When I turn the TV on, it immediately shuts off. I used to be able to fix the problem by unplugging the unit for a while, then plugging it back in. That doesn't even work now. Is it the switch or wiring? Someone suggested it may be some sort of tube issue?
Fix this exact TV today with the same symptoms of shutting off immediately when it comes on for a split second. Removing the cover showed a filter capacitor that showed it had excessive heat on it for some time as the plastic wrapper is recessed from the top. Unfortunalte I forgot to write down the
capacitor designator but it is hard to miss as it is relatively big about 2 inches tall and has a diameter
of around 1 inch. The value of the capacitor is 330uF, 160V. It is near the control IC801.
It is also a good idea to replace C863 (4.7uF, 50V) a startup capacitor as someone else already
suggested since you are already have the unit open.
I replaced the 330uF, 160V cap with one that is 470uF, 200V of the same size. This TV was manufactured in 1994 so it is understandable this cap has reduced in value and has its ESR
parameter increased due to the high ripple current. Replacement of this cap should give you yet
another 10 years of service unless something is broken with it.
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Sir the problem of your unit is the lamp try to replace it it is much better to use a gloves and wash your hand after replacing the lamp because this lamp contains mercury. follow this steps.
1. Unplug the unit to main ac outlet. Remove the bulb housing cover from the back of the TV. Using a screwdriver, carefully remove the cover to reveal the old bulb. Using a cloth, remove the bulb from the TV by first unplugging it from the wiring harness. Carefully rock the harness back and forth until it comes free from the bulb. Push in the bulb slightly and turn it a quarter-turn to remove it from the bulb housing. 2. Install the new bulb. Do not touch the new bulb with your fingers, as any grease or fingerprint from your hands will damage the tiny mirrors in the bulb. Instead, carefully handle the bulb using the cloth. Insert it into the bulb housing and secure the door. Test the unit. Plug in and turn on your Toshiba TV and make sure that the new bulb is installed properly and that the image looks crisp.
3. Reset the lamp time counter. Each Toshiba TV comes with a lamp hour meter stored in its software. If you do not reset the lamp timer, the unit may stop operating when it gets to a certain time (refer to your manual because each Toshiba TV is slightly different). To reset your Toshiba lamp timer, turn off the TV, wait 10 seconds, hold down the "on," "menu" and "input" buttons on the remote at the same time, and turn the power back on. A yellow light should appear in the bottom corner of the TV indicating that the lamp timer has been reset. Hope this help good day and best regards.
Sounds like a system failure - one of the controller boards may have gone bad. If the unit is still under warranty, contact Toshiba for warranty service. Otherwise you will need to contact one of the authorized service centers or your local TV repair guy to arrange for repair.
Some ceiling fans have jumpers that can be moved to select a different frequency but you have to be sure both the remote and the fan receiver are set the same. Other than that, you may have to use some creative control. For example, I can turn on my TV by pointing the remote at the wall opposite the TV
so, you have a television that turns off immediately after you turn it on.
It sound like your power supply on the unit is out. Because I don't know the value of your unit I cannot comment on replacing the unit. But I would recommend that you use our website to find a Flat Panel TV Repairman near you. You may want to call to get an estimate on replacing the power supply before considering replacing the unit.
You may have inadvertantly loosened a cable connection to the DMD or logic board... You might be able to shut it down, unplug the unit and remove the lamp.. With the lamp out take a good flashlight and shine it into the lamp housing area inside the Tv and see if you have any wire obstructions that you could have contacted with the edge of the housing as you were removing or inserting the lamp...