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Panasonic tcp42g10; stopped working, screen is blank, but LED on front is flashing repeatedly 12 times. need service manual with schematics and help fixing the problem

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  • tom_liu_ct Mar 27, 2011

    1. I've taken off the back metal cover of the TV and have identified the power supply module. See attachment. But I can't find a damaged capacitor. Please identify which capacitor you mentioned and provide procedures to diagnose further.

    2. I've also requested the service manual with the schematic diagrams. Please also provide.

    Thanks,

    Tom Liu

  • tom_liu_ct Mar 30, 2011

    Hi JD,

    Thanks for the preliminary pointers. I did not see the connectors P6, P7 and P25 but I did see P2, P11 and P35 (and P9 for the AC) The voltage outputs were not printed on the PC board also. If you have the voltage readings, please provide. From your provided link to service manual, there are 4 publication relating to service. Wonder if I need the parts change notice and the supplemental service manual if I decided to do it myself. I was in electronics related work before & I switched completely to software now except parts and module replacement. Again thanks for the safety reminder which is indeed the first order of business.

    Thanks,

    Tom Liu

  • tom_liu_ct Mar 31, 2011

    Hi JD,

    Sorry for unable to respond quicker. I've a full time job and I'm responding this from work just before I drive home which takes about an hour or so.

    Last night I was trying to find my old VOM (volt-ohm meter from the old day; not the digital type of today). Finally I found it but the battery (some odd voltage -battery 22.5V from the old day and I don't think I can get a new one now) was almost dead. Since I need to measure voltage only (not resistance), may be this should be OK. Worst come worst, I buy a new digital meter if it is not too expensive.

    Anyway I was going to ask you something. I did find the connectors you mentioned. They are the ones you annotated last time in your response; the wires cover the symbols and I did not look at them because my intuition tell me they are in general not the heavy duty 5V -15V power lines. I found them now (though can't find the voltages printed on the PC board), please let me know which pins carry the power to be measured, and is pin one the ground? If you know the test pins that will be great, as to measure the pins from the edge connectors will not be that easy.

    Thanks,

    TL






  • tom_liu_ct Apr 04, 2011

    Dear JD,

    Finally got the time to measure the voltage with my old VOM. Here are the readings:
    P7 pin 5: 5V, Pin 6: 0V. P6 Pin 7, 8 and 9 all 0V. P25 Pin 9: 5V and Pin 11: 0 V.

    Regards,

    TL

  • tom_liu_ct Apr 04, 2011

    Hi JD,

    When I plugged in the AC outlet, I heard the relay clicked. I turned on the TV (either manually or using the remote control, both worked), the display was still blank but the LED at the bottom blinked 12 times repeatedly as I stated originally. At the point (without unplugging the AC power coed) I measured the readings that I sent you earlier. So I don't know this is in standby mode, shutdown mode or (most likely) SOS detect mode. Looking at eBay side found the power supply cost about $100 to $175. If it does not work, they usually will not take it back or the best case is 20% restocking charge + my shipping cost.

    Regards,

    TL

  • tom_liu_ct Apr 10, 2011

    Hi JD,

    Remeasure again with patience. This time I found there was 15 V on PIN 7, 8 and 9 after the first relay click on power plugging in. Then I heard the second click some few seconds later and saw the voltage indicator fell to 0 Volt. I did the same measurement after unplugging the two connectors to the speakers. The behavior was the same. Please advise.


    Regards,

    Tom Liu

  • tom_liu_ct Apr 10, 2011

    HI JD,

    Not sure I was login'ed when I sent out the response a few minutes ago as I can't find it here. If so please ignore this one

    I remeasured the voltages at P6 pin 7, 8 and 9 again. I found 15 V on them when I first plug in the power and heard a relay click. After a few minutes, I heard a second click and the power dropped to 0. I then unplugged the 2 speaker edge connectors on A board and did the same measurements. It behaviored the same. Please advise.

    Regards,

    TL

  • tom_liu_ct Apr 11, 2011

    JD,

    I remeasured again per your suggestion and found I've 15 V at P6 PIN 7, 8, 9 on power first turned on (i.e. after the first relay click). Then they dropped to 0 a few sec. later after the second relay click. Please advise. (This is my repeated submit as I was not able to see my last response, similar to this one, in the web page. If this is a repeat, please ignore.

    Regards,

    TL

  • tom_liu_ct Apr 11, 2011

    Hi JD,

    Do not have those connectors except A1 which goes to one of the speaker terminals.

    Regards,

    Tom Liu

  • tom_liu_ct Apr 13, 2011

    Hi JD,

    I've difficulty uploading via your link (Scribd). So I tried to attach them here but can't find the button like last time. Let me know how can I send you 3 small pictures ( less than 140k each) There are 6 edge connectors that were used (saw 2 are not used). The 3 at the front were mostly from the power supply and the 3 small connectors are for speakers and the LED/remote circuit I guess.

  • tom_liu_ct Apr 13, 2011

    Just uploaded with public share access; link is http://photobucket.com/panasonicTV.

  • tom_liu_ct Apr 16, 2011

    Ordered the board from Shopjimmy. Waiting for their delivery. Hope it works.

  • tom_liu_ct Apr 20, 2011

    Hi JD,

    I received the A board last night and replaced with it right away. Bad news, behave exactly the same. Any idea? Do you have a schematics ?

    Regards,

    TL

  • tom_liu_ct Apr 22, 2011

    Hi JD,

    Not sure u got my response earlier. I bought the A board, replaced it and the symptom is the same. Have 15 V before the second relay click but drops to zero after the second click; exactly the same with my original A board. Any idea of what to proceed now? Thanks.

