LC-60LE550U No Power

[R_J]

Re: LC-60LE550U No Power

You measure the output of the bridge rectifier across its - and + pins. HS7001 is connected to the bridge negative via FB7003
If by KIA you mean Q7120, that is a 4 pin regulator for PNL12V and is controlled by the main board. If you have 13vdc on its input there is a good chance the power supply is working, to get any voltage OUT of Q7120, you need to take the PNL_POW pin16 high

[m4a2t0t]

Re: LC-60LE550U No Power

If I put 5V on pin 16 I get 12V on the output.

The rectifier reads 67V for middle pins and 15V across - and +

[Davi.p]

Re: LC-60LE550U No Power

your battery of meter is kaputt.. the board is probably ok, must be loaded with resistor in 5v and car lamp on 13v

[R_J]

Re: LC-60LE550U No Power

If I put 5V on pin 16 I get 12V on the output.

The rectifier reads 67V for middle pins and 15V across - and +

You don't seem to understand what a bridge rectifier does. The two inner pins ~ and ~ are where the AC is connected, The bridge rectifier then rectifies this AC into DC voltage across the + and -

The BRIDGE RECTIFIER is BD7001

Measure the AC voltage across the AC1 plug going to the board. You MUST change your meter from AC to DC to check AC voltage or DC voltage.

What kind of meter are you using?

[nomoresonys]

Re: LC-60LE550U No Power

Bridge rectifier checking by tampatec, thanks Vinceroger for reminding me when I completely forgot: https://www.youtube.com/watch?v=zK8oNhFaRdM

[m4a2t0t]

Re: LC-60LE550U No Power

I remember what a bridge rectifier is but for some reason I kept thinking everything on the primary side was in AC

The proper reading are 406V on the large caps.

Is the main board the problem?

[R_J]

Re: LC-60LE550U No Power

I remember what a bridge rectifier is but for some reason I kept thinking everything on the primary side was in AC

The proper reading are 406V on the large caps.

Is the main board the problem?

All this means is that the PFC circuit IS working, so I suspect all the other voltages produced by the power supply are also there. Try disconnecting one of the flat white cables between the panel and the t-con board and see if you get anything on the panel, if not, reconnect it and try the same with the other cable. (don't remove or connect cables with power applied)

[m4a2t0t]

Re: LC-60LE550U No Power

I see nothing on the screen when removing Tcon cables.

[R_J]

Re: LC-60LE550U No Power

Are you getting any voltage on the PL plug on the t-con board?

[m4a2t0t]

Re: LC-60LE550U No Power

There is 12Vdc on the right 2 pins.

The mainboard is still disconnected from the psu but im using the mainboard side connector to add 5v and the tcon is still connected to the psu.

Im using a flashlight to look at the screen.

[Davi.p]

Re: LC-60LE550U No Power

this is not the way of testing a tv, first must check if the power board is ok, how i have already explained, after this youvdaj disconnect tcon and watch if strange supply tensions persists..