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NEC PX-42VM3A 42" Power problem
With this symptom, it is impossible to tell what the exact "Cause" of this
symptom is. Contrary to what people may think, he LED's do not tell us what
is wrong, sometimes, the symptoms may
indicate the "Area", just say 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 fire 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, in your case,
NEC, contact, a local office, and ask for a
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
Hi. When I switch on my NEC 42
CHECK FUSE AT Y-SUSTAINER PCB. IF BLOWN, DO NOT REPLACE IT! LOOK AT SCAN CONVERTORS BOARDS. THEY ARE CONNECTED BETWEEN Y-SUS AND PLUGS FROM DISPLAY(LEFT SIDE WITH FACE DOWN, BACK OPEN). SCENARIO: SCANS GOT BURNED(LOOK FOR A SIGNS AT THOSE LONG BOARDS: UPPER&LOWER).FIND ANY IMPERFECTIONS: REPLACE ALL 3 BOARDS: Y-SUS, UP/LOW SCANS.LAST THING: IF FUSE IS OK, CHECK POWER SUPPLY FOR BLOATED CAPACITORS(BIGGEST BOARD IN A MIDDLE OF THE SET) SAME SERVICE POSITION.
LET ME KNOW HOW TI GOES.
ALEX'S TV?PHILADELPHIA, PA.
Vw37l no sound no picture
yes that is what you need main board.i have
47 inch with same problem and I put the main board and now is working
How do I remove teletext?
The teletext button on the remote control handset, has usually a toggle action. One press for on and another press for off.
Hope that helps.
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