Replaced fuses & they keep blowing

If you keep blowing the brake fuse than you have a short in the system. Unplug the brake switch. Install a new fuse. If it did not blow than the problem is after the brake switch. Next unplug the turn signal switch, then plug the stop light switch back in and press the brake pedal. Did the fuse blow. If not than the wiring is good in between the two switches. With the turn signal switch disconnected use a jumper wire in between the light green wire (power from the brake switch) and the orange with light blue wire (power to the right brake lamp). If the fuse blows than there is a short in the right side brake circuit between the plug in and the rear socket assembly. If the fuse does not blow than jump from the light green wire to the Light green with orange wire (power to the left brake lamp). If the fuse blows than the problem is in the left hand brake wiring circuit.

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To which circuit section did you replaced the fuse? Main power retulator? Just understand, the fuses are used to protect the circuit and TV from any short circuit or over voltage. Without any one of these, no fuse will blow up. If it was due to over voltage, the set should work after a fuse replacement. But here, the fuse blow up again, means, there is some thing shorted component/s. Check which component is shorted, and replace it, before replacing an other fuse. One more thing to say is, never insert a fuse other than specified. The voltage and ampere specification to fuse, will be marked at the circuit board, very near to the fuse clamp. Insert a fuse of same rating only. Using other fuse, rated higher ampere rating, might make things worse.

you obviously have a short to ground on one of the wires to the back (if it was the front the brake shouldn't blow the fuse). the most common problem is usually in a trailer light harness. if you look under the drivers side rear of the truck, down under the tail light there will be a plugin junction. pull this plug-in apart and see if the fuse still blows. if it does then the problem is forward of that connector, if it doesn't then the problem is behind that plugin. be sure to check for "green death" (electrical corrosion) at all joints especially any trailer hook ups.

Did your check your horizontal output of the crt neat the flyback or high voltage transformer.

I would suggest replacing the board itself, chances are what caused those fuses to blow is still faulty. did you check those fuses again after you powered it back up?

Go back recheck everything 6amp fuse in middle of power supply board that will blow, also solder everything that looks like poor connection pioneer always has a lot of cold solder jionts.CK all pico fuses they are green,yellow look like resistors but are fuses.

Protection cutting in can be caused by many different things, at least half a dozen.

Most of the time on a Mit, this is caused by the conv sys blowing a fuse that operates it, which is the same power supply that keeps the unit on. When that fuse blows, the voltage from the power supply that keeps the set on disappears.

The 5A fuses that keep the plus and minus 24v rails going are little green things that look like resistors, but are actually "IC protectors". They can be replaced by regular 5A fast blow fuses, GMA type (also known as F type - small, and hopefully pigtail, for soldering to the bad fuses. Parallell one or both of them onto the blown little green things after testing each with a VOM, which can be done easily in circuit while the unit is unplugged.

If either of those 5A fuses are blown, chances are you'll need to replace their conv ICs as well.

Mit's will work with their conv ICs disco'd - you'll have no conv correction, but the set will work and you'll see an uncorrected picture. At that point it's a shoe-in that the conv ICs are bad and need to be replaced.


Mr Bob
www.imageperfection.com

sounds like you got a short try tracing harness to see if theres anything visible

I would suggest taking a look at the power module if that can be replaced. The Fuse blowing may have only been the beginning of the problem. Any recent issues with under or over voltage in your home?