LG 60PY3DF shuts off

[tom66]

Re: LG 60PY3DF shuts off

Bottom VS-ON? Do you mean 5V-ON?

[brentkhack]

Re: LG 60PY3DF shuts off

Just shoot me. 5VON is .47 at idle and 3.57 during boot up. 5VDET is 0 at idle and 4.98 during bootup.

[tom66]

Re: LG 60PY3DF shuts off

What does it do when it clicks off?

[brentkhack]

Re: LG 60PY3DF shuts off

It just clicks off, no pops.

[tom66]

Re: LG 60PY3DF shuts off

It just clicks off, no pops.

I mean what does 5VON and 5V-DET do?

[electronicsurplus]

Re: LG 60PY3DF shuts off

Can you try disconnecting both Y-Buffers one at a time( I sm sure there are 2 upper and lower and, check the VS and VA, if any change

If the same, leave the YSUS but, try removing one of the fuses. If I remember correctly the Y-Sus has 2 fuses. and, switch to make sure you have proper Vs and VA voltages. The voltages are printed on a sticker on the back of the panel.

Also, if there is still a problem, the YSUS is somewhat simple to check. On the back of the
y-sus board, you will see 3 IPM (intelligent Power Modules), which have many pins. To test if one or more are defevtive using a multimeter check between ground and SUS-Out and, all other points. you should have infinity in one direction and some but, not much resistance. usually 400K or so using diode check. IF ONE or more shorts or near 0 ohms are found then you have a BAD ysus or, at least, one or more IPM Modules.

Just adding some info which worked for me many times with this type of plasma set

Jon

[electronicsurplus]

Re: LG 60PY3DF shuts off

5VON is the 5Volt standby. which the Main board receives and sends to the Power Supply to turn on but, it does go through an error checking part of the main board to verify that all is ok and to turn on. If an error is detected. You can use a 1 or 10 omh resistor to short between these points to trick the power supply to turn on bypassing the Safety shutdown circuit. to test for proper voltages.

The 5V-DET is the PSON or (Power Supply on) voltage source

If the set turns on properly then there is obviously some voltage drain, short or other problem.

Do NOT leave the power supply shorted for long because, it may cause additional problems

Let me know how you make out

I can help you you some help with this set with some but, not all assistance since,
I have dealt with this set many times

Jon

[electronicsurplus]

Re: LG 60PY3DF shuts off

I have a service manual, which wll be uploaded to Tom66 site if you need which will give you a general direction as to what to check. might not be the same IC and test points but, you will, at least, have a general idea where to look

Jon

[brentkhack]

Re: LG 60PY3DF shuts off

I mean what does 5VON and 5V-DET do?

It still does the shut down after 5-8 seconds.

[brentkhack]

Re: LG 60PY3DF shuts off

Can you try disconnecting both Y-Buffers one at a time( I sm sure there are 2 upper and lower and, check the VS and VA, if any change

If the same, leave the YSUS but, try removing one of the fuses. If I remember correctly the Y-Sus has 2 fuses. and, switch to make sure you have proper Vs and VA voltages. The voltages are printed on a sticker on the back of the panel.

Also, if there is still a problem, the YSUS is somewhat simple to check. On the back of the
y-sus board, you will see 3 IPM (intelligent Power Modules), which have many pins. To test if one or more are defevtive using a multimeter check between ground and SUS-Out and, all other points. you should have infinity in one direction and some but, not much resistance. usually 400K or so using diode check. IF ONE or more shorts or near 0 ohms are found then you have a BAD ysus or, at least, one or more IPM Modules.

Just adding some info which worked for me many times with this type of plasma set

Jon

I will try this when I get home later today.

[brentkhack]

Re: LG 60PY3DF shuts off

What are Y buffers? Yes the Y board has 2 fuses. The X board has 1.

[brentkhack]

Re: LG 60PY3DF shuts off

5VON is the 5Volt standby. which the Main board receives and sends to the Power Supply to turn on but, it does go through an error checking part of the main board to verify that all is ok and to turn on. If an error is detected. You can use a 1 or 10 omh resistor to short between these points to trick the power supply to turn on bypassing the Safety shutdown circuit. to test for proper voltages.

The 5V-DET is the PSON or (Power Supply on) voltage source

If the set turns on properly then there is obviously some voltage drain, short or other problem.

Do NOT leave the power supply shorted for long because, it may cause additional problems

Let me know how you make out

I can help you you some help with this set with some but, not all assistance since,
I have dealt with this set many times
W
Jon

.
The first sentence didn't make sense. I need to get either a 1 or 10th ohm resistor between which two pins on the psu? I also tried taking out one fuse at a time and nothing changed. How many watts on the resistor?

[brentkhack]

Re: LG 60PY3DF shuts off

Well the tech guy where I bought the PSU from said to switch out the main board. He asked if both fans were on I said no, only the left fan was on. So he had me swith wires from the fan and then only the right fan worked. This led him to believe the main board isn't working correctly. What do you think?

[tom66]

Re: LG 60PY3DF shuts off

It leads me to think that a temperature sensor somewhere is glitchy. It could be the problem. It's also possible the fan connector on the motherboard is loose or dodgy - check for solder joints etc.

[ilikethemalot]

Re: LG 60PY3DF shuts off

Hi all,
Just wanted to say that I also have an LG 60PY3DF and it seems to have the same issue. When the tv is plugged in, it clicks and the backlight comes on but then it turns itself off and keeps repeating this process of turning on and off.
Not trying to thread jack, just trying to help out and find a solution as well!

JB

[RON_CET]

Re: LG 60PY3DF shuts off

Most set that have cooling fans whether it's 1 fan used or 2 the main board normally controls the turn on and off cycle of the fans.The Main board cpu monitors fan rotation detection via feedback line from the fan connector and if either one of those fans fail to produce either NO or incorrect rotation speed the main board will then send power supply OFF command to power down set.

[brentkhack]

Re: LG 60PY3DF shuts off

Most set that have cooling fans whether it's 1 fan used or 2 the main board normally controls the turn on and off cycle of the fans.The Main board cpu monitors fan rotation detection via feedback line from the fan connector and if either one of those fans fail to produce either NO or incorrect rotation speed the main board will then send power supply OFF command to power down set.

So replace both fans? Where do I get the correct one's with the proper connections?

[brentkhack]

Re: LG 60PY3DF shuts off

First question, should both fans be on at all times? The right brown connection on the board is the one that will not turn the fan on during startup. But there is power there just like the left connection. The other pic are the back soldering. I'm not sure exactly how it should look. Last pic is one ground wire came out of the connector. What would you suggest on how to fix this. It plugs into top of main board. Thanks.

[tom66]

Re: LG 60PY3DF shuts off

If you can get a piece of wire - try jumpering from each 12V and ground line to the fan (test with a meter to find out which is which) and see if both fans spin. If they do, the problem may be in some way with the feedback. I must admit ot would be strange if each spin at a different rate or were turned on and off individually.

[brentkhack]

Re: LG 60PY3DF shuts off

I know both fans work but only the one plugged in the left brown connector.