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Old 10-22-2020, 04:34 AM   #1
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Join Date: Jul 2019
City & State: Singapore
My Country: Singapore
Line Voltage: 230VAC 60Hz
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Posts: 169
Default Tefal GV8962 Pro Express steam iron - no power

I am trying to save a donor steam iron with no power supply.
Dismantled and initial visual check on the power supply PCB - there is no fuse anywhere, and resistor is quite obviously burnt. Can't really read to color code, guessing it could be 100ohm (brown, black, brown, gold) or 180ohm (brown, grey, brown, gold).

Replaced the burnt resistor with a trial 5W 100ohm resistor for quick test, power on, and it immediately blown a 100nF 50V capacitor nearby.

Suspect a short circuit somewhere, I try to checked a few more obvious components before seeking help from here:
1) Transistor SCR(labelled on the board), marking is X0602 - do not know how to test.
2) Transistor TR2(labelled on the board), marking is Z0103 - do not know how to test.
3) Bridge rectifier - do not see a single component with 4 leads as advised, but found the 4 diodes labelled D1-D4. D1,D2 and D4 are SMD at the circuit side and measured ~703ohm one direction, infinite reversed. D3 is on the components side, measured ~ 31ohm both direction.

Please help, thank you.
Attached Images
File Type: jpg PCB-ComponentsSide.jpg (1.70 MB, 25 views)
File Type: jpg PCB-CircuitSide.jpg (2.71 MB, 20 views)
File Type: jpg Burnt-Resistor.jpg (474.3 KB, 13 views)
File Type: jpg 5W-Resistor.jpg (526.1 KB, 15 views)
File Type: jpg Blown-Capacitor.jpg (472.6 KB, 17 views)
File Type: jpg Z0103.jpg (238.4 KB, 13 views)
File Type: jpg x0602.jpg (266.9 KB, 13 views)
File Type: jpg Diode-D1D2D4.jpg (483.8 KB, 10 views)
File Type: jpg Diode-D3.jpg (226.6 KB, 11 views)
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