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Main => Monitor/Video Forum => Topic started by: mike10kfs on April 22, 2009, 02:51:27 am

Title: Pentranic ch250 monitor board schematics
Post by: mike10kfs on April 22, 2009, 02:51:27 am

Hi All

Anyone had problems with obtaining parts or a schematic diagram of this board as i can't find find one availible anywhere

one of the main diodes has blown not sure what caused it so need some info please

regards Mike

Title: Re: Pentranic ch250 monitor board schematics
Post by: grantspain on April 22, 2009, 06:05:02 pm

i have the schem,its pdf file and i don't know how to post it here-if you pm me an email then i will send it over

Title: Re: Pentranic ch250 monitor board schematics
Post by: Mauzy on April 22, 2009, 07:16:00 pm

Awful lot of Pentranics coming up all of a sudden. They're a ---smurfette--- to repair considering the lack of archived knowledge about them.

Title: Re: Pentranic ch250 monitor board schematics
Post by: Kevin Mullins on April 22, 2009, 09:35:28 pm

Quote from: grantspain on April 22, 2009, 06:05:02 pm

i have the schem,its pdf file and i don't know how to post it here-if you pm me an email then i will send it over

It'll let you when you reply go down to "Additional Options" and click on it.
(just like posting a pic or something as well)
Of course it still depends on how big the file is. (max 1024kb)

Title: Re: Pentranic ch250 monitor board schematics
Post by: Lord_Vader on January 08, 2013, 04:56:36 am

Quote from: grantspain on April 22, 2009, 06:05:02 pm

i have the schem,its pdf file and i don't know how to post it here-if you pm me an email then i will send it over

Hallo Grantspain :) I need too this Schematic. Can You send me ? rafal.popiel@bluewin.ch
Thank You very much. My englisch is not good. Sorry

Title: Re: Pentranic ch250 monitor board schematics
Post by: grantspain on January 08, 2013, 04:43:31 pm

think this is it

Title: Re: Pentranic ch250 monitor board schematics
Post by: Lord_Vader on January 10, 2013, 05:19:01 am

Grantspain, thank You very very much. I have Big Problem with this Monitor. Was damaged TDA1675 and R315 and Q302 too. After replace Vertical Deflection work but not work v-center adjustment (VR 703). I have replaced Q302 original was 2sc1213 (replaced bc337) and Q303 original was 2SA733 (replsced bc557a). After replace burning R317 and Q302.
I have destroyed 3 pieces of this trasnsistor.

Anyone have any Idea ? Please Help.... and Sorry for my bad English :)

great Rafael

Title: Re: Pentranic ch250 monitor board schematics
Post by: grantspain on January 11, 2013, 05:17:04 pm

yeah,try putting the correct transistors back in then see if issue with blown components is resolved

Title: Re: Pentranic ch250 monitor board schematics
Post by: Rickn on January 23, 2013, 09:51:21 am

Check/ replace C301, C303 and C305.

Good luck
Rick