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I have a Sony pfm42b1 plasma tv and I get a fuzzy distorted picture. Also, I hear a loud buzzing from one of the transformers. Can anyone help me on this?

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  • Steve Yelmene
    Steve Yelmene May 28, 2010

    I have a Sony pfm42b1 plasma tv and I get a fuzzy distorted picture. Also, I hear a loud buzzing from one of the transformers. Can anyone help me on this?

  • Steve Yelmene
    Steve Yelmene May 29, 2010

    I have a Sony pfm42b1 plasma tv and I get a fuzzy distorted picture. Also, I hear a loud buzzing from one of the transformers. Can anyone help me on this?

  • Steve Yelmene
    Steve Yelmene May 29, 2010

    I have a Sony pfm42b1 plasma tv and I get a fuzzy distorted picture. Also, I hear a loud buzzing from one of the transformers. Can anyone help me on this?

  • Steve Yelmene
    Steve Yelmene May 29, 2010

    Looking forward to working with you!

  • Steve Yelmene
    Steve Yelmene May 29, 2010

    Here are my voltage specs and measurements. Were you able to locate a service manual?



    vs=150-170 reading=165
    va=50-70 reading=67
    vcc=4.75-5.25 reading=5.14
    ve= +17 reading=16.95
    veq=+18 reading=-106
    vey=+18 reading=-161
    vx=50-100 reading=90
    -vq=120-170 reading=-124
    vsc=70-120 reading=-51.3
    -vy=150-180 reading=-175
    vra=0-2 reading=2.1
    vrr=3v reading=3
    vrs=0-3 reading=1.5

  • Steve Yelmene
    Steve Yelmene May 29, 2010

    I don't know if I already added the comment or not. But here is the measurements I came up with and I was also going to ask if you came across a service manual.



    vs=150-170 reading=165
    va=50-70 reading=67
    vcc=4.75-5.25 reading=5.14
    ve= +17 reading=16.95
    veq=+18 reading=-106
    vey=+18 reading=-161
    vx=50-100 reading=90
    -vq=120-170 reading=-124
    vsc=70-120 reading=-51.3
    -vy=150-180 reading=-175
    vra=0-2 reading=2.1
    vrr=3v reading=3
    vrs=0-3 reading=1.5

  • Steve Yelmene
    Steve Yelmene May 30, 2010

    you got it buddy, give me a chance to look things over and get back with u. Did u leave me a link to the service manual so I can downoad it? I didn't see one. Please get that too me so I can see what we are looking at.



    Thanks,

    Steve

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3 Answers

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That sounds like a HV circuit problem. Where is this transformer located? Sustain board?

Posted on May 29, 2010

  • 5 more comments 
  • Steve Yelmene
    Steve Yelmene May 29, 2010

    it is located on the power supply board. it is a hv problem. i am in the process of testing the voltages and documenting them. let me get back to you with a full report. unless you have repaired a few and already pretty much know where the problem is? There is resistor that has been fried on that board. the location is r203 and I need to know the value.

  • eagle338
    eagle338 May 29, 2010

    Try the color code. Resistors have color code on them that you can use to read the values. If you don't know how to read them please refer to guide below.
    http://www.elexp.com/t_resist.htm
    Yes I did see this problem a couple of times on a different model but they were 42" sets as well. But this kind of problems cannot be pin pointed exactly without checking the circuits first one at a time.. I will see if I have a service manual for this model.


  • Steve Yelmene
    Steve Yelmene May 29, 2010

    Thanks for the info. let me get back to you tomorrow and give you some voltage mesurements. The resistor is a little burnt. That's why I wanted to give you the part location on the board. We will talk about the rest tomorrow and have a great evening. We will see if we can pinpoint this problem together. TTYL

  • eagle338
    eagle338 May 29, 2010

    Sure thing. Good evening to you too.

  • eagle338
    eagle338 May 30, 2010

    Here is the service manual. Sorry I was kind of busy so could not respond. I should be free in a couple of hours and will compare the readings you have posted.
    http://www.megaupload.com/?d=A0O56QZL

    Sai.




  • eagle338
    eagle338 May 30, 2010

    Ok. I am back. Now the values you have sent me don't make much of a sense to me. Please let me know what are your test points. See service manual and lets talk with respect to that so that it will be easier to ensure that we are on the same page.

  • eagle338
    eagle338 May 30, 2010

    Yes that is indeed the link to the service manual. Download it and have a look.

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Forums.futura-sciences.com/.../56514d1222941113-plasma-sony-pfm42b1e-sony-pfm42b1e-plasma-tv-sm.pdf Above is your service and repair manual, below is your user manual BOTH have invaluable information, please download and use both, thanks. http://esupport.sony.com/perl/model-documents.pl?mdl=PFM42B1

Above is your service manual, inside this manual are troubleshooting procedures, use these and you will soon isolate your problem.
With this symptom, it is impossible to tell what the exact "Cause" of this symptom is. The LED's 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, 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.
So, it is nearly always my professional opinion that one should always get a "Quote" from the manufacturers recommended service center, Toshiba in your case, please contact a local or 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 28, 2010

  • Steve Yelmene
    Steve Yelmene May 29, 2010

    there is a ... on your service manual link (it didn't give me the whole link). I do now have the needed equipment for testing purposes and went to college for consumer electronic repair and have practiced it as a hobby through-out the years. So, for me to take it to a service center is a huge insult. Being that I have the knowledge to do these sort of things myself. I understand technology has gotten more complex. I have kept up with it. The reason I am on this site is to talk to experts with more experience than me to get ideas. Not to be referred to paying more money out of my pocket! Please send me the link to the service manual again if you would though and thanks for all of you thoughts. I appreciate most of them.

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I believe your power supply is the problem. The fuzzy picture is due to panel voltages that are "unclean" or drifting out of spec. The buzz is caused by a worn transformer or may be coming from the panel due to the "unclean" power it is receiving. You could replace the failing supply, but the part cost is very high (as are all parts for this model). The part number for the power supply is: 98850485. I was able to find it on Theyservice.com at a whopping price of $1,695.25. At current Plasma TV prices, you could buy 3 new units for the cost of this single part. I would advise replacing the unit once it becomes too unbearable.

Posted on May 28, 2010

  • Steve Yelmene
    Steve Yelmene May 28, 2010

    What part goes bad on avereage to cause this? do you know where I can get a service manual

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