Re: LG 60PB690V Clicking noise. Could it be the main board?
Latest development:
It was suggested to me that if the plug is disconnected when TV is on the main board will not switch into standby mode. So I have connected all the boards back together, connected the TV to the mains and then I switched it off by pressing the power button on the remote. The tv went into standby mode. Then I started testing if sound works ok. I plugged a source (PS3) to one of the HDMI's and to my surprise after switching the TV on with the remote not only the sound came on but the screen...
witor
Member
Last Activity: 10-05-2022, 02:13 AM
Joined: 12-08-2017
Location: Norwich
-
Re: LG 60PB690V Clicking noise. Could it be the main board?
I have included pictures of the ribbon socket (which goes to the control board) P100 on the YSUS. There is nothing about 18V on the label of it. I have also included the picture of the power socket on YSUS (which goes to ZSUS) P130 which has 18V on the label. I am thinking about removing 18V wire from the plug going to P130 and then checking if I have 18V on the P130 output from the YSUS. This would allow me to see if there is a fault on the YSUS or if the ZSUS is dragging the voltage down. Does that sound like a good idea?...Leave a comment:
-
Re: LG 60PB690V Clicking noise. Could it be the main board?
I tried to measure the voltage at 18V test point on ZSUS again this time with ZSUS connected the power supply board and YSUS connected to ZSUS just to check if I get 18V on ZSUS from YSUS. The main board was also connected to the power board. Buffers were disconnected. Tape connectors from ZSUS and YSUS were also disconnected.
No 18V on the test point on ZSUS.
Does that mean that I should focus on YSUS rather than on ZSUS? If yes what can I do next?Leave a comment:
-
Re: LG 60PB690V Clicking noise. Could it be the main board?
I have attached the picture of the tv layout. Some boards are disconnected as I am still trying to pinpoint the fault. I have also attached ZSUS picture with 18V test point visible. There should be also 18V output to the YSUS, but I have only measured 5V there (outside pin of the connector, labelled 18V)
I have already checked the transistors on the YSUS by using an ohmmeter and by measuring the resistance between connectors of the transistors (without desoldering them). I have checked all large transistors...Leave a comment:
-
Re: LG 60PB690V Clicking noise. Could it be the main board?
Thanks for the link, but after I have replaced the power board I am not getting continuous clicking and my red led does not come on at all after I plug the tv in. I just get one click and that's it; even with YSUS board disconnected. My main suspect is ZSUS board because it doesn't give 18V to the YSUS. I am still waiting for someone to confirm that this 18V should be on the ZSUS board even if other boards (main and YSUS) are disconnected from the power board
Just to clarify. In this TV YSUS is connected...Leave a comment:
-
Re: LG 60PB690V Clicking noise. Could it be the main board?
I am still trying to figure out what is wrong with this TV. With main and YSUS boards disconnected and only ZSUS board connected to the power supply board, I have measured the voltage on test point labelled 18V on the ZSUS board and I am only getting 3.8V. Voltages on the output of the power supply board were normal and as labelled on the connector when all boards were connected. With disconnected YSUS board VS and VA are slightly high 225 and 65V respectively. This is with a 'new' power board. Does that mean that there...Leave a comment:
-
Re: LG 60PB690V Clicking noise. Could it be the main board?
I have replaced the power supply board. There no more clicking sound, the tv switches on and stays on but there is absolutely nothing on the screen. The screen is just black and there is no sound. There is no way of checking if the sound works as I cant access any menus. Any suggestions what I could check or try next?
When I connected the new power supply board I adjusted the VS voltage from 208V to 206V. On the panel, it says that VS should be 205V and VA should be 55V.Leave a comment:
-
Re: LG 60PB690V Clicking noise. Could it be the main board?
I have tried to include some pictures of the power supply board. I have also measured the resistance of the 2 highlighted resistors (without desoldering them) Both resistances were close to 0....Leave a comment:
-
Re: LG 60PB690V Clicking noise. Could it be the main board?
I had a look at the panel label. Voltages should be as follows:
VS - 205
VA - 56
I have disconnected all board from the power board. After powering it on initially VS voltage varies kind of randomly between 208V and 280V and VA varies between 55 and 78V.
I came back to measure voltages again after few minutes (power supply board was on all the time) and I have measured stable VS 326 and VA 72.
1) Does that mean that power board is faulty?
2) If yes could it had already...Leave a comment:
-
LG 60PB690V Clicking noise. Could it be the main board?
While I was watching it suddenly switched itself off and then started clicking. Red LED on and of with a clicking sound of the relay. So far I have done the following.
1) Disconnected XSUS and YSUS boards form the power supply board, still clicking
2) Disconnected the main board, no more clicks.
I have measured some voltages from the PS board with the main board disconnected from it: VS - 324V, VA - 73V, 5V - 5.2V
With main board connected to the PS 5V voltage changes as relay is clicking between 0 and 5V
Is my conclusion... -
Re: New Members - please post your introductions here
My Tv just stopped working. This seems to be a very good forum to get some help and learn something on the way. I am looking forward to absorbing some knowledge!Leave a comment:
No activity results to display
Leave a comment: