W/supply voltage fuse is ok w/output voltage no supply voltage on fly back

Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/ Type in this key phrase " my service table today " in the search box at the top right of the the home page, to get gathered some pages which has the details of practical experiences of the author of that site. The search result will display about 20 Nos of related posts. Press the "All posts" at the bottom of the list, then you can select them one by one.

I am unable to give any specific advice but if there is voltage or power to the Line Output circuit then its possible a short or load exists on the flyback transformer which causes a shutdown in this circuit.
I am afraid practise and knowledge of a particular model is a great help to find its faults.
The Flyback transformer (if like I remember) will have sub power supplies from it to drive audio, frame etc so a short on these will cause problems, also the rectifier diodes to these can fail you may need to remove one end of a diode for accurate testing.
Another failure point in power supply rails is capacitors which go open circuit this makes their voltage line unstable, also on the capacitor problem list are those around its flyback circuit that act as snubbers to tune it, these were at my time little blue capacitors of several KV which had a habit of shorting or change value.
Any of these will disturb a balanced start up cause a spike and shutdown.
Without particular knowledge of a model and its circuit I am unable to help further, I would look for shorts on Diodes and components, disconnect supply rails to audio and frame if they come from the flyback transformer (these are the heaviest loads and will only serve those particular circuits) then it will possibly capacitors gone o/c (I used to carry a cap tester years ago which used a 555 ic easy and robust).

Hope this helps in some way...

You need to check that the power supply is working. To this safely you will need a voltage meter. You can buy multimeters from most electrical or electronics stores such as maplin. On the power supply there is a diagram showing the power pins and the voltage output. You should be able to read 12VDC across the pins when the mains power is connected. If there is no 12VDC then check the fuse in the plug. This is a 3A fuse and it can be easily removed from the plug with a suitable flat blade screwdriver. Use your multimeter on resistance (Ohms) setting or on continuity (bleeper) setting and test across the two ends of the fuse. If the resistance is nearly zero or the multimeter bleeps then the fuse is OK. If the fuse is Ok and you mains socket has power but there is no power output then the power supply is faulty. If there is 12VDC out of the power supply then the Wii is faulty. If it is under warranty then take it back to the store. If it is out of warranty then get someone to fix it (if possible).

Start by seeing if you have voltage across the points when they are open. A small 12volt bulb on fly wires is useful for this exercise. Check the capacitor across the points.
If the gap is set correctly, the capacitor is OK and there is not 12volts on there, bulb lit?, check the coil next for voltage, bulb lit? then follow it back to the ignition switch, bulb lit? and to the battery fused supply and then to the battery.
Wherever the voltage is missing, bulb not lit, and where the voltage comes back, bulb is lit, is where your fault is.
Happy New Year.

Your switched Mode Power Supply has failed... Check the output from the bridge rectifier, check the Controller IC, ALL the Electrolytic Capacitors, Do a "Dry" "Diode" multimeter test on all discrete components. Check for voltage on the pins of the DC side of the fly-back transformer too. Check for shorts.

if you know aything about tvs which it appears you do check to see if you are getting voltage to the horizontal output ckt at the collector of the horizontal output transistor if you are probably you either have a horizontal drive or output problem if you are not check to see if you have either fuses or icps or pico fuses are open generally you will see about a 135 volts to yhe hoizontal output ckt.

• proceed as given after your power supply is ok (your statement)
• isolate power supply from h/output stage.
• check diodes & capacitors connected with flyback transformer.
• check for print short.
• ckeck h/output transistor.
• connect supply to h/output stage.
• put on the set.
• hope this will help.
• good luck

still there is a drop in voltage then your fly back transformer faulty.

 

please go according to procedure 1 isolate h/output section supply. 2 check power supply output is ok if not repaire it. 3 after power supply is ok 4 check hor osc, driver &output if problem repair it. 5 check for loose contact or print break. 6 connect supply to hor section. set will work fine. good luck.

as horizontal transistor gets very hot so no eht so no raster &no sound due to nosupply to vif & tuner. as hor output is getting hot please isolate supply to hor. section & check power supply output is ok as due to high voltage h/outout may get hot & demaged. if supply is ok check for leaky or short parts in hor output. 1 hor. output transistor itself if it is replaced that may not be of proper matching. 2 diode& cap.in eht section. 3 clean print near eht. 4 moisture near yoke due to rain in rainy season only. so keep it hot for few hours. 5 at last if all are ok eht or fly back transformer. re connect power to hor output after rectification

try to resolder all points in fbt including fly back trans itself area also resolder the crt pcb area i had the same problem the reason was cold soders also put a good 2sc5297 for hor out.