I need to replace the ic on the red convergence circuit.Problem is I don't know where to look on the board. Also, are there any related capacitors I should replace as preventive maintenance or so it won't repeat burning out another ic? Are schematics available free online?
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Thats a convergence failure. often you can replace the two Ics and associated resistors to repair the issue yourself instead of replacing the convergence board. But you can get the ICs and resistors from www.tvrepairworld.com which includes free tech support for help installing the parts. They also have circuit boards for most models available if you choose to replace the board instead of trying to repair it.
If the colors are not matching and shapes have a red, green or blue halos, then the problem is convergence rather than the color wheel. The problem is usually fixed replacing the two convergence ICs in the alignment circuit. The replacement involves de-soldering of two old ICs and soldering new ones in places. More components in convergence board (resistors, fuses etc.) may need to be tested and replaced. The repair ad the soldering job require training and experience and must be done by a technician.
You need to remove the convergence Board and repalace the convergence IC's and and replace electrolytic caps and check for resistors that have changed in value. You can getb the parts at www.mcmelectronics.com com or just purchase a new board at www.partstore.com .
Often convergence issues do not require the entire board to be replaced. You can resolve it by replacing the convergence ICs. The part in question is STK392-110. You will need two of them and they cost around 10$ each. But replacing them is a pretty complicated procedure and I would not suggest it to someone without prior experience. A service manual should get you started in the right direction if you are planning to do this yourself. https://www.completeservicemanuals.com/toshiba/crt-projection-television/57h81-service-manual/prod_1128.html PS: Disconnect from the power supply before you start the repair. Also read the legend, the hv circuits are denoted by a special symbol, so you will know what you shouldn't touch.
You may also need to replace the nearby resistors that may have popped the IC in the first place. Read the service manual for further details.
Try resoldering the pins on the ICs first. If that fails to resolve the problem, change the IC responsible for RED. You should be able to determine that from the service manual. In that area you should also see either fuses or low valued resistors that feed the STKs. Check those as well.
Hmmm... I dont know where to find those CTR Circuit boards I'll post my general post for you about what I know it has links to the manual and some other sites it may help.
how bad is it burned, did some chips go or just the copper circuit board tracers. you can use circuit board wire and solder it from point to point, I had somewhat of the same problem with my IC board, I had a bad portion of the board where I had to build a new copper routing with circuit wire, the copper burned off when the resistor failed, you may need to do a little Frankenstein work on your board as a last resort...remember use a low 15 watt soldering pencil, use leaded solder, and USE flux! however with all my work, I got it running but the IC board is still not running perfect. if you decide you cant fix the TV I would love to buy your IC convergence board from you. GOOD LUCK! hope I helped... GENERAL POST WITH LINKS BELOW..... 51MP392H/17 Actually I have this TV and you need 2 Convergence IC's STK392-120's (120's and 150's will work) of course order 2 of the same type I'm using replacement 150's they allow for a little higher heat and were cheaper ALSO you need to replace the 12 resistors with 6.8 ohm metal film resistors, make sure they are metal film! don’t skimp out here I did and then they blew and fried my IC's and I had to replace everything again!
What you need: (2) STK392-120 OR STK392-150 IC chips (12) 6.8 Ohm Metal Film resistors set of star screw drivers 15 watt pencil solder pencil, DO NOT use a high watt iron you will fry the surface mounted item. good leaded solder, and flux
BTW if you don’t plan on trying this and are going to throw out the TV, I still need a IC convergence board for a 51MP392H/17 TV I'm fixing, I'm willing to pay S/H and buy your IC board that’s not been tampered with. [email protected]
As long as you can solder you should be okay, however i would suggest getting your ICs at the following link because they provide free instalation instructions with pictures on how to remove and replace the Convergence ICs. heres the link. http://servicemanuals.vstore.ca/
The convergence Ics need replaced. In Toshiba, resistors and sometimes a coil needs replaced as well.
The convergence/deflection PCB is available, but, the cost of that board is higher than having a servicer come to your home and repair the unit to component level.
If you are not familar with this circuit, then call a servicer. Have them replace both ICs not just one. Make sure they are repairing to component level and not replacing the board.
Hope this helps.