Question about Philips 9P5034C 50" Rear Projection Television

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Help When the set has been off all day..You can turn it on and the picture goes down to a small square then back big..Does this til it gets warm.. about 10 mins max. but I know it will only get worse...Any ideas

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Re: help

Hi, you need to replace IC 7412 part number 4835 2098 8561 this is a veeery common failure for your set, it`s a pain to get out and new one back in but it will fix your problem, looking from the back into the set it`s located on the right, rear side of the board, there are several of them close together, be sure it says cnw136 on the top of it and if you do it yourself put the new one in exactly the same way as the other one came out, if you rotate it 180 degrees it will fai at turn on, 8 pin IC with "cnw136" printed on the top of the IC, BMW Rider

Posted on Jan 11, 2008

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When tv is turned on, in about 10 to 15 seconds the screen goes blue. If the tv is turned off, then turned back on, the picture is fine for about 10 seconds then back to the blue screen.

This is simple--this model is prone to bad picture tubes--blue is most common--screen goes bright blue and set shuts off--set is detecting too much current being drawn--forget replacing the tube--very expensive as only available on rebuild basis.

Here is what to try:
1) you need to remove entire plastic grill under screen--held in one of two ways--either several screws on back on either side or two screws at bottom front under caps.

2) With it free, pull up from bottom and tilt entire grill to the left--the front controls are mounted in it and you will need to undo some ties that hold it to get it out of the way.

3.) Grill has tabs at top that tuck in and you lift it from bottom.

4.) Remove small inspection plate behind grill--a few screws.

5.) Directly behind grill you will find a square black plastic block with 6 shafts (they are controls) One row left to right will be marked Focus--do not touch those. The other row will be marked screens. Look closely (green is the middle one) as each will have r,g,b in small black letters.

6.) In your case LOCATE THE BLUE SCREEN CONTROL. Best way to do this is take set to unused video input and turn blue SCREEN down (usually to the left and less than 1/4 turn) until the blue just goes away---on blank input you should only see VIDEO 1 etc in green.

Do not turn down too much--just enough so blue is not there--no blue background or curved lines.


You only have seconds if the set is shutting down, Once you get the blue down enough set will stay on.

Take to regular channel and with color all the way off--you should have a black and white screen, adjust just a little if needed.

I have done this many times and most get another year or more out of the set--if one of the tubes is causing this (very likely) sooner or later it may get worse and return to the point where adjusting does not help--when this happens replace the set.

If this has told you something that helps you or you did not know rate this solution as very helpful as I do this here for free.

If you have questions let me know BEFORE you attempt it.


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Good Day;
You may have bad picture tube or convergence problem. Good Luck, big IRIShH.

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Hitachi 53UWX10B

Good Day, Armenian;

You may have CRT Coolant on one the boards. LOOK very closely for shiny spot on any of the boards. WHY? Because you are saying the TV is having multiple problems. Let me know.
Good Luck, big IRISH.

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Picture trouble

Good Day, britt93;
It sounds like you have the TV's CLOSE CAPTION on; in the text mode, turn off and you and the TV will be fine.
Good Luck, big IRISH.

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Hitachi 50UX26B

Good day, seanhanna;

Hitachi has LED’s, green ‘lights’ and a red light to determine what circuit may be the problem; after removing the back of TV, bottom only, plug TV back in and observe which LED’s come on …..BUT most important which LED’s don’t come on; locate and note number, EG; DP37 and etc.

Good luck, big IRISH. Ps let me know.

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Good Day, peterferd;
Try resetting the TV by unplugging from A/C outlet wait 3 to 5 minutes then plug back in. No fix? Call service company.
Good Luck, big IRISH.

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1 Answer

Picture loss

It sounds as though you have what is referred to as a climental problem. In laymen terms, a transistor, chip or regulator is heating up and breaking down. The way a technician normally isolates this type of problem is by using a cooling agent ( freeze spray ). When the set heats up and the picture goes away, the technician sprays some of the cooling agent on a part of the board ( select a small area, about 6 inches square ) at a time and see if the picture comes back on. When you do finally get to the bad area, the picture should come back on for a short period of time until the bad part heats up again. After a period of time and by using the freeze spray, a person can isolate the exact bad part. Replace that bad part, and any filter capacitors hooked to that bad part and the set should work properly. As always, use caution and unplug the set before opening the set and when using the freeze spray, be sure not to touch any connections in the tv as they could produce shocks.
I hope this has helped and good luck on your problem.
NC Electronic
Mills, Wyoming
Have a Great Presidents Day

Feb 18, 2008 | Hitachi 57SWX20B 57" Rear Projection...

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Blue Tint

Most likely cause would be a loose solder connection that expands as the set warms up until it no longer makes a connection. You may get the blue to come and go by hitting the side of the cabinet after the set is warmed up awhile. (don't hurt your hand doing this, and don't keep doing it to "fix" the set. The connection will have to be located and repaired). Otherwise, there could be a component going bad, including the blue picture tube.

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