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PostPosted: Sun Aug 05, 2007 6:39 pm    Post subject:

Found an open resistor (1ohm 1/4w) in vertical output. The resistor connected to a diode and a capacitor (33uf, 250v). Replaced the resistor and it was burned out again after turned on the TV. Any suggestion?
PostPosted: Wed Jun 27, 2007 6:02 am    Post subject:

BTW the P/N of the pcb where flyback located is PW9533-1.
PostPosted: Wed Jun 27, 2007 6:00 am    Post subject:

Thanks cory. I found 2 caps (33uF 200V); and 1 cap (33uf 250v) which connects with a diode. But none of them seems defect. (I used a multi-meter to check them on board).
PostPosted: Tue Jun 26, 2007 12:16 pm    Post subject:

there should be a capacitor near flyback rated at least 250 volts.follow connector back from crt onto main pcb.there will be a diode and cap right off flyback secondary.change cap.
PostPosted: Tue Jun 26, 2007 5:50 am    Post subject:

The voltage is around 60-70 V. Trying to figure out the defect component now...
PostPosted: Mon Jun 25, 2007 5:59 am    Post subject:

low voltage in cathods driver (180~200) may cause this problume(check fbt out line to dc circuit diode cap , ....)
if problume not stay in stable mode (variable screen voltage) change fbt
bad video driver circuit too may made this problume(zener diods,driver ic ...)
PostPosted: Mon Jun 25, 2007 12:46 am    Post subject:

check 200 volt line going to crt neck pcb. if low find capacitor, probably near flyback.
PostPosted: Sun Jun 24, 2007 5:38 pm    Post subject: re

Thanks, both of you. Let me describe the problem a little more in details.
The screen is bright, the picture is pale but stable, and the white retrace lines are full of the screen. I had tried to turn down the screen control voltage, the retrace lines were gone, but the screen and the picture became very dark. I have already replaced a cap on CRT control board which is attaced to the end of the CRT.
PostPosted: Thu Jun 21, 2007 8:14 am    Post subject:

there can be other faulty comp causing symptom- before condemning tube, I would check electros, res, djs etc. If tube is suspect, there are ways to rejuvenate/ fix problem- but must know what doing- I know from hard won experience & making equipment needed how to do- but really, do you think anyone asking such a basic thing could do it?!- I think not!!. Confused
PostPosted: Wed Jun 20, 2007 10:56 pm    Post subject:

Try turning down the screen control on the flyback, if it's still there, bad CRT.

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