Question about Hitachi 65SWX20B 65" Rear Projection Television

1 Answer

I have the typical convergence issues. My blue is way off. I order new ICs and installed them, but still have the same issue. The ICs I pulled are (1) STK392-110 & (1) STK-150. I replace both with STK392-110. Is that my problem? The is also one resistor near rear IC marked RK55. It appears to have been a hot but not burnt. Slight brownish discoloration in the middle. Do I need to replace it also? Thanks, Dan

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  • 3 more comments 
  • d_mulder May 26, 2011

    Ok, I understand better performance, but shouldn't it work to some extent? I do not have a schematic so I don't know the value of the resistor. How can I get the specs? Could the resistor alone cause the convergence to still be off?

    Thanks,
    Dan

  • d_mulder May 26, 2011

    Should I buy the $104.00 ICs?

  • d_mulder May 26, 2011

    The STK392-110 is what I used. You just said they were no good.

  • d_mulder May 26, 2011

    I paid $60.00 for a kit from TVRepairKits.com. (2) STK392-110 & 6 resistors.

  • d_mulder May 26, 2011

    I don't know if my reply went through or not.
    I paid $60.00 for a kit from tvrepairkits.com. They are suppose to be good STK392-110.

    I guess I have to go buy another TV.

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Hi,
Please use STK392-150 ICs as its better than STK392-110 in performance, also check both ICs are getting +Vcc and -Vcc (approx +20V, -20V) to work properly and yes, replace RK55 with same value/ rating mentioned on resistor/ related schematics.
Usually low price STK ICs are not good, please go for medium or high price IC of same number.
Hope these info will help.
Thanks.

Posted on May 26, 2011

  • 3 more comments 
  • Shahid Electronics
    Shahid Electronics May 26, 2011

    RK55 is METAL OX. 150OHM 2W resistor.
    Low price STK IC is sub par chip that has manufacturing problem so it wont work at all.
    Click PartStore.com link to view SRK392-150 chip price, one is for $13 and other is $104 but part number is same? its quality issue.
    Same thing for STK392-110 four different prices for same number chip?
    Hope this will help.

  • Shahid Electronics
    Shahid Electronics May 26, 2011

    Correction: SRK392-150 is wrong word, STK392-150 is correct one.

  • Shahid Electronics
    Shahid Electronics May 26, 2011

    I wont recommend to buy that costly chip because tv is an old model, however, STK392-110 for $37 each is better choice.

  • Shahid Electronics
    Shahid Electronics May 26, 2011

    It was not mentioned that where from both STK were bought and its proven fact that STK392-150 is better than STK392-110
    Since STK392-150 is very much costly so keeping tv in view I suggested to buy medium price ICs to solve the issue, it was also suggested to measure/ check supply volts to ICs
    If Vcc are fine then ask tvrepairkit.com to provide good quality ICs because convergence output chips failure is most common problem of rear projection tv.

  • Shahid Electronics
    Shahid Electronics May 26, 2011

    I got your follow up question emails, I just answered that.

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