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Follow the instructions from this website and you should be able to fix it.
If the instructions did not help you to fix it, there could be that the green tube is defective or a video amplifier IC on the blue CRT board.
Your pip module has went south.The capicitators on the board have leaked and ruined the board.Agood tv repair man can bypass the module to get you a full screen picture again.The only problem is you will no longer have pip ability.
1. NO VIDEO, BUT HAS VIDEO WITH PIP ON. CHECK C763 (1UF 50V) ON THE BASE OF Q715, LOCATED ON THE UCOM-PCB. 2. NO MAIN VIDEO, THERE IS VIDEO IN PIP ON EXT1 AND EXT2:-CHECK FOR 1VPP OF LUMINANCE ON PIN 1 OF IC7000, IF MISSING OR LOW CHECK THE VALUE OF C7001 (4.7UF 35V), LOCATED ON THE PIP-PCB. THIS CAP MAY LEAK ELECTROLYTE ONTO THE BOARD AND OPENED A FEED THROUGH IN THE PATH BETWEEN C7001 POSITIVE LEAD AND THE EMITTER OF Q7003 OR CAUSE INTERMITTENT COLOR. PART # 181P504090. (CHECK ALL 'SMD' ELECTROLYTICS AND TRACES ON PIP) 3. NO MAIN OR PIP VIDEO, CHECK C7014, 47 UFD 16V ON THE PIP PCB. PART # 181P502060 4. CHECK FOR 7.2V DC ON THE BASE OF Q7003, IF LOW OR MISSING. CHECK THE VALUE OF R7002 (150 OHM 1/10W).LOCATED ON THE PIP-PWB. PART # 103P401050 5. SUSPECT R2045/R2048 (6.8 OHM 3W) FOR OPEN/RAISED VALUE. LOCATED ON PCB-SIGNAL AT 5V REGULATOR IC2003 PIN 5.
If the source to the PIP input is a color signal then the PIP display will be color. PIP sets have two video sources one goes to the main screen while the other goes to the PIP. it all depends on what the format of the signal is being sent to each input. This is quite normal.
rule number one about all vs chassis with vertical can pip boards
take them out and throw them away
i could fix one but you couldnt beleive me
and it wouldnt be worth your while
do a search on your modle number until you come up with instructions on how to add two caps to the pip board connector to bypass it
until you do this you are wasting your time
Mitsubishi ... we're still building Zeros