Question about Televison & Video
You need to check the output voltages of the power supply to see which one goes off. It may be due to short circuits some where
Also note that
The power supply converts the 120/230vac 50/60Hz into DC, then the high frequency (50~100kHz) switching circuits convert it back to AC but at high frequency which allows the power supply to use smaller and much lighter weight transformers (Ferrite core instead of heavy iron core), then this high frequency AC voltage is fed to the rectifier Diodes to get the DC output and filtered by DC filter capacitors that must have low ESR (Equivalent Series Resistance), if general purpose electrolytic caps are use, they will fail within a year or less due to high ESR.
The power supply has Standby 5vdc (5VSB, this is a MUST have before anything else will work, when this voltage is not present, there will be no any indicator light on the front panel) which is always on the minute the TV is plugged into the AC outlet, so it is on 24/7 and that is why the power supply will fail even though you may use the a TV not very often. It will see all the voltage spikes and surges 24/7.
This 5vdc is used to power the Processor and the Infrared remote receiver module which will be waiting for the command from the remote control or from the power switch, when the Power on command is received, the Processor will send the turn on signal (3.3~5vdc) to the power supply module (PSON pin) to the switch on the main 5vdc for the rest of the logic and Tuner circuits, 12~16vdc for the sound amplifiers (mostly Class D amplifier for efficiency and small size) and for the T-CON board (interface board between the LCD panel and the Logic board), and 24vdc for the Back lights inverter board (if there is no 24vdc then no back light).
Blown main AC fuse due to shorted out Diodes, transistors.
Bad capacitors leaking or bulging tops
Shorted Diodes, transistors in the DC output side.
Hope this helpout.....
Posted on Jul 13, 2010
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Posted on Jan 02, 2017
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Apr 05, 2015 | Mitsubishi Televison & Video
Mar 20, 2013 | Mitsubishi WD-62327 62" Rear Projection...
1. Turn the power off, wait until the power indicator turns off blinking red, then unplug the power cord from the wall outlet and confirm that the area around the lamp unit has cool down.
2. Remove the front cover procedure. Place your finger tips under the cover and pull it from the projection display.
3. Before loosening the lamp cover screw, first read the caution and warning labels in the lamp cover. Then loosen the lamp cover screw by using a screwdriver.
4. Loosen the lamp unit screw with a screwdriver. Then grasp the lamp unit, Figure 2, by the lamp unit handle and slowly remove it from the projection display.
5. Insert the new unit being careful being careful of the insertion direction. Press in the arrow mark making sure insertion is done correctly.
6. Replace the lamp unit and cover screw. Tighten the unit cover screw with a screw driver.
a. Properly dispose of the old lamp. Please see the operating instruction of the projection display unit.
b. NOTE: attached the lamp unit and lamp unit housing door securely. If the lamp unit and the lamp unit housing are not attached securely, the protective circuit will be activated and the lamp will not turn on.
7. Replace the front cover.
The second step, after lamp replacement is to follow the three steps procedure described below:
Warning: Perform lamp time reset only when the lamp has been replaced.
In order to complete the lamp time reset procedures:
1. Be sure the power cord is plugged into a properly grounded wall outlet. Then, press the POWER button the projection display or the remote control to turn the unit on.
2. While pressing the VOL - button, hold down the PIP or the SPLIT button on the remote control at the same time for more the 5 seconds.
3. When the reset procedure is complete, the projection display screen will show the following message "Lamp time was reset to 0."
1. The writing in the screen may be different from the actual screen described above.
2. When lamp time reset is finished, the lamp indicator goes out.
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