I was workin on fixxin my convergence chips and ran into a problem when soldering.. is the a ground plane in the board? I also think i messed the board up, because i was tryin to get the chip soldered i seem to have a bridge between the the 2 pins where i think the ground plane is and i cant fix it. I could really use some help on this..thanks in advance!!!
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voltages to IC's There's a shielded module near convergence IC's It could be bad too. Check voltages to It.. I had simular problem /replaced IC's did not fix..Replaced module & did convergence.. TV was fine so try this 1st k
You would need to locate the chip, have some type of desoldering equipment, un solder all the pins, remove the chip, put some heat sink compound on the new chip, line up all the legs and install them through the board and solder each pin to the pc board.
You still have bad grounds on the ICs. Or maybe the solder has fused another pin. If not bad grounds on the ICs you have missed them elsewhere...Really concentrate and look for these bad grounds and check your caps with a cap check. And power resistors too!!!!!
check this out I have the same problem check your solder spot make sure the solder points are not touching one another, that could be one of the reason is doing this or just to make sure you can desolder the stk chips clean the holes where the pins go trough the board and power the tv with board and if the tv start fine if could be bad stk chips be very careful when desoldering or soldering good luck about another is not worth it they cost too much around 350-450
The convergence IC or in a sense ,amplifiers and the resistor are output resistors... if they are burning up the current going through them is spiking too high... TO me this is an indication that the "convegence yokes" are shorted. These are coils around the tubes that control convergence. I would suspect maybe that these are shorted to ground somehow. This is my first guess for this problem
It sounds as though you have a convergence problem. This problem is normally a convergence chip ( there are two (2) of them on the convergence board ) If you intend to correct the problem yourself, always remember to practice precautions by unplugging the tv before removing or servicing the set. To change these chips, carefully follow these tips . I do suggest you change both chips as I have found that when one goes bad, the other one is on the way out also.
Remove the bottom back cover by using the proper screw driver or nut driver. usally a 1/4 inch nut driver or a phillips screw driver is all that's necessary.
When you have the boards exposed to view, notice on the left center of the convergence board ( the convergence board had 2 large ( large being 3X4 inches) chips next to each other. These chips normally are marked with number like STK 3020, STK 3050 etc.( I don't know the exact number on this perticlar set but they are all about the same ) They usally have about 15 pins ( wires ) coming from them. May be 12 or 18 but normally 15. This board needs to be removed to change the chips, so remove any screws that mount the board and disconnect each wire connected to the board. ( NOTE : I normally mark each wire with some kind of a color code with permanite marker pen as to know exactly where to reconnect the wire to eliminate any mistakes ) With a soldering iron ( normally one of about 25-40 watts works well ) and some de-soldering wick ( can be purchased at most electronic parts stores or Radio Shack ), remove the chips. Clean all the connections after taking the chips loose from the heat sink ( the heat sink is the aluminum plate the chip is screwed to ). Apply an ample amount of heat sink compound ( silicon grease it is sometimes called) ( can also be purchased at Electronic Parts Store or Radio Shack ) to the back of the heat sink and reinstall the new chips ( make sure the new chips are of exact numbers as the old), being extra careful not to bend the pins. Solder the pins being extra careful not to jump solder across any connections.( if you happen to apply too much solder and do in fact jump lead across the connections, simply use the de-soldering wick and remove any excess solder ). Reinstall all the wires and screws to the board ( double check for mistakes ) and turn the set on, checking for the correct convergence. You'lle need to do a quick convergence with the magic focus switch after warming the set up for appr. 20 minutes. Reinstall the back of the set. The set should work fine. I do hope this helped Ed NC Electronic Mills, Wyoming
There are kits available online, which include the chips and the soldering iron too.......Just a word of caution, convergence chip replaced is more difficult on Toshiba #1 the chips face other boards that must be remove first. the main one is the convergence generator (which the sheild is soldered in placed) Also the signal board (which is what everythings mounted to is very fragile)..............Good Luck
What is the vert problem? Usually, a break in the foil indicates separation of ground planes, but they will converge to a single point somewhere. If there is solder that ties the planes together, this may suggest that someone has modified the board. Again, what is the problem with the TV?