I did a few searches and i came to the conclusion that it may be the convergence board in the unit that has failed. Im just not sure how i can go about ordering a new one or even finding the failing component and just replacing that.

So this is how it all began, the tv was on last night for about 6 hrs and then it was off for about 8 hrs and when i turned it on this morning a few seconds later it turned off and the power button started blinking. I left it for a bit and unplugged it. Tv restarted again and came on as normal except that the red convergence line is now way off to the left. I tried the digital convergence option and it would not move the line L or R but it moves fine up and down.

Does anyone have any suggestions on how i should approach this? Im just not sure what went wrong with this, would getting a new entire board fix the issue or is it hidden somewhere else. I removed the entire board in the back and the circuitry is very rough and could easily be tackled with a soldering iron if the damaged circuit was found, i need to find the unit responsible for lateral convergence of red colours, blue works in V and H alignment.

any input would be greatly appreciated.

Thanks,
Ciprian

Locate the convergence IC's. Two large black IC's mounted on large silver heatsinks. Each IC has 18 to 24 pins, they will say something like STK392-120. These will need to be replaced. Also check for large resistors in nearby area for burnage.

Hammer

This one uses the STK392-110. You have likely lost one channel of one chip or have some bad solder joints. These should be upgraded to the STK392-150 or the STK394-160 and a number of bad or marginal solder joints likely need to be adressed. As hammerdwn noted, there may be damaged resistors, though in this model we rarely find this. Be sure to use original Sanyo chips from a reputable supplier such as B&D, TriTronics (but do not use their TT generics), Acme, or Electroinica. Bed sure to clean up the heat sinks and properly apply fresh heat sink compound.

So are these chips on that green board that says digital convergence? Or are they around it.

Will it be very difficult to replace the chips? Or are they relatively large. I just assembled all of the parts, so i will remove them all again, take some pics once i get over 5 posts and confirm the part numbers. I hope its loose solder since i just moved the tv downstairs a few days ago. I guess the trip down the stairs etc wasnt the greatest idea for this old unit.

Thank you for all of your help guys, its very much appreciated. I will keep the thread updated with pics etc for future reference. Plus my little game room is closed down without the TV LOL.... I will get on top of this asap to get it fixed.

This one uses the STK392-110. You have likely lost one channel of one chip or have some bad solder joints. These should be upgraded to the STK392-150 or the STK394-160 and a number of bad or marginal solder joints likely need to be adressed. As hammerdwn noted, there may be damaged resistors, though in this model we rarely find this. Be sure to use original Sanyo chips from a reputable supplier such as B&D, TriTronics (but do not use their TT generics), Acme, or Electroinica. Bed sure to clean up the heat sinks and properly apply fresh heat sink compound.

I found them, took the unit apart today and they are the stk-392-110.

Should i try anything before i go ahead and order the chips. Should i replace both or just the horizontal one (they are labeled H and V).

They also have another number, like the horizontal one has 7B03 in the top right corner, i need that number too when ordering the ones right?

How can i find the bad resistors and bad solder joints, all of the flux seems to be present on the terminals of the chips and board in genera. THere are some rough soldering points that look to be done by hand but im guessing thats normal since this unit was never opened and i bought it new 9 yrs ago.

I will look into ordering both chips, but if i can just replace the H one since its giving me issues, i would rather do just that to save time. Ill order both in case the other breaks down later.

Thanks again guys

Ciprian

I cant seem to find anyone but b&d's web site... and the 150s are out of stock. Any other place that carries them?? and are they both identical (the vertical and horizontal chips).

I just need to order 2x STK392-150 (or 160)???

Thanks

JUst wanted to post some pics.... i think i can do it past 5 posts

http://i32.photobucket.com/albums/d27/linuxglobal/DSC05239.jpg

http://i32.photobucket.com/albums/d27/linuxglobal/DSC05243.jpg

http://i32.photobucket.com/albums/d27/linuxglobal/DSC05244.jpg

http://i32.photobucket.com/albums/d27/linuxglobal/DSC05245.jpg

Try Acme Electroincs in Orlando or TriTronics in Miami (or Abingdon, MD). The options for the upgraded chips are the STK392-150 or the STK394-160. The latter is probably only available as a Hitachi part number. Replace both and redo all the solder joints that are bad in the circuit.

will the 150 and 160 be better? I just dont want to damage the unit if i install the wrong part.

How do i know which joints are bad in the circuit? The brown spots? I know how to solder LOL.. just a little unsure on how to go about finding the bad solder joints, they look good to me. I just have to be careful when i install the new chips.

I just replaced the chips and it still looks the same. Maybe i have some bad solder joints?? how can i spot these. The display is the exact same as before so im running out of ideas.

Is there a way of troubleshooting the bad joints.

The tv comes on now and then turns off and the red led at the front flashes.

Please help asap. Thanks

update: I swapped in the old chip for the horizontal convergence and now it doesnt reset anymore. In the above pic the red line was right before the c, now its at the O. Moved to the right about 1 inch by itself.

is there some manual override feature that i dont know about?

Please let me know,
Ciprian

any other tips guys????

When you go into adjustment mode are you able the move the point(s) both vertically & horizontally? It's normal that after replacing the IC's you need to re-adjust the convergence. The new chips will not have the exact charactoristics as the old. Do the static (single point) first then go into SM (multipoint) to finish it.

Hammer

I have the exact same problem with the exact same model. Can you tell me what happened with yours?
Thanks.