Next to 3.3V LDO which is only active rail after main rail is a circuit which sends voltage to EC chip. I don't understand at all function of this circuit. It consist of 2 PNP transistors few resistors and P-channel mosfet. Below is a circuit diagram of that part with explanation. Does anybody...
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INTERSIL 9238HX126HV datasheet
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Epson L3210 DUMP
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02-15-2025, 10:50 AM
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Badcaps Statistics
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Topics: 218,649
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Active Members: 24,173
Welcome to our newest member, Mihály Dr. Tóth.
Latest Topics
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by CeciliusHi, I just come to this laptop with symptoms from owner - it stop charging. Thought it would be easy USB-C replacement (matebooks known issue) I took it. But port is good. After charging battery from power supply laptop is still dead. No power to EC chip. I'm out of ideas what to check next.
Next to 3.3V LDO which is only active rail after main rail is a circuit which sends voltage to EC chip. I don't understand at all function of this circuit. It consist of 2 PNP transistors few resistors and P-channel mosfet. Below is a circuit diagram of that part with explanation. Does anybody...Today, 07:52 AM -
by ManucslHello.
My TV is a QE65Q800TATXXC Samsung TV.
Issue : When you plug the 220V, voltages are OK on the power board and you can hear the click from the relay, but TV is not starting when power button is pressed. Red led is blinking when you press power button. But no images or sound ( Back-light is off )
Then if you disconnect the cable from the main board to the power supply, the TV back-light turns on.
Any ideas to check would be very appreciated 😊
After reading some posts on this forum, I suspect a bios issue so I bought a CH341A to dump it....Today, 07:47 AM -
by L.L.Greetings all, could you please assist with the unlocking of this BIN
Samsung NP300E5C
Board Number: BA41-01979A
I've tried many files and it didn't work.
Please find attached the BIN
...-
Channel: BIOS Requests ONLY!
Today, 07:36 AM -
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by phantomEVOHi to all, i don't know the real history of this board.
the technician who gave me this board says: "i don't know the history of this board, it not switch to 20v. i have changed ub300 and ub400, than i've discovered to have short on 5v andi i have changed u7650. still 5v not switching"
so under microscope i've found
- shorts on rb246,rb401,rb400
- u7650 (tps51980b) changed with (tps51980A)
- j6640 melted (maybe some one has reflowed or changed u3100 or u3200?)
so i've bouth another identical board anche...02-12-2025, 03:58 PM -
by irfan-1Hiya my HP OMEN 15-DH1005NA not working so i opened it to check the voltage, when i check the ac adapter power i see 19.9v which looks fine but when i connect the battery to the motherboard the ac adapter power starts to lower down from 19.9v to all the way to 0v,
to get the ac adapter power back to 19.9v i need to unplug it for a few seconds and plug it back so it will work as 19.9v again,
anyone has any idea why this happens???02-09-2025, 11:31 AM -
by fonteene21Please help. The lock on the 15p connector that connects to the keyboard on my Lenovo ThinkPad L13 Gen3 Model 21B4-001XJP is broken and I want to replace it, but I want to know the manufacturer and part number so I can order the part. I want a board view.2 PhotosToday, 06:57 AM
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by PacoGTHello friends, I have a question. They brought me this video card, a DELL RTX 3080. They told me that it fell and the impact no longer produced video.
When trying it, it's as if it wanted to give video but in the end nothing, I already checked voltages etc. everything is as it should, but without video
I suppose it could be a bios problem but since sometimes they don't tell you everything, I've searched for the bios everywhere but without success
I can't find a backup or something to try to reprogram bios and see if it's the fault, could you help me maybe someone has one that...Yesterday, 01:08 AM -
by PennyLaneHi
I'm trying to locate what i believe to be Radial Electrolytic Capacitors 100v 82uf Non-polar for a Skytec Crossover filter.
Thanks1 Photo-
Channel: Troubleshooting Audio Equipment
Today, 06:47 AM -
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by Sully114Hi, I have a bunch of old GPUs im using to learn pcb repair and microsoldering. The card has artifacts whilst running and display cuts out if you try to game on it. After initial testing I have found that the memory inductors are showing 12v each side. So being a bit of a noob at this stuff, Im assuming I would have to replace the inductors and find the broken mosfett that is causing this. Im going to add the results of my stabbing guide here tomorrow which should further help the situation. In the meantime are there any boardviews I can use as reference for this card? Heres a pic of the pcb...Yesterday, 07:30 PM
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by BrownDog56i need a overview of a satellite board LA-6841P more important the ratings of mosfets & type as missing components on the board ,Tia
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Channel: Schematic Requests ONLY!
Today, 05:47 AM -
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by BrownDog56i need a overview of a satellite board LA-6841P more important the ratings of mosfets & type as missing components on the board ,Tia
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Channel: Schematic Requests ONLY!
Today, 05:47 AM -
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by StephenBoard was just repaired, great thing for us since the DATA was recovered, however the battery was just replaced with a brand new OEM battery and holds the charge well, I plug it in and the charge icon comes on (lightning bolt) then it goes off and comes back again and repeats itself, The MagSafe 3 Amber light is turning off and on constantly, which is telling me something else is going on, before I pull this board out again I was wondering if anyone has come across this issue since its a little new to me on this model. Battery is holding the charge well at 52% but it won't charge further, I checked...02-12-2025, 04:41 PM
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by ManucslHello.
My TV is a QE65Q800TATXXC Samsung TV.
Issue : When you plug the 220V, voltages are OK on the power board and you can hear the click from the relay, but TV is not starting when power button is pressed. Red led is blinking when you press power button. But no images or sound ( Back-light is off )
Then if you disconnect the cable from the main board to the power supply, the TV back-light turns on.
Any ideas to check would be very appreciated 😊
After reading some posts on this forum, I suspect a bios issue so I bought a CH341A to dump it....Today, 07:47 AM -
by L.L.Greetings all, could you please assist with the unlocking of this BIN
Samsung NP300E5C
Board Number: BA41-01979A
I've tried many files and it didn't work.
Please find attached the BIN
...-
Channel: BIOS Requests ONLY!
Today, 07:36 AM -
-
by fonteene21Please help. The lock on the 15p connector that connects to the keyboard on my Lenovo ThinkPad L13 Gen3 Model 21B4-001XJP is broken and I want to replace it, but I want to know the manufacturer and part number so I can order the part. I want a board view.2 PhotosToday, 06:57 AM
-
by PennyLaneHi
I'm trying to locate what i believe to be Radial Electrolytic Capacitors 100v 82uf Non-polar for a Skytec Crossover filter.
Thanks1 Photo-
Channel: Troubleshooting Audio Equipment
Today, 06:47 AM -
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by lavchykI'm such a laptop with a password. CXCZX33-8FC8
are there options to unlock?-
Channel: BIOS Requests ONLY!
10-14-2020, 06:29 AM -
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by Sik_6ty_SixxSo like the title says, I have an old Stereo Receiver/Amplifier that I picked up from the goodwill, it's a HH Scott Model A510. When I first got it home it had zero output. Opened it up, notice the fuses are missing. Pop in 2 new fuses (AGC4A 250V) and try again, within 5 seconds the L channel fuse POP! I don't see any visible indications of damage or arc burns on the PCB, no popped resistors or diodes, no burnt traces or blown out caps. So I decide to just try another new fuse, POP. Swapped around my R and L speaker wires, and checked the integrity of all wires and connections. Everything looks...5 Photos
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Channel: Troubleshooting Audio Equipment
Yesterday, 05:06 AM -