Question about Panasonic PT-43LC14 43" Rear Projection HDTV

11 Answers

PT43LC14 problems after replacing bulb and installing ballast kit

I have a PT43LC14 I am working on currently. I have replaced a burned out bulb with an OSRAM from ebay. No picture or reponse from the TV. Just the blinking red light. I ordered a ballast repair kit and installed all but the transistor (there are three and i have no clue which if any are bad). I pulgged it in and turned it on. It clicked once and the bulb lit up for about one second and then shut itself off again. The TV has a constant blinking red light on the power button and one every few seconds on the Temp LED. What now? AARRRRGGGHHHH.

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  • 9 more comments 
  • Axle80
    Axle80 Dec 30, 2008

    Jissa,

    huh?

  • Axle80
    Axle80 Dec 30, 2008

    Let me try to repost the specific problem. The Lamp is new and the ballast has been rebuilt. I have no way of knowing if the ballast is working right other than to pulg it in and hope for the best. The tv turns on and takes two to three seconds to ignite the lamp. It flickers on and stays lit for about 1.5 seconds. Something clicks on what seems to be the PSB and the lamp shuts off. The power LED flashes green and a few seconds later the lamp flickers back on for the same 1.5 ish seconds then flickers off. That same occurance repeats itself and then the TV power light flashes red and the temp indicator led flashes red every five or so seconds. Help!

  • Axle80
    Axle80 Dec 31, 2008

    Its not the lamp door switch. Thats a different LED flash than what I have and if I bypass it with a jumper it doesn't remedy my problem.

  • Axle80
    Axle80 Jan 02, 2009

    Is they flyback on the beige power supply board? The green main doesn't have anything larger on it than quarter sized chips. Thanks for your help.

  • Axle80
    Axle80 Jan 02, 2009

    This isn't a CRT TV. Its an LCD rear projection projection (bulb not rayguns). Let me get even more specific. When first plugged in, the TV power button led shows solid red. When pushed, the tv delays 3 secs while flashing the green led on the power button. The ballast clicks rapidly and faintly and the bulb fires for about a second. Then something near the psb clicks and simultaneously the bulb shuts off. About two seconds later the lamp flickers on again for about a second and then shuts off, no coresponding click. During the second light up period the display comes up and shows the channel number but then the screen goes dark again when the bulb dies (of course). The power button then flashes red and for every five flashes the temp led flashes red once. The TV will stay in this state indeffinitly until the power button is pressed again and then whole scenario repeats itself exactly. When the ballast is disconnected from the lamp and the TV is powered on, the ballast attempts four times to ignite the lamp. I can tell by the faint rapid clicking from the ballast. I don't really know what to check for on the thermal fuses. There seems to be a large normal looking one that has a no resistance continuity, and a smaller red one about the size of a pico fuse, but encapsulated in clear plastic. The red innards are visible and seem to be separated but have no burn marks or otherwise, there is no continuity through it. But if unhooked the TV gives off a totally different LED Error code on start up. The fans are all spining correctly and aren't dirty. Oh boy, has this got me stumped. I appreciate any help.

  • Axle80
    Axle80 Jan 03, 2009

    All solder joints from my repairs have been verified true.

  • Axle80
    Axle80 Jan 03, 2009

    I am an electronics repair student and am near the top of my class, (near, thats why I need help!) This TV isn't worth taking in to see a panasonic authorized blah blah. I'd like to fix it myself. If anyone can pin point which if any board is actually bad, I have access to replacement parts.

  • Axle80
    Axle80 Jan 08, 2009

    Aftermarket (OSRAM) bulb. I don't have a service manual.

  • Axle80
    Axle80 Jan 09, 2009

    I have ordered another OEM bulb, I will replace and repost with the result.

  • Axle80
    Axle80 Jan 13, 2009

    Ok, I bought an OEM bulb and an OSRAM showed up in the mail today. Looks exactly like the one installed now. Has the exact same reaction and reaction times as the other. I contacted the seller and was told that it is OEM.... huh... well, according to the internet, which is always 100% reliable I know... The OSRAM bulb is what the panasonic factory repair people are using at this point. If anyone knows this to be false and can point out where to get an actual panasonic bulb I'd be happy to place another order.

    So, new bulb didn't solve the problem. Now what?

  • Axle80
    Axle80 Jan 16, 2009

    Due to the location and necessary wires, testing the board while hot is not an option. There isn't a voltage label nor test points....lousy old panasonic ****...so I've removed the board and set out blindly looking for problems. I don't have a reliable cap tester so, armed with my multimeter I found one large resistor with no continuity. Of course radio shack doesn't stock 27k 2w resistors so I had to order it. I will install it and look for anything else that seems out of whack. Replacing the PSB as a whole is going to cost $350 so thats not really a viable option either. I am about out of patience with this hunk of junk. Maybe I'll keep it around to smack it with a sledge hammer when I have bad days....

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11 Answers

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  • Master
  • 535 Answers

Chak out the all the capcitor is has damged or resistor burned out its will happen due to the over gian problem see the capacitor & the resistor of ckt bord

Posted on Jan 13, 2009

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Okay, let's boil down this issue to its salient points.
1. It's not the lamp. You've replaced the lamp, and problem persists.
2. It's (probably) not the ballast. The fact that you hear a click after the lamp sparks, which shuts down the unit, but you can restart later, indicates that the ballast is (probably) fine.
3. Your soldering joints have tested true.

