Sony KP-46WT510: Conv ICs replaced: Still Wonky

My 46-inch Sony Projection TV has a convergence problem. I replaced the convergence ICs using parts directly from Sony and the picture did not clear up once I replaced them. I am attaching a picture.

Anyone have any ideas on what to try next?

Hi Viperpu welcome to the forum. I'm probably dumb, but I don't see the problem? What is wrong with this picture?

i have the same problem. Did you find the solution? Thanks

ic!s do not cause this problem in sony most likely around the flyback transformer theirs either bad solder or cracked solder connections in this area.theirs close to the fly a transistor with eiher a K or T says 130.this means supplier + 130volts dc to the convergances ic.ALSO WITH THIS MODEL TV IS NOTED FOR CONVERGANCE BOARDS ON OR NEAR CRT!S HAVE TO BE RESOLDERED. start here at these points and we go from here.



hobbist tv/appliances 42yrs exp retired also a sony station repair center up state n.y.

P.S

you also need the orginal remote control to get into service tech number @ letter code to access setup menu after repairs maybe your operators manual my have the code do not remember retired several years ago.


hobbist

My solution was to buy a new TV. I never figured out how to fix this one. It is in a landfill now.

unfortunate the display resolution looked good crt s were even.repair was a easy fix.this is what happen to tv business to many people thing they can fix it.a little solder and a converter box would been a lot cheaper.42 inch sony was a rugged tv chassic.solder was a attempt to comply to the new regulations reguarding lead.once you solder good to go for years.you will find the new lcd and plasma will be disappointing they are real junk will not last a year you will see should have fix the sony.

good points, but who cares. The plasma takes up much less room. $250-300 to pay some repair guy (who knows how long it lasts before another repair) or $750 for new one.

Plasma/LCD is the way of the world now. Even if the Sony lasted me a few more years, can't get another projection anyway....so that point is mute.

Trying to do myself was fun....40 dollars to try didn't matter. Thanks for your input.

yes the convergence i.c. do go bad on this model and need to be replaced.I have done hundreds of these.no I have not seen any loose solder connections.you also need to replace the fuses under the i.c. theres three for each i.c check them with a meter.also you have to take the power supply out and replace the +15 volt fuse and the-15 volt fuse it fixes them up all the time its a nice t.v when working.and no there is no 130 volts that go to the convergence i.c.s

Im having a hard time locating the 15 volt fuses. Can you help? I replaced the ic's and checked all of the fuses on the D board and the check ok. I checked all of the fuses I could find on the power board. I must be missing something. Thanks, John

it was mention editioral above yours says you have to remove power board.location i do not know exactly.look under board under ic. ????

there is three yellow fuses in front of the i.c.when looking at the d board while in the set.right in back of the red green and blue yoke plugs.may be hard to get your meter in there with out hitting the heat sink.I check the fuses from the bottom side when I have the board out.there is also two black fuses on the g board or power supply that send the plus and minus to the convergence circuit.5 amp if I remember and also a cap that the top blows off

thanks for the help lagacyj. this would be a good peace to make a sticky and put in diy tips or under electronics, and saved as archive. i have several editiorals like this my self again thanks.

Regarding the solder by the flyback, etc.... I just came across this posting. I have replaced all suspect PICO fuses, made sure all resistors are working within spec, and replaced the IC's. I have pretty much the EXACT same picture as the poster does above. I even de-soldered the IC's and re-soldered them again to be sure my job was good. I can move them in convergence mode, but never enough to line everything up. Can you give me some additional guidance on what I need to check now? (FYI, I do get the +/- 22v on the IC pins, can't remember which ones off the top of my head.) I would REALLY like to get this working. At least I'm not the only one with this problem! I thought initially it must just have been bad replacement IC's, but I think I'm wrong then. Thanks!!

I know that sony change their solder some years back to comply with world health concerns.also so this solder decays over time.water soluable??.check the same on convergance boards and around fly also.power supply may be low.trippler, fly etc you know the routine check the b-plus standard procedure.i presonally do not like pico setup whats wrong with the standard fuses.sizes and shapes.course i am from the old days went common sence was the day is stead of cheap and stupid.you can not fix stupid.if i was young and had time i always dreamed of building a tv system that is relable and last 20 yrs made in america and used standard america parts.like it was. i have a motorola quasar built form a kit form school built in 1978.i change the some power supply parts and added transformers in critcal circuits still working in use everyday so it can be done.

hobbist 42yrs tv/appliances repair and tv station tech i built them also.

make sure you use the stk 392-560 thats the only i.c. that will work in that model.if the two fuses on the power supply are good and the three fuses for each I.C. are good.you need to check with a meter.99.9% this will always fix the t.v. try hitting the flash focus on the front panal to see if it finishes its procedure.if it does not finish its procedure then you still have something wrong with the convergence circuit.if you took the d board out make sure you put all the yoke plugs back were they belong.all the red must go to the red and green to the green and so on.even I have put them back in the wrong position and got the same results.if this has a customer convergence menu which I think it does and you can move the red and the blue then the convergence circuit is working and you may have one yoke plug in the wrong place.theres 3 up front theres 3on the side and there 3in the back they all need to go to the right place or the convergence will be placed in the wrong position.this was one of sonys better t.v. and I have fixed hundreds of them with no problem just retrace your steps good luck.

Perhaps one of the IC's I replaced in it is DOA. I may try to order another pair and replace them, yet again...... Did get a Mitsubishi tube TV repaired yesterday though, so at least I feel better there.. .... Thanks for the input!

i know what the problem is

you need to check the picos that power the ics

they are on the power board on the left

5 amp picos

one or both are blown

Even though I'm getting the +/-22V at the IC's themselves?

when you power on the tv and leave on for a few minutes do the heat sinks get hot???

I haven't powered up that TV here in some time.. (Haven't got rid of it yet, but didn't get motived to re-visit fixing it either!) I do know they get warm, indicating they are receiving power. Is that good enough? If you have experience with these TV's, I may give it another go! Thank you very much for the response!

if the stk are getting warm then that means they are getting power and the picos on the power board are fine

all i can say is make sure all the picos near the stk are good and that all the resisotr4s near the stk are good and and you have new stk


can you move the blue red and green in all directions??

Yes, I can get them all to move. However, even in the service menu, I can't get all the grids to move far enough to line up. It gets to a point where a lot of them do line up in the center, but not all the way to the edge. ??

red and blue is bad??

you may have a bad A board

seems like your convergence is working but you cant move it enough to align

Where is the A board? If "something" on it is bad, would it normally be fuse-related, or something else? Yes, I can move all colors in all directions. So perhaps you might have something there?

well i ad a tv same model where the red and green were fine but the blue was so ouf whcakc i couldnt move it far enough to adjust

i tried adjsuting the geometry of the screen to get it closer but it didnt work.....i then found out that it was prob a bad A board that is repsonsible for the convergence wavelength or it could have been a abd V board on the blue tube

i gave up and tossed the tv out and bought a new onw

thats all i know

Thats honestly what I'm leaning toward. I ended up fixing a 32" Tube TV for my son to watch in the basement, and am getting ready to setup a projector in the other unused side. I think it may be time for this guy to be kicked to the curb. Thanks for your input!

How did you solder the STK392-560? Did you remove the D board by unhookinhg the FLYBACK wire?

Yeah, removed the two big red wires (I believe that is the wire for the flyback right?) The biggest one, you have to push it in, and turn counterclockwise. A real PITA to get off IMO.