XL194-03...Replaced bulgy caps NO 24v from PSU

[scooby-doo]

All the caps were bulging, replaced....tv comes out of standby and I can hear static noise through the speakers, the set doesnt shut down, there is just no 24v from any of the pins on the psu I am getting 3v on the same connector block for the signal but thats my lot.

Any ideas people???

Thanks in advance.

[E Parton]

Not familiar with the set SD ...but Since elec caps were bulging ...now replaced ...and there is at least some invertor supply voltage ...I would back track from the connector ...and check any 24v supply diodes ...as this most likely (possibly a dual diode heatsink mounted)  ...would have took a clogging ...
best of luck
Evan

[E Parton]

OOps misread your post I think ..
the 3v isn't from the invertor supply ?
So s/c supply diodes still look favourite ..
but ...does the set actually come out of standby ...? in fact is there a standby supply at all ?
rgds
Evan

[Turnip]

Hi S/D,

Don't think you mentioned known make or model - gives some problems, esp with no piccies - Chris

[scooby-doo]

Yes set comes out of standby...it seems to be working all ok apart from the 24v supply.

Will trace backwards later today...I did think earlier that a couple of the box type caps were a bit on the podgey side...but thought I may get away with replacing the electrolytic's for it to fire up....obviously not

But thanks for your help Evan

Oh yes the 3v Supply is on the inverter supply block....

Hi Chris its a Goodmans GTVL32W27HDF

Picture of PSU attached

[E Parton]

Looks like you have a couple of those double diodes on the right of the photo ..
D2010 etc ..
Highly suspect in this case I think ..
Usually find only 1 of the 2 in the package is gone ...

Hence still providing a DC output ..but shunted by a leak one ..

rgds
Evan

[scooby-doo]

Nice one Evan spot on...D2010 sc'd

[scooby-doo]

Sorry...removed from circuit short is still on the board D2010 is ok out of circuit

[sparky]

hi
just a thought did you take the covers from the heat sinks
if you did they need to be put back on to complete circiut
dave

[scooby-doo]

Yes Dave left the heatsinks in situ...just removed the diode to check...and I am struggling to find this bloody short

[scooby-doo]

SCHOOL BOY ERROR WARNING 

I blame my blow torch and plumbers solder.....I got solder splatter on one of the smd capacitors and resistors and it was causing a short....

[E Parton]

SCHOOL BOY ERROR WARNING 

I blame my blow torch and plumbers solder.....I got solder splatter on one of the smd capacitors and resistors and it was causing a short....

It matters not buddy ...we've all done it at some time..
What matters is that you resolved it without permanent damage ..and the job gets done..
rgds
Evan

[scooby-doo]

Thanks Evan...I am full of them today...nearly smoked an LG I was working on today as I put the single pink inverter wire on the wrong way...that does make it smoke quite a bit.

Anyway back to this fault....I removed the short and fitted the board....I am getting voltage but its way too low, about 5volts from each 24v pin.....and the 3v has now dropped to 2.3v.

I thinks I fluffed it

[E Parton]

..Is that 5volts on load ...?
Whats the voltage with the invertor board disconnected ?

[scooby-doo]

Hi

Just checked again with and without inverter connected....the 3.2v is back and I have lost the low voltage on the inverter feed....Thats connected and disconnected

I have just checked all 3 pins of D2010 and not getting anything from that either