Tefal GV8962 Pro Express steam iron - no power
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Re: Tefal GV8962 Pro Express steam iron - no power
Now about D3, what other bad components would cause the 2 solder points to read, with or without the D3, 30ohm both ways?Comment
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Re: Tefal GV8962 Pro Express steam iron - no power
Your pic #1 bottom right. TR2 looks like it is damaged a little on the top. What is printed on TR2?Comment
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Re: Tefal GV8962 Pro Express steam iron - no power
Yes, that was a very bad idea actually. In this case this resistor is a flame proof (green colour) resistor that is used a fusible resistor. Now you putting is there a 5W resistor, I am not sure if that is actually the only damage it did (blowing that 50V cap).Comment
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Re: Tefal GV8962 Pro Express steam iron - no power
Yes, valuable lesson learnt, thank you.Comment
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Re: Tefal GV8962 Pro Express steam iron - no power
The value of that fusible resistor will be likely be <10 Ohms.
https://ar.pinterest.com/pin/621848661029499082/Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Tefal GV8962 Pro Express steam iron - no power
The value of that fusible resistor will be likely be <10 Ohms.
https://ar.pinterest.com/pin/621848661029499082/Comment
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Re: Tefal GV8962 Pro Express steam iron - no power
I moved one of the 2 relays, and here's a findings:
1) The pins (red arrow) reads 1569 ohm
2) I applied 12V, both directions, to these pins thinking it should click, but it does not.
3) The in-circuit relay also reads 1569 ohm, and also does not click when applied 12v to the coil pins.
Is this normal?
Next I removed the inductor L2:
1) I don't have DMM that read inductance, but resistance reads 1.8 ohm.
2) With L2 moved, D3 now reads correctly at 579 ohm in one direction only.
Does this means L2 is bad and shorted?Comment
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Re: Tefal GV8962 Pro Express steam iron - no power
The buck converter looks to be set up for 24V output, you can verify that by checking the value of the feedback resistor network , that is why the blown up C2 is rated at 50V, twice the operating Voltage.
I would not pull the relay out, you should concentrate on what component are connected to + lead of that filter cap C2. if you check the resistance between the two legs of the filter cap c2 solder pads, what do you get, 30 Ohms?Last edited by budm; 10-26-2020, 01:03 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Tefal GV8962 Pro Express steam iron - no power
I trace out the relay driver, the buck converter is set to 24V for the relay coils.
Transistor T2 drives the relay REL1Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Tefal GV8962 Pro Express steam iron - no power
With Inductor L2 removed, D3 measured correctly at 579 one way. When removed, it measured 30. Seems to by-passed to a shorted circuit somewhere?
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Re: Tefal GV8962 Pro Express steam iron - no power
The buck converter looks to be set up for 24V output, you can verify that by checking the value of the feedback resistor network , that is why the blown up C2 is rated at 50V, twice the operating Voltage.
I would not pull the relay out, you should concentrate on what component are connected to + lead of that filter cap C2. if you check the resistance between the two legs of the filter cap c2 solder pads, what do you get, 30 Ohms?Comment
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Re: Tefal GV8962 Pro Express steam iron - no power
D3 is basically in parallel with the load through the Low DCR of the Buck inductor, that is why you see 30 Ohms when D3 is measure in the circuit, look at the circuit of the Buck converter then you will understand why.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Tefal GV8962 Pro Express steam iron - no power
I would have thought he had removed that blown up cap already since it is blown up, if not then I do not understand why it is not removed.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Tefal GV8962 Pro Express steam iron - no power
Not sure where to trace further...Comment
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Re: Tefal GV8962 Pro Express steam iron - no power
I decided to restore all the good and new components back into the PCB and do a basic continuity check - new 2W 100ohm R1 resistor, new 50v 100uF C2 capacitor, new U1 LNK304, and the original L2 inductor.
All pretty much the same, except now D3 now reads 579 in circuit.
I connect a 40W incandescent bulb between the Live wire of the incoming power. Power on - the incandescent bulb do not light up at all, the I measure to incoming voltage to the PCB - 243V.
But pressing the power button of the device - nothing happened, nothing blown, no led light.. Something component(s) blown opened?Comment
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Re: Tefal GV8962 Pro Express steam iron - no power
So now you are saying the resistance on C2 no longer show 30 Ohms?
Do you have 24Vdc on C2?
You also need to find out if you also have low Voltages to runs those IC or notNever stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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