Set would not power up found blown fuse 1.25amp pos.1452.I replaced the fuse set still will not power up, but the fuse does not blow again. I do not have the service manual, any ideas what else may be in line with that fuse that could have blown.
You pasted the test. The coil is a horz. driver it is replaced with a kit from philips the part # 483531057673. You can buy this kit from MCM for about 12.00 bucks. you need the right tools you have to replace a surface mount transitor that comes in the kit.
The 1,25 Quick Blow Fuse, is in series with a mains harmonic coil (looks like a small transformer on a separate board next to the main board, but with only two wires, running to the main power supply board, connector is next to this fuse).
It just blew in our Philips 32PW8608...
This should not be replaced with a 4 Amp Time Delay (Slow Blow) Fuse!
The 4 A TD Fuse is only for the input fuse (next to the connector from the Front Panel Power Switch).
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If your able to remove the back and see if the main fuse on the power board is blown, if it is replace it and see if it blows it again, if it does you have issues with the hot side of the power board, unless your fairly familiar with electronics you may want to replace the board, they can be found on ebay or shopjimmy...If you don't see a blown fuse your going to need a multi meter to do some tests to figure out what board is bad, as it could be main or power supply making the set dead
It might be the over-voltage protection device. Replace it. It is an MOV, can be bought from most of the electronic spare part selling shops at your town. Check the rectifier diodes too. Replace it if found faulty. Check the fuse. It might be blown up. If fuse is blown up, replace it with same rating, and just try to switch ON the set. Even though the protection device stated above is absent, if there is no other fault, the set must switch ON. If the replaced fuse also blow off, as soon as you switch ON the set, make sure that there is some other fault too, and never put an other fuse in place and check. It might make things worse. If so, contact any service technician.To
get more details, http://electronicshelponline.blogspot.com/
Hello Check the power supply regulator board inside. It has a fuse [ a glass cartridge type, replacable] on it. Check it for blown out. If found blown up, replace the fuse with same size and ratings. its ratings will be marked on it. If the newly inserted fuse blows off too, as soon as you switch the Set ON, never replace an other one in place, as it will damage more components. make sure that the present power baord has some shorted component/s on it. It will be best to replace power regualtor boards as card basis, as components on it will be very hard to get from electonic spare part selling shops.
Hello Open your TV and chekc whether the fuse in the power supply board has blown out or not. If it has blown out, never replace it with same type; befor troublshoot the reason for the blown out for the fuse. There must be some reason for the fuse to blow out. Without rectifying it, if you replace it with a new fuse, it may cause more damage to the set. The power supply board to your TV will look like this.
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
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.
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.