Main > Monitor/Video Forum

Some New Updates on the monochrome 9 monitor !!!

(1/5) > >>

retrotubeguy432:
So I found this 9 inch green monochrome monitor,do not now what resolution it expects and what Mhz is and has 3 signal input.One goes directly to the board which plugs into the tube,so I think that is the video input(also because i only put composite signal from VCR and it makes a picture,but not steady it goes from the bottom to the top and slightly to the sides(third picture).The other two pins I think are vertical and horizontal syncs.

And what are those lines that are slightly sideways,appear when i turn the crt on with no signal,but they never disappear even when there is a signal going to it (first picture) ?  ???
(It creates nice raster but still with those lines going across the screen (second picture)  :blank:

I also wired up a vga signal from pc and it was better,the driver board has a H.frequency potentiometer,by turning it i could establish a steady picture,but those lines still go across
the screen and 3 same pictures,but after half a minute it starded to flicker again so i have to calibrate it with the potentiometer again and again (last picture).  :angry:
Also tried the LM1881N but no success    :blah:

Any help would be appreciated ! ;D

Here are all the technical details of this CRT monitor:

http://www.omnivisionusa.com/monitors/replacement-crt/replacement-crt-monitors/mono-9-inch-.htm    8)

Ken Layton:
Pictures of the monitor main circuit board would help as well as the model number label on the metal frame of the chassis.

qrz:
retrace lines .
start by turning down the screen grid .
being a monochome crt , this adjustment may be on the "neck board " rather than on the flyback.

retrotubeguy432:
Okay so I did a lot of work lately and hand drawn all the schematics of this driver and found out that on the TDA 2595 there are pins that arent connected
to anything and one of them are composite signals,syncs out (pin 9).See the schematics.

Data for TDA2595  http://www.datasheetcatalog.org/datasheet/philips/TDA2595.pdf

How to re wire it so it will take composite video ?
Help would be appreciated !  :blank:

Fisrt picture is the main board,second is the board
 that plugs into the crt tube.

qrz:
if memory serves, Motorola's MC1377 was used as an RGB to composite converter .

it did   ;D  datasheet here :

http://www.datasheet4u.net/datasheet/M/C/1/MC1377P_MotorolaInc.pdf.html

Navigation

[0] Message Index

[#] Next page