Dead Vestel 17IPS71 power board

[fnets]

Re: Dead Vestel 17IPS71 power board

[vinceroger69]

Re: Dead Vestel 17IPS71 power board

would this be safer? "could you measure the dc voltage on CN3-CN4 (black connector) with the mainboard disconnected and see if there is at least a standby voltage"? but not sure where to put the probes.

Sorry yes we all test things differently so i edited my last post im just going too look a schematic and will find test points.

[fnets]

Re: Dead Vestel 17IPS71 power board

you're probably much more capable than I am. can you also tell me which leads plug in and which to leave unplugged?

[vinceroger69]

Re: Dead Vestel 17IPS71 power board

plug all leads back in and screw the psu back down turn your tv on put your multi meter on dc volts then put the black probe on one of the psu mounting screws then with the red probe test the voltages on that connector are they numbered? pin 9 is 5v stby there are two rows of pins on that connector so maybe easier to push the red probe down the side of each wire where it goes into the connector it should read voltages ok doing it that way.

[fnets]

Re: Dead Vestel 17IPS71 power board

the black connector (above) has CN4 & CN3 on the right (but no pin 9)

[vinceroger69]

Re: Dead Vestel 17IPS71 power board

basically cn4 and cn3 means two different connectors can be fitted to that pcb yours is classed as cn4 if you cant find pin 9 for now just test all the voltages i have added a picture so you maybe able too work out pin 9

[fnets]

Re: Dead Vestel 17IPS71 power board

ok great, where is the picture?

[fnets]

Re: Dead Vestel 17IPS71 power board

ok yes I see the pins are on the side ...



do I need to put the black probe on ground?

[vinceroger69]

Re: Dead Vestel 17IPS71 power board

my guess its fith one down on the row you can get too.

[fnets]

Re: Dead Vestel 17IPS71 power board

back tomorrow. thank you very much.

[vinceroger69]

Re: Dead Vestel 17IPS71 power board

yes black probe on ground a mounting screw is the easiest

[fnets]

Re: Dead Vestel 17IPS71 power board

tested this morning. 240V AC going in and 0V DC going out on pin 9.

[fnets]

Re: Dead Vestel 17IPS71 power board

if possible I'd like to know how you word this correctly?

[vinceroger69]

Re: Dead Vestel 17IPS71 power board

do you get any voltage on any of the pins? of cn4

[fnets]

Re: Dead Vestel 17IPS71 power board

nothing, tried pins 1,3,5,7,9

sorry to cause confusion but I also started https://www.badcaps.net/forum/showth...064#post781064

[vinceroger69]

Re: Dead Vestel 17IPS71 power board

start from basics get a new battery a aa or 9v one and check your meters working fine on dc measurements i will have a look in the schematic while your testing that as i have not worked on one of these boards before

[fnets]

Re: Dead Vestel 17IPS71 power board

just tried on 1.5v "C" Duracell and meter ok on DC setting?

I also tried testing the diodes and I think they're ok (but this is the first time I've tested a diode).

the capacitors look ok but haven't tested them.

the TV wouldn't switch on and had no standby light.

[vinceroger69]

Re: Dead Vestel 17IPS71 power board

thats ok then start with page one of this thread and follow each step, my guess its the same ic thats failedin this thread, see how far you get and what voltages you get etc but if that ic has failed its probably why you are getting no voltages on that connector

[fnets]

Re: Dead Vestel 17IPS71 power board

ok thanks

[vinceroger69]

Re: Dead Vestel 17IPS71 power board

a common failure on these power supplies U202 FAN6300 SMPS IC if this ic is cheap enough and you can solder ok i would probably just change the ic but if i was fault finding this board i would just follow this thread step by step and see if it points too that ic being faulty.