i have a samsung lnt3232hx, 32" lcd 720p tv. when turned on there is no light or flicker onscreen, just black screen, yet audio is ok. i tested the 2 hdmi, 2 composite, svideo, and coax inputs with the same black screen resulting, and persisting when changing video source. i tried leaving the tv on for about 90 minutes, with audio up enough to tell its still going, but there were no changes. no edge lights, no lights with the back off other than the red power light and the digital audio port. i inspected the main (only ceramic caps), p/s (samwha & capxcon caps) & inverter (brown, no visible company identifier) caps & cables but didnt see any apparent problems.
i have replaced bad caps on another pc monitor, but these caps show no bulging, discoloration & all the boards i looked at were quite clean looking with no cold solder joints visible. i tried to remove the cover of the tcon bd, but after taking out the 4 screws (yes, i unscrewed the braces above), the covers will only slide side-to-side a bit, but won't lift out - must be a trick that i just dont see to remove it. so i was unable to inspect tcon bd.
the slow-blow fuse on the p/s tested with 1 ohm resistance. i need to find my magnifier to see where any tiny fuses might reside on the boards. i disconnected the inverter bd cable to test voltage - the 24v measured 24.4, 5v = 5.3, and another wire measure 1.9 - the grounds all had 1 ohm resistance between them. the leads to the main board had 5 = 5.3 & 12 = 11.8. i noted that when i disconnected the cables between the p/s & main, there was no voltage to the inverter (which i expect is normal)
in my reading, someone noted that samsung uses cheap panels by chunghwa instead of their own, which is the case with this tv. i disconnected and reconnected all the cables that werent glued in place. i dont know the history of the tv, as it was left behind by a freeloading ex-roommate. if i can fix it within reason, i would find some satisfaction.
are there other troubleshooting suggestions i could try? do these symptoms point to anything common or obvious to the expert? what's the trick to remove the cover above the tcon bd? thanks for any and all help
i have replaced bad caps on another pc monitor, but these caps show no bulging, discoloration & all the boards i looked at were quite clean looking with no cold solder joints visible. i tried to remove the cover of the tcon bd, but after taking out the 4 screws (yes, i unscrewed the braces above), the covers will only slide side-to-side a bit, but won't lift out - must be a trick that i just dont see to remove it. so i was unable to inspect tcon bd.
the slow-blow fuse on the p/s tested with 1 ohm resistance. i need to find my magnifier to see where any tiny fuses might reside on the boards. i disconnected the inverter bd cable to test voltage - the 24v measured 24.4, 5v = 5.3, and another wire measure 1.9 - the grounds all had 1 ohm resistance between them. the leads to the main board had 5 = 5.3 & 12 = 11.8. i noted that when i disconnected the cables between the p/s & main, there was no voltage to the inverter (which i expect is normal)
in my reading, someone noted that samsung uses cheap panels by chunghwa instead of their own, which is the case with this tv. i disconnected and reconnected all the cables that werent glued in place. i dont know the history of the tv, as it was left behind by a freeloading ex-roommate. if i can fix it within reason, i would find some satisfaction.
are there other troubleshooting suggestions i could try? do these symptoms point to anything common or obvious to the expert? what's the trick to remove the cover above the tcon bd? thanks for any and all help
I bought some stuff to try to repair it and learn as many things as possible about computer repairs but nothing worked so far. When the black screen appeared, my legion 5 pro was connected to my external monitor...
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