Question about Toshiba 50H72 50" Rear Projection Television

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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 different??? Also, when doing the SELF CHECK, a couple of area's are RED like these: BUS CONT: NG QH401 & BLOCK :MAIN SUB (sub is in RED color)...What does this mean? Thanks very much.

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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.


Posted on Jan 03, 2011

  • jcsaxx Jan 10, 2011

    Thank you. Where can I order these 1.8ohm 1w resistors? Also, I see that some other people are using 2.2 ohm, but I want to order what the service manual calls for. What do you think?

  • SD Tech
    SD Tech Jan 11, 2011

    value is critical here, a 2.2 might work but could cause adjustment problems, these resistors precisely control voltage to the chips, as far as parts try calling my favorite dealer, SUBURBAN ELECTRONICS, they have a 800 number and also a online catalog.

    When pressed and did not have correct resistor I have used 1.8 one half watt flame proof and never had a problem, the original ones are one watt and metal oxide in nature.

    Andrews Electronics in LA, the world's largest OEM dealer will have them and they also have a 800 number and take phone orders.

    For best results get the good ones.




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