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Main => Monitor/Video Forum => Topic started by: kapotik on September 27, 2015, 04:57:13 pm

Title: Problems monitor 33"
Post by: kapotik on September 27, 2015, 04:57:13 pm: Hey guys, sorry for my English, google is my friend, I tell them a few years ago bought a monitor 33 "with chassis Sharp Image 15kHz or I think, the question that for space never hize walk, now I I decided to start it up and try it without changing all capacitors, simple task since some electronics were and had already done that before in another chassis, the issue is on but the monitor shows no image, with VGA cable probe and soft 15 with separate synchronicities and nothing, also with plate converting VGA to CGA and nothing the same, I have some photos and a video have if I can help thanks.

(http://image.jimcdn.com/app/cms/image/transf/dimension=1920x400:mode=fitin:format=jpg/path/s428e7d2c50f54516/image/i1ed62742c1b55fde/version/1443383150/image.jpg)

(http://image.jimcdn.com/app/cms/image/transf/dimension=1920x400:mode=fitin:format=jpg/path/s428e7d2c50f54516/image/ifa8445fd48ef5e56/version/1443383739/image.jpg)

el chassis

(http://image.jimcdn.com/app/cms/image/transf/dimension=1920x400:mode=fitin:format=jpg/path/s428e7d2c50f54516/image/i3b70ab3f29df4e85/version/1443383245/image.jpg)

(http://image.jimcdn.com/app/cms/image/transf/dimension=1920x400:mode=fitin:format=jpg/path/s428e7d2c50f54516/image/ib86a4fd416d7d35e/version/1443383353/image.jpg)

(http://image.jimcdn.com/app/cms/image/transf/dimension=1920x400:mode=fitin:format=jpg/path/s428e7d2c50f54516/image/i3b8010b601e96c3c/version/1443383401/image.jpg)

(http://image.jimcdn.com/app/cms/image/transf/dimension=1920x400:mode=fitin:format=jpg/path/s428e7d2c50f54516/image/ic53c40aa05cc01fb/version/1443383451/image.jpg)

(http://image.jimcdn.com/app/cms/image/transf/dimension=1920x400:mode=fitin:format=jpg/path/s428e7d2c50f54516/image/i939250514fb7bada/version/1443383513/image.jpg)

(http://image.jimcdn.com/app/cms/image/transf/dimension=1920x400:mode=fitin:format=jpg/path/s428e7d2c50f54516/image/i3331d96ffaa3e1f8/version/1443383585/image.jpg)

(http://image.jimcdn.com/app/cms/image/transf/dimension=1920x400:mode=fitin:format=jpg/path/s428e7d2c50f54516/image/iab3fb877e5e9a302/version/1443383627/image.jpg)

video

http://youtu.be/2EmFUJPrIwg (http://youtu.be/2EmFUJPrIwg)

diagrams:

http://arcarc.xmission.com/PDF_Monitors/Sharp%20Image%20134%20Trouble.pdf (http://"http://arcarc.xmission.com/PDF_Monitors/Sharp%20Image%20134%20Trouble.pdf")

http://arcarc.xmission.com/PDF_Monitors/Sharp%20Image%20134%20Schematic.pdf (http://"http://arcarc.xmission.com/PDF_Monitors/Sharp%20Image%20134%20Schematic.pdf")

[Fixed video link -- Scott]
Title: Re: Problems monitor 33"
Post by: grantspain on September 27, 2015, 05:11:36 pm: looks like video b+ is missing or screen volts is really high or the video signal is not correct
screen volts is the pot beneath the focus on the flyback transformer-turn it anti clockwise
the video b+ is from pin 4 of the flyback,goes through a safety resistor-it will be open circuit if 200v b+ missing
Title: Re: Problems monitor 33"
Post by: kapotik on September 27, 2015, 05:35:53 pm: Thanks for your prompt response, screnn pot is at least B + I have to check it.
Question: This chassis is 15kHz or 24kHz?

Thank you
Title: Re: Problems monitor 33"
Post by: grantspain on September 28, 2015, 01:47:04 am: remember is said video b+,that is not the same as power supply b+

I have seen those chassis as 15khz and 24khz
Title: Re: Problems monitor 33"
Post by: kapotik on September 28, 2015, 10:55:38 am: hello, I do not quite understand that you mean VIDEO B +?
give me an explanation for dummies, :-\

thanks
Title: Re: Problems monitor 33"
Post by: grantspain on September 28, 2015, 01:58:32 pm: Quote from: kapotik on September 28, 2015, 10:55:38 am
hello, I do not quite understand that you mean VIDEO B +?
give me an explanation for dummies, :-\

thanks
its the voltage that runs the video amp circuit,normally 200vdc
it comes from the flyback transformer
Title: Re: Problems monitor 33"
Post by: kapotik on September 29, 2015, 02:35:07 pm: if we check and this ok.