Most tvs like yours flash codes using a blinking method to a number code that can be used to look up in a service manual. You might want to count the blinks then let us know the model number so we can look it up for you.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620
SOURCE: My TV won't turn on. The Green light just keeps on flashing
1. Check for no 8.4 volts DC at pin 3 of PC9A10 on the Power PCB, if low or missing replace PC9A10 part # 268P058020. 2. LED does not blink at plug in. Check for 3.3-volts DC at connector RF pin 3 (system reset) if low or missing suspect the reset switch S7L20 part # 432P109010 on the Control PCB. 3. LED does not stop blinking after plug in. Verify the standby supplies, 12-volts at connector KA pin 17, 6-volts at KA pin 18 and the 28-volts at KA pin 19, if the supplies are present suspect the DM PCB part # 934C067002 4. LED does not stop blinking after plug in. Check C9B01, C9B02, C9B10, and C9B11 (1000 UFD 16) on the DM PCB, if they are bad replace them with part # 181P734030 (680 UFD 16 V). 5. LED stops blinking after 70 seconds of plug in but will not power on. This model is equipped with a keyboard lock feature; this can be mistaken as a no power condition. To unlock the keyboard press and hold the "menu" button on the front panel for 10 seconds 6. LED stops blinking after 70 seconds of plug in but will not power on. Check for 3.2 volts DC at connector RF pin 4 and 5 on the Signal PCB if low suspect problems with the switches/buttons on the Control PCB part # 935D736001 7. LED stops blinking after 70 seconds of plug in but will not power on. Keyboard is not locked and key inputs at connector RF pin 4 and 5 check good suspect the E2P PCB part # 934C061001
SOURCE: mitsubishi-ws55859 power failure flashing timer green light
the capacitors on the DM need to be replaced. Very easy repair you can get the repair kit at this link which is for your model it contains the replacement capacitors and step by step insturctions.
http://servicemanuals.vstore.ca/product_info.php/pName/v21v19-mitsubishi-dm-repair-kit/cName/repair-kits
SOURCE: Model WS-55909 Green light flashes won't go out. No TV
You need the WS55909 - WS73909 DM kit. You can get it at the following link which contains the capacitors and the CD with instructions on how to do the repair.
http://www.tvrepairworld.com/
SOURCE: blinking green light tv won't turn on
I suspect both of you have a failed main power supply, this model may not be well-protected against brownouts or surges.
The main supply is usually a separate board and if you remove the lower rear panel, look for a board that seems to be related to the AC line and has larger components than the other boards.
Some of them will be cylindrical and others block-like.
Look for a board number since this is a component that is often outsourced and may not be from the same manufacturer in every set.
Call the nearest service center to inquire about repair or replacement costs.
Diagnosis: If none of the above test resolve the issue, then the failure lies in one of the following:
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