Re: Samsung UE37C6000 blows fuses
incandescent, 100W at 240V
odg
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Last Activity: 07-07-2019, 01:49 PM
Joined: 06-15-2019
Location: Lübeck
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Re: Samsung UE37C6000 blows fuses
The furthest I got was reading these numbers for the PFC IC ICP801:
either it is
1D10123
5591
or
1510123
5591
or
1010123
5591
when I google for any of the first numbers, i cannot find anything meaningful. If i search for 5591 PFC i find this: [url]https://www.alldatasheet.com/datasheet-pdf/pdf/422933/FUJI/FA5591.html[/url]
So I believe this should be it.Re: Samsung UE37C6000 blows fuses<br... reading theseLeave a comment:
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Re: Samsung UE37C6000 blows fuses
I now wanted to replace the PFC IC but I really couldn't read the numbers to order a new one. Do you have any idea how to find the exact name of it?...Leave a comment:
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Re: Samsung UE37C6000 blows fuses
So i finally got a new diode and MOSFET and soldered them in. I powered the TV with a lightbulb in series. The result was, that I heard a relay clicking, the lightbulb lightening up for a second, the relay clicked again and the lightbulb went dark. This repeats indifinetely, 1s on, 1s off, ...
When I power it on without connecting the power supply board to the other 2 boards of the TV, nothing happens, no relay clicking, lightbulb stays dark.
Do you think its the PFC? I guess if I didnt had the lightbulb in series, sonething...Leave a comment:
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Re: Samsung UE37C6000 blows fuses
The numbers on ICP801 were really hard to read. I believe it said 5591 and I found [url]https://www.alldatasheet.com/datasheet-pdf/pdf/422933/FUJI/FA5591.html[/url] which is also a PFC. So maybe correct, but I am not 100% sure.
That one has it's output on pin 7. I think there is no diode on the path from pin7 to the blown FET's gate pin. I drew the path onto the attached image. I havent found any shorts in that area
I removed DP803 and it was shorted.
What do you think? Should I give it a try with the...Leave a comment:
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Re: Samsung UE37C6000 blows fuses
Alright. Thanks. Could you please have a look at those questions again?...Leave a comment:
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Re: Samsung UE37C6000 blows fuses
I also found that all the 3 blue big resistors (RS807, RD849 and RD870) all have a short (i havent desoldered them). Should I also remove them and check again or could that be normal?Leave a comment:
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Re: Samsung UE37C6000 blows fuses
> it may have damaged icp801s
I cannot find icp801s. I can only find ICP801. Is it the one you are talking about? I can't identify any shorts on ICP801.
> You should at least check the gate drive resistor and diode
DP803 also seems to have a short (that's the diode you meant, right?)
What type of component is BP802? It is connected to the gate of the broken MOSFET (if I am not mistaken) and also has a short.
Is RP821 the gate drive resistor you were talking...Leave a comment:
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Re: Samsung UE37C6000 blows fuses
I removed QP801. It really has a short on all 3 pins. The remaining components i measured before now all seem to be ok. When eg. checking the big caps, my multimeter sometimes shortly beeps and then it stops, showing high resistance. It doesnt beep again. When I now switch the cables (so switching polarity) and test again, it again beeps shortly and stops etc.
Is this normal behavior because my multimeter maybe loads some caps or so? Or is there still something fishy on that board?
I will now get a new MOSFET and solder it...Leave a comment:
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Re: Samsung UE37C6000 blows fuses
Thanks for the hints. Very appreciated!!! I took some more pictures.
I checked the components (without desoldering):
Resistance across VX801S MOV is high.
The diodes of the bridge rectified BD801S all have a resistance of around 600 ohms, in both directions! I guess this is already a bad sign!? But I haven't desoldered it.
MOSFET QP801 has a short on all 3 pins
QP802 has a short on pin 2-3
QM803 and QM804 do not have any shorts
The 3 main filter caps:
...Leave a comment:
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Samsung UE37C6000 blows fuses
Hey guys, my Samsung LED TV UE37C6000 went black a few days ago. I found out that the 2 fuses of the power supply board PD37AF1E_ZDY were blown. I got new ones and both immediately blew again when I plugged the TV in.
I do not see (visually) any burnt components or any bad caps.
I have never identified such problem so I am rather clueless what to measure where and how to find the broken component(s). I guess it is some short circuit.
I hope someone can give me a hint. Thanks!... -
Re: New Members - please post your introductions here
Hey, I'm Timo and I studied electrical engineering but never went that route in my professional career. I found Badcaps while searching for tips how to troubleshoot my broken TV.Leave a comment:
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