LG 60PY3DF shuts off

[brentkhack]

Re: LG 60PY3DF shuts off

Yeah, so the main board is switching it off for some reason. My 42PC1D did the same thing but it was doing it because of AC-D going low. How is STBY5V? What about the 3.4V output, if it has one...

Edit: I didn't consider the possibility that 220 ohms is not capable of overriding the AC detect. What does AC detect measure at with the resistor in place? Does the TV make a crackling/popping sound from speakers now when it is unplugged?

Yes I do hear a quick pop.

[brentkhack]

Re: LG 60PY3DF shuts off

Any other ideas I can try?

[tom66]

Re: LG 60PY3DF shuts off

Does the pop happen without the resistor? I would start checking the VS_ON voltage and see if it is stable. If it starts at 5V and drops to 0V, for some reason the main board is switching off the power supply.

[brentkhack]

Re: LG 60PY3DF shuts off

With the power plugged it and tv off I get 1.65v as soon as I hit power button it goes to .28v then right back up to 3.90v during remaining boot process. When it powers down automatically i get 1.65v again.

[tom66]

Re: LG 60PY3DF shuts off

Where is your ground? That reading like the AC detect is very strange.

[brentkhack]

Re: LG 60PY3DF shuts off

Where is your ground? That reading like the AC detect is very strange.

I place the ground probe in different holes for mounting the tv with all the same results.

[tom66]

Re: LG 60PY3DF shuts off

How does AC detect behave when that connector is disconnected (TV probably won't power up)

[brentkhack]

Re: LG 60PY3DF shuts off

AC-ON with checking the connector out and touching the pin I get 4.35v. When I plug the connector in and check from the back of the connector I get 3.78v.

[tom66]

Re: LG 60PY3DF shuts off

How is AC detect with the 220 ohm resistor?

[brentkhack]

Re: LG 60PY3DF shuts off

How is AC detect with the 220 ohm resistor?

With everything hooked up and not turned on I get 4.58v, when I turn it on I get 4.55v during the whole boot process.

[tom66]

Re: LG 60PY3DF shuts off

Can you move it from AC detect to VS ON? This will have the effect of keeping the sustain voltages on continuously. It may still shut down however.

[brentkhack]

Re: LG 60PY3DF shuts off

Can you move it from AC detect to VS ON? This will have the effect of keeping the sustain voltages on continuously. It may still shut down however.

STBY5V was 5.02v powered off and 4.98v during boot. VS ON was 5.00v off and 4.96v during boot.

[tom66]

Re: LG 60PY3DF shuts off

Did you try with VSON resistor, did TV stay on? If it didn't, did the Vs/Va go away or stay?

[brentkhack]

Re: LG 60PY3DF shuts off

everything today has been with the resistor. How can I tell about Vs/Va go away or stay? TV has been turing off as usual.

[tom66]

Re: LG 60PY3DF shuts off

With resistor in VSON do Vs or Va disappear.

[brentkhack]

Re: LG 60PY3DF shuts off

With resistor in VSON do Vs or Va disappear.

Sorry my IQ goes down on the weekend. But Va .7 when not on and then 60.2 during boot before shutting down. Vs. Is 6.4 when not on. As soon as I hit power button it dropped to .5 then went to 190.7 during boot before shutdown. This is with resistor at VSON and STBY5V.

[tom66]

Re: LG 60PY3DF shuts off

Hmm. This is strange. I'm not sure now if the PSU is just shutting down due to a fault. What other pins are there on the control connector, anything else like "PSON"?

[brentkhack]

Re: LG 60PY3DF shuts off

Hmm. This is strange. I'm not sure now if the PSU is just shutting down due to a fault. What other pins are there on the control connector, anything else like "PSON"?

I have changed out the main PSU and get the same problem. Here is what else is available.

[tom66]

Re: LG 60PY3DF shuts off

How are the pins 5V-DET and 5V-ON?

[brentkhack]

Re: LG 60PY3DF shuts off

5VDET is 0 just plugged in and 4.98 during bootup. Top VSON is 1.6 just plugged in and 3.9 during bootup. Bottom VSON is .47 idle and 3.57 during bootup. All is without resistor.