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I have a LG M# RU-42PZ71. It has many vertical lines and snow in picture only. Which module is bad?

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  • jbtv2123 May 29, 2010

    May 28, 2010 - My previous reply may not of got through. I am a retired TV repairman of over 40 years. I have been out of service for six years,and not up to par on newer TVs. On the RU42PZ71 problem. Set has vertical lines & snow on all inputs. I have replaced the 6871QCH034A module " same thing"

    Previous answer was not satisfactory. Problem in all inputs.

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  • LG Master
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Http://elektrotanya.com/lg_plasma_training.pdf/download.html
www.scribd.com/.../LG-TV-Plasma-Training-Manual - 7 hours ago
These service and repair manuals, are what the engineers use to troubleshoot and repair these units. Work through the troubleshooting procedures and you should be able to isolate your issue.
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
www.scribd.com/.../LG-Training-Manual-TV-Plasma-60-INCH-PDP Another Training manual.

Posted on May 29, 2010

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  • Master
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If it is getting a lot of snow in the picture like it was from the analog days it would most probably be the tuner. Is there a lot of statick on all feeds and channels? also,what type of connection are you using/attempted to use?

Posted on May 28, 2010

  • jbtv2123 May 28, 2010

    I am a retired TV repairman with over 40 years experience. Retired six years ago and not up to date on newer plasmas. I have replaced the 6871QCH034A board "same thing".

  • jbtv2123 May 28, 2010

    My previous reply may not of got through. I am a retired TV repairman of over 40 years. I have been out of service for six years,and not up to par on newer TVs. On the RU42PZ71 problem. Set has vertical lines & snow on all inputs. I have replaced the 6871QCH034A module " same thing"

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