Question about Panasonic PT-53WX53 53" Rear Projection HDTV-Ready Television

6 Answers

PT-53wx53 red pwr light - faint coloured 4" wide vertical line

I have a PT-53wx53 that turns on, the pwr light stays red but there is no picture, just a faint 4" wide coloured vertical line on the screen.

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  • 12 more comments 
  • Jim Haycock Dec 06, 2008

    The line is faint, a mixture of blue/green thick lines and from the bottom of the screen to the top. The rest of the screen is black. The power light does not blink at all when the set is switched on. The light comes on bright red and fades a little and stays red. I can hear the clicking of a relay as the set turns on and what sounds like the Degauss. When power is on I can hear a feint buzzing with the back off which sounds like it is coming from near the flyback. Also there is some sound but it is very low and can't be turned up louder.

  • Jim Haycock Dec 06, 2008

    The line is faint, a mixture of blue/green thick lines and from the bottom of the screen to the top. The rest of the screen is black. The power light does not blink at all when the set is switched on. The light comes on bright red and fades a little and stays red. I can hear the clicking of a relay as the set turns on and what sounds like the Degauss. When power is on I can hear a feint buzzing with the back off which sounds like it is coming from near the flyback. Also there is some sound but it is very low and can't be turned up louder.

  • Jim Haycock Dec 06, 2008

    If it is a convergence problem wouldn't the power light blink three times on power-up.

  • Jim Haycock Dec 06, 2008

    I have some electronics experience, including fixing computer monitors. This was many years ago so I am very rusty in my troubleshooting techniques. I would like to save myself the big bucks and fix it myself. I am aware of the potential hazards. Could it be that 1 of the convergence chips is short and is stopping the power from coming up also preventing the power light from blinking the 3 times I would expect with a convergence issue

  • Jim Haycock Dec 06, 2008

    I removed the board and inspected all the solder joints with a magnifier/light and re-soldered any dry joints. Also had to reseat all the cables to do this. Visually inspected the whole board for burn outs but saw nothing.

  • Jim Haycock Dec 06, 2008

    This is my first posting on Fixya and I didn't realise responses would disappear if I didn't accept them. Could the expert who posted re the caps please re-post and maybe give me an idea how I identify which are the likely bad caps. I was just trying to get a good overall picture (no pun intended) of possible solutions. Is there a way to see all the postings again?

  • Jim Haycock Dec 06, 2008

    I am gonna change out the convergence IC's and look at possible bad caps. Thanks so far!!

  • Jim Haycock Dec 06, 2008

    The power light does not blink at all but stays on solid red from power up - no blinks at all

  • Jim Haycock Dec 06, 2008

    I'll repeat the problem: when set is turned on power light comes on red and stays red, no blinking at all. Can hear relay activating and what sounds like degauss. No picture but thick blue + green coloured stripes in middle of screen from top to bottom. Faint sound of audio which cannot be increased in volume. Have checked for dry joints, loose connectors and any burn outs.

  • Jim Haycock Dec 06, 2008

    sorry email notifications of posts were going into my spam folder. Thanks for your patience. Getting the hang of this now, I think.

  • Jim Haycock Dec 06, 2008

    I can solder. My first job leaving college back in '82 was fixing pcbs to component level. Also worked briefly fixing pc monitors. I have taken the power board out and done some resoldering of possible dry joints. I will do another thorough check with the magnifier/light and see if I have missed anything. I cannot see any light coming from the tubes. Have ordered a couple of convergence IC's so I guess it's a matter of replacing those and if not move on to the next thing. Thanks for everyones input so far.

  • Jim Haycock Dec 06, 2008

    This is the most helpful response so far as it confirms my suspicions that my problem could also be in the power, which is why there are no blinking light indicators, just the steady red and also the faint audio. However, if this is a convergence issue am I right in believing the offending IC would most likely be the horizontal amp as the lines I am seeing are vertical? As a further note if I scroll through video inputs the screen is blank except for one selection which I assume is the video 1 which is connected to my source (uverse box). This posting was also presented in the most logical fashion and suggested an approach to follow should the convergence IC solution fail to be correct.

