Mitsubishi WS-65809 turns off right away

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In general this happens when it has problem in the feeding source they can that there are a few blown or burst filters

Good chance it took out the str regulator in the power supply.

U know how to solders?Replaced the convergence ICS and all it resistors,should get ur power back.Tries Websites Tv repair World.com,Tvrepairkits.com.First check ur DM power board see not any burn parts first.

Do you have the tools required to solder electronics? Do you know how to solder electronics? Have you been trained in CRT safty ? Do you know about High Voltage safty? Is the tv Model number WS-65809? Do you know how to perform static geometry adjustement on a WS65809 if needed? Do you know how to perform static convergence alignment on a WS-65809? Do you know how to perform fine convergence adjustement to a WS-65809?

IF
The answer is :yes yes yes yes yes yes yes yes
AND
You can retreive an error code of 23 or 24 right after the tv shuts
itself off .
THEN
There is a 95% chance that I could tell you what to solder , no parts need to be replaced in your television and you would not have to pay someone to repair it.

thats a sign of worn out capacitors.. have your TV checked by a technician.. then can easily fix it by changing capacitors.. capacitors are cheap..

Replace all 7 capacitors in the DM Module on the DM Power Supply Board. If it is similar to the WS-65869 and WS-65513 it will have a metal enclosed DM Module at far left of chassis, looking from rear. About 4 or 5 connectors, screws, and Module slides out. Take top shield off. Take good notes or use digital camera or video recorder to make re-assembly easy. These capacitors are 1000uf@16 volts. They always check good, just replace them! After re-assembly plug AC in and wait 90 seconds or more (green Timer LED will stop blinking), then press Power button. If Timer LED doesn't stop, look for small pinhole (System Reset) and press switch with pen or small screwdriver, then wait for green LED to stop blinking. Then Power On TV.

press the menu and input/device buttons both in together on the front of the set and hold for 5 seconds and then see if the set blinks a number of blink pauses and then blinks another number such as 2 blink pause 2 blinks which would be a 22 caode. It then repeats that code.

its most likely has a 22 error blink, if menu and device are pressed together and held for 5 seconds to activate the self diagnosis feature. which would indicate short protect.

check 2 5amp chem fuses. in middle of tv. yellow or orange in color . if bad replace the 2 stk convergence ics and fuses.