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Re: Repairing convergence IC's
Scottk, They are black and rectangle, they are about 2" by 4" insize, they will start with the letters STK, they will be mounted standing up on a metal heat sink. If you need any more info, and I highly recomend you do this, is go to http://servicemanuals.net and download the service manual. Make sure you enter the correct model number and not leave any numbers out. The reason is that you will be able to locate the proper parts and then have the correct instructions for alighnment. But I warn you, if you have had no solid state repair experience, you could be in for a big surprise, and find out it is harder then you thought as also if you have little or no experience soldering and unsoldering you should really let a pro assist you in this repair. These sets are very unforgiving, incase you make a mistake. But if you get the schematic and need assistance, I will be more then happy to do so. Good Luck
PS Get the service manual!!
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You will need two STK392-120 Convergence ICs and about 4 6.8 ohm 1watt resistors. You can get replacement ICs and resistors at the following link and they provide free instalation instructions with pictures so you can do the job yourself. Here is the link. http://servicemanuals.vstore.ca/
Good Day, harri1234;
Sounds like a convergence problem. Convergence Output IC Failure Corrective Action: Replace the defective Convergence Output IC Part Number 23905094 (STK392-110) using the revised “T” version IC Part Number 23135090 (STK392-110T). When Convergence Output failure is detected, it’s recommended that both IC’s be changed to the “T” type IC version. Good Luck, Big Irish.
Can you check that location number again The parts list doesnt list a capacitor with that location number. Is the item a resistor or a capacitor ? Let me know the other site I work at has full service manuals with part numbers and specs in them. I will be able to tell you the specs on your part
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
Sorry no pic, but if you look from back of set on deflection board(board with HV transfromer)big part with about 4 wires coming out going to your picture tubes. Looking close to leftside of board the last IC with heatsink shield standing up has a small 7 pin ic if looking on it you should see TDA8177 or something to that affect. This is the verticle IC. Since you have found the IC's (convergence) then the only thing left is to look for open fuses like 1300, 2004, 1900 etc and see if open. Concerning cost if you buy from www.bluestaronline.com these part are inexpensive so it wouldn't hurt to buy all. Rule of thumb, if set has color problem then Convergence IC, if no problem just went out one day while playing fine then Vertical, then the alternative if no sound the audio area, which is not common for this set. Hope this helps!
The convergence IC's and fuses are not your problem. If the Sony projection set has a bad convergence IC and/or a blown fuse or fuses in the convergence circuit, the set will continue playing but the colors will not line up correctly. If the set will not turn on at all, and has no lights at all on the front of the set, the problem is in your main power supply. If the set tries turning on and then flashes the timer LED on the front of the set, count the number of times the LED flashes, as that is the code for why the set is notworking. I have found that the most common cause of the set not starting is a shorted flyback transformer.
It looks to me like the green is sagging down at the top, and this means that one of your convergence IC's has stopped working. Instead of replacing the whole module, locate the convergence IC (Samsung typically uses the STK392-040 IC's) that handles Green Vertical (GV) and replace it. Sometimes there is a fuse next to the IC that looks like a small resistor that opens up too. If you do not have experience changing convergence than have a qualified tech handle it for you.
replace ic chips pt# stk392-120 or stk392- 150 and there are 12 resistors located near ic clips pt# 6r8 ( color code blue - gray - gold - gold ) board location no#s 3149 thu 3160 if you look close you may find two resistors discolored as i found on my convergence circut board , also use heat sink compound on new ic chips , take your time to mark all wire connectors going to board from tv , also use .022 dia gage rosin -core solder and a 15- 25 watt soldering iron you may have to adjust the red - blue convergence afterwards my tv set is 3 yrs old also ( thanks holbert )
The convergence IC's are black in color with white lettering on them and will start with STK. These IC's will be standing up and be about 2" X3" in diameter. These IC's will also be mounted up against a large metal device called a heat sink. good Luck