Ok so i have replaced the ic's in my 50h72 and it turned on and everything worked out but the colors still didn't match up so i tried to match them up, well i went to the other room for about 5 mins and i came back and the screen was blank, i figured it turned off or something, so i went and turned it off and turned it back on.... same thing blank screen.... i don't know where to begin and what to look for.... can someone help me please???? thanks in advance
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Re: 50h72 replaces ic's but still don't work
Did you replace the convergence resistors along with the Ics? Also if you replaced the ics with open resistors you have most likely ruined the new ICs. You can get a convergence repair kit for your model at the following link which has the ICs and the resistors for your model, and they provide free tech support and instructions.
Heres the link. http://servicemanuals.vstore.ca/
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The error codes only indicate the convergence circuit is not working.
In this set it is VERY important to check the 1.8 ohm resistors, if even one is open the convergence will look bad.
These sets are not real easy to get at the chips etc, and I learned the hard way a long time ago to check all the resistors, if needed unsolder one end of each of the 1.8 ohm resistors and be sure all are GOOD.
Ur tv have convergence problems,it dead.U must have soldering tools,solders and know how to solders to fix convergence problems.U must replaced 2 STk convergence ICS,and some or all it resistors.Tries websites Tvrepairworld.com,Tvrepairkits.com to buy a convergence kit to repair it ur self.The shop will cost U $300-$350 for parts and labors.
Sounds like your convergence circuit went out. It lines up the red,green and blue picture tubes so the colors are lined up. Usually these TVs all use the same type of IC chips called "STKs" both usually get replaced along with any resistors etc.. around these chips that may have burned up. Depending on who fixes it could be around $300-400 parts and labor.
Replace both convergence ICs they are stk392-110 you will also need at least the six 1.8 ohm 1watt resistors. You can get replacement ICs and resistors at the following link and they provide free installation instructions so you can do the repair yourself.
heres the link. http://servicemanuals.vstore.ca/
ok well both of you have had the same problem i did... to fix the picture problem check the circuit board pd0074 its the yellowish looking one next to the green one which has the ic's on them... ok on the pd0074 board look for fuses f470, f850, and the f851 to see if they are blown the f470 is what turns the tv on and the f850 and f851 are what protect the convergence ic's chances are they are blown.... the sound i don't know how to fix that problem but i would check all the fuses on that board to find out if one more is blown that what i did but the only thing is that i could get the actually fuses for the tv i was told by a tv repairman in my town to just take 2 wires sodder them on to the fuse and take a glass fuse and put electrical tape around them and it worked like a charm... so i hope this helps you.... the most i spent was 30 dollars for the ic's and the fuses all together and i was quoted at 450 to do what i did myself
When I originally removed the board with the convergence IC's I labeled all of the wiring harneses with number tape as I keep a multi number roll on hand as I am a radio broadcast engineer. However there was one set at the very back of the board behind a large heat sink I didn't label because that location was the only place they would fit. When replacing the board after replacing the IC's I missed that particular wiring harness as it didn't have numbers and I didn't see the harness laying among the other wiring. After removing the board to check my soldering work that's when I discovered the harness. I plugged that set in along with the rest, replaced the board, and after cleaning the CRTS's and the mirror the set worked good as new and a much sharper, cleaner picture. Thanks for the information on your forum as it always feels to repair something yourself and save a few hundred bucks to boot.
you will need to replace the two convergence amp ICs they are STK392-110 you can get replacement ICs at the following link and they provide free instalation instructions with pictures.Here's 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.