Circut diagram LG 500g color momitore

If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ Circuit diagrams of many popular brand TVs and other devices are given. You can get details there.

open the monitor there is a movable preset attached to EHT rotate that preset by screwdriver in active on condition of monitor reduce the brightness to satisfactory level

your irf 630 is not original purchase it from proper LG authorised service centre it is costly but never become faulty again duplicate mosfet overheats if your green led is on then measure voltage at E.H.T.connect meter at output transister if E.H.T. is producing then meter should show 1 digit if not then 50v will show take care that signal cable should be disconnected if E.H.T. is not producing then check +vcc at horizontal ic it should be 12v. if 12v is not present then check regulator ic 7812 insmps

Sir,
there could be two possibilties for that
1 That your serial cable is not working or have broken pin .
&
2 Another is that you monitors picture tube has got damaged or burnt.

Usually it is second reason it can be repaired but is more expencive so i would prefer buying new one.

The normal crt monitor have a demo display when you unplug the vga cable to PC like this image below..
Note:
If the crt monitor green LED light steady and heater beam have light, the horinzontal and High Voltage supplied to tube is completely good. If you encountered this problem just focus on video section of crt monitor. But before you start... find the flyback transformer behind this they have two controls screen & focus. After you found it plugin the monitor use plastic precision or small screw philip driver for safety to high voltage at horizontal area choose screen control rotate it to clockwise direction follow this....
If the display responses or from dim to lighter 100% you have a problem to ABL find this at the bottom of horinzontal section near at flyback transformer pins trace the line of ABL for dried solder, open resistor if nothing happen find the Video IC at chroma section and replace it. follow this...
For LG & Redfox you found LM1269NA Visit this site for seaching semiconductor matches www.alldatasheet.com Good luck.

Check this site for searching semiconductor
www.alldatasheet.com

lg 500g studioworks green color

yes the diagram is in book of G.T. hardware engineering college jaypur in rajasthan india the books are available in metro citi and authorised suppliers only in that book not only diagram but troubleshooting mathods are also given

reduce the number of colors until you can get a resolution that works the monitor cant handle the number of colors and the number of lines of resolution this is a common problem with older monitors.

l8r

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Check components related with pots thats adding command ic to pots.If they are ok then change command ic with new one.Before this you can check horizantal hold transistor that is placed on hitsink of eht.small in size and check two small transistor placed near it on pcb.Hope this solution works .If not then i am here