eax64905001 No Pfc Help ?

[snopy44]

Re: eax64905001 No Pfc Help ?

no just the blinking leds and not powering up

[ReeceyBurger123]

Re: eax64905001 No Pfc Help ?

Ok have you checked any voltages yet ?

[George266]

Re: eax64905001 No Pfc Help ?

Hello,
I have got the same problem here- LG 32LN570R, but the board is the same tan the one mentioned in the comments above.
The PSU board is eax64905001 ver. 2.4
I can see the image on the display when I use torch , therefore the Backlight is not getting voltage I believe.
I have measured the voltage to backlight, which fluctuate between 11V -21V
Other voltages on PSU board seems to be right 3,3V , 3,47V , 12V and 24V.

Any ideas which part is causing this ?

Thanks for any help

[ReeceyBurger123]

Re: eax64905001 No Pfc Help ?

Hello,
I have got the same problem here- LG 32LN570R, but the board is the same tan the one mentioned in the comments above.
The PSU board is eax64905001 ver. 2.4
I can see the image on the display when I use torch , therefore the Backlight is not getting voltage I believe.
I have measured the voltage to backlight, which fluctuate between 11V -21V
Other voltages on PSU board seems to be right 3,3V , 3,47V , 12V and 24V.

Any ideas which part is causing this ?

Thanks for any help

Led driver Ic imo replace that. Video coming soon.

[ReeceyBurger123]

Re: eax64905001 No Pfc Help ?

no just the blinking leds and not powering up

How you a multimeter mate ?

[gurug]

Re: eax64905001 No Pfc Help ?

Hello,
I have got the same problem here- LG 32LN570R, but the board is the same tan the one mentioned in the comments above.
The PSU board is eax64905001 ver. 2.4
I can see the image on the display when I use torch , therefore the Backlight is not getting voltage I believe.
I have measured the voltage to backlight, which fluctuate between 11V -21V
Other voltages on PSU board seems to be right 3,3V , 3,47V , 12V and 24V.

Any ideas which part is causing this ?

Thanks for any help

I have exactly same problem, voltage to backlight fluctoates between 11-20V. I replaced MAP3202 - but problem is the same ... can you help me to further diagnose fault?

Thanks in advance.

[ReeceyBurger123]

Re: eax64905001 No Pfc Help ?

Check the 24v diode and the Led mosfet for S/C that could be pulling the 24v low.

[gurug]

Re: eax64905001 No Pfc Help ?

Check the 24v diode and the Led mosfet for S/C that could be pulling the 24v low.

Can you tell me which diode and mosfet is that? And what diws s/c mean? Voktages on connector to main board are all ok, 24v also.

[vinceroger69]

Re: eax64905001 No Pfc Help ?

S/c means short circuit if you upload a picture of the top and bottom of your power supply im sure we can pont them out too you unless reece knows the location number already

[ReeceyBurger123]

Re: eax64905001 No Pfc Help ?

Can you get us an image of the underside of the Pcb please ?

[gurug]

Re: eax64905001 No Pfc Help ?

Can you get us an image of the underside of the Pcb please ?

PCB is same as listed on first page of this thread, I attached pictures. And also schematics of power supply.

[gurug]

Re: eax64905001 No Pfc Help ?

PCB is same as listed on first page of this thread, I attached pictures. And also schematics of power supply.

On C204 and C214 voltage is fluctoating from 43 to 48V ... if this helps to diagnose?

[ReeceyBurger123]

Re: eax64905001 No Pfc Help ?

So on the connector its 0-20v then on the cap which is the Led output filter its 48v ? I dont see how you measured this as the cap goes straight to the connector ? Seems to me like the controller is still bad, or something that feeds it is bad.

[gurug]

Re: eax64905001 No Pfc Help ?

So on the connector its 0-20v then on the cap which is the Led output filter its 48v ? I dont see how you measured this as the cap goes straight to the connector ? Seems to me like the controller is still bad, or something that feeds it is bad.

Yes on connector is from 11 to 20V. And on C214 is like I said. And it's not going straight to connector, see attached schematics.

[gurug]

Re: eax64905001 No Pfc Help ?

Yes on connector is from 11 to 20V. And on C214 is like I said. And it's not going straight to connector, see attached schematics.

I'm measuring C214 directly and LED connector also directly I use + and minus on connector...

[ReeceyBurger123]

Re: eax64905001 No Pfc Help ?

Ahh yes I see my bad I got confused with the other cap. What VCC is going to the mosfet ?

[gurug]

Re: eax64905001 No Pfc Help ?

Ahh yes I see my bad I got confused with the other cap. What VCC is going to the mosfet ?

Can you tell me which mosfet you have in mind?

[ReeceyBurger123]

Re: eax64905001 No Pfc Help ?

Q801 matey, I have a video on this set being uploaded next week of how I repaired it.

[gurug]

Re: eax64905001 No Pfc Help ?

Q801 matey, I have a video on this set being uploaded next week of how I repaired it.

I thought your problem was only with MAP3202?

On mosfet middle pin gets 43 to 48V - from L801

[gurug]

Re: eax64905001 No Pfc Help ?

I disconnected mosfet q801, and i got 46V on led connector and no fluctuation... does that mean that q801 is bad?