Dead Vestel 17IPS71 power board

[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.

[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.

[dick_barton]

Re: Dead Vestel 17IPS71 power board

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

[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?

[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?

[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.

[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.

[london-freddie]

Re: Dead Vestel 17IPS71 power board

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

[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.

[ReeceyBurger123]

Re: Dead Vestel 17IPS71 power board

Just checking some that I have on hand now.

17IPS19 uses Fan 6724
17IPS11 uses Fan 6724
17IPS20 uses Fan 6724 on both switching transistors.

So will get the IPS71 out tomorrow and get a look. Hopefully it uses the same chip as all Vestels differentiate in the design.

[london-freddie]

Re: Dead Vestel 17IPS71 power board

can you point me in the direction of that MLCC cap to remove please

[dick_barton]

Re: Dead Vestel 17IPS71 power board

Here circled in red.

[dick_barton]

Re: Dead Vestel 17IPS71 power board

If that checks out OK then I would wait and see what information ReeceyBurger123 can offer you tomorrow.

[ReeceyBurger123]

Re: Dead Vestel 17IPS71 power board

Readings coming shortly.

[ReeceyBurger123]

Re: Dead Vestel 17IPS71 power board

Right heres what I have:

C262:

Across cap 465 ohms. To ground OL

U202 Fan 6300A nothing gives a reading to ground. VCC nothing to ground either on any pins meter set to several ohms measurements.

D20:

Black on cathode, red on anode:
476Mv drop

Red on cathode, black on anode:
OL

D298:

Black on cathode, red on anode:

087Mv drop

Red on cathode, black on anode:

OL

[ReeceyBurger123]

Re: Dead Vestel 17IPS71 power board

I would say your Smp Ic is probably faulty here. See what Bud and DB think.

[budm]

Re: Dead Vestel 17IPS71 power board

Just to be sure, So the resistance between the HV pin and GND pin is (OP was reading about 70K Ohms)? VDD pin and GND pin is (Op was reading about 2K Ohms)?

[dick_barton]

Re: Dead Vestel 17IPS71 power board

London-Freddie
You now need to do the same tests as ReeceyBurger123 has kindly done for you and post back the results.

[budm]

Re: Dead Vestel 17IPS71 power board

I have a hard time finding c262 in the diagram.
But from the readings Reece provided, it does look like bad IC at this point.

[ReeceyBurger123]

Re: Dead Vestel 17IPS71 power board

It might be hard Bud as they change the design every board. But yeah im thinking the Ic is bad, strange as normally when these Ic's fail in Vestels they blow up.