lg 42pt85 no power standby lights up

[wreksta]

Re: lg 42pt85 no power standby lights up

tom I don't have acess to her camera atm as she got it packed away for her holiday

the diodees though they shouldn't have continuity

[tom66]

Re: lg 42pt85 no power standby lights up

Depends on the diode - outer two pins can be connected together on some designs. Part # of diodes?

[wreksta]

Re: lg 42pt85 no power standby lights up

right tom pictures as requested







tom this board is a YPSU-J014A REV 2.5

I HAVE A SMALL IDEA DUNNO IF YOU WILL AGREE OR NOT
I HAVE A WORKING PSU OUT OF THAT 42PX5D

CAN I WIRE THAT UP SO ALL CONNECTIONS ARE WIRED THE SAME WILL IT WORK

BECASU IN THEORY VS IS VS AND VA IS VA ETC

[tom66]

Re: lg 42pt85 no power standby lights up

Well, if and only if all the connections are identical.

[wreksta]

Re: lg 42pt85 no power standby lights up

I don't think they have same connectors but I can fathom al that out so the right connections go to the right connections#

anyways have the pictures helped mate I would like to try and repair this board tbh

[tom66]

Re: lg 42pt85 no power standby lights up

Part # on the "shorted" diode?

[wreksta]

Re: lg 42pt85 no power standby lights up

tom all thee parts show continuity

theres a mosfet marked
D612 ,D614

THEN THERES
DIODES
D151
D804

RESISTORS
R153
R154
R157
R802
R806
R861

THEN THERES A BIG DIODE LOOKING TYPE

MARKED EL63

[tom66]

Re: lg 42pt85 no power standby lights up

Part # as written on the device not the board.

[wreksta]

Re: lg 42pt85 no power standby lights up

tom can I not just remove the parts to find out if there shorted esp the diodes
parts are tiny so hard to get numbers

the mosfet type one d612,d614 is s20lc60us

[tom66]

Re: lg 42pt85 no power standby lights up

You can, but it's a lot more work than using a bright light and magnifying glass to read them. Or the macro mode on a camera + flash.

Those are probably TO220 type, not MOSFETs but in same package.
http://www.shindengen.co.jp/product_...20LC60US&id=81

You can see internal circuit, pins 1 and 3 are different diodes. On the board they will probably be joined together.

[wreksta]

Re: lg 42pt85 no power standby lights up

that's what I thought tom

so what about removing just those 2 diodes and testing them off board they should not be shorted off the board

[wreksta]

Re: lg 42pt85 no power standby lights up

tom just read through this thread

https://www.badcaps.net/forum/showth...ght=gtv&page=2

this fault is like mine
im going to check mosfets mate

will post all results soon

[wreksta]

Re: lg 42pt85 no power standby lights up

....................

[wreksta]

Re: lg 42pt85 no power standby lights up

this power board was replaced for a working one andnow tv wont fire up unless y main connector is disconnected then the standby light goes green and hard drive spins into lifeand tv stays on
but the thing is the xmain gets its power from the ymain ive checked fuses on both x and y any ideas

[tom66]

Re: lg 42pt85 no power standby lights up

Check from Vs to GND on Z-sus and Y-sus.

[wreksta]

Re: lg 42pt85 no power standby lights up

please explain that mate you lost me

[tom66]

Re: lg 42pt85 no power standby lights up

Resistance check - 200 ohm range or so. Readings around 0 ohms are bad.

[wreksta]

Re: lg 42pt85 no power standby lights up

so red in on vs and black on ground and meter on 200 ohms
do I test this on psu or the yboard or does it not matter

[tom66]

Re: lg 42pt85 no power standby lights up

You want to test on each of the suspect boards - Y-sus and Z-sus.

[wreksta]

Re: lg 42pt85 no power standby lights up

right tom jesus just removed x z board and the big black coil has burn marks underneath and on the pad it sits on
I disconnected the x from the y but I don't think the model will fire without both connected

going to have to replace this board before I can do anything mate