Power Light flashes 3 timesthen nothing. I took the back off and found the front left board with a blown component and a burned spot about 3 in in Diameter. a hole through the board about a 1/4 inch. Bardode sticker on PCB has the number: PSB-850 C019 18606 448612284. How can I replace this board. I went to a Tech school to learn how to repair TV's abot 10 yrs ago so am fairly comfortable with doing this just need to be able to find this board.
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Re: Blown Board inside TV
Is it the board with flyback or the green one with the small parts/// also on the label on the back of the tv there is a model number and then in smaller letter there is the model number plus some suffix numbers yx1 or somethig to effectd52w19yx1. thats important in determining part muber.
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It is 19 years old, and I would say beyond economical repair. You will be chasing blown components that were damaged when the power surge or brownout occurred. It is only a 42" set and it is plasma. Technology has moved on to 4K Ultra HD, LED and smart hubs. Treat yourself, it's Christmas :>)
have you checked for dry joints or blown capacitors , with a power surge depending what kind voltage or amperage the circuit received it might have even blown screen connect it will certainly fry a lot of components ,have you looked for holes in capacitors ,resistors or burnt tracks between components . that's about all I can think of to check also some power panels have built in fuses to stop surges if you could obtain a circuit diagram that should help you also you could google your query and see if you get any assistance it costs nothing and you could get your TV up and running again . All the best .
when the fuse always blown, it could be a shorted component at the power supply board or the main board was affected during lightning where in some of the component get burned then cause a shorted line.if you don't have an idea in any electronic repair just leave it to the trained technician to do the works. hope this can help you thanks for using the fixya.
Hi, You may have a circuit board problem. Make sure you have power to the unit first. If you can, get on the roof take the access panel off to the electrical components. Most carrier circ boards have a flashing light display on the board itself. On the back of the panel you just took off should be a kiosk that tells you what the flashing means. If the light is dead, no color but you are sure there is power to the unit, the board is bad or there could be a fuse blown on the board. Most circ board fuses are a small 3 or 5 amp blade fuse mounted right on the circ board. I have seen many a carrier board burn out because of lightning. I hope this is not the case for you, as carrier boards are just a little expensive. Hope this helps you get some air back. Mark
The T-CON board it is dying too.Must be replaced too.This T-CON board sit at the middle bottom of the LCD screen panel.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish T-CON board for the replacement.
If you are comfortable with working in tv circuit boards then unplug tv from AC wall socket, take off back of tv and follow AC cord going inside tv that will take you to power supply board, check fuse on power supply board, replace it with same rating written on it if it found blown. Replug tv back in wall socket and check if it turns On. If still problem not solved then power supply board is defective and need to be replaced. Local tv repair shop will help you if you think its not safe for you to work inside tv. Hope these info will help you. Thanks.
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.
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