I have this LG 50Pt350. It has standby light but i press the power on no picture.
I want to know what is ctrl_0E and what is the voltage on that pin.
I want to know what is ctrl_0E and what is the voltage on that pin.
Attached Files
-
-
Re: 50pt350
I measured the va and vs voltages.
va 120vac
vs 450vac
Any suggestion?Attached Files -
-
Re: 50pt350
you need to measure in DC then look at the panel sticker to see if VS/VA match up etc etcComment
-
Re: 50pt350
Those voltages are roughly double what they should be. Are you sure your meter is reading correctly. Have you measured some of the low dc voltages to see that your meter reads them correctly. CTRL_OE possibly "Control Output Enable" but just a guess.
Edit
+1 Sordids999 missed the "ac"Last edited by dick_barton; 08-11-2016, 12:02 PM.Willing to help but I'm no expert.Comment
-
Re: 50pt350
sordids999 thanks, vdc 200 vs and 53 vaComment
-
Re: 50pt350
Slightly low but I don't think enough to stop it working. There will be other voltage test points on the boards. Vsc, VE etc. Can you find and measure the dc voltages at those points.Willing to help but I'm no expert.Comment
-
Re: 50pt350
On Lgs Ve is Zbias.Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
https://www.facebook.com/Telford-Tel...7894576335359/Comment
-
Re: 50pt350
the vsc voltage is bouncing from 0 to 202.
vzbis 88Comment
-
Re: 50pt350
Ysus or buffer issue then, remove buffer modules one at a time (upper first then lower) and and restest Vsc you might even get an image if one of the buffers is short and you remove it on one half of the screen.Last edited by ReeceyBurger123; 08-11-2016, 01:42 PM.Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
https://www.facebook.com/Telford-Tel...7894576335359/Comment
-
Re: 50pt350
Shouldn't there be two relays that click when you turn the set on?Comment
-
Re: 50pt350
You have Vs meaning relays have turned on the fault is with Ysus or buffer.Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
https://www.facebook.com/Telford-Tel...7894576335359/Comment
-
Re: 50pt350
Ok, I think it is the ysus and not the buffer. Cause the voltage still bounced around with the upper and lower buffers removed.
Thanks for your help.Comment
-
Re: 50pt350
Reeceyburger123, can you answer what is ctrl_0e it run from the control board to the ysus? I don't have any voltage at that pin.Attached FilesComment
-
-
Re: 50pt350
Replaced the ysus board and there was a puff a smoke coming from lower buffer. still no picture top or bottom.Comment
-
Re: 50pt350
bumpComment
-
Re: 50pt350
Ok so the buffer want bang with a replacement Y sus ? Keep both buffers out and recheck Vsc, what is that voltage doing ?Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
https://www.facebook.com/Telford-Tel...7894576335359/Comment
-
Re: 50pt350
On the power board, fuses F302, F801 has bouncing voltage. Fuse 101 120vac.
Everywhere 15vdc is suppose to be Im getting a reading of 18.5.Comment
-
Re: 50pt350
with buffer removed the voltage is still bouncing.Comment
-
Re: 50pt350
What about with the Ysus disconnected ? What does Vs do ?Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
https://www.facebook.com/Telford-Tel...7894576335359/Comment
-
Re: 50pt350
hey the vs test point and va test point on the pbd never balanced. va 55vdc and vs 205vdcComment
-
I have a post on psx-place for this but thought I'd try here as well in case anyone has experience or the schematics or any kind of help. Here's the original post from psx-place:
START
Hi, so I bought a YLOD Fat PS3 as I wanted a repair project and thought it would be a good way to get experience. I was able to solder to the RX, TX and Diag pads on the COK-002 motherboard and was able to get external access and retrieved the codes. I haven't powered it on beforehand so these should be the last ones. I did try to get internal access immediately after but kept getting scopen response... -
This is my first attempt at troubleshooting a board like this, I know I could just buy a new board but I'm curious to figure out how this works. I've been testing different components in the evenings this week and I think the problem is with the IC failing to start up for some reason. When the board is plugged in there is no standby voltage.
Then today it randomly sprung to life like a zombie but shortly died thereafter. I have no idea why it would have done that and its the first time I've seen it running. I discharged capacitors on the board last night, then it was sitting today.... -
Hi. I got a Vizio with no power or standby, and won't turn on with remote or button. I checked the voltages on the connector and all read 0.00V or nearly 0(0.050 ON/OFF pin). None of the pins are labeled STB for standby although I do see some 5V pins. Other than the obvious standby led, which isn't coming on, is there a way to check for standby voltage on this PS. I'm trying to see if my problem is the PS or mainboard. Some Vizios I have fixed with no standby led me to think it was the PS but it turned out being the mainboard. Any experience with this set would be greatly appreciated. -
Hi all.
I started a thread while back regarding TV power supply standby circuitry as it is something I am not quite on top of.
SMPS theory and function is becoming more familiar, however the standby part is still a bit of a mystery.
Anyway, a friend has this TV with the above mentioned power supply board which has no standby voltage, nor any other voltages leaving the board.
The mains AC comes in fine, gets filtered and rectified with power is on the main filter cap as well as the transformer and drain pins of the ICE3B0665J, but that's it.
... -
Hello,
I am trying to re-purpose this power supply that I saved years ago from a tv with a cracked screen for a monitor but that is not really that relevent at the moment. I do not recall which tv but a google search looks like it is from Wharfedale LTF37K1.
You may notice I made some alterations moving some components to the top and some wires which are from a 5v regulator I fitted to the 12v output as the monitor requires 5v. The standby was already at fault from the beginning, it has nothing to do with the alterations...
Years ago it had some bulging caps...
Comment