Question about Mitsubishi WS-65809 65" Rear Projection Television
Tv shuts off if it gets to cold and i have to put a space heater behind lt to come back on.some times it takes hours and the all it does is flash the green light
TV shuts off if it gets cold,this is the symptom of "cold solder" in power supply section and also in DM board section.needs to reworks or resolder the solder joint.
The constant blinking green light means that the TV is not booting up. This is a common problem on this set.You need to remove the shield from the DM board (standing upright on the left where the DTV RF connector is)and inside you will see the four leaky capacitors (1000 MFD 16 VOLT)replace them,plug the TV in and wait 70 seconds for the blinking light to stop,then turn on the TV.The hard part will be removing the board from the TV(lots of screws and connectors,takes time)
You must do some checks first: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 # 934C067001 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). 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 . 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. 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.
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Posted on Oct 08, 2008
Tips for a great answer:
It could be a problem of cold solder joints, or solder joints
on the main board which have cracked over time due to thermal expansion and contraction
of the circuit board. Repair is to find and reflow the cracked joints. You may
want to consider hiring the services of a reputable repair professional to deal
with getting your set back into normal operating condition.
However TV's attempt to protect themselves from damage by
shutting down. Your unit has three main ways to protect from damage.
The TV monitors various DC voltage supplies. If one of the
supplies is missing. The TV shuts off.
The TV monitors excessive high voltage and beam current. When
the TV detects that one of these is too high the TV shuts off.
OVER CURRENT PROTECTION
This will activate if excessive current drain on the 130 volt
supply line. If the TV detects this supply line is too high the TV shuts off.
Most units made in 1999 have a diagnostic mode to help
determine the cause.
Thanks for contacting fixya.com
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