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I lost power on my TV (nothing else on the circuit). Is this a blown fuse?

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Correct!

Posted on Aug 08, 2008

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Just bought a used Toshiba TAC 9530. Owner said it worked. I plugged it in and have no power, no indicator light, nothing. Can anyone help or have I paid for a very large paper weight?


Hello,

A blown fuse is a very common type of fault due to poor design very often triggered by power surges due to outages or lightning storms. However, the most likely parts to short are easily tested, usually in-circuit, with an ohmmeter and then easily removed to confirm.

Note that it *may be* useful to replace a fuse the *first* time it blows (though it would be better to do some basic checks for shorted components first as there is a small chance that having a fuse blow the second time could result in additional damage which would further complicate the troubleshooting process). However, if the new one blows, there is a real problem and the only use in feeding the TV fuses will be to keep the fuse manufacturer in business!

Sometimes, a fuse will just die of old age or be zapped by a power surge that caused no damage to the rest of the TV. However, it must be an EXACT replacement (including slo-blow if that is what was there originally). Else, there could be safety issues (e.g., fire hazard or equipment damage from too large a current rating) or you could be chasing a non-existent problem (e.g., if the new fuse is not slo-blow and is blown by the degauss circuit inrush current but nothing is actually wrong).

If the fuse really blows absolutely instantly with no indication that the circuits are function whenever the TV is turned on.

May 30, 2010 | Projection Televisions

1 Answer

I have a Hitachi, 42 in. plasma ultravision and this morning I could not turn the tv on. No power.


check the branch circuit of your convenience outlet..the circuit breaker may have tripped..try to connect other appliance to the outlet where your TV is connected..this is to ensure there's power in it..if you are certain then that there's indeed power from the outlet you are sure that the TV is not working..check TV fuse and replace if blown..check resistance between the plug terminals after fuse replacement..if resistance is low, change voltage dependent resistor (VDR) with same value..it is a disk type resistor that looks like a big ceramic capacitor located just after the fuse..either blue,black or red.blown fuse may be due to power surge during the night..

Jul 17, 2009 | Projection Televisions

2 Answers

Tv dead power through on/off switch


yes there is a fuse.that is located on the main board.and that fuse is mostly blown and needs to be replaced. you can get new fuse at  www.radioshack.com at the rate of $2.

May 05, 2009 | Projection Televisions

1 Answer

Has sound but no picture screen completely black


If the TV is maintaining power but not displaying a picture or an onscreen display, there is a problem with a video board and it tend to be a capacitor problem and nothing to do with a fuse.  A fuse usually completes the internal circuit and if it were blown, you wouldn't have any power at all.  In any case, service is required as even a fuse is not usually serviceable by the owner on these newer TV's.

Mar 24, 2009 | Projection Televisions

1 Answer

No power to tv


The power management and protection circuits have taken over. There is something taking too much current and the protection system has shut the system OFF to prevent further damage ...............if you are familiar with tv service you can check the main fuse that should be close to where the power cord comes in,if you find the fuse blown it needs to be replaced with an exact replacement for AMPS rating and VOLTS rating as well as size,if the fuse is blown black we might have more problems ahead in the circuit and it will blow up again as soon as you plug the tv back in,if it blows again it will need a more involved repair,the problem could be in the primary side of the power supply.......Check horizontal output transistor.............

Feb 04, 2009 | RCA HD52W59 HDTV Projection Television

3 Answers

Toshiba 57H81 Flashing Red Power Light, Blown Fused F850+F852


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.
  • Some solder. Already owned de-soldering tools, etc.
  • Visited both local authorized Toshiba factory service repair facilities. One said repair would have to include replacing Q751 + Q752 STK392-110 Convergence Amps with ST392-180, and realigning set for a total of $500+ and it would be more if they had to order a power board. NO THANK YOU! Other shop said $65 for site visit and $30 to make an estimate that could be applied to repair.

Jan 04, 2009 | Toshiba 57H81 57" Rear Projection...

1 Answer

Green indicator light flicks about 3-5 times


The power supply has likely detected a short circuit. Hold the front panel INPUT and MENU buttons down for 5 seconds then read the code from the green light. If the light flashes a 2-2 code (2 flashes, followed by a 1/2 second pause, followed by 2 flashes) then pico fuses are blown. A 1-2 code indicates that nothing is wrong. The likely cause for blown pico fuses (FA904 & FA905) is a bad convergence driver IC. The PC board must be resoldered to replace the ICs and fuses.

Aug 09, 2008 | Mitsubishi WS-65807 65" Rear Projection...

1 Answer

Hitachi 60ux54b/55k--no sound


For starters, remove the back cover and turn on the TV. You should see 8 green LEDs on the circuit board.

You may have lost power for the audio amplifiers.

Jul 26, 2008 | Hitachi 60UX54B/55K 60" Rear Projection...

1 Answer

When t.v. is turned on, black picture and no sound.


Usually when the fuse blows its due to a component being shorted and if you increase the rating of the fuse you can cause other components in the circuit to blow. The pop you hear was most like a capacitor on the D board. The D board is no longer available from sony as its listed as discontinued. You will most likely have to have a qualified sony service tech trouble shoot the circuits on the D board to locate the short as it will be outside the scope of a do it yourself type of repair

May 16, 2008 | Sony KP-61HS10 61" Rear Projection...

1 Answer

My TV does not turn on I have a Mitszubushi 60 Inch


The first thing to do is check the outlet that it is plugged into.
Do you have a gfci outlet that may have tripped?
Sometimes the whole circuit that the tv happens to be plugged into may have tripped at the electric panel.
Chek for a blown fuse or tripped circuit breaker.
If that is ok, check inside the tv for a blown fuse close to where the power cord is attached.
If still no power, then it will take a checking of the power supply/power circuit board, which may be something a service person should check into.

Apr 08, 2008 | Projection Televisions

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