Question about NEC PlasmaSync 42VP4D 42 in. HD-Ready Television

6 Answers

NEC PX-42VP4G Power supply

Hi Dan, You gave me some good advice last night, but I am still struggling. I have posted some more comments and would value your opinion. It still looks like a power supply to me, but I am no sort of TV expert! Thanks, Lew.

Posted by on

  • 8 more comments 
  • Cosmologist May 14, 2008

    Hi maklean, Thanks for pointing me to the Users Manual, but I think I have a fault situation. I have posted a lot of information about the symptoms on the Fixya site last night. It seems to me that I have a power supply fault - the 170 V rail seems to cllapse under full load. I'm looking for a way to fix that problem. Lew (Cosmologist)

  • Cosmologist May 14, 2008

    No, I don't have a circuit digram for the power supply, but one certainly would help. The supply is labeleld PNT-426 Origin Electric, China. (Note that it is rated for 240 V 50 Hz input, as I am in Australia.) Have you read what I posted last night? With a bit of advice I am confident that I can find the fault and fix it. Because the set works perfectly without video I think the fault cannot be too serious.

  • Cosmologist May 14, 2008

    Hi Maklean, My TV is a PX-42VP4D. First you sent me the link to the users manual for a PX-42VP4A/PX42-VP4DA, which I assume is similar. Now you seem to have sent me a link to the manual for PX-42MP2. I don't know the relevance of that, but I think I need a service manual rather than a user manual.

  • Cosmologist Jun 04, 2008

    After further investigation, I can state more clearly the problem with my NEC PX-42VP4G: It is a power supply problem. The 170 V DC supply (which is rated at 1.64 A) can only supply about 0.3 A. This is enough for perfect operation of OSD and menus (lots of black areas) but the power supply shuts down at about 0.6 A when I connect video to the Video 1 or Video 2 input. The capacitors related to this supply 2 x 200 uF, 400 V & 1 x 1,500 uF, 200 V, are OK. There are signs of hearing on the PCB under the 170 V transformer and the two silicon devices in parallel that switch it.
    Does anyone have a circuit diagram for this power supply, Origin Electric Co. PNT-426, or any experience with this problem?

  • Cosmologist Jun 04, 2008

    I a problem with my NEC PX-42VP4G plasma TV. It is a power supply problem. The 170 V DC supply (which is rated at 1.64 A) can only supply about 0.3 A. This is enough for perfect operation of OSD and menus (lots of black areas) but the power supply shuts down at about 0.6 A when I connect video to the Video 1 or Video 2 input. The capacitors related to this supply 2 x 200 uF, 400 V & 1 x 1,500 uF, 200 V, are OK. There are signs of hearing on the PCB under the 170 V transformer and the two silicon devices in parallel that switch it.
    Does anyone have a circuit diagram for this power supply, Origin Electric Co. PNT-426, or any experience with this problem?

  • Cosmologist Jun 04, 2008

    Soory puncbala, I don't need another manual

  • Cosmologist Jun 04, 2008

    Thanks Shivam4529, I don't see any burnt wire so I have responded by e-mail.

  • Cosmologist Jun 04, 2008

    Thanks Ekse, Dan does know about this problem, and was going to get back to me. It would be good if you let him know the new information that I posted today.

  • Cosmologist Jun 04, 2008

    I already relied to this one on 14 May. I need more specific help, which is why I posted additional information about my problem today.

  • Cosmologist Jun 04, 2008

    Thanks IrishDruid. I will look at the web site later (it sound excellent), but I'll just hang here for a bit longer to see if there is anyone here who knows this problem. Lew.

×

6 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 4,234 Answers

I am not aware of any manuals available from NEC. They generally so not supply service manuals outside of authorized service centers. Please post this directly to me as I have no way to track it otherwise. I will look into the power suplpy for this set int the meantime.
Thanks,
Dan

Posted on Jun 04, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 2,712 Answers

I think it would be easiest to simply replace the whole power board, if the solders are a problem.. Just doing a touch up job could result in further issues down the line. If one of the larger ccomponents on the board are faulty, say the transformer or thr relay, then just replace those parts.

Try http://servicemanuals.vstore.ca/ for a service manual for your TV. Even if they do not currently have the manual, they will acquire one for you. Not only that, if you purchase a manual from them, they will assist you find parts online as well an provide online assistance. This is from their website:
"We have been repairing televisions for over twenty years. We are now offering a service for UNLIMITED online support along with a service manual so we can work together at diagnosing your problem. Just click on your manual to add it to your cart. Youre paying for unlimited support not the manual. All manuals will be emailed to the address you register with, and all manuals will be emailed within minutes of placeing your order. Along with each manual you will have unlimited professional support so you can diagnose and repair your television yourself. We will even provide you the links to purchase any parts that you may require. So if youre tired of paying astronomical prices just for someone to look at your set,you've come to the right place. Look forward to diagnosing with you."

Hope that helps, and Good luck with the repair! Should you require further assistance, please post back as to the steps you took, and I will try to assist you as best I can.

Posted on Jun 04, 2008

  • Swilin Sampson
    Swilin Sampson Jun 04, 2008

    It seems most likley that the transformer is overheating, as is the relay, hence the wear on the PCB below them. Probably your nest bet would be to replace them both..

×

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • NEC Master
  • 13,433 Answers

So this problem is directed for Dan? Should I get him?

