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TV Philips 21PT1381/71R..no vertical deflection(black screen)

Philips 21PT1381/71Rno vertical deflection(black screen)..with audio.replaced: jungle IC(TDA8361) and Vertical IC(TDA3653B)--same trouble.-pin7(sandcastle) of TDA3653B has 3.5v(vertical IC in Protection mode because flyback generator didnt work.-Pin8= 0v(it must be 5v)==vertical feedback=4v(Jungle IC pin 38)--must be at least 2.5v

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gopakumarg43
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SOURCE: How to trouble the vertical ic in aiwa TV-14GT33 but i replace it,

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Posted on Feb 10, 2016

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1 Answer

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You're right. Check and replace all the electrolytic capacitors at the vertical deflection output stage. There will be 5 or 6 of them. Replace all at one time.

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Hi:
There could of been a connection in the vertical circuit that has come loose during transport, another thing is i hope did not use a dolly underneath to load and unload this unit as they tend to crack the main board in and around the deflection circuit. A straight line means there is no vertical deflection for the CRT, if you look inside the vertical output wires going to the yoke on the neck are usually yellow and white check this connector to see if it just poped loose while transporting.

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If there's an audio,,it might be the defective Vertical IC...but check first if there's 24v-26vdc supply coming from FBT going to Vcc of Vertical IC.

If there's no Audio,and only white horizontal line in the screen,check the Vertical out of Jungle IC.

Good luck!

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1 Answer

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Audio without video is usally a vertical or horizontal deflection problem with the DPTV chassis and Mag 1 chassis which is what you have. You may need a new deflection Large signal board. If you would like a link to one of those boards let me know.

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The problem you are having is a vertical deflection problem. The screen is being compressed to a thin white line. It's probably a defective vertical output module or transistor. This part is not too expensive. Less likely would be a vertical deflection coil, which would be more expensive because its usually glued to the picture tube and harder to replace. You'll need to take your set to service center to have it serviced.
Please let me know if I can be of further assistance to you.
Good Luck!

- Jim

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