Question about Toshiba 43HX70 43" Rear Projection Television

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No boot up

Red light on the front is on, but no boot up
changed cxp75010 and an... ic,s and a few transistors
power supply is working correctly
still same problem , any ideas?
no sound no image

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  • 167 Answers

Hello it sound's like your fly back transformer is bad check the horzantal output transister.and it.!!! change them and your set will work. most likly.!!! "GOOD LUCK"

Posted on Nov 05, 2008

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Check the horizontal output transistor. Replace the same. Collector to base, or collector to emitter short to this transistor is a common case. If you wish to get more details, check this link. http://electronicshelponline.blogspot.com/ Selecting the view option, either to Mosaic / Time slide, can be selected by the drop-down list, at the top left of the display window, will make surf easy. You can also do a search, by type in the brand name/model number/IC used, in the search box at the top right of the display window.

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Hi,

This problem is likely a failed power supply. This is a known issue with this model TV. It will normally occur soon after the warrenty expires. It can also be caused by a voltage surge produced by a power failure. You might wish to unplug the TV for an hour or more. If this power reset does not allow the TV to turn on component failure is indicated. These sets are assembled using the wave soldering process they are known for having cold solder connections. The safety circuitry shuts the TV set down or will keep it from turning on when it detects a problem. This model of TV has over 2,000 parts, which includes millions of transistors inside the integrated circuits. The capacitors will change value, leak and become defective. Resistors will change value and burn. Diodes and IC can go bad. This may have a domino effect and cause other parts to fail. Replacing one defective part may make the TV operate for a short time but the part will fail again if the parts that caused the failure to begin with are not replaced. The only way to know for sure which parts that are no longer within factory specs and for a proper repair all the electronics must be diagnosed by someone with the correct electronic test equipment specifically designed for TV service and the skills to use the test equipment. I wish I could tell you there was a quick fix or button to push that would fix the TV but that is not the case or the solution needed to get the TV operating correctly.

Let me know, if need further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

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your set needs to be repair by a tech you are having a problem in your power suply which is intermittent.either your hrizontal ic is shorting out, or your regulator or your microchip ic.or the diode that couple the collector of the horizontal transistor with the b+ from the fly back.or check for lose solder in the horizontal output or power supply. good luck

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