vizio vp50

[heavymachines]

Okay i looked and looked and looked not getting clues to this tv problem that i can find.... I am pretty sure this set power board has been recapped because there is only one samwha 450v 22uf cap the rest is rubycons and samxon and all the samxon ones were in place of what used to be samwha after looking all over and found budm photbucket online of this very same set and i am certain it was samwha's could be wrong not 100% certain...anyways there is no bulging caps that i can find and ones i pulled are within good tolerances...but when powered on i get sound and no image and relay clicks and the mainboard does respond to power button and i get good VS 207 volts however there is only 6 to 7 volts and sometimes 14 volts on VA and once in a while i get this high pitched whine from the power board and it will get higher and higher pitched till you can't hear it no more at one point i swear i smelled something burning but i can not find anything burned.......i tried the set with its buffers and x and y disconnected and still do not get any VA voltage the upper and lower buffers look good althou i have not done a short test on it yet mainly because i need to get va voltage working first...any idea's ?



BTW the power board model number is pspf561a01a and made by samsung

[heavymachines]

Re: vizio vp50

And all fuses are good.....

[tom66]

Re: vizio vp50

Please PLEASE add paragraphs next time. Try reading that wall of text, really hard to.

Anyway, dark room, any glow on screen at all?

[heavymachines]

Re: vizio vp50

sorry man my bad....i will have to wait till tomorrow to do that test...i have the power board with me at home and is there any other test i can do till i get to work to do the dark room test?

[tom66]

Re: vizio vp50

Unplug the VA connector on the Y-SUS and Z-SUS, bottom of each board.
Do not reconnect this while the TV is on or the panel will fry.
Check VA when disconnected to see if it is good.

[heavymachines]

Re: vizio vp50

Unplug the VA connector on the Y-SUS and Z-SUS, bottom of each board.
Do not reconnect this while the TV is on or the panel will fry.
Check VA when disconnected to see if it is good.

i know well enough not to hot plug anything pdp ...i already did the test with y-sus and z-sus disconnected and still get no va voltage it was stated in my "wall" of text lol except i called it x and y er z whatever lol different companies call them different names but same thing pretty much...


had both disconnected still no va i say it safe to assume its a problem on power board....correct?

[tom66]

Re: vizio vp50

That woul be my guess.

[heavymachines]

Re: vizio vp50

maybe this is a clue i let the power board sit disconnected over night on bench picked it up and got a hell of a shock felt stronger then getting shocked by 120 ac volts....


so it does not drain like it should i think,,, so what i do now is use a ceramic resistor to drain each big boy caps to prevent that from happening again.....and now i carry it by the edges........

[heavymachines]

Re: vizio vp50

That woul be my guess.

see i have not forgotten what you have schooled me before....i have learned much from you and budm and others... but will try whatever you suggest...

[heavymachines]

Re: vizio vp50

see i have not forgotten what you have schooled me before....i have learned much from you and budm and others... but will try whatever you suggest...

but $100 for the power board is rich for my blood rather fix it ...it can't be anything serious cause the VS works just the VA is wonky...6 to 14 volts it bounces around i do have a esr meter and it works good already helped me with another tv and computer stuff takes the guess work out...however this power board is a weird one to me in theory i think it may have a bad regulator...but i am not a expert just a theory gonna hunt for schematics...

[tom66]

Re: vizio vp50

Clean Va pot.
Also, pictures would be a blessing upon this thread, so we know what we are dealing with.

[heavymachines]

Re: vizio vp50

Here is it note where i marked 1,2,3 where the blue box capacitor is missing had a 42" vizio not work due to one of them being bad replaced one box and a regulator fixed the problem but this one is not burnt and esr shows 3.0 on the 2 470n k 275v and on the 220n k 275v shows 7.0 on esr i think it high but no sheet to know for sure ...on the 42 inch i worked on it was obvious because it was burnt....

[heavymachines]

Re: vizio vp50

Clean Va pot.
Also, pictures would be a blessing upon this thread, so we know what we are dealing with.

i will have to get some contact cleaner from rat shack in morning...

[heavymachines]

Re: vizio vp50

better image of same board...

[heavymachines]

Re: vizio vp50

also want to note when powered up no green led but it still puts out VS voltages just no VA er too little voltage suppose to be 63v

[heavymachines]

Re: vizio vp50

Please PLEASE add paragraphs next time. Try reading that wall of text, really hard to.

Anyway, dark room, any glow on screen at all?

no glow whatsoever both sustin boards stay cold and on power board only the middle heatsink gets warm the other 2 on each side stay cold as well, i think i may have spotted 2 burnt resistors on the y sustin and surface temps almost reach 100 degrees f on those resistors and the bands are very hard to read...



i am starting to wonder if it went from buffers going bad to y sustin then killing the VA voltage on power board...just a wild speculation on my part at this point....


i do not understand why the resistors get hot but the heat sink stays cold on the y sustin beats me at this point...and the resistors are right next to the upper and lower buffers....and i cannot find schematics yet still looking....

[heavymachines]

Re: vizio vp50

Clean Va pot.
Also, pictures would be a blessing upon this thread, so we know what we are dealing with.

got some contact cleaner from rat shack and wow expensive $16.00 bucks a can....anyways it made no diffrence whatsoever i spayed and worked the pots back and forth and reset voltage for vs back to 207 volts tried adjusting va does nothing......

[heavymachines]

Re: vizio vp50

Here is it note where i marked 1,2,3 where the blue box capacitor is missing had a 42" vizio not work due to one of them being bad replaced one box and a regulator fixed the problem but this one is not burnt and esr shows 3.0 on the 2 470n k 275v and on the 220n k 275v shows 7.0 on esr i think it high but no sheet to know for sure ...on the 42 inch i worked on it was obvious because it was burnt....

and i apologize for the pics it all i got don't have access to a real camera....

[tom66]

Re: vizio vp50

Check all board fuses.
Inspect the Va transformer area (third from top.)
Consider replacement of TL431 feedback IC.

[heavymachines]

Re: vizio vp50

my bad resistor on on y sustin
r5600
r5610
the color bands are extremely hard to see the thing is almost black with little bit of tar looking residue at bottom of it's pegs dunno if i should be alarmed about it but the bands are very very hard to tell what color it was to be able to figure out it's value...



got my hands on better camera so hope this helps... well little bit better...not perfect...