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Equipment Repairs => CRT TV forum => Topic started by: egm on July 07, 2009,04:26:34

Title: sharp 21V-J70M yellow picture w/ sound then goes out in seconds
Post by: egm on July 07, 2009,04:26:34

to all,
 
Pls help me, when I turn on my sharp tv there is a yellow display with sound but it goes blue dark and cant see any more the image and also the sound gone. I have already replace TA8403 have also check Hor. driver and Hor. out but its ok. I will really appreciate your help thanks..

egm

Title: Re: sharp 21V-J70M yellow picture w/ sound then goes out in seconds
Post by: Turnip on July 08, 2009,12:10:20

Hi there,

   Don't recognise the model, but yellow pic might indicate a tube fault. Sharp often used Philips tubes which tend to go cathode/grid (A1) short on one or other colour gun. Suggest giving the tube neck a gentle whack before it cuts to standby - might prove something.

   Good luck - Chris.

Title: Re: sharp 21V-J70M yellow picture w/ sound then goes out in seconds
Post by: egm on July 12, 2009,04:39:00

Thanks chris,

I'll try it that way when I have time I'm in night shift sched this days I don't got much time yet..

rgrds,

ed

Title: Re: sharp 21V-J70M yellow picture w/ sound then goes out in seconds
Post by: egm on July 14, 2009,07:00:34

hi

I have tried your advice but I got no response from the tube, I have tested some capacitors and diode but it seems all good what have I noticed that when it warms it turns to blue dark as well as the sound disappear. Thanks


ed

 

Title: Re: sharp 21V-J70M yellow picture w/ sound then goes out in seconds
Post by: Turnip on July 14, 2009,13:27:04

Hi Ed,

    Just gave general advice as I couldn't relate the model number to a main board that I could recognise. Some additional info might be useful.

    Chris.

Title: Re: sharp 21V-J70M yellow picture w/ sound then goes out in seconds
Post by: amin on July 17, 2009,13:35:53

dear friend
this occurs in Philps n the faulty is the tube,you better have a test done before going forward in changing parts.get a crt of same quality n plug the chassis to it u can seethe result.i have just change a crt of philips with the same symptoms.best of luck
amin

Title: Re: sharp 21V-J70M yellow picture w/ sound then goes out in seconds
Post by: egm on July 19, 2009,23:22:55

hi amin

Thanks for the info it helps me a lot. more power....
til next time...

ed

Title: Re: sharp 21V-J70M yellow picture w/ sound then goes out in seconds
Post by: summersun on July 21, 2009,22:52:50

MAYBE YOU CAN CALL AN EXPERT ABOUT TV TO HELP YOU.

Title: Re: sharp 21V-J70M yellow picture w/ sound then goes out in seconds
Post by: P.R.Gore on July 23, 2009,14:53:24

Hi,
TA8403 is vertical O/P ic & it has nothing to do with blue dark raster. Check voltage at B cathode ,if it is low then fault may be of B amplifier circuit or B cathode getting leak with filament or G1. For B cathode short with filament, wind 3 to 4 turns of wire around FBT core, remove origional supply of filament from PCB, join two ends of newly wound wire to filament. Now ur tv will start working well without replecing CRT!!

Title: Re: sharp 21V-J70M yellow picture w/ sound then goes out in seconds
Post by: egm on August 06, 2009,06:46:07

Hi,

Thanks for your help it works, perhaps this is a late reply one more thing, do you have links to download schematic and servicemanuals. Thanks again... more power...

egm