Question about Konka K2786U 27" TV

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Chassis kp2771uy, wont power up

I am sure konka made this misakai 32 inch tv. I could send you schematics there not helping me. Tv wont power up. Relay is not picking up. I have 170 volts at bridge cant figure out what turns on the relay, half the components shown on the print are not on the board. I have basic electronics and weak blue print reading skills but I am determined to fix it. Any advice.

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Re: chassis kp2771uy, wont power up

If you have a switching power supply then you may have a problem with it. Also maybe a short on its load. The relay may be used only to de-magnetize the pic tube. If the set is also controlled by a micro processor then the stand -by voltage could be missing. There are so many possibilities that it's difficult to tell exactly what is happening. These are only a few things that may be wrong. Stargazer

Posted on Jun 02, 2007

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search these site you can find more info for your chassis

that was 2 years ago

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1 Answer

Tv no power

It's really not quite enough to go on and could be any of the following; Bad FBT (flyback transformer), R216 in the ABL circuit. (Auto blanking limiter); D404 in the Hv circuit or the HOT (horizontal output transistor) at Q404... I'd start there first and if those test okay then I will dig out the schematics and send you the service manual.
Do you get any relay click when you press power button? That's a TAC0116 chassis and prone to any or all of the above.
Hope this helps!

William Rayburn, CET
Premium Technologies
PO Box 442
Long Beach, WA. 98631

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it might be due to

  • plug or socket loose where tv is connected.
  • loose connection in switch.
  • some connector loose in power supply
  •  switching transistor in power supply &horizontal section loose or wire open
  • some capacitor loose in oscilltor section in power supply.
  • if you are not tech. person please take help.
  • hope this will help
  • good luck

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