Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Troubleshooting Power Supplies and Power Supply Design
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 10-22-2020, 04:34 AM   #1
beetle1303
Senior Member
 
Join Date: Jul 2019
City & State: Singapore
My Country: Singapore
Line Voltage: 230VAC 60Hz
I'm a: Knowledge Seeker
Posts: 169
Default Tefal GV8962 Pro Express steam iron - no power

Hi,
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)
beetle1303 is offline   Reply With Quote
 

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums 2003 - 2021
Powered by vBulletin ®
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 09:04 PM.
Did you find this forum helpful?