Question about Panasonic PT-51HX41 51" Rear Projection Television

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Convergence/power off I was given a throw-away PT-51HX41E. When I got it home I found it would power up, set for 10 seconds, image would suddenly loose green component, then set would shut off. I took a compressor and blew dust out from around green crt driver board. As a result the TV would now stay powered up(?), but the green convergence could not be dialed in. Research on the internet led me to conclude it must be bad STK392-110's. I pulled the board and noticed a couple of smoked resistors adjacent to the convergence IC's. I replaced the resistors with new and reinstalled the board, leaving the IC's in just to be sure it wasn't a resistor problem instead of an IC problem. When I powered up the set it now shuts off within three seconds and will not power back unless the power cord is unplugged and replugged. Can bad convergence IC's cause a power shut down like this, or is it more likely that I screwed something else up during the resistor transplant?

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  • Lance Hanson Aug 22, 2006

    I replaced the bad STK ($20.00), replenished the thermal compound on the functioning STK (hate to replace a part that's still working) and swapped out the cooked resistors ($2.50). The TV now works like brand new and I have extra parts for the next time the STK IC's fry.
    For what it's worth, I noticed the thermal compound (i.e. heatsink paste) was chalky and dry under the fried STK. My guess is this was what precipitated the STK going out.

  • Lance Hanson Aug 22, 2006

    I replaced the bad STK ($20.00), replenished the thermal compound on the functioning STK (hate to replace a part that's still working) and swapped out the cooked resistors ($2.50). The TV now works like brand new and I have extra parts for the next time the STK IC's fry.
    For what it's worth, I noticed the thermal compound (i.e. heatsink paste) was chalky and dry under the fried STK. My guess is this was what precipitated the STK going out.

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No sundog this model has the potenthal to be a nice tv when you saw the burn't resisters that was your clue to change the stk's now that you have fixed the res problem the bad stk is telling the set to shut down replace stk,s i ALWAYS change both (buy the way in the future those are hi watt res THEY SMOKED FOR A REASON maybe you thought they were installed in the 70"s ha ha. but they smoked because the stk's one or more are bad. good luck doc

Posted on Aug 18, 2006

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I have a Panasonic PT-51HX41E, and it will not power on.


does the power light blink? If so thats an error code let me know the number of blinks and I will assist you with the issue.

Feb 06, 2013 | Televison & Video

2 Answers

I have this same problem with the PT51HX41E but in the convergence menu the green and red are allowed to move. but the blue on the right side of the screen is not allowed to move and it looks like its...


My first guess would be a bad convergence amplifier - this is common, although usually all three of the amplifiers in the integrated circuit die at the same time, which throws off at least two colors and creates a "bow-tie" effect. I surmise you have half of a bow-tie in blue only.

If you could look at the blue output waveforms with an oscilloscope, you would see right away if this is the problem (flat-line instead of sawtooth wave). It is possible that both of the blue convergence amplifiers are working, but one output is not getting to the blue deflection yoke.

Don't mess with the convergence anymore until you get this taken care of. Changing the convergence now will only make it harder to get it back to where it should be once the circuit is fixed.

Sep 22, 2010 | Panasonic PT-51HX41 51" Rear Projection...

2 Answers

Bad color then no power on 51'' panasonic cinemavision


Check the power light for blink code--usually if this model shuts down the power light will blink in a sequence--3 blinks a pause and 3 blinks is short protection--usually means a convergence circuit problem.

Let me know what you find--I am here to help.

if this helped you rate this solution as I do this here for free.

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Dec 17, 2009 | Panasonic PT-51HX41 51" Rear Projection...

1 Answer

Panasonic pt-51hx41e


This is a convergence output IC problem. convergence board (main Board) would have to be removed - remove and replace 2 STK IC's and check the surrounding resistors. Shops usually charge between $200-$300

Sep 26, 2009 | JVC AV-48WP74 48" Rear Projection...

1 Answer

Panasonic PT-51HX41E Convergence Problem


Hello pzemenides,

I posted this in an eariler solution and there are numerous referencesto this type of problem on fixya.com, however it fits in this case, sohere it is:

This denotes a convergence problem. Believe it ornot it would be cheaper for you to replace the two convergenceamplifiers and the biasing resistors. You would not actually bereplacing the convergence board since these devices are usually locatedon the deflection board in most cases. However in answer to yourquestion, the boards are easily removed, depending on your level ofpatience (lots of cables to move around), I would also advise you toeither mark down all of the connection you will remove, or take picturesof the board and its connectors. If you choose to just replace theAmplifiers and the biasing resistors there is a lot of information onthis site on how to do so: This will get you started:

1) Unplug the TV and then get a schematic of the TV I use http://www.servicemanuals.net or http://www.manualsparadise.com
2) On the schematic locate the STK392-xxx series IC packs (or whatever Convergence ICs your set is using) (usually attached to a large heat sink)
3) determine if the STK392s are 110, 120 or 150.
4) if the STK392-xxx's are 110s replace with 110s (forget that upgrade stuff it is a hit or miss game that I don't believe you want to get into), if they are 120s replace with 120s and so on.
5)Nowto replace the STKs: remove the module from the TV and unsolder theoldSTKs along with the bias resistors, and replace them with the newones(be sure to apply heat sink paste to the STKs when attaching them to the heatsink)
6) make sure there are no short circuits form your soldering job.
7) Reinstall the module and then turn on the TV.
8) do manual adjustment and the auto-convergence test and then things should be back to normal.


I hope this helps

Shuttle83

http://www.electron-age-technologies-llc.com

Feb 26, 2009 | JVC AV-48WP74 48" Rear Projection...

1 Answer

Panasonic PT 51HX41E flickering colors


ok her is a good test for u, bring up the pip on screen and see if the picture is the same as the main picture ok.now if at is it sounds like to me that u have a bad pip board that is causeing your problem u can bypass the pip u just need to jump the video in to the video out and sync out and in and remove the pip most of time i have found that the small caps go back on the board and u lose snyc and that is y your picture goes black and white with blinking color in the background. now the stk392-150 is a better chip then what u had in it but convergence problem has nothing to do with color snyc. i hope this will hp u marty

Sep 18, 2008 | Panasonic PT-51HX41 51" Rear Projection...

2 Answers

Convergence


u could try changing the convergence ic if that is not it then u have to go in to the back door of the eprom to set but i think pansonice u need a service remote to get in. i hope this will hp marty

Jul 17, 2008 | Panasonic PT-51HX41 51" Rear Projection...

3 Answers

PANASONIC PT-51HX41E


The convergence amps have most likely failed. That unit takes two STK392-110 (Sanyo) amps. For more reliability I'd have them changed using an STK392-150. They have a greater amperage and higher heat tolerance.
It's clearly a job that you want a qualified shop to do.. Call around and get some off-the-cuff estimates on what they charge to change out the convergence amps and tell them that you would prefer they use the 150's instead of the 110's.. They'll probably wonder how qualified you are. :)
Bill

Nov 13, 2007 | Panasonic PT-51HX41 51" Rear Projection...

1 Answer

Panasonic pt-51hx41e tv screen codes


I found this on the net let me know if this works for you Once you are in service moce on a Panasonic you must continue through all steps to the end to exit. It starts with the B parameters, then C, S, and M, then you can exit by pressing power and action ON THR RECIEVER for 2 seconds. The TV will turn off and come back on on ch3 with sound. BTW, you advance thru the menus by pressing power on the remote.

Oct 05, 2007 | Panasonic PT-51HX41 51" Rear Projection...

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