Posted on Jun 04, 2008

  • Ekse Jun 04, 2008

    I sent Dan a message.

  • Ekse Jun 04, 2008

    I'm sure dan will contact you as soon as possible.

×

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

    Champion:

    An expert who has answered 200 questions.

  • Expert
  • 230 Answers

You can get the user's manual for PX-42VP4A/PX42-VP4DA here

http://www.brightandsleek.com/NEC_PlasmaSync_PX42VP4DA_PX_42VP4DA_ExtInfo_p/px42vp4da.htm

Posted on Jun 04, 2008

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Filmmaker:

    Uploaded 5 video answers.

  • Expert
  • 150 Answers

Hi just saw your
wire
if it is burned
then replaced it
if not then contact me now at mango4529@rediffmail.com

Posted on Jun 04, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Genius:

    An expert who has answered 1,000 questions.

  • Master
  • 1,665 Answers

Users Manual for NEC 42VP4 / 42VP4D / 42VP4DA / PX-42VP4A at link
http://www.retrevo.com/s/NEC-42VP4D-TVs-review-manual/id/563bh729/t/1-2/

Posted on May 14, 2008

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos May 14, 2008

    Do you have the diagram for power supply? There should be a transformer with various voltage outputs that produces also 170V.

    But i think some experience and special electronic tools are needed to troubleshoot and repair it.

    Perhaps is better to take it to an authorized service station to check for its normal operation.

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos May 14, 2008

×

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Looking for a power supply for a NEC PX-42XRA4 plasma tv?


Paul, Check the attached links, not much on this power supply.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
NEC TV Power Supply Board

NEC Plasma TV Repair Part Number Guide for NEC Hitachi Fujitsu Plasma...

Repair KIT Capacitors FOR NEC Plasma TV P506Y1 FOR Power Supply Ypsu J011A...

REPAIR SERVICE FOR POWER SUPPLY BOARD OF NEC 50XP10 50 PLASMA TV

Mar 08, 2016 | NEC Flat Panel Televisions

1 Answer

PX-42XM5A Service Manual


Send your email address to me by Fixya comment, and get a copy of it by return mail.

Jul 14, 2012 | NEC PlasmaSync PX-61XM3A 61 in. HDTV-Ready...

1 Answer

Hi. When I switch on my NEC 42" Plasma (PX-42VM3A), the on light changes from red to green but then nothing happens. I have box-loads of spare parts but would appreciate any assistance in pointing me in...


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.
GOOD LUCK,
LET ME KNOW HOW TI GOES.
ALEX'S TV?PHILADELPHIA, PA.

Apr 06, 2010 | NEC PX-42VM3A 42 in. EDTV-Ready Plasma...

1 Answer

Power issue NEC PX-42VM5A


Most likely a transistor - NEC used FSM series for a while which are now discontinued. Let me know if you need info on how to find/tell which parts are bad.

Jun 22, 2009 | Emerson LC320EM8 32 in. LCD TV

1 Answer

NEC PX-60XM5A 8 Blinks


Overheating issue. Check your power supply board.

May 23, 2009 | NEC PlasmaSync PX-50M5A 50 in. Television

1 Answer

Power supply issues


hi there, i recommend replacing the entire board. once you have a short like this, the micro board itself will become useless. the thin micro circuitry has become separated within the layers, preventing a closed current transfer. its best to order a new canvas so to speak.

Mar 11, 2009 | NEC PX-42VP4PA 42 in. EDTV-Ready Plasma...

1 Answer

Problem with my NEC PX-42VP4PA


it goes on for a while and then shuts off after then the colour show not good i need help for this problem

Sep 12, 2008 | NEC PX-42VP4PA 42 in. EDTV-Ready Plasma...

1 Answer

NEC power supply unit


I have most NEC plasma boards and know the procedure to determine which board is bad.

Aug 26, 2008 | NEC PlasmaSync 50MP1 50 in. Television

2 Answers

NEC PX-42VP4DA- Won't stay on


Yeah, it's the power supply.  I've ordered (2) of these power supplies used, and the same problem seems to be happening with both.  The transformers on the power supply board (namely, the 170+ volt one) are the problem. You have several test points on the power supply board which you can touch with a voltmeter to see if your television is getting the correct voltage .  Mine made a a high pitch squeal which indicated which transformer was bad. If you find a place to get the transformers new - id like to know, because mine is still non functional because of this and the fact that a new PS board is over $600.  

Jul 14, 2008 | NEC PlasmaSync 42MP1 42 in. Television

1 Answer

NEC PX-42VP4G Power supply


Check to be sure that there is no voltage on the input line. You don't indicate what input you are using. Since the set appears to work without an input connected, try looking at the input cable. Also, if the problem is internal to the set, shorting the input jack would cause the same behavior. Please update this with what you find.
Dan

May 13, 2008 | NEC PlasmaSync 42VP4D 42 in. HD-Ready...

Not finding what you are looking for?
NEC PlasmaSync 42VP4D 42 in. HD-Ready Television Logo

773 people viewed this question

Ask a Question

Usually answered in minutes!

Top NEC Flat Panel Televisions Experts

The Knight
The Knight

Level 3 Expert

68180 Answers

Brian Sullivan
Brian Sullivan

Level 3 Expert

27725 Answers

Kyle Steven OHare
Kyle Steven OHare

Level 2 Expert

111 Answers

Are you a NEC Flat Panel Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...