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find a electronic repair shop and ask them look up the ic number. if they they can read the program of of the old chip, they can put it on a new eeprom. somtimes the chip wont work but can still be read..
also have tried to find the board it self on a lcd parts web site? http://www.lcdparts.net/
also you may want to see if ebay may have a scratched up monitor of your or one they has a power supply problem.
I have sucessfully repaired three I-Inc CY199D monitors which all had the same problem.
The monitors program is stored in a 24LC16B which is a 16K serial EEPROM in a SO8 package.
The bad part is you have to remove this eeprom to program it as it is write protected on the board and you will need a serial EEPROM programmer and an uncorupted program I have all the above.
If there is enough interest I could offer preprogrammed EEPROMS or a repair service for the graphics card..
The problem is the program for the graphics card is stored on a 16K serial eeprom which is used as a rom this can get corrupted which causes the problems you are experiancing.
I have repaired three of these monitors by re-flashing the eeprom with a program cloned from a working monitor all worked fine after refashing.
Now the bad news as the eeprom is used as a rom it is write protected on the board so the only way to program it is to remove it flash it with a valid program and then replace it easy if you are a surface mount expert.and have a serial eeprom programmer.