  • Jim Haycock Dec 08, 2008

    I removed the HOT for testing as I know this has a high failure rate. base-emitter tests good but base-collector tests open with diode tester both ways. Tried different ohms ranges but still get open. Is this an anomaly of this type of tranny or is this indicative of a fault?

  • Jim Haycock Dec 08, 2008

    I appreciate the quick response!!!



    I checked the emitter-collector and get an open both ways, which is what I would expect. Do you have any ideas as to what may have caused the failure of the HOT or could it just be that it "died of natural causes". Before I replace it I want to be sure I am not just gonna blow the replacement and have to wait for a further replacement to arrive, not to mention the expense. I have the schematics and the service manual now and have been trying to get my head round how the failure could cause my symptoms but can't explain how I am still getting some audio and some video with the HOT shut down.



    Regards

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6 Answers

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  • Master
  • 6,966 Answers

Hi and welcome to FixYa,

Initially, let's explore some ideas and work from there:

  • to most techs, vertical line problem would be left to right not up/down;
  • if it were the vertical capacitor, then it would be vertical foldover on top. Additionally the capacitor solution could be better viewed at the original source here;
  • if it were the shorted vertical IC, then most units would go to auto-protect mode (blinking light) and the vertical line problem would be thinner than 4 inches;
  • if it were a convergence problem, either the unit will auto protect or three images;
  • "some sound but it is very low and can't be turned up louder" is significant, this indicates that the B+ supply to the audio amp is very low. Depending on the design, this could be indicative of a power supply problem, low secondary B+
Sorry, but have to confirm, which vertical line problem do you have; left right or top/down?
  • if left right - then it would be the vertical section. primary to check would be the B+ to the vertical IC normally coming from the secondary of the FBT through a diode and a limiting fusible resistor;
  • if top down - then horizontal scan/deflection issue.
Should you find this posting informative and points you in the right direction, then pls ACCEPT or do not rate at all. If however you decide to REJECT and/or request additional feedback, then possibly, Benimur's subsequent postings would no longer be viewable.

Repairs should be fairly easy with basic knowledge of electronic circuitry and components and a little soldering. I would expect the IC to be readily available at any electronics part store. Should you be uncomfortable doing a DIY (do-it-yourself), perhaps your best bet would be to seek the services of a qualified professional.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Posted on Dec 06, 2008

  • 1 more comment 
  • Louie  Role
    Louie Role Dec 06, 2008

    Glad to be of some help in clarifying a few things and appreciate much the rating.

    Sorry but I still have to ask, is the 4 inches wide line left to right or up/down?

    A few more you may want to consider:


    • the powersupply's output would be several voltages, among them the standby +5 that supplies the logic circuitry (hence presumably the remote still works and you can access menu, change inputs and other control functions);

    • the main B+ 150 or higher;

    • other voltages such as +12~24 or there abouts used by the audio circuitry;

    • autoprotect in most instances would react/triggered by overvoltage or overcurrent;

    • but what if the condition is the opposite, undervoltage;

    • if the Horizontal section is getting low B+, then the Horz deflection would be low (narrower), the FBT's output would be low, hence the vertical B+ supply would also be low, vertical deflection would also be affected;

    • with the above possibility in mind plus the low audio, that would point back to a power supply issue;

    • since the main B+ and the audio B+ are independent, then it would not be a secondary side problem with the PSU;

    • it could be a primary side issue, perhaps the main capacitor after the bridge diode would require close scrutiny as a start.
    It might be to your advantage to have access to a service manual or at the very least a schematic diagram. Armed with either, you could then perform voltage measurements and compare the readings with known standards.

    Cheers.


  • Louie  Role
    Louie Role Dec 08, 2008

    appreciate the update.

    you are correct. the base to collector should test similarly to the base to emitter. if it does not, then the base to collector is open.