  • tom_liu_ct Apr 23, 2011

    At this point after spending around $150.00, any advice to fix this problem?

    Regards,

    Tom Liu

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Http://www.youtube.com/watch?v=Y7b_nTaZYcU



http://www.user-guides.co.uk/download/panasonic/panasoniclcd/panasonic-lcd-tv-error-codes.html

Posted on Apr 23, 2011

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Hi Tom,
Your error codes indicated fault in power supply feeding the main board. You have to check the output voltages of cable connectors P6,P7, and P25 prior from the shutdown to have an accurate reading. You're reference voltages are printed in the board itself. Once you encountered missing/dropped of output voltages in any of that pin-out, you may disconnect this connectors and start measuring the supply again. If the supply normalize after the connectors have been disconnected the fault is in the main board but if the supply remain the same(nothing has changed) the fault is in the power supply board. I know you will be fixing the unit yourself because you are requesting for the service manual. This fault needs to have an skills of an expert because you are going to check for voltages and also the parts for defect. Safety precaution is a must also when working in the power supply section. You have to prepare some necessary tools and test instrument.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Posted on Mar 30, 2011

  • 11 more comments 
  • Jdvillanueva
    Jdvillanueva Mar 30, 2011

    I have a copy of service manual of panasonic model no. TH-42PX80U,
    TH-50PX80U, TH-42PZ80U, TH-46PZ80U and your power supply board and main board is almost the same so I'm assuming that the connectors also has same labelled. But anyway you may check the output voltages in the picture below.





    If you can get the output voltages in the pin-out of the 3 connectors, let me know the reading...

  • Jdvillanueva
    Jdvillanueva Mar 31, 2011

    Note : if you are going to check the voltages with the connectors disconnected from the main board, make sure it will not take more than 30 sec...

  • Jdvillanueva
    Jdvillanueva Apr 01, 2011

    the supplied copy of service manual(not exactly your model but same Panasonic power supply and main board module) I have does not have a schematic to pinpoint the exact test point. This is only supplied with a block diagram. But anyway, you may get this reading by inserting the black test prod in the common ground(heat sink is the one) permanently while navigating the red test prod in the pin-out of P6 and P7 connectors. check the voltages prior from shutdown to have an accurate reading. 15vdc is in the P6 and while 5vdc is in the P7 based on my copy.

  • Jdvillanueva
    Jdvillanueva Apr 01, 2011

    record the reading of the output voltages in the said connectors, let me know what you've got...

  • Jdvillanueva
    Jdvillanueva Apr 04, 2011

    Hi again TL, the P Board(power supply) was already faulty since it was missing an output voltages most especially on the P6 connector which is feeding the main board and derived the output voltages distributed to other board. Click this LINK for the replacement.



    Good luck.



    JDvillanueva

  • Jdvillanueva
    Jdvillanueva Apr 04, 2011

    I'm assuming that you've got the reading prior from shutdown...

  • Jdvillanueva
    Jdvillanueva Apr 04, 2011

    Yes, you're right that is an SOS detect and not a standby mode, this was because you're missing the main output voltage which is 15vdc upon start-up, I've strongly advice you to measure the output voltage prior from shutdown because if you've late 0vdc will be measured. But since I've pretty sure that you've done it the right way, your P Board caused this SOS detect fault...Double check the reading as much as possible...

  • Jdvillanueva
    Jdvillanueva Apr 04, 2011

    You have a clicking from the relay because your 5vdc was present...

  • Jdvillanueva
    Jdvillanueva Apr 04, 2011

    based on my service manual 12blinks was a Sound SOS detect which is in the main board circuitry. However you've missing the output voltages derived from the P6 connector, I've based on your reading and that what the real fault came from. Be patient double check the P6 connector output voltages, placed your test prod on that connector prior from powering on the unit.

  • Jdvillanueva
    Jdvillanueva Apr 11, 2011

    sorry for the late reply, I've been in off this few days...



    This is how tricky working in the power supply, most will mislead if didn't got a proper testing in the output voltage. My first impression when you haven't got a reading in the testpoint, the error code was due to a defective power supply since the output derive from that board was missing.



    Now its turn out to be the main board(A board) was faulty but we have to confirmed it first.

    Please check if you can see this connector in the main board

    1. A20 connector

    2. A52 connector

    3. A51 connector

    4. A1 connector



    this will be our next test point to pinpoint where the fault came from....



    measure it again prior from shutdown...




  • Jdvillanueva
    Jdvillanueva Apr 12, 2011

    can you take a picture of your main board and upload it here then give me the link also.

    Take one main picture and other picture showing the connectors. Thanks...

  • Jdvillanueva
    Jdvillanueva Apr 13, 2011
  • Jdvillanueva
    Jdvillanueva Apr 13, 2011

    Hi again TL,



    I've already saw the picture and now confirmed that the problem is in the main board. This is actually a Sound SOS detect (12 blinks). In my first advice I've strongly advice you to work in the power supply to check the regulation of this board. Since now we've confirmed that the main 15vdc was present, your power supply board is not the issue and not the caused of the error code which is derived from that supply voltage(15vdc). I would advice you to replace the entire board(main board) rather than repair the Sound circuitry because it uses some special tools and test instruments and also familiarity in its circuitry. Also it will cost you almost the same with a new board.



    Here's the link for the replacement.



    Good luck!

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Remove the back and check , or replace the bad electrolytic caps on the power supply and that will fix your problem.

Posted on Mar 24, 2011

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