Hi Guys,
This forum has been in great help to me, but I stumbled upon a strange problem with a salvaged Samsung TV that I am banging my head to troubleshoot.
PSU: L48S6 FHS BN44-00807D
T-Con: BN95-01937A
Panel: CY-GJ048HGLVLH
MB: NA (Currently as the TV is assembled and forgot to take picture)
As I said earlier I have some issues with the TV I got from a friend of mine. The TV had no picture, but sound, back light and everything else was working fine.
It was sent to an authorized service for repairs and returned with the diagnose that the LCD panel is dead.
I took it, as I like to tinker with electronics and started troubleshooting it. Thought that i should give it a try by replacing the T-Con board.
First the TV did not start, but after some tries picture came back and it was perfect. No artifacts or anything. TV seems to respond well to the remote, etc. I assembled it again and it was working for some time, but after powering it off from the remote and powering it back on the picture was gone again. After waiting for 5-10 minutes and then powering it back on the picture is back.
What I have checked on the PSU:
I have looked at the PSU board but did not find any visibly burnt components.
I have measured the voltages on the test point on the transistors of the PSU. On the board it says that the Power on voltage should be 13V and it is present, but the standby voltage is 9V instead of 8V. Also there is a high pitched sound coming from the PSU when the TV is in standby mode.
What I have checked on the T-Con:
T-Con has two LEDs. When the TV is powered on one of the LEDs is constantly on, but the other one flashes for a second and then turns off. In the case where the panel works both LEDs are lit constantly.
To sum everything up:
1. Checked the PSU. Power on Voltage is 13V as expected, but standby voltage is 9V instead of 8. High pitched sound coming from the PSU board when in standby mode.
2. Replaced the T-Con board. It has 2 LEDs which are constantly on when panel works fine. When the panel does not work fine one of them flashes for a second and goes off.
Is it possible that these 9 volts during standby somehow mess with the TV so it does not really go into standby and mess the startup procedure of the TV?
Since the panel works fine (when it works) I really start to doubt the diagnose from the repair service the TV was sent to.
I am not really sure how to proceed further with the troubleshooting. Any help would really be appreciated.
This forum has been in great help to me, but I stumbled upon a strange problem with a salvaged Samsung TV that I am banging my head to troubleshoot.
PSU: L48S6 FHS BN44-00807D
T-Con: BN95-01937A
Panel: CY-GJ048HGLVLH
MB: NA (Currently as the TV is assembled and forgot to take picture)
As I said earlier I have some issues with the TV I got from a friend of mine. The TV had no picture, but sound, back light and everything else was working fine.
It was sent to an authorized service for repairs and returned with the diagnose that the LCD panel is dead.
I took it, as I like to tinker with electronics and started troubleshooting it. Thought that i should give it a try by replacing the T-Con board.
First the TV did not start, but after some tries picture came back and it was perfect. No artifacts or anything. TV seems to respond well to the remote, etc. I assembled it again and it was working for some time, but after powering it off from the remote and powering it back on the picture was gone again. After waiting for 5-10 minutes and then powering it back on the picture is back.
What I have checked on the PSU:
I have looked at the PSU board but did not find any visibly burnt components.
I have measured the voltages on the test point on the transistors of the PSU. On the board it says that the Power on voltage should be 13V and it is present, but the standby voltage is 9V instead of 8V. Also there is a high pitched sound coming from the PSU when the TV is in standby mode.
What I have checked on the T-Con:
T-Con has two LEDs. When the TV is powered on one of the LEDs is constantly on, but the other one flashes for a second and then turns off. In the case where the panel works both LEDs are lit constantly.
To sum everything up:
1. Checked the PSU. Power on Voltage is 13V as expected, but standby voltage is 9V instead of 8. High pitched sound coming from the PSU board when in standby mode.
2. Replaced the T-Con board. It has 2 LEDs which are constantly on when panel works fine. When the panel does not work fine one of them flashes for a second and goes off.
Is it possible that these 9 volts during standby somehow mess with the TV so it does not really go into standby and mess the startup procedure of the TV?
Since the panel works fine (when it works) I really start to doubt the diagnose from the repair service the TV was sent to.
I am not really sure how to proceed further with the troubleshooting. Any help would really be appreciated.
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