DHT112A
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Jan 6, 2005, 4:24 AM
Post #1 of 1
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CTC169 power supply problem
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I have a Proscan 35123 with a CTC169 circuit board. I have the board out of the unit on the bench. When I apply power my standby voltage at CR4116 is 200 volts. It is only supposed to be 143. I have replaced all the components in the power supply, U4101, C4104, C4108, C4102, CR4101, CR4106, CR4122, Q4101 and CR4118 to no avail. I have tried more than one of each in replacement. I have checked the resistance of all resistors. Found R4102 was 4700 rather than 5100. Replaced. Is the flyback transformer used in the power supply regulation to pin 2 on U4101. The voltage difference between CR4101 & 4106 is 2 volts and is only supposed to be 1 volt.
On U4101
pin 16 is 15 volts.
pin 15 is 15 volts
pin 14 is .7 volts
pin 6 is 3.5 volts
pin 7 is 3.5 volts
pins 10 & 11 3.5 volts
pins 1,2 & 3 are 0 volts
What am I missing? Help Please.
   
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