Question about Toshiba 19A25 19" TV

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Toshiba 20as25 Dc voltage goes to 220v should be 115v

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  • Steve Allison
    Steve Allison May 11, 2010

    Your details are too sparse to do anything with; the message doesn't make sense.


    What DC voltage are you measuring and where? 

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Optoisolator is probably bad, horizontal out is bad also, check a transistor c3138 and change also

Posted on Aug 06, 2009

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If you measuring the secondary voltage will it 's a 115 volts

Posted on Oct 16, 2008

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http://electronicshelponline.blogspot.com/
Type in this key phrase " my service table today " in the search box at the top right of the display window of the home page, to get gathered some pages which has the details of practical experiences to the author of that site.

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hi good day

the first thing you can do is to unplug the tv unit not to used for an hour to discharge excessive voltage at the power supply board to reset the dc supply at the main board. then after an hour try to plug and turn it on. if still doesn't work at this time you will need to make a voltage checking if you know a basic electronics trouble shooting or you want a DIY just follow some of my steps by steps repair instructions.first you must need to check the output dc voltage at the power supply section, if their is an output which supply the whole circuit just be careful since you are dealing with some high voltage. the supply at the indicator light at the front is just only the stand by voltage. you will need to check the B+ voltage which around 110vdc at the horizontal section which turn on the whole circuit. you can used a digital tester to make a voltage checking just set to dc voltage. if their is no presence of 110v dc at the horizontal the vertical and the tuner section will not turn on. usually the cause problem like this is bad horizontal output transistor and an open resistance circuit going to transistor.check also for an open or defective resistor replaced it with same value.hope this can be helped just let me know if it works feel free to ask further solution thanks for using the fixya service good luck.

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Sir First check video output voltage it is near about 180vdc to 210vdc If it is not correct find the reason,and then check RGB cathode voltages it is 180 to 220v dc. Finaly check lot and crt.
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1 Answer

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you need to check the voltage output of your power supply section.This power supply supply is a switching type power supply.there is a chopper transformer in there.its supply is a dc voltage unlike any other transformer which is AC supplied on the primary..First step.
1.Using a multitester measure the primary supply it is a DC voltage around 220v - 110 VDC
2.Measure the secondary output.The out put is AC voltage the supply for the B+ going to plyback is 115vdc the second output is 12v run through a regulator and the regulator lower the voltage to 5vdc.this 5vdc supplies the system IC and the jungle IC.this ic process the switching of the plyback transformer and the plyback transformers output supplies the voltage of the whole system including your relay in the degaussing section....once the plyback is activated the tv will now turn on...

good luck!Hope i helped you..

please rate my help..god bless!

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Open the case, then look for anything that burned out, replace it!!!

If still won't start, you need a multimeter, soldering iron, try locate output diode on power regulator board, then measure the voltages, it has 3-4 type of voltages;
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1 Answer

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