Question about Toshiba 65HM167 65" Projection Television

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65" projection toshiba power fuse blows

The power fuse keeps blowing when we connect it to the cable for the satellite. We have tried a 7 amp fuse and a 6.3 amp fuse. Both keep blowing when the cable comes in contact with the television. The cable works fine with other televisions so the cable is not the problem. What could be wrong with the TV?

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  • Toshiba Master
  • 14,553 Answers

You have a dangerous situation here---All modern units (Lamps, TV's, everything) Have a polarized power cord---one side of plug the pin is smaller than other side.

The large side goes to the neutral side of the electrical outlet.

One of two things has happened---either a issue with the electrical outlet which is rather rare except in older houses that have the old style electrical outlets (both pins the same size) Or someone has managed to get a cord in backwards--filed down the large lug on the power cord and put it in backwards.

What happens and can be tested is with it backwards you have "potential" 120 volts being fed back into the cable wire itself--

DO NOT KEEP CHANGING THE FUSE--a simple test with a voltmeter set to AC (wall) voltage from a earth ground (water pipe of metal will show 120 volts on the coax.

The touchy part is any set in the house misconnected can feed this back via the coax!

The cable company may be able to help or NOT> an electrician will be able.

The way I would locate this is with the volt meter hooked to the coax I would disconnect the cable feed from each set or unit in the house one at a time until no voltage reading---then you would know which is causing this issue.

Be advised it can spark which can destroy parts in any of the sets or equipment.

Kind of like if you got shocked when you touched the metal on your car.....something bad is happening.

Please if need ANY help comment here and I will assist.


Posted on Dec 03, 2012

  • Angela 'Hamby' Byers
    Angela 'Hamby' Byers Dec 04, 2012

    What if the power cord in the back of the TV got switched around? Would all connections put out a spark such as the DVD player, VCR, Blue ray? Because only the satellite receiver is the one we have issues with. The TV repair guy noticed an issue with what you said. When he switched the cord around the voltage went down. The only thing is that when connected to the satellite receiver it throws a spark and reads 120 volts. When connected to all other items there is no spark and reads only 60 volts. I ordered a new receiver to see if this is the case. I will comment back when I do find out if it is the receiver or TV. Thank You! You hit the nail on the head with what I was told yesterday!

  • Angela 'Hamby' Byers
    Angela 'Hamby' Byers Dec 07, 2012

    Ok I got the new receiver and it still reads at 120V and when touched to the back of the TV throws a spark. So...it is not the receiver. If the TV has an issue with the polarized power cord how could this have happened? and is it fixable? The cord is on properly. The black is on the black side and white on white.

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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:
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    Power ON the amp. If fuse is not blowing,trafo is good.
  2. Power OFF the amp. Unplug the cord.
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  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

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Solved by resoldering some solder joints!!!!!!!
********
Toshiba Model 57H81 Rear Projection TV - Purchased 11-09-2001

Problem: Toshiba 57H81 Flashing Red Power Light, No Picture/Sound, Blown Fuses F850 + F852

Symptoms January, 2009:

  • Upon turning on set I got flashing red power light and nothing else.
  • Removing plug for one minute and plugging in results in:
    • Audible click, steady red power light for 2 seconds then slow flashing red light
    • Pushing power button results in steady red for about 2 seconds then slow flashing red light, no other set activity
  • Removing power cord for several hours and plugging back in made no change
    • Audible click, steady red for about 2 seconds then slow flashing red light
  • Possible related note: Over past several months occasionally the entire screen would flicker momentarily and at other times be problem free for weeks.
  • Fuses F850 and F852 found blown

Repairs Made:
  • PD0074 DEF/CON Power Board
    • There are two main power supply capacitors in this set. They are C-809 and C-810. One their negative lead on the printed circuit board re-soldered leads and nearby contacts. I’m told that because the factory left out a printed circuit board eyelet, the connection will come loose over time. When I called Toshiba customer service they said there was a known solder joint problem causing blinking red light.
    • Replaced blown fuses F850 and F852.
      • I actually installed a fuse panel on the inside of the cabinet and routed the fuse connections here instead of ordering the special fuses and replacing them on the circuit board.
      • Had to use a 5 Amp SLO-BLOW for F850. Fast blow does not survive power up. Get the red blinking light.
      • Used a fast blow 2 Amp for F852.
  • PD0073 SIGNAL Board
    • Re-soldered Q751 + Q752 STK392-110 Convergence Amps
    • Re-soldered adjacent pads that looks suspicious

Total Cost to Repair about $10
  • Twelve hours of my time over three days to research issue, disassemble set, make repairs, add fuse panel.
  • Already owned Service Manual and Circuit diagrams from a different 2004 repair.
  • Less than ten dollars at Radio Shack for fuses and fuse panel. Already had wires, etc.
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