Dead Vestel 17IPS71 power board

[budm]

Re: Dead Vestel 17IPS71 power board

I have this same Psu in another Tv which I will be taking a look at tomorrow. So will get reading then with the same Psu. That wont be till about 4pm tomorrow when I finish college and have a look at that set though.

Great, that will give us some idea as to what the resistance readings should be to see if we are in the right path.

[london-freddie]

Re: Dead Vestel 17IPS71 power board

no meter does not have cap test
are we saying change IC U202 FAN6300

[ReeceyBurger123]

Re: Dead Vestel 17IPS71 power board

I have this same Psu in another Tv which I will be taking a look at tomorrow. So will get reading then with the same Psu. That wont be till about 4pm tomorrow when I finish college and have a look at that set though.

[budm]

Re: Dead Vestel 17IPS71 power board

I would be suspicious of C296 a 1uF 50V smd capacitor? London-Freddie does your meter have a capacitance checker so you can test it?

He can try removing that MLCC cap which is in parallel the Lytics cap for filtering the Voltage on the VDD pin and see.

[budm]

Re: Dead Vestel 17IPS71 power board

@reece, do you have any of the Vestel board that uses the 6300 IC that may be you can try taking some resistance measurement on?

[dick_barton]

Re: Dead Vestel 17IPS71 power board

I would be suspicious of C296 a 1uF 50V smd capacitor? London-Freddie does your meter have a capacitance checker so you can test it?

[dick_barton]

Re: Dead Vestel 17IPS71 power board

I to would agree at this point. Nothing to lose changing it, but everything to gain.

[ReeceyBurger123]

Re: Dead Vestel 17IPS71 power board

Im just going to throw my 2 pence in. Dont give up on this, keep following Buds advise. It will work out just keep trying. I want to see this work out.

[budm]

Re: Dead Vestel 17IPS71 power board

VDD to GND same 192 in diode mode

That is what I thought.
I say replace the IC unless some one has other suggestions.

[london-freddie]

Re: Dead Vestel 17IPS71 power board

VDD to GND same 192 in diode mode

[budm]

Re: Dead Vestel 17IPS71 power board

I am talking about the diode mode reading between VDD and GND pin of the IC.
At this point I suspect bad IC.

[london-freddie]

Re: Dead Vestel 17IPS71 power board

have already soldered back R301 but diode did read in one direction only when resistor R301 was removed

[budm]

Re: Dead Vestel 17IPS71 power board

Now, are you getting about the same reading in diode mode if you measure between VDD and GND pin without the resistor in place, try it both ways with the probes?

[london-freddie]

Re: Dead Vestel 17IPS71 power board

D20 is ok

[budm]

Re: Dead Vestel 17IPS71 power board

BTW, instead of removing the SMD D20, remove the 0 Ohm resistor R301 instead since it is basically a jumper and then you can test the diode on board.

[budm]

Re: Dead Vestel 17IPS71 power board

If the reading does not look right then remove and test it off the board.

[london-freddie]

Re: Dead Vestel 17IPS71 power board

R301 seems ok, however not sure of diode D20, diode mode set on meter it is reading .194 in both directions, is that right ?

[dick_barton]

Re: Dead Vestel 17IPS71 power board

Also check the diode alongside it D20 and R301 also capacitors C295, C296, C302

Edit
Just taken another look at the photo of the back of the board and it looks as though C295 and C302 are not fitted but C296 is fitted.

[london-freddie]

Re: Dead Vestel 17IPS71 power board

VDD to GND .009V

[london-freddie]

Re: Dead Vestel 17IPS71 power board

just changed c33/73 will check VDD pin again now