Hello,
you should desolder the 4C08N and check. A N channel mosfet should be about 0.5V in diode mode....
Patrick501
Senior Member
Last Activity: 12-07-2025, 11:25 AM
Joined: 10-29-2024
Location: west
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thansk for your answer. Iordered the part yesterday so it will probably be here by monday next week. I will keep you informed.Leave a comment:
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after almost a year I dug out the chromebook again.
I noticed a very low resistance of 2 ohms on a 3.9K resistor. When I inject 1V@0.5A the MP2940A heats up.
I was wondering what the PSYS pin is for? It connects the ISL9241 with the MP2940A
Does it mean the MP2940 is leaking or is it supposed to have a very low resistance?...Leave a comment:
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does this help?...
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the white part is where the screen is disconnected....Leave a comment:
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I'm probably gonna get a second TV, exact same model. I will switch parts then and see which one is at fault. So I can repair both of them.
Thanks for your help and knowledge! I really appreciate it.Leave a comment:
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I couldn't find any damage on or around the connection of the panel
I felt like this TV had a million of screws to get to the panel.Leave a comment:
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so you think, when I inject the 12V into the disconnected T-con (screen connected of course) there has to be a visible difference on the lcd? If not, it not a SOC issue?
Is that correct?...Leave a comment:
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would it even be possible according to my tests of my first post that a broken panel cause this kind of error?
I'm thinking about giving the SOC a reball. I hope I have the right stencil here...Leave a comment:
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I removed the metal holders (if you mean them) but there's nothing under it...
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Can you tell me where this u shaped ribbon cable is supposed to be? I can't see anything like that....
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I disconnected the lvds cable between MB and T-Con. Backlight comes on, connected 12V to fuse but the screen stays dark. I soldered a cable on the fuse. So the connection is 100% and it definitely has 12V....Leave a comment:
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there you go...
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I downloaded the file, unzipped, put the file on a USB Stick (FAT32, MBR) and plugged it into the TV.
After abot 3mins the TV rebooted. Nothing changed. Do I have to wait any longer?...Leave a comment:
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only resistors and caps, no tvs...Leave a comment:
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Philips 55PUS6704 no picture, backlight ok
Hello,
I'd like to repair a Philips 55PUS6704.
It turns on and you can see the backlight, hear the sound but no picture.
When I disconnect one of the T-con cables, half of the screen turns white.
right cable disconnected= right side white
left cable disconnected= left side white
When I tape like 6 or 7 pins of one cable it looks like the picture attached. I already tried another T-con board without success.
There are no shorts on the the mainbaord and the two lcd panel boards...at leat I couldn't find any.
Also you can notice one single... -
reformatt
thx a lot for your advice to look for the PCH.
I have a pretty similar but not the correct boardview and schematic. Only for the previous moldels with the seperated CPU/PCH. So I didn't notice.
Anyway, the relevant rail shows a low resistance but not zero. When I inject 1V into this 3V3 rail the PCH Chip on the CPU heats up...not very much but if I injected the actual 3v3 it would definitely get hot. Ain't gonna try tho.
In this case no repair possible
Maybe I can find a working mainboard online or the same model with a broken screen......
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this would be a no fix since it's a one chip BGA solution, PCH and CPU....Leave a comment:
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I changed the EC today. Shorts are gone in this area. Apparently it's working or at least it tried because the USB3.1 controller overheated. There was definitely no power before.
This computer got here because of an short at or close to the USB-A Port....Leave a comment:
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thanks for your answer.
I will give it a try then. I removed the EC today and the shorts are gone.
What I'm concerned about is that two CPU coils show a very low resistance to gnd. I know cpu rails can be low but 0.7ohms on this isn't very much....Leave a comment:
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