Question about Zenith B32A24Z 32" TV

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PICTURE COMES ON THEN BLOOMS FADES

THE PICTURE COMES ON OKAY ,THEN FADES OUT OF FOCUS , BLOOMS. COULD THAT BE A POWER BOARD FAILURE?

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The problem is onthe power supply,
one of the semi- conductor is heating up

Posted on Apr 24, 2009

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The color on my Advent TV fades in and out of the picture, and goes to black and white Why


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Shutdown after video comes up the green power light stays on but the set will not shut down while changing channels. (philips 27 pt543s) ic702 eeprom and ic7200 control/signal processor has been...


Re:"shutdown after video comes up the green power light stays on but the set will not shut down while changing channels."

Hi.

I do not think this has anything to do with logic circuits and video processing. When you stay on one channel the horizontal and vertical alignment circuit works more than if you change channels all the time.
This is just a guess, but have a look at convergence ICs. when you keep changing channels the power amp ICs (or transistors) go on and off, if one of them is defective it will overheat and shut down.
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I have a Ds25204. It comes on fine but the picture is out of focus. also I tryed the audio/ video inlets and they do not seem to work. Any ideas? Thanks for your help!


a part inside ur tv called as "picture tube base" which connects picture tube to circuit board is problem sum..
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Mar 24, 2010 | Sanyo DS24205 24" TV

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Picture fades in after 2-3 minutes


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Jul 25, 2009 | Televison & Video

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Picture slowly fades,then comes back and repeats


Stacy,

Sounds to me like there is bad solder somewhere on the filament supply circuit. Do you know what a cold solder joint looks like? It is a solder joint that is not making a good mechanical or electrical connection. When you lose that connection the filament inside the tube slowly stops heating the electron guns and the picture will fade away. When the connection comes back the video will come back.

Might be worth it to take the back off and check out the little board that is connected to the end of the tube. The problem is either there or on the power supply.

Shouldn't be a problem for a repair tech. I would not spend very much money though.

May 22, 2009 | Fisher PC-25S80 25" TV

2 Answers

Focus


its the convergence problem in your power supply board

please check out this links

for convergence board ics reparing it your self

http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm

and for convergence settings

http://www.somelifeblog.com/2007/06/sony-projection-tv-red-line-repair.html


also check out for the convergence bulb if that goes dim the screen becomes out of focus

thanks.



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1 Answer

Power light blinks and no picture


No picture - screen is empty. Sound is ok
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No picture and sound, only a high pitch sound at switch on
Remove horizontal transistor and measure the resistance across any two pins. This value should be no less than 200ohms
Picture fades away few seconds after start-up till no picture. Sometimes no picture at all. Sometimes picture OK for longer. Sound unaffected.
Faulty joints on CRT pcb. Cracked solder joints at tube socket connections on CRT circuit board. Caused variable supply to CRT heaters. Resolder all socket pins to pcb.

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1 Answer

Flashing in and out picture


This is crt base failure due to corrosion. That is why to wont get clear picture initially when you switched on in long interval period. Change crt base problem solved.

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