confusion this is a CRT set.

http://specsi.com/televisions-philips/philips-32pw9594/
http://www.manualslib.com/manual/123...-32pw9594.html

[HamishBoxer]

Knowing that model and being Phillips it could well be a crt problem.Though worth a check for dry joints on the crt base (tube base).

[hans]

If the g2 voltage is lowered will that remove the lines if the tube is tired? Or will it upset some automatic settings (of the black level etc?)

[Michael Maurice]

The symptoms are typical of a failing CRT, lowering the G2 is unlikely to effect a long term cure.

[hrachtom]

Hello,

I cleared the plate CRT tube, all contacts cleaned cleaner contacts.
Re-soldered connections at the amplifier and the tube socket.
The situation is the same.

I will try to set G2 according to the service manual.

After switching on the TV after about 10 minutes, the screen fades to blue and appears horizontal lines. Just a moment to switch programs and everything is OK.

Operation time TV is 18,000 hours. It is possible that leaving tube?

Thank you very much, Tomas.

[Welsh Anorak]

Hi Tomas
These tubes were prone to failure. Very often adjusting the G2 will cure it for a while. Don't follow the service manual for this adjustment as it depends on a good CRT - just experiment. I suspect your CRT is a Philips 'ECK' type made in the Czech Republic. Some sets has Panasonic CRTs fitted which are unlikely to fail.
Glyn

[hrachtom]

Hi Glyn,

TV I brought in Germany. TV was manufactured in Belgium. But it probably does not solve my problem.

Maybe CRT is from the Czech Republic and assembled in Belgium.

Bye Tomas.

[Maarten]

Certainly no ECK tube in this set. It may have a Panasonic tube with a Philips label or a Philips tube (which won't be an ECK tube but an ERF tube).

It will be useful to have a look for the type number at the label on the back of the tube itself. The number will start with W76, and there will also be a country of origin on it. Czech Philips tubes are of a later design and actually more reliable than the older French and German tubes. Panasonic tubes are from Germany as well, but are quite reliable.

[HamishBoxer]

This to all accounts is as I stated earlier a faulty crt.

[Maarten]

Possibly, but in sets using a Panasonic-sourced tube, the potmeter unit on the line output transformer tended to fail with various symptoms such as defocussing and possibly flyback lines as seen here. The flyback lines in this case are not very pronounced, so it really is useful to do some more checks (such as looking at the CRT label and turning the G2 pot a bit). Another check is to tap the neck of the tube lightly with the handle of a screwdriver.

[Hunts smoothing bomb]

Also the thing is that the set works fine for ten minutes before fading to blue, surely this isn't a tube problem?

Cheers

[Refugee]

It is possible for a bad electrolytic capacitor is going open circuit to make lines and fading.
The video parts area would be the first thing to look at.

[Maarten]

It is more or less likely to be tube-related. To determine the amount of more or less, test results and/or statistics are needed.

After doing some searching, the tube might be a French or German made W76ERF041X044 in which case the chances that further testing will point to a faulty tube are quite large. However, even in that case the tube may respond to tapping and readjusting the G2 tension so the last life can still be squeezed out of it whilst looking for a new TV (or possibly a new tube - at the end of the Philips tube era between 2006 and 2008, the largest warehouse of new new stock Philips 76cm tubes was apparently in the Czech republic where they had built a jumbo tube line in the city of Hranice just a few years earlier, so locally sourcing a brand new tube may be a real possibility).

Newer Philips tube types that may be mounted are W76ERF072X044 and W76ERF172X044, the latter one probably being the most reliable.

However, gathering data (what tube it really is) remains the first and most important step to base any further tests or conclusions on.

[Welsh Anorak]

Hi
As usual Maarten's absolutely right - it will be an ERF tube. I used to find that these would (temporarily) respond to increasing the G2 to a high value to get a peak raster then lower it again which the earlier curved ones didn't respond to.
These sets did have a LOPT whose G2 and/or focus potential tended to wander as well.
These tubes could well fail when warm so that symptom isn't conclusive either!
Perhaps you could post a photo of the tube label?
Glyn

[hrachtom]

Hello,

1) I changed electrolytic capacitors on the CRT board. The situation has not changed.

Type CRT tube is W76ERF042X044 Made in Germany.

When you search on Google, I found the discussion:

http://www.forum.radios-tv.co.uk/vie...php?f=5&t=4925

They describe where a similar problem with suggestions. I was not wised.
I do not know if there are reasonable advice, problem solving.

2) I set the voltage V2 according to the service manual. Lines disappeared, but the blue tint still sometimes appears.
The resulting image is a bit worse.

Thank you very much for your help.

Tomas.