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Logitech Z906 Power Supply
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Re: Logitech Z906 Power Supply
Do not replace D22 if it's not shorted and shows conduction one way only (around 450mV measured on diode range). Replace R29 and R45 2Ω resistors, R24 510Ω resistor (they are quite often burnt if Q1 and Q2 are shorted), five 0.330Ω/1206 resistors in parallel, Q1+Q2 and both 2.5A fuses. You may also need to replace the SL12 NTC thermistor as it is sometimes also affected on these PSU boards (you can see a burnt hole on its surface if damaged). The value of NTC is 10Ω. In some cases U1 is affected too and the PNP transistor next to it. The actual marking for this transistor is ZXTP25020CFH so it must be an exact replacement as it is specific 4A transistor in SOT23 case.
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