Question about Philips Magnavox 9P6034C 60" Rear Projection Television

5 Answers

I have a philips magnavox model number 7P5433 W101 Chassis model number PTV755-AH01 It powers on but there is no picture. What could be the problem?

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  • b_cconstruct Apr 30, 2010

    I am having trouble finding the c432. Can you send me a picture of its location?

  • b_cconstruct May 01, 2010

    I found the c432. The one on this board is a 1500uf/35v . Should I replace it with that one or use the 100ud/200v? Is there any way to test the one on the board to see if it is working or not? Also where would the STR30130 be located at? Thanks for your help.

  • b_cconstruct May 08, 2010

    I replaced the c432 now I have sound but no picture. There is a glow in the bottom of the crt tubes. Whata coud be the problem?

  • b_cconstruct May 12, 2010

    I replaced the c432. There is 27 volts at the c432 and 27 volts at the flyback. Is that low? should it be aroud 125 volts? If the voltage is too low what could be the problem?

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5 Answers

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  • Master
  • 979 Answers

Hello B cconstruct hi, your magnavox has serious issues here. even though there is power, does the TV have sounds? or just missing picture? A missing picture has problems with the HIGH VOLTAGE stage, possible the Horizontal Deflection circuit. Can you give more info, on lights you see, or sounds you hear that may be needed to diagnose the TV. Thanks

Posted on May 12, 2010

  • Jerry Umali May 12, 2010

    Hi, just to add, (read your comments) check first the power supply circuit, this should produce 115-125v DC, this is needed to power the high voltage section, (by the way, to test the high voltage section, you need to place your arm in front of the picture tube as you power on the TV, if you feel static, like your arm hair is attracted, you have high voltage). if there is missing high voltage, check voltage regulator section, since you mention there is sound, power supply is good but with localized problems, check any short circuit on the Horizontal Output transistor. or the deflection coil.

  • b_cconstruct May 12, 2010

    There is sound coming out of the speakers but no picture on the screen. There is a glow at the bottom of each picture tube.

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  • Master
  • 8,619 Answers

Hi


Thanks for using FixYa. This is often caused by failed convergence ICs. I don’t think the issue is with the power supply of the unit as the sound is coming fine from the unit. Also please check that the lamp is fine. Resistors will change value and burn. This will cause other components to become defective. This can have a domino effect and cause other parts to fail. Replacing one defective part may make the TV operate for a short time but the part will fail again since if the parts that caused the failure to begin with are not replaced. The typical cost to get this fixed by a pro is about $300 - and it doesn't mean that he/they will do a job better than you do. The parts are less than $100 (about $20-$30 for the IC's) if you want to do it yourself. Also the convergence board should be checked for cracked solder. If you replace the ICs and the resistors are shot, the ICs may blow again almost immediately. Therefore, it is always recommended to replace the ICs and the resistors simultaneously. Please do accept the solution if the issue is resolved or else revert for further assistance.


Thanks
Rylee

Posted on May 08, 2010

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  • Master
  • 666 Answers

Most likely the power supply if there was a circuit board issue it would normally give you an error msg via several blinks of the power button and a pause than repeated but will most likely need a repair technician


hope this helps
Robb

Posted on May 01, 2010

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  • Master
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The high voltage power supply needs to be replaced. You likely have a low voltage supply which is why the power button is lit once pressed, and a high voltage supply which needs to be replaced.
Locate and change C432 (100ufd/200v). Location: behind high voltage transformer.

Posted on Apr 30, 2010

  • Nate Stansfield
    Nate Stansfield May 01, 2010

    Haven't found a diagram yet. The C432 may be for a different chassis then yours. It would be the transformer right behind the power supply.

    Check to see if you have a

    main power regulator that is an STR30130 and check to see if it doesn't


    appear to be shorted. Also check the STR30130 to see if can't pass any current through it. If not it is because one of
    the resistors (R432) going to Pin 2 has burnt open




  • Nate Stansfield
    Nate Stansfield May 02, 2010

    You should replace it with the same kind. You can purchase an analog meter for a reasonable price which will tell you the readings

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  • Philips Master
  • 12,061 Answers

Http://www.scribd.com/doc/7581354/Philips-DPTV400-TV-Projection-Training-Manual
Please find above a training manual, this is what the engineers use to repair and troubleshoot these sets. have a look, If you feel competent, after reading all of it, then perhaps you may want to try for a repair, I honestly, think you should let a professional attend to it, but it is your decision.
With this symptom, it is impossible to tell what the exact "Cause" of this symptom is. The symptoms do not tell us what is wrong, sometimes it may indicate the "Area" in your case it is the X board. BUT thats NOT where the "Fault is" thats just the part that is affected. These days unlike the "Old" analogue days it just isn't realistically possible to fix anything but the most basic of problems with todays sophisticated units. This is quite apart from the Safety aspect, any unit that can cause a firs or have an explosion, or both, is NOT to be treated lightly, and and the repairer, of the unit is legally responsible, another thing to think about. Also, one must have tools, a Multimeter, a soldering iron, a deslodering iron, an oscilloscope, a signal tracer, tools, and most important of all, a Service Manual, without which, there is no way to even begin to understand and fix it, and more importantly Program it, AFTER it has been fixed. As these days a TV, is a PC, a Tuner, and an HDTV Monitor, and more, all in one. in the "old" days TV"s were more, rudimentary, and built to last for 20 years, and a "Parts" supply was set aside. They usually used to fail for only a few reasons, and they while still difficult, were less difficult to repair. Electrical knowledge was transferable, and they could be and would respond to, This-is-the-symptom-This-us-the-Fix, But that no longer applies, as now, it can be a Fault on I squared Bus, or "Sensor" failure, or it simple may have "Crashed" just like a PC, It could be a Diode go bad, and that will stop the whole thing. You see, in the day, the sets were Very "Fault Tolerant" because they were Analouge, and a faulty, component, or more sometimes, the set would always diplay something usually, and when they didn't it was one of anly a few things, sure there are always the horrid ones, and there are pleanty of those, but all in all it was quite easy. But with Digital Electronics, it either goes, or it doesnt, there are usualy few half measures. I mean thats the definition of logic either going or not. So it can take very little to completely paralyse a set, and generally give the only sysmptom, it can, by not working, usually No picture, or the like. So you, see the list is endless almost for any given SYMPTOM, as that is what is being seen, not the cause, as I keep going on about. Also any fault, usually involves the Power Supply, it is either the cause, the cause of the damage, or it is damaged. or ALL of them. Then after you have done the electronic repairs, you then must program the set to work, and align, and set up in general, any one of those settings missed or done wrong, back to square one. So, it is nearly always my professional opinion that one should always get a "Quote" form the manufacturers recommended service center, In your case, Philips (Magnavox), head office, and ask for a referral to an authorised service center, I cannot stress how important that last point is. It is even worth the cost of shipping. you see an authorised service agent, will have trained staff, trained on their brand, also they have first hand access to parts, original parts. This will actually save you money and ensure you can actually get it back fixed. Of course asking for a "Quote" also gives on the option of repair or replace. Often my clients,do not go through with repair, unless it is moderate, but in some of the more costly jobs they see it, as do i, that a replacement, with a warranty, is a better option. As an aside here, one could then tear the TV down, and sell the Known Good bits. You'd be surprised who needs parts, i myself often must by from third party sources to effect a repair. So money could be recouped, somewhat,and help out someone else.

Posted on May 02, 2010

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