I have a cheap junky Westinghouse WD55UW4620 TV in my shop. (Pretty sure these are Wal Mart/Best Buy specials...)
Problem: Won't power on. Red power LED on constantly, power button/remote does nothing. No variation/indication when pressing power button.
All boards look good, no popped caps, nothing looks burnt.
Checked all power board voltages (between power brd & main brd) - All appear to be within reasonable values as per the board markings. Nothing missing, nothing too far out of whack. No voltage changes anywhere when pressing power button.
I suspect the main board (only because all the power board voltages seem right...) - Disconnecting power board connector Con2 that is connected to connector J6 on the main board does NOT turn on backlights like most LCDs I've repaired but I can't locate a service manual for this model so I'm not sure if it's supposed to on this model.
SO far I've tracked down a replacement main board from one of my regular sources for around $120.00. Before I spend money for nothing...
Anyone have any good tips on confirming a little more clearly whether it's more likely to be a problem with the main or the pwr board? I have all the necessary test equipment, including a scope but without a service manual/schematic the test equipment is kinda useless.
TV: Westinghouse WD55UW4620
Main board is a CV6488H-A-20.
Power board is aAY155D-45F12
I'm an experienced tech - Any tips/advice (or a link to the service manual) would be gratefully accepted.
Problem: Won't power on. Red power LED on constantly, power button/remote does nothing. No variation/indication when pressing power button.
All boards look good, no popped caps, nothing looks burnt.
Checked all power board voltages (between power brd & main brd) - All appear to be within reasonable values as per the board markings. Nothing missing, nothing too far out of whack. No voltage changes anywhere when pressing power button.
I suspect the main board (only because all the power board voltages seem right...) - Disconnecting power board connector Con2 that is connected to connector J6 on the main board does NOT turn on backlights like most LCDs I've repaired but I can't locate a service manual for this model so I'm not sure if it's supposed to on this model.
SO far I've tracked down a replacement main board from one of my regular sources for around $120.00. Before I spend money for nothing...
Anyone have any good tips on confirming a little more clearly whether it's more likely to be a problem with the main or the pwr board? I have all the necessary test equipment, including a scope but without a service manual/schematic the test equipment is kinda useless.
TV: Westinghouse WD55UW4620
Main board is a CV6488H-A-20.
Power board is aAY155D-45F12
I'm an experienced tech - Any tips/advice (or a link to the service manual) would be gratefully accepted.
Comment