Hi. I was watching TV this evening when the screen suddenly went black. At first I thought I had accidentally pressed a button on the remote but nothing I do will make the TV come back on. I tried switching off and then on at the mains but that didn't work. I looked in the owner's manual and it said that if the screen is black and the standby light is blinking steadily, which it is, it means that the TV is using its power management system. Unfortunately, it only tells you how to get out of this mode if the TV is connected to a PC, which mine isn't. I reset the remote control as this website said to try that but agan nothing happened. I'm really stuck. I don't even know if the TV is on or off. Help!
SOURCE: Samsung LN-R408D - No Picture
My Mom's LNR408D also had sound but no picture. I was able to fix it by soldering in a jumper wire across a blown (1.5A ???) SMD picofuse on the "T-Con" board.
Consider attempting this ONLY if you:
0) Know enough to avoid the potentially fatal High Voltage parts of the power supply board!!!
1) Are a fearless hackazoid
2) know what you're doing with a soldering iron and teensie SMD parts
3) are gonna throw the busted thing out anyway so you have nothing to lose and won't be sad if you screw something up.
4) Know enough to avoid the potentially FATAL High Voltage parts of the power supply board!!!!!
This board is at the top center under a close fitting RF shield. The suspect part was labeled "CP" on the board and marked with "P" on the part. It is visible above the right-center of the connector from the main board. An ohmmeter showed it as open, so I bypassed it with a jumper wire from connector VIN to the hot side of C13. One image shows the suspect part and the jumper in place.
The other shows the TCON board placement top-center (under its RF shield). With care, it seems possible to test the fuse and put the jumper in place without removing the shield. (Obviously don't touch anything else with the VOM leads!)
Thanks to ZORBUS and Steve's TV and Electronics for the idea.
http://www.avforums.com/forums/lcd-televisions/892447-no-picture-but-got-sound-my-samsung-lcd.html
http://www.gesda.com/transformer/Fall08_files/Page336.htm
Steve C
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