JVC JLC37BC3000 has no 5v standby

[triplefour]

first time seeing a JVC. this one is just 2 boards, a psu/inv combo and a mb/tcon combo

seems like a bad psu since i dont see any voltage coming from the psu.

i cant see anything visibly damaged. fuse checks out ok, i see some dc voltages on the components nearer to where the power comes in, but then no voltages on the components by the connector going out to the mb.

anyone work on one of these before?

[tom66]

Re: JVC JLC37BC3000 has no 5v standby

Worth noting this is actually an AmTran set, same company that makes Vizio TVs.

Check for standby voltage with the main board unplugged, to eliminate a possibly shorted main board.

[triplefour]

Re: JVC JLC37BC3000 has no 5v standby

dang i guess i should have mentioned i tried that already. with no difference

[budm]

Re: JVC JLC37BC3000 has no 5v standby

Good clear pictures of the bottom side of the board so we can clearly see the traces? Need to see if we get b+ to that SMPS IC for the stby power supply.

[triplefour]

Re: JVC JLC37BC3000 has no 5v standby

sorry for taking forever but ive been so busy lately.
heres the pics of the underside of the board.

[triplefour]

Re: JVC JLC37BC3000 has no 5v standby

whoops should have checked shopjimmy first. always with the much better pictures.
according to shopjimmy its a Vizio 0500-0412-1020 Power Supply Board

[triplefour]

Re: JVC JLC37BC3000 has no 5v standby

sorry..what is B+ ?

[tom66]

Re: JVC JLC37BC3000 has no 5v standby

Another word for PFC or rectified voltage i.e. across the 450V caps.

[triplefour]

Re: JVC JLC37BC3000 has no 5v standby

ok thanks. yes i need to check the PFC