eax64905001 No Pfc Help ?

[CostasCostas]

Re: eax64905001 No Pfc Help ?

Hi guys, I have this PSU with a 3 to 4 year old 32" LG TV. A few days ago the good wife splashed water on the TV, near the IR sensor, and now we just have sound and no picture.

Trawling the internet suggests it might be a problem with the t-con board. I have checked the voltage readings on the psu and they seem to tie up with what's in this thread. I should just add that the LED's are coming on, just no picture.

For the t-con board I have checked against the published voltage points and they look ok. Can't find any details or check points on the main video board.

Do you think it will be the t-con that has failed or are there any basic tests I can do on the video board?

Re: eax64905001 No Pfc Help ?

Problem SOLVED!

It was two LED's which were broken on backlight ... power supply does not output 70V if it detects problem with LED's ... So it was in protective mode. I replaced LED's and TV is working normally. Thanks for you help and ideas!

Did you replaced the entire led stripe or just the single leds? in the second case can you tell me the led's identification code?

Thanks

[jarda105]

Re: eax64905001 No Pfc Help ?

One more thing is after cca 10minutes of measuring is hard to touch heatsink on Q101 because of temp I think about 60°C.

[jarda105]

Re: eax64905001 No Pfc Help ?

Please for advice. Voltage on P801 - led output is between 0 - 0.6V (oscilating). TV is operating (with headlamp directed on LCD panel I can see MENU). Testpoints P802 (43-45V), P803 same. P203 11.9V, P202 23.3V, P204 23.3V
Q801 - DRAIN 44V source and gate 0V
Q802 - DRAIN 0.130V source and gate 0.020V
Main voltages are 3.45V, 23.4V, 12V, on con. to Mainboard PDIN 1.12V and DRVON is 3,0V
On IC801 pin 9 PWMO (to Q802) is 0,02V. Vcc is 12V and REF is 4,96V. But gate pin 3 is only 0,02V. Thank you for any advice. What voltage should be on IC801 on pin 9? On schematic is Q803 but I can't find it on board - probabaly it's different version.

[jarda105]

Re: eax64905001 No Pfc Help ?

Thank you, I'll do some measurements.

[ReeceyBurger123]

Re: eax64905001 No Pfc Help ?

It should at start up with the Leds out fire up to 80v then back to 24v if there are no Leds if not then the Leds are fine and Psu is at fault.

[jarda105]

Re: eax64905001 No Pfc Help ?

Hi, I have similiar problem with EAX64905001. I have no output voltage on con P801 with unconnected LED panel. Is there any protective when there's not load on output ? Or should be there 80V ? Thank you.

[ReeceyBurger123]

Re: eax64905001 No Pfc Help ?

Nice work

[gurug]

Re: eax64905001 No Pfc Help ?

Problem SOLVED!

It was two LED's which were broken on backlight ... power supply does not output 70V if it detects problem with LED's ... So it was in protective mode. I replaced LED's and TV is working normally. Thanks for you help and ideas!

[gurug]

Re: eax64905001 No Pfc Help ?

Tested q801 and it seems ok ... hm, I guess I'll just order new power supply

Hm, order "new" power supply board, but no luck ... seems this board I got is broken too ... It has 0V on LED output ... but I'm wondering, it is same model of board EAX64905001, but original was REV2.0 and this one I bought via eBay is REV4.0... Is this relevant?

Like I said before on old board when I disconnect MOSfet I got stable 46V on connector ... please advice me further where to look - mosfet seems ok ...

Thanks

[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?

Tested q801 and it seems ok ... hm, I guess I'll just order new power supply

[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?

[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

[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 ?

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 ?

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 ?

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...

[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.

[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 ?

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?