JVC 56P575 no power

[rca2000]

They WILL work...GOOD pictures BTW.,..

You need to check that "whatcamacallit"..next to the "whatchmagieer" connected to the "thing a mig."!!

Ok SERIOUSLY now...

It looks as if you do NOT have a seperate standby power supply here ...so this means that the main SMPS runs at ALL times...or at least it is SUPPOSED to.

I see a relay on the COLD side--this is likely to switch off the B+ to the Horiz ckt--in standby. Also what looks like an "SE" voltage reference chip" this is for regulation..it is in front of the relay--looks lke a TO-220 transistor. But in standby...it MAY not have voltage on it--if it is switched through that relay..but likely the relay is AFTER that reference chip.

that large transformer is the SMPS power transformer. It powwrs the set. the VERY first thing you need to determine is...if it is even running at ALL.

If you can...turn over the chassis and get a voltage reading on that large capacitor behind the SMPS tranny. You need to see if there is at least 150 volts DC on it..ACROSS it's terminals. If it DOES have that on it..(and since you say you see a spark when you plug the set in---it likely DOES)...then you need to see if you are getting ANY voltages out of the power supply.

In front of the SMPS tranny...there are several capacitors with diodes near them. ALL of these diodes should have some sort of DC voltage on one side of them...as measured to chassis ground. LIkely 12 volts, maybe 24 volts, 18 volts and perhaps a 9 volt or 5 volt or so supply. A couple will likely shgow a negative voltage to ground--like -18 or maybe -24..

if you see voltages there....move over to the connectors that go over to the signal board (the green one on the left side of the power supply board)..and see how the voltages look on thaty connector. there MUST be at least a couple of voltages there in standby...a 12 volt or maybe a 5 volt supply. These power the MPU and remote ckts...to keep the set "alive". Ground the black probe and check and see what those connectors have on them. with the set off but plugged in...there likely will not be too many with voltages...but a FEW should have some voltages.

Your convergence chips are up front on the deflection board..STK 394-250..and do NOT go bad as often as others but they CAN go bad. But it is NOT likely they will totally kill the set. They likely are powered by an +18 or +24 and - source--from the SMPS supply. Just for "kicks"..unplug those three 4 wire connectors in fornt of STK chips...those are the convergence lines...(be SURE to label them in some way...to get them back to the RIGHT connecors..otherwise...when you DO get the set to run...the convergence will be WAY off. )

So....check this out...and we will go from there !!