The part number in the set is 6870qzc004a, does the part number you supplied interchange with this one? Question: what actually pops on this board, I looked it over and all seems ok, unless its one of the IC's under the heat sinks. Thanks AJ
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Re: vizio on the fritz
Yes it it is the sub part. It is the IC's that pop the way to prove this is to measure the voltage to this board Vs, VE, Vsus, and Va these voltages are listed on the panel. if any are low unplug the the connector from the power suppy reapply power and check the voltages again. if they return then it is the board that was unpluged. if not replug the connector and unplug the connector that goes to the Y main board and check again. be sure to remove power each time you unplug and replug the connectors.
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l suspect power supply board has failed---someone would have to open and check all voltage going in and out of the board----if outs are missing (any) the board would have to be replaced.
If you get it open examine the filter caps on the power supply board to see if any are puffed up on top---the tops are silver and should be perfectly flat with no brown material leaking out at top or bottom.
I suspect based on description a component (likely a big IC) failed and they are usually covered with a metal heat sink (plate) so cannot be actually seen---they pop and dead set. Typical filter cap (capacitor)
Switch mode power supplies are sensitive to power levels. At this point there is a problem in the power supply. Most likely a number of capacitors have become defective. Without seeing the set and taking measurements inside, it will be difficult to determine the exact fault. I would suggest that you get a detailed repair estimate from a local repair shop. Post the results here and we should be able to guide you through the actual repair.
If it is the main fuse that is being smoked, there are a number of possibilities:
1) Since this is a CRT based set, the most common failure os of the horizontal output transistor. This goes shorted which causes too much current draw on the power supply and it pops hte fuse.
2) The switch mode power supply transistor has shorted.
3) Failure of the primary side capacitor.
Without seeing the set and taking some internal measurements, I can not state for sure the exact problem with your set. Since there are potentially dangerous high voltages present inside even when unplugged, I would suggest that you get a detailed repair estimate from a local service shop and post the results here. We may be able to walk you through the actual repair.
I believe they are the voltage supplies for the TWO convergence IC's that this set uses(either STK-392-110 OR STK 392-150---THEY are interchangeable--but the 150 is a better device)
The easiest way to prove if this is your problem is to locate the two chips (black--2 1/2 inch wide X 1 1/2 inch tall with the STK number printed on them IN WHITE)
If someone unsolders all 18 pins on each chip--see if the set will turn on with them out of the circuit (you do not have to remove them--just unsolder both---If the set comes on the convergence will be very bad but you will know one of the chips is bad.
Also if you look at all the resistors around them (most will have location number RK46 etc) see if any of them are discolored or burnt. You find a burnt resistor and it is a sure bet onE of the chips is bad.
BOTH CHIPS NEED TO BE REPLACED!
A pretty easy repair if you have good soldering skills and I can tell you what you will need to do the repair. If replacement of the chips fixes the set it just needs to be adjusted with the Hitachi remote and should not have this problem again for 5-8 years.
IF YOU HAVE QUESTIONS, do not hesitate to ask me---I am here to help people.
HELLO AND NO YOUR AMP SUPPLY IS'NT THE RIGHT AMOUNT YOUR CORD ONLY SUPPLIES 2.5 AND YOUR T.V. CALLS FOR 5.2 IT'LL RUN YOUR T.V. BUT THE REASON IT WONT WORK IS BECAUSE YOUR T.V. WILL PULL 5.2 AMPS AND YOUR CORD IS ONLY RATED FOR 2.5 IN TIME THE CORD WILL BURN OUT OR GET HOT AND CAUSE A POSSABLE FIRE.
ok the part numbers...
remember some components have numbers eg: CS42D3K4H when all you actually need is the 3k4 which is a resistor. look on the PCB there should be a company name or serial number try searching that with the parts number.