Question about Memorex MT1131 13" TV

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Blowing fuse I replaced the 4 amp fuse, but as soon as i hit the power button the fuse blows again. Any Ideas ?

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Check main filter capacitor, voltage regulator,diodes in bridge rectifier,HOT transistor, if everything ok, replace de transformer next to the fuse.

Posted on Dec 20, 2009

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Check for bad caps or diodes. Look for anything discolored or burned.

Posted on Dec 11, 2008

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Amp keeps blowing fuses


Blowing fuses, was caused by many thing.
Short of rectifier,resistor,elco,tube heater,tube pin, and also trafo itself (primary or secondary winding). It must check step by step.
CAUTION :
THIS IS HIGH VOLTAGE AREA.
RISK OF ELECTRIC SHOCK THAT CAN KILL.
DON'T DO THIS IF YOU ARE NOT TECHNICIAN OR NOT FAMILIAR WITH VACUM TUBE CIRCUIT. THE CIRCUIT MAY STILL CONTAINS ELECTRIC SHOCK EVEN IF IF THE AMP IS NOT POWER PLUGGED.


The simple steps (see picture) are:
  1. Disconnect all connection from secondary of power trafo (PLV,PDCH,PACH and PHV).
    Power ON the amp. If fuse is not blowing,trafo is good.
  2. Power OFF the amp. Unplug the cord.
    Connect PLV1-PLV2-PLV3 (this are Bias voltage,+/-15VDC and Backlight PCB voltage) to power trafo.Power ON the amp. If fuse is not blowing,PLV circuit is good.If fuse blowing,there are parts is damage (dioda,elco,7815/7915,resistor) in this PLV circuit.
  3. If step 2 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV circuit stay connected,connect PDCH 1-2 and PACH 1-2 to power trafo. Power ON the amp.
    If fuse is not blowing,PDCH and PACH circuit is good and all tubes heater/filaments are lights after a few seconds.
    If fuse blowing,there are parts is damage (dioda,elco,tube heater pins) in this PDCH/PACH circuit.
  4. If step 3 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV,PDCH,PACH circuit stay connected,connect PHV 1-2 to power trafo.
    Power ON the amp. CAUTION: HIGH VOLTAGE AREA is ON.
    If fuse is not blowing,PHV circuit is good.
    If fuse blowing,there are parts is damage (dioda,elco,tube pins) in this PHV circuit.
.amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-0.jpg
Notes:
  • Steps had to be done sequentially from 1 to 4, not upside down.
  • If tube/heater pin is short,it can't be repair. The tube must be replacing.
  • PDCH circuit is voltage for V1-2-3-4 heater/filaments.
  • PACH circuit is voltage for V5-6-7 heater/filaments.
  • Always replace fuse with same type.

amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-1.jpg

Oct 02, 2015 | Peavey 6505 Plus 120W Guitar Amp Head

1 Answer

Fuse keeps blowing


Once a fuse blows & you replace it-- ONE Time--
then you stop

You go to wiring diagrams of the circuit with the
blown fuse & start your testing

Aug 11, 2014 | 1994 GMC Sonoma

1 Answer

6 amp power board fuse blow when power button pressed.


That is usually caused by shorted output transistors. What brand/model do you have?

Apr 29, 2013 | Audio Players & Recorders

1 Answer

Can a bad voltage regulator cause the main 30 amp fuse to blow?


Usually a bad regulator will only cause problems with charging...
Sounds like you've got a short somewhere in the wiring...I'd start by checking the ignition switch wiring and the connections going into the fuse box.

Mar 19, 2012 | kawasaki VN 1500 Vulcan Classic...

1 Answer

I keep blowing fuses when I try to start my 883. After tracing wires I can't find a dead short anywhere. All the lights and horn work fine. Only when I hit the start switch does it POP. I have checked...


Do not put a bigger fuse in the slot. If you do, you'll just burn up your wiring harness. A fuse is there to protect the wires. The fuse does this by blowing if the maximum current capacity of the WIRE it's protecting is exceeded. If it's blowing the fuse ONLY when you press the start button, it's in that circuit somewhere. I'd pull the starter relay and try it again. The relay is on the backside of the oil tank. You'll have to take the seat off to get to it. If it blows a fuse then, the problem has to be in the wire that comes from the start button going to the relay. If it does not blow the fuse, buy an new relay and install that. If it starts blowing the fuse again, you'll have to look at the schematic and find out where the wires go and trace them out. If you aren't getting any voltage at the blue wire, pull the relay and do a continuity check from the end of the wire where it plugs onto the starter and the frame. Pull the wire off the terminal on the starter and test it. If you have continuity, you have a short somewhere in that wire. Contact me directly at wd4ity@bellsouth.net and I'll send you a schematic. Remind me of what you need.

Good Look
Steve

Jun 27, 2011 | 1993 Harley Davidson XLH Sportster 883

1 Answer

So i hooked up the amp useing the pre-existing 8 gauge wire with a 30 amp fuse it worked for about and hour and started blowing the 30 amp line fuse. i replaced the line from 8 to 4 gauge and installed an...


this sound like a case of arcing power wire it happens very very easy if u use cheap wire especially from walmart. whatever u do keep using fuses and get a batt test asap. if u take out the fuses ull burn the amp like no other and plobably burn out the power rails which will be cheaper to buy a new amp after that

Oct 05, 2010 | Lanzar VIBE266 Car Audio Amplifier

1 Answer

Power amp for pa system stopped working


Sounds like you have a power supply problem in the amp. I am assuming the fuse you are replacing is intergraterd into the AC connection. You need to dig deeper. If you are not an electronics person you will need a tech.

Jul 02, 2010 | Phonic Power Pack 620 PA Package B-Stock...

1 Answer

Fuse Keeps Blowing


First off the reason for instant fuse blow is because this is a positive wire grounding out or touching/crossing a grounded surface. I would first target the Cig lighter outlet connections also if the outlet is rusty inside looking, replace it.

Jul 01, 2009 | 1994 Chevrolet K1500

1 Answer

Fuse blows


Both 3 or 4 amp slow blow fuses are suitable replacements for the 3.125 amp subwoofer fuse.

It could be that the subwoofer is blowing the fuse because the one you installed was not slow blow.

But, more likely is the subwoofer has a short in the power supply which is causing the fuse to blow.

May 31, 2009 | JBL PB10 Subwoofer

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