Yes we just picked up this set and was told it lost picture and sound after a power surge.my question is: there are 2 fuses on front portion of main board that are blown and are designated as f850 125v 5A, F851 125V 5A,on the board. they are pigtail type but are rectangular black plastic with soc 5a stamped on them. are they thermal,quick blow, ic protectors or what i just cant seem to find these anywhere to replace the blown ones and i am not just going to replace them with the glass 5amp without knowing just exactly what belongs there.. can you please help with this? thank you for all help. donna
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as there are 2 completely different circuits for sound and picture in a tv set it is possible that the picture board has been damaged by the power surge . it could be as simple as a blown fuse for that board or you may have to take it to a repair shop for a proper diagnosis and a quote
There are several types of internal fuses. sounds like the ones you are looking for are related to providing power to your unit. IF you open up the chassis and follow where the power cord attaches - it will lead you to the power supply board where there are often removable fuses that protect the internals for power surges. Some components actually have these fuses accessible from the outside either integral to where the removable chassis power cord connects or in a fuse holder that unscrews.
Yes , usually you will need the manual to know how to replace it In my experience the fuse blow due to something that is electrically faulty in the unit and changing the fuse does not remedy the issue. You may have a power supply issue that a reputable service tech will have to determine if it is malfunctioning in this area.
If you don't have any indicators working, you have probably lost your power supply. With no picture and no sound the chances are you have either lost the power supply or blown a fuse. If you remove the cover and look at the circuit board there is a fuse located near the rear of the chassis near where the power cord connects to the chassis. If the fuse is blown, it is advisable to replace your damaged power cord before replacing the fuse. The cord could have a short and this could create a fire. Be very careful when working on any television. Be sure it is unplugged for more than one day to allow the high voltage to decay from the picture tube. Do not touch the picture tube, it still may have some residual voltage and could shock you. If you replace the cord and fuse and still have the same problem, you will probably find that the high voltage transistor is bad and needs to be replaced.
Check the solder connections on capacitors C809 and C810 they are located on the left side of the chassis looking in from behind also check fuse FL860 as the solder joints could open that fuse. usually when the power led lights but the set wont power
Well without the schematic, knowing Toshiba they have alot of convergence problems, so see if the fuse blown in the convergence area, if you you may have to replace convergence amps. These are the big STK's. Most of the time there was a color problem with set before going out. If no problem with this on your set then look in the HV area Hor. and Ver. area. Hope this helps!