Question about Toshiba 50H72 50" Rear Projection Television

1 Answer

50h72 replaces ic's but still don't work

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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  • James Krych Oct 27, 2008

    would it hurt if i replace them with bigger ics like 180's cause i did replace them with 180's instead of 110's

  • James Krych Oct 27, 2008

    ok well i checked some fuses and the f470, f850, and the f851 are blown, which resistors should i check if you know the numbers? if you do that would help me out a lot thanks

  • James Krych Oct 27, 2008

    also i was wondering where could i get those fuses that are blown?

  • James Krych Oct 28, 2008

    never mind i found the numbers and tested them all and they all seem to be working but i found out that f470, f850, and the f851 fuses are blown

  • James Krych Oct 30, 2008

    okay so now i need to replace those fuses but when i try to find those fuses i cant find them the only thing i get is pico fuses are they the same thing?

  • James Krych Oct 30, 2008

    okay thank you so much for all your help

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  • Toshiba Master
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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/

Posted on Oct 25, 2008

  • 1 more comment 
  • Sonny Berry
    Sonny Berry Oct 27, 2008

    The STK392-180 will usually interchange freely where the STK392-110 are installed as they are the same IC except the 180s are higher wattage so therefore run cooler. I would think that the trouble is in the resistors as an open resistor from the old ICs can destroy new ICs if the set is operated with the resistor still blown.

  • Sonny Berry
    Sonny Berry Oct 28, 2008

    Fuse F470 protects the 120V line to the SVM its a 2.0 amp 125 axial fuse. Fuse F850 protects the +16V for the convergence and Fuse F851 protects the -16V for the convergence. Both F850 and F851 are 5.0 amp 125V axial fuses.

  • Sonny Berry
    Sonny Berry Oct 30, 2008

    No picos are different. radio shack will have those fuses just bring the old ones with you.

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1 Answer

Toshiba 50H72, replaced IC's, but colors still not lined up correctly. Did not replace resistors. Manual states to use 1 watt, 1.8 ohm resistors, are these correct or do I need to use something...


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.

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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.

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Apr 26, 2009 | Toshiba 50H72 50" Rear Projection...

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heres the link.
http://servicemanuals.vstore.ca/

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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

Oct 31, 2008 | Toshiba 50H72 50" Rear Projection...

1 Answer

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Oct 26, 2008 | Toshiba 50H72 50" Rear Projection...

1 Answer

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Oct 11, 2008 | Toshiba 50H72 50" Rear Projection...

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http://servicemanuals.vstore.ca/

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http://servicemanuals.vstore.ca/

Jun 22, 2008 | Toshiba 50H72 50" Rear Projection...

1 Answer

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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.

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