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hi, your monitors horizontal deflection side have some problem. you have to check the horizontal width cotrolling transistor mounded on the aluminum heatsik near the lot( line output transistor). also check the three mosfets which adjust the width for different resolutions. there are three such mosfets in the horizontal section.
fist of all replace the width controlling transistor in the heat sink. photo of mosfet and transistor is added for reference. not the exact number. ok
the output transistors are 5 to 10 bucks each for most.there are 2 or 4 on each channel,depending on brand .some high end amps have 10 transistors on each channel.mosfets are a different story as they run 20 to 50 bucks each and there is 2 or 4 on each channel.some amps use a big IC instead of transistors.those have 16 to 24 pins and are easy to change. Those IC are 25 to 75 for a stereo one like stk4141 etc.since most yamaha amps are dc coupled,when the output transistors go,they take out the driver transistors as well.If you replace the outputs and the drive transistors are shorted,they will blow the outputs again.
It may be a mosfet in the power supply section that is blown. These parts are usually available from electronics part suppliers. Or it may be one of the amplifer transistors that is blown and it will also usually be available from parts suppliers. This fault is usually caused by battery voltage dropping to low so the amplifers output starts to clip and put D.C on the mosfets causing them to blow.
The Power Mosfets may be damaged and therefore causing your power supply fuses to blow. The fuses on your amp may be higher current rating than the ones in your vehicle and that is why they are not blowing
Hiya try http://www.icpowerx.com for the Mosfets, you will probably need to replace driver transistors also (not always but sometimes they go). Also check the resistors to output, they will be the big white ones. Go here to read on testing FETs http://www.4qdtec.com/mostest.html Just to be sure. If one is blown, replace all
What probably happened was both of the final audio output transistors shorted. This caused a higher than normal drain on the switching transistors on the primary side of the torrid power transformer causing one to short and then blowing the fuse. I replaced both switching transistors and ramped up the current to about 5 amps. I could see the power supply was not working but there was still a short. I traced the short to both audio output transistors. Replaced them and unit is like new. After I found a service manual on this item it was a breeze to find the problem.
The amplifier probably has shorted output transistors. If the amp only blows the fuse after remote voltage is applied, the damage may be minor. They generally blow two transistors. Sometimes that's all that needs to be replaced.
whenever fuse blows every time it is the indication of short circuit in tv.
so please do not put fuse unless you know the cause of blowing fuse.
these are the reasons of blowing fuse.
1 main filter cap.short.
2 rectifier diode short.
3 swithing transistor short
4 horizontal output transistor short
5 caps & diodes connected to flyback transformer short.
6 print short.
7 at last if every thing ok then flyback transformer defective.
hope this will help.
if you are not a tech person call skilled tech to fix it.