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Hitachi cdh model 21gfs12 drops the source to 0 volts

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What's up friends. I got this tv that is driving me crazy haha. Change the font ic. And control by lifting all of the resistance and diodes and change opto. But when plugging in. + B. It goes up to 14v. Nothing more and progressively falls to or volts. Check secondary output as diodes and filters and I can not find fault with someone d A hand with this issue? P.S. Change horizontal and vertical output tb


  • 2 hours ago

    Avatar de luis tartaglia

    What reasons did you have to change the source regulator?

  • 2 hours ago

    Avatar de luis tartaglia

    UNLOCK the flyback pin where the + by arrives and measures voltages without giving PW. Of all the source outputs. See if the ST LED turns on. Comment all

  • 2 hours ago

    Avatar de jonny3000

    Hello friend sorry for the delay in health problems ... but well, come back to this TV. Unlink the fly. Load focus. And I don't have any voltage at the output of the choper. Secondary side Change the source regulator to another one that was on a used board and the TV started very well
    I realized that the ic they sold me was failed. Lonque can cause relying on a response but well finally the TV came out working. thanks for your help

3 Proposed Solutions

SOLUTION ACCEPTED
Until stabilizing the voltage of + B isolate or release the flyback to the source of its load and place a filament bulb of a power equal to or less than the power of the TV as a provisional load.

With the focus installed;
Indicate what voltage you get in + B in both STAND BY and the ON command.
  • 2 hours ago

    Avatar de jonny3000

    Well friends, I commented on the steps I took. First by the question of Luis. Change the source regulator because the TV came dead without a standby light and the source in 0 volts. So first change it. Then thoroughly check the primary source components by lifting one end of diodes and resistance finding nothing abnormal. Then mount everything. Then I passed. Desolder el.pin of more B del.fly and the fault continues even with fly disconnected. And focus on the source continues with the same fault

  • 2 hours ago

    Avatar de Javier Chavez C

    Indicate the voltages obtained on each of the pins of the source regulator IC

  • 2 hours ago

    Avatar de Javier Chavez C

    Do not forget to leave a LIKE as a sign of appreciation for the support received.

    Finally close the post valuing as a SOLUTION in the proposal that influenced their determinations

This is smigo. They sell poor quality parts.
I'm glad it will repair.