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Re: My grand daughter owns a portable tv doesn't stay on
This is an indication of a possible High Voltage problem, your set has what is called a shutdown circuit which detects excessive current which may cause X-Radiation to occur. The problems that may cause this are a short circuited Integrated High Voltage Transformer, a shorted circuited or open protection capacitor, or a defective Horizontal Output Transistor. To be sure you can buy the schematic and with a multimeter you can examine the voltages (power on) and resistances (power off and unplugged) of the components just mentioned. If you do not have a background in electronics, I would suggest that you have a TV repair technician look at the set and give you an estimate on it repair.
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the tv is getting turn on but detect an error that is why go to safety mode.if you know how to check component parts tried to disconnect first the ballast board which may have shorted component. then turn on the tv set if the tv doesn't shut off that was mean the ballast board is the cause of shut down.if you think you can not do the repair just send it to the service shop to do the job.
The first couple of seconds of operation, most TVs are doing some self-test and if something has failed making full power on dangerous (for fire) they will shut down.
Either a major component in the horizontal section has failed or the main power supply itself is defective.
I had the same exact problem!!!! If you unplug it, then plug it back in after a couple of days. You will hear a frying sound then a loud clap!!!! Solution: Replace it with a LCD.... Not worth getting fixed!!!
the relay on the power board needs to be replaced; if you feel confident to do this:unplug the tv wait about a 1/2 hour then remove the tv's case carefully look for a small black or, brown box about 1/2" x 1" x 1/2" this relay should have a designation such as Rly 1 printed on the circuit board it must be unsoldered and, removed the numbers on the relay can be entered into a search engine to find a replacement