In a DSE G1956 (Pacific Satellite rebadge) set-top box, there was no sign of power.
Connecting a computer power supply (with an average load) to the 3.3V, 5V and 12V rails did show that the main logic section was OK since it displayed a picture on a TV connected to the AV outputs.
Replacing all of the electrolytic capacitors in the power supply section did not fix the problem; it was later found that the KA5L0380R integrated PWM controller had a weak heart when the electrolytic capacitors in the power supply section failed without any sign of bulging
.
R17 (22R; originally interpreted as 10R) was discoloured and was replaced with a 1W unit.
Replace and upgrade the electrolytic capacitors mentioned in the circuit at http://www.eserviceinfo.com/download...DSE_G1956.html before it's too late!
Note that R18 should be 22R, not 10R
.
Connecting a computer power supply (with an average load) to the 3.3V, 5V and 12V rails did show that the main logic section was OK since it displayed a picture on a TV connected to the AV outputs.
Replacing all of the electrolytic capacitors in the power supply section did not fix the problem; it was later found that the KA5L0380R integrated PWM controller had a weak heart when the electrolytic capacitors in the power supply section failed without any sign of bulging
.R17 (22R; originally interpreted as 10R) was discoloured and was replaced with a 1W unit.
Replace and upgrade the electrolytic capacitors mentioned in the circuit at http://www.eserviceinfo.com/download...DSE_G1956.html before it's too late!
Note that R18 should be 22R, not 10R
.