So, based on those observations, I would suggest the problem lies in the power supply chain, between the ballast and the power supply itself. The "click" you hear just before it goes dark suggests that a safety circuit has tripped. That suggests an over-voltage from the power supply. Solution: check to see that the lamp socket is getting 100 watts. Read the power supply label, and check that the output from the power supply is correct. Between those two, trace the circuit and look for any leaking capacitors, toasted resistors, anything that might disrupt the operation of that circuit. Obviously, be careful when dealing with power, and take all appropriate safety precautions.
Please report back with what you've found, and perhaps we can explore other options.

Posted on Jan 08, 2009

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The aftermaket bulb is non supportive in panasonic hdtv models.you will just have to get the orignal panasonic bulb and replace it then only it will support and the unit will function properly with out any error. u can get the orignal from here http://www.digitaltv-weblog.com/50226711/panasonic_rear_projection_hdtv_replacement_lamp.php

Posted on Jan 08, 2009

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  • Master
  • 1,952 Answers

If you have not changed the lamp recently, that might be the cheaper option to try first. A bad lamp can also cause shutdown. The ballast would be the next likely suspect.
With a new ballast, I don't think that this is something that can be diagnosed remotely. The lamp and ballast are the most common failure parts. You may want to invest in a detailed estimate. With that in hand, we can then walk you throught the actual repair.

Posted on Jan 08, 2009

  • mohammed marika thambi
    mohammed marika thambi Jan 08, 2009

    Try turning up the screen control on the flyback just a bit. The
    flyback is the part that has the red wire coming out of the top. Turn
    the top control clockwise just a bit and update this with the results.
    If that "fixes" the problem, you have bought yourself time to replace
    the set as the picture tube is failing.

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  • Panasonic Master
  • 4,806 Answers

Hi there
It sounds like the main IC board that needs looking at if you are a electronics student use a voltage meter on the components to find the faulty transistor.
The blinking red light indicates that one of the lamps are faulty or not installed properly, there could be a fault with the lamp you bought from ebay, its recommended that you only by lamps that the manufacturer endorses.

Good luck

Posted on Jan 08, 2009

  • Lee Hodgson
    Lee Hodgson Jan 09, 2009

    hey again Axel
    when you have got your new lamp, before you put it in check the continuity of the connection of the lamp socket to make sure there is no problem with that too

    Good luck mate


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  • Panasonic Master
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Did you fail to clean the lens and reset? The proper method is to first clean then replace components using rubber gloves or non conductive wrist bracelet.

Posted on Jan 08, 2009

  • Dan Webster
    Dan Webster Jan 08, 2009

    Did you fail to clean the lens and reset? The proper method is to first clean then replace components using rubber gloves or non conductive wrist bracelet.

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  • Master
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Hi, Let me know, does replacement bulb (lamp) is panasonic original or aftermarket, compatible thing. Do you have related service manual in hand?

Posted on Jan 03, 2009

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  • Shahid Electronics
    Shahid Electronics Jan 08, 2009

    Aftermarket bulb is cause of problem and does not match with current consumption of specific current rating so causing error in TV start-up.

    I would recommend to use original Panasonic bulb and TV will work as normal.



  • Shahid Electronics
    Shahid Electronics Jan 09, 2009

    Thats great, will wait your update.

  • Shahid Electronics
    Shahid Electronics Jan 13, 2009

    You can get origianl lamp from Panasonic Parts Store for PT43LC14 and Part Store is also reliable source of parts.

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  • Master
  • 1,239 Answers

Hi You may have at least a blown fuse. However you may also have other damage to your power supply. This often happens due to the voltage spike caused by the power coming back on suddenly. You can check to see if the fuse is blown, however once you change the fuse and if this does not take care of the problem, I would suggest that if you do not have a background in electronics, that you have a qualified technician take a look at your TV set.

Posted on Jan 02, 2009

  • ABHISHEK.C
    ABHISHEK.C Jan 02, 2009

    y main board. blinking led on logic main in normal operation. when replacing y main always good idea to replace y upper and lowe buffer boards as they complete a circuit and sometimes replacing one without other could cause additional failure on remaining boards.










    A 5 blink error indicates a bad lamp driver. However a lamp may possibly cause this too. I suggest putting a new lamp in if you have one just to verify the lamp is not the problem. If it still fails with a new lamp then the lamp driver is the problem. This part should be replaced by a Sony authorized servicer.

  • ABHISHEK.C
    ABHISHEK.C Jan 02, 2009

    sorry yours panasonic tv ....lamp driver is the problem. This part should be replaced by a panasonic authorized servicer.

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  • Master
  • 5,158 Answers

Almost sounds like a short circuit... you have mentioned replacing some parts.... go back and examine ALL the solders for cold joints and bridging in the solder (accidentally shorting two circuits together).

cold joints are fairly easy to locate but be careful you don't get an electrical shock.... use a plastic item to tap spots on the circuit board... if you find a joint not soldered properly... reheat it abit

Robert

Posted on Jan 02, 2009

  • Roberta Smith
    Roberta Smith Jan 13, 2009

    that click you hear is likely a power protection device... you mentioned the ballast being rebuilt... did you do the work or have someone else do it... i would check for cold solder joints and or solder bridges



    Robert

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  • 1,011 Answers

Sir,

might have a power supply problem. The manual shows red light flashing five times is the bulb burnt problem. so u must replace the bulb.

thanks
good luck

Posted on Jan 02, 2009

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  • Contributor
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This sounds like the flyback regulater is burnt out on the main circut board!

Posted on Jan 02, 2009

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