mitsubishi tv wont turn on

When a TV is working it is obviously alot easier to determine the problem because you can see the effects but with a TV that does not come on you have a puzzle that sometimes is very difficult to solve. On Convergence Amps and IC's there are many components; resistors, capacitors, etc.,leading off of the pins on the amplifier. I have personally changed resistors in a cluster in the convergence area that fixed my convergence problem. Now this may help you with your convergence problem but not your power problem. There is a good possibilty that you blew a component in the power supply when replacing the amp. You may have cracked a trace in a board or accidentally shorted another component. Fuses are not your only protective device; resistors,thermistors, picofuses and other compnents can cause the same power outage. First inspect the boards and areas you worked in very carefully. Look for breaks in the traces, cold solder joints or cracked solder joints. If you see anything suspicious, resolder the joint with 60% tin 40% lead. Reinspect your soldering on the convergence amp. Resolder the joints underneath the Flyback Transformer. Look for burned components or areas with dark discoloration. Bulging or popped capacitors, mainly electrolytic caps but do not ignore caps tantulum or ceramic that seem badly damamged. You are going to have to be very patient and very safe. When a component is questionable desolder one side of the resistor, cap, diode or etc. to check its real value. For transistors check your base emitter, base collector, emitter collector relations if you know how. MOSFET's are tempermental to handle and take an experienced tech to determine worthiness. IC's are also tempermental and both MOSFET's and IC's you must be very careful for ESD (Electro-Static Discharge).
Check the large electrolytic cap right by the bridge rectifier, the bridge rectifier, the horizontal output transistor, all resistors, diodes, relay's etc., on and in the cold and hot sections of the power supply. Mark them with a Sharpee as you go, so you don't check the same components over and over again Be sure to use an isolation transformer rated for the voltage and amp's you are working with. If you do not have a decent understanding of the majority of what I've described and know how to do this safely it is in your best interest to have an experienced tech fix your TV or buy a new one. I hope this helps. I know this is a lot but it is only the tip of the iceberg so be patient and persistent if you take on this project again.

I do not believe that the convergence amp would cause power loss. If it is bad and you obtain power your convergence would be off as long as there was not some other issue. I just looked at the schematics for WS-55511 and I confirm that your TV would at least power up and then possibly turn off based on a protective device that would shut the TV off to stop further damage. Personally I would focus on the power supply, starting with your power cord. Also, do you have the blinking light of green death? If so, remove the Digital Module, open and expose the DM power board and check the 7 1000uF electrtolytic caps on the board. Also when you remove the Digital Module you will need to unplug several connectors. When you do so you will also be discharging several caps located in many areas. These caps that work in the power sections supply the microprocessor and when they are bad or are there capacitance is not proper they do not allow the correct boot up of the microprocessor. Mistsubishi is a good brand but mis-engineered this particular design. They need a fan in the DM or some very low ohm resistors with very high wattage to absorb the heat being accumulated inside this Module to save this cluster of caps. After you have unplugged the connectors and remove the module just for kicks plug it all back in and wait to see if the green light stops blinking, usually 30 seconds to a minute. If it does your TV will come on and you can move on to repairing the convergence. If not replace the 7 caps and this usually solves the problem until a power outage or power interuption. Then you would have to do the same thing over again. I have dealt with this problem. But if you have no green blinking light at all then my first suggestions would be where you want to go. Another helpful tip is type in to your web browser the brand and model number of your TV a lot of times there are lots of helpful suggestions. Anyway, goodluck and be patient.

Yes this is true but your TV has to function or has to have power. Pressing the menu button and the input button at the same time for five seconds accesses the error codes but until you have some semblence of powering up this will do you no good. You have no power, no lights, nothing. Start at the power cord and work your way through the TV by block, by curcuit, and down to component level. If you need the service manual I can email it to you or however you want to obtain it. I think I may be able to post it on this site but I'm new to this site and have not done it yet. Anyway, let me know if you need it.