Hi all, i have a wharfedale lcd3210af in for repair at the moment, initially it would switch itself off (standby light would come on) & sound would go off. I changed the caps on the Vestel sub power board & that cured that problem.
Just before i handed it back i decided to use it let it run for several hours & after it got nice & warm the back lights went out but the set stayed on (no standby light & sound still present).This set uses a Li Shin 0420D02216 PSU which supplies 12v immediately power is applied (always on) & 24 v for the inverters which is switched on by a 3.6v signal from the sub psu board. i found the 3.6v was still present , but the 24v off the main PSU was missing so it looks like the inverter side is just shutting itself off.
Today i went to replace the SG6841 chip on the underside of the board & unusually for me i lifted a track connected to PIN 3 of the chip. I cleaned the board up but i cant for the life of me see where this pin 3 (its the supply pin) connects to . It 's weird as it looks just like it was a redundant pad but it cant be as it has to supply the chip with voltage. I have enclosed a pic & was wondering if anyone has one on the bench or shelf if they can have a look & give me a clue as to where the damm thing connects to or maybe take a nice clear picture. I apoogise for the quality of my pic but the light was failing.
Thanks in advance
Graham
Just before i handed it back i decided to use it let it run for several hours & after it got nice & warm the back lights went out but the set stayed on (no standby light & sound still present).This set uses a Li Shin 0420D02216 PSU which supplies 12v immediately power is applied (always on) & 24 v for the inverters which is switched on by a 3.6v signal from the sub psu board. i found the 3.6v was still present , but the 24v off the main PSU was missing so it looks like the inverter side is just shutting itself off.
Today i went to replace the SG6841 chip on the underside of the board & unusually for me i lifted a track connected to PIN 3 of the chip. I cleaned the board up but i cant for the life of me see where this pin 3 (its the supply pin) connects to . It 's weird as it looks just like it was a redundant pad but it cant be as it has to supply the chip with voltage. I have enclosed a pic & was wondering if anyone has one on the bench or shelf if they can have a look & give me a clue as to where the damm thing connects to or maybe take a nice clear picture. I apoogise for the quality of my pic but the light was failing.
Thanks in advance
Graham
Attached Files
