Circuit Analysis and Unconventional Troubleshooting, PT90+ Chassis
Repair of the PT90+ chassis power supply
0:00 TV defect
0:49 voltage on the collector of the horizontal transistor
1:12 checking the capacitors
1:30 preparing the chassis for repair
2:44 plan for checking the power supply units
5:20 starting the chassis with a donor
5:55 checking the voltage regulation units of the power supply
7:53 connecting the chassis to check the TV units
8:28 checking the strapping of the PWM controller of the power supply
9:50 checking the TV after repair