    Incidentally, in cases when the collector to emitter is shorted, this would also indicate a possible fault with the FBT.


  • Louie  Role
    Louie Role Dec 08, 2008

    Hi again,

    I would suspect "due to natural causes". If it were externally induced, then it would be a short all around or the very least collector emitter short and the FBT has to be ring tested (just to be sure).


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  • Master
  • 1,239 Answers

Hi
NUMBER OF FLASHES
POSSIBLE CIRCUIT
1
+140
2
LOW D.C.
3
CONVERGENCE
4
HHS
5
IC4511
6
IC4518

IC4511 is on DG board. Asterisk indicates whole board is to be replaced. In schematic, labeling on IC4511 indicates it does some form of video processing. Manual instructs to add an "S" at end of board part number when ordering. 
* DG-BOARD
TNP2AA126
PIP PROCESSING, SPLIT, SEARCH, FORMATS

Posted on Dec 06, 2008

  • 3 more comments 
  • ABHISHEK.C
    ABHISHEK.C Dec 06, 2008

    IT MAY ALSO BE THE PROBLEM OF CONVERGENCE ICS. It is likely that there are poor solder connections at the convergence ICs. The extra vibration might have been enough to completely break the connections. If you can solder, you can fix this yourself. Look for large black ICs attached to a heat sink . They should be marked STKxxx. If you can solder, try resoldering the pins first. If that fails to resolve the problem, replace the ICs. 

    Please note that there are high voltages that can be dangerous inside the set even with the set unplugged.

  • ABHISHEK.C
    ABHISHEK.C Dec 06, 2008

    Hi AGAIN,

    Most likely a blown Vertical deflection output IC. In most (but not all) Panasonic, the vertical IC is an AN55XX.

    Repairs should be fairly easy with basic knowledge of electronic circuitry and components and a little soldering. I would expect the IC to be readily available at any electronics part store. Should you be uncomfortable doing a DIY, perhaps your best bet would be to seek the services of a qualified professional.

    Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

    Good luck and kind regards.


  • ABHISHEK.C
    ABHISHEK.C Dec 06, 2008



    You might have bad solder joints on the vertical output IC. I do not know where it is located in this set only that it will be mounted on a metal heat sink near three wires that have identical plugs which go to the deflection yokes on each crt tube. Sets vary as to placement of vertical IC. Solder joints should be easily seen if you have good eyes or use a magnifying glass. I do know that the vertical IC will be on the board that has the highvoltage transformer on it (has big red wire). You may have to unplug the board and turn it to the soldered side or just turn the entire chassis up 90 degrees to see the connections. If this is not the problem I don't know how to get into the service mode at this time.Hope this helps





  • ABHISHEK.C
    ABHISHEK.C Dec 06, 2008

    YOU HAVE ANY DOUBT PLEASE CLARIFY IT

  • ABHISHEK.C
    ABHISHEK.C Dec 06, 2008

    There are a few differant things that can cause this problem though. The first problem could be a bad cocus screen divider assembley. This is what takes and adjust your foucus as well as the indivitual screen controls for each color(red, blue, and green). Another problem could be a bad capacitor in the sweep power supply that is supplying the screen voltage or whats called the boast voltage to each picture tube board. The next thing it could be would be a bad coil or resistor in the picture tube filiment circuit also in the sweep power supply. Now I heed caution my friend as non of these repairs should be attempted unless you have the full knowledge of how these circuits work and have the proper test equipment as well as the proper documentaion to repair these beast. Please if in any doubt, call a trained tech to assist you in this repair. Good Luck

    CAN YOU PLEASE RATE IT.....IT WOULD BE HELPFUL TO ME...by the way my mail id is circuit_kptcl_cool@yahoo.co.in

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  • Master
  • 1,952 Answers

1) Is there a pattern to the blinking?
2) Is there sound or nothing?

