need help with caps on a plasma tv power supply board

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

ill be on the pc at the same time as doing all of this so ill refresh regularly and update

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

ok so i just checked P11 on 20DVC it reads 0.00 untill i press the power button and then it jumps between (depending on how many times i click and if i hold the power button) 1.16-6.50v and after that it will settle at 1.00 untill the 3rd click after 15 sec anf it will slowly decrease to 0.00

i tested the SN2 on a 200k and 20k ohm and its showing a short 0.00

just tested P6 and from top to bottom i get (on a 20DCV)
15Vs= 1.16-6.50 (same as P11) untill the relays click then it goes to 0.00
GND= good
15Vc= 1.16-6.50 same as above fades after last click
GND= good
F15V= 15.74 fades after the last click to 0.00
F15V= 15.75 fades after the last click to 0.00
GND= good
GND= good
F-STBY-on= 2.95 jumps down to 0.00 after last click
STBY5V= 4.96 untill i click power then drops to 4.29 then back up to 4.96
STBY5V-ON= 0.02 I click power it jumps to 1.01 then back to 0.02
SOS4-PS= 0.00 to 0.17 after power button click
SO= 0.00 no change at all
S1= 0.00 no change at all
1= 3.01 with first relay click after the second it drops to 0.00 after the last click 0.00

All of this testing was done on a 20DVC scale

these tests were done with a 2ok ohm setting

ss11= open no short
p11= 8.50-8.51 after 30 sec of connection
SN2= 0.00 shorted
P2= 0.00 shorted (damn)
P9= not shorted open


P35 this will be tested from left to right numbered from 1-4 and tested on a 20DCV scale

1= 4.47v untill final click then 0.00
2= 0.00 shorted
3= 2.89 drops to 0.95 and hold untill final click then 0.00
4= 3.79 drops to 0.95 and hold untill final click then 0.00

now ill test p35 on a 20k ohm scale
1= 0.00 untill i push power then goes to 0.02 then after last click 0.00
2= open no short no change
3= had to switch to a 200k scale maxxed out the 20k) 22.5 after 1 min on 200k ohm
4= 21.9 on 200k ohm after 30 sec


so what does all this mean? ive tested about everything i can i even tested to see if all of the cables in between the boards were shorted and found none that were

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

no one?

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

update on a 20k ohm scale the P2 connection jumps from 7.16 to 0.02 then to 0.01-0.00

does this mean its shorted? it only happens right as i plug the leads into the connector

[selldoor]

Re: need help with caps on a plasma tv power supply board

I think we are just waiting for you to blow yourself up! I know nothing about plasmas but here are a couple of general electronic rules.
NEVER replace a high voltage cap with a lower voltage cap ( Unless you know what you are doing or you are happy to trust someone advising you)

ONLY EVER test resistances with the power off and the machine unplugged for at least 15 minutes.
No-ONE will ever tell you to do a resistance test with the power on. You are probably doing more damage as you go on.

And another

Do Not plug unplug leads with the power on


.

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

the only way to test voltages from what i understand is to have power to the set,

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

ok so right now im replacing the 50v cap with a 450 300uf cap and seeing if it powers the tv up

[selldoor]

Re: need help with caps on a plasma tv power supply board

the only way to test voltages from what i understand is to have power to the set,

Correct - However I am referring to this

now ill test p35 on a 20k ohm scale
1= 0.00 untill i push power then goes to 0.02 then after last click 0.00
2= open no short no change
3= had to switch to a 200k scale maxxed out the 20k) 22.5 after 1 min on 200k ohm
4= 21.9 on 200k ohm after 30 sec

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

i replaced that cap and the tv will act like it wants to power up no audio no video, red light comes on about 15 to 30 sec later it shuts off, no blinks no nothing, where do i go from here?

i tested the P2 connection again with the plug connected, testing on the vsus prong with the red lead and the black to ground i get 0 ohm with the connection unplugged and reading the same vsus prong to ground i get 93.7 on a 200k ohm scale,

so its looking like my SN board is bad?? my question is why arent i getting blinks anymore?

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

ah i see what youre saying selldoor, better safe then sorry, ill be more careful from now on

[tw2005]

Re: need help with caps on a plasma tv power supply board

i replaced that cap and the tv will act like it wants to power up no audio no video, red light comes on about 15 to 30 sec later it shuts off, no blinks no nothing, where do i go from here?

i tested the P2 connection again with the plug connected, testing on the vsus prong with the red lead and the black to ground i get 0 ohm with the connection unplugged and reading the same vsus prong to ground i get 93.7 on a 200k ohm scale,

so its looking like my SN board is bad?? my question is why arent i getting blinks anymore?

So I would say you intial fault and 14 blink was most definitely shorted Vsus on the SN board. If you want to fix this, straight up you need one of those. As for no blinks anymore, no idea . Any chance we can get some photos uploaded of how it's all connected and any repair work you've done on the PSU.

If you connect everything up like it should be, but leave SN2 off, power the TV up and see if you can get a SOS.

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

i took a 6 min video of a test i did ill upload it to my youtube channel and post it and ill try what you said tw

[tw2005]

Re: need help with caps on a plasma tv power supply board

make sure you leave a thumbs down and remarks on that SJ video stating the procedure was wrong and you had a shorted SN board.

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

just tried unplugging the SN2 and no blinks, now im stuck

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

oh i will, i just hope i can find a sn board for a good price, but still no blinks, anything else i can unplug to get a blink?

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

how do i remove the fuses on the p board? going to check those next

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

could this be a problem???

[9302z28ss]

Re: need help with caps on a plasma tv power supply board

tw posted a pic of the tvs setup

and heres the video http://youtu.be/5YQ0YkY58oE

[tom66]

Re: need help with caps on a plasma tv power supply board

AC volts for mains measurement, if you had no AC in you would get no blinks.
Calm down, stop jumping ahead, follow tw's advice because it's confusing me and no doubt confusing him too

[selldoor]

Re: need help with caps on a plasma tv power supply board

could this be a problem???

I just dont get you at all????

Problem - Noooooooo Wayyyy

You have a meter with a flat battery which means any testing is likely to show incorrect results.
You test resistance with Power on
You replace caps irrespective of voltage.

Now you appear to have a meter set on 20vDC plugged into 120 AC.
I may be wrong - hopefully?