Question about Projection Televisions
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.
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It sounds like your switching power supply or you High Voltage power supply has malfunctioned. These sections control all power to the TV and can produce the situation you are describing. If you do not have a background in electronics, I would suggest that you have a TV repairperson come over and check your TV out.
I say this because there are voltages in a TV set that can kill, so caution is needed.
I hope this helps
Oct 17, 2007 | Toshiba TN43V71 43" Rear Projection...
The problem may be in your switching power supply or in your high voltage power supply, I would suggest that if you have a background in electronics you do the following.
1) look for any blown fuses and replace them
2) Using a schematic measure the incoming AC voltage and the DC levels on the output of the switching power supply.
3) remove power from the set and take resistance measurements to determine if there is a short circuit anywhere in the DC path.
4) Measure for shorts and opens in the High Voltage section of the set.
These are the usual checks you will have to do.
Now if you don't have a background in electronics, I would suggest that you have a qualified TV technician come over and check your TV set.
I hope this helps,
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