The blink code indicates that there is no vertical. Open up teh unit and look for the vertical IC. This will be a small flat IC attached to a heatsink with about 9 pins or so. It may be marked LA7838 or something similar. Try resoldering the pons on this first. If that fails to correct the problem, replace the IC.

Posted on Dec 06, 2008

  • 7 more comments 
  • mohammed marika thambi
    mohammed marika thambi Dec 06, 2008

    this could be as simple as a poor connection of a cable or a processing
    problem within the digital pathways. If the unit is not under
    warranty, try opening up the back and reseating all of the cables and
    connectors. Report back here if that does not resolve the problem and
    we'll start looking at the most probable modules

    I would think that this is a bad capacitor in the vertical circuit. As
    the set warms up, the part starts working properly. Check the main
    board for any connections that appear grainy or have rings and resolder
    them. Look for the vertical IC that should be a 9-11 pin flat IC
    attached to a heat sink. It will likely be marked LA7837 or something
    similar. Note the circuit designation on the PC board (IC3xx for
    example). Look for capacitors with the board designation C3xx and
    change them. That should resolve the problem. Note: The 3 in the
    examples previously are just examples. The actual number in your set
    may be different.

  • mohammed marika thambi
    mohammed marika thambi Dec 06, 2008

    Either the connections on the convergence ICs are bad or the ICs
    themselves are defective. Try resoldering the pins first. If that
    fails to resolve the problem, replace the ICs. These are large black
    ICs attached to a heatsink and should be marked STKxxx.

  • mohammed marika thambi
    mohammed marika thambi Dec 06, 2008

    I would first check to be sure that all of the connectors and cables
    inside the set are in tightly. Remove them and re-insert all of them.
    Next, we need to start looking at module replacement.

  • mohammed marika thambi
    mohammed marika thambi Dec 06, 2008

    I would think that this is a bad capacitor in the vertical circuit. As
    the set warms up, the part starts working properly. Check the main
    board for any connections that appear grainy or have rings and resolder
    them. Look for the vertical IC that should be a 9-11 pin flat IC
    attached to a heat sink. It will likely be marked LA7837 or something
    similar. Note the circuit designation on the PC board (IC3xx for
    example). Look for capacitors with the board designation C3xx and
    change them. That should resolve the problem. Note: The 3 in the
    examples previously are just examples. The actual number in your set
    may be different.

  • mohammed marika thambi
    mohammed marika thambi Dec 06, 2008

    I would think that this is a bad capacitor in the vertical circuit. As
    the set warms up, the part starts working properly. Check the main
    board for any connections that appear grainy or have rings and resolder
    them. Look for the vertical IC that should be a 9-11 pin flat IC
    attached to a heat sink. It will likely be marked LA7837 or something
    similar. Note the circuit designation on the PC board (IC3xx for
    example). Look for capacitors with the board designation C3xx and
    change them. That should resolve the problem. Note: The 3 in the
    examples previously are just examples. The actual number in your set
    may be different.

  • mohammed marika thambi
    mohammed marika thambi Dec 06, 2008

    If the speaker was the problem, it would appear at all times. There is
    a problem with the plasma that is effected by the magnetic field of the
    speaker, but that shouldn't be the case. :
    resolder any connections you find that appear grainy or have rings

    This could be as simple as bad connections or it is a semiconductor
    starting to fail. If you know how to solder, look for bad connections
    around the flyback transformer. (Check the rest of the board too if you
    can.


  • mohammed marika thambi
    mohammed marika thambi Dec 06, 2008

    Something as simple as bad connections that change internal resistance
    can cause odd symptoms like this too. I don't have any specific
    causes. Can you solder? Try resoldering any connections on the boards
    that appear to be grainy or have rings. This problem sounds like a
    high voltage change somewhere along the line. It can't be with the
    flyback as that would show up on all tubes. Other techs I've asked
    don't have any specifics either. This one requires a close examination
    while the problem is happening

  • mohammed marika thambi
    mohammed marika thambi Dec 06, 2008

    This is a convergence problem and can be fixed either by resoldering
    the pins on the convergence ICs or replacing them. These are large
    black ICs attached to a heatsink and should be marked STKxxx.

