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My RCA D52W20 will not power up. When the set is first plugged in, the power on LED stays on for a few seconds and then goes out. It does NOT do this three times. After a few minutes, you can push the power on button and the led stays on for a few seconds and then goes out. I replaced CP150, CP114 and CP120. CP150 tested good on a capacitor tester. The other two failed the leakage test. The symptoms are still the same.

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  • RCA Master
  • 5,807 Answers

Hi,

These time , since you have changed the capacitors, check the horizontal

output transistor .

Check for resistance first, it might be shorted.

These transistor have three ( 3 ) pins namely the base , collector and

the emitter.


check for the collector ( center pin ) and the emitter pin ( rightmost pin)

the base and emitter is usually shorted ( if connected on the board due

to the HDT connected )


Assuming that horizontal output transistor is replaced and still not

working, you might need to measure the B+. ( can be the voltage

at the collector of it.)



If the voltage reading is more than 140V, horizontal oscillator is

block.


If the voltage reading is 75 V , the flyback is partially shorted, take

down the flyback part number and have it replaced.


Try also resoldering the pins of the flyback might help.

If you have a bright light and a magnifying glass then you can/ might

see more cold solder joints.


Might as well check again the polarity of your installed capacitor

just in case.



The B+ can be from the chopper secondary output after the positive

side of the diode. It is mounted on the aluminum heatsink.

The horizontal output transistor is also mounted on an aluminum

transistor.


Posted on Dec 11, 2009

  • Rommel Cana
    Rommel Cana Dec 11, 2009

    these might be similar to yours




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