  • mohammed marika thambi
    mohammed marika thambi Dec 06, 2008

    This sounds like a problem within the main power supply. Can you see
    if the tubes are lighting up at all? Based upon a littel research, the
    problem may be with the convergence ICs. These are large black parts
    attached to a heatsink and should be marked STR392-120. If these are
    bad, they will load down the powersupply, preventing the TV from
    turning on. Without measurements inside the set,

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  • Master
  • 4,472 Answers

It sounds like a convergence problem that will require a professional to service. http://www.pstc.panasonic.com/WhereTo/FindServicer.asp?Pass=1
If you follow this link you will be able to locate the nearest authorized service center and also can inquire about an estimate. Please take a moment to accept and rate my solution.
Thanks,
Lee

Posted on Dec 06, 2008

  • Lee A.
    Lee A. Dec 06, 2008

    It could also definitely be a power issue. I am just going off the information I have. Either way it requires professional service.
    Thanks again,
    lee


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  • Master
  • 837 Answers

Thats a convergence problem .. expect to pay $200-450 to fix it

Posted on Dec 06, 2008

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  • Expert
  • 106 Answers

Is this line 4 inches wide from top to bottom?

Posted on Dec 06, 2008

  • tvguy171
    tvguy171 Dec 06, 2008

    If the line is top to bottom, the convergence circuit is probably ok. This particular chassis has a problem with capcacitor C509. You can find it just in front of the yoke plugs. When you locate the flyback, look just between it and the yoke plugs. (The yoke plugs will have 4 wire: red, blue, yellow and green I believe)

  • tvguy171
    tvguy171 Dec 08, 2008

    As I previously stated, check C509 (part number ECWF2474JSR). It may not look badbut it is. It is tied to the collector of the horizontal out. That's why the transistor is going bad. Replace the transistor and the caopacitor and yiour tv will be fixed. If I can be of further assistance, please let me know. Thasnks

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1 Answer

Pt-53wx53 Panasonic Projection TV Turns off


OK< likely one of the new chips are bad or when soldered in you shorted pins at that time----3 blinks is short protection and you are going to find ONE of the light blue 2.2 ohm resistors is open (usually discolored in middle).

Having changed hundreds of chips in this model once in a while you get a new one that is bad---replace both again.

How did you get at them----remove the board or pull the light box?

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If you have sound---the faint band is towards the right of the middle of the screen I know which part is bad it is very common on these sets and about a 3 dollar part.

If you want the answer and complete details rate this solution as very helpful as I do this here for free.


SD TECH

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how many times does the red light flash?
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C509 .47uF Mylar 250Volt. Replace this cap, this should restore power.

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Convergence Problems with red to left of screen.


Replace Both STKs convergence ICs number of part will be on them STK392-110 if this is the number use 180s To order Parts Go To www.electronix.com or Call 1-900-223-3205 These ICs are big black chips.

Dec 14, 2008 | Panasonic PT-53WX53 53" Rear Projection...

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Panasonic PT-53wx53 hdtv


Check the voltage across R517, should read about 12v if not replace C524 which is your AC gournd return and possibly D509 feed diode. I suspect that you get enough voltage to trigger the relay but just before B+ happens the 12v line drops well below the trigger voltage and the relay re-opens.
Bill

Oct 29, 2008 | Panasonic PT-53WX53 53" Rear Projection...

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djbone30, you need two STK392-110 convergence amplifiers.

Sep 25, 2008 | Panasonic PT-53WX53 53" Rear Projection...

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That's a collapse of the vertical deflection. Need the model number to tell you what Ic controls the vertical in that unit - but I can tell you that it would't be all that expensive to repair... It's a common enough problem...
Have a great day!!
Bill

Dec 13, 2006 | Panasonic PT-53WX53 53" Rear Projection...

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