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Help ! Lenovo X280 doesn't start

junkudo

New Member
Joined
Jun 17, 2022
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Hi guys

Lenovo X280 does not turn on.
Please help me someone.
The model of the motherboard is NM-B521.

The problem is as follows.

-"USBC_HV_GATE", which is the gate signal of the 20V MOSFET (Q263, Q264), is not output.

-The output source IC is U192: TPS65988, and 20V is applied to the IC chip.

-Replacing the tip does not improve it.

-I checked all power rails , but I couldn't find any short circuit.

Also, can anyone tell me what the abbreviation for HV is?
 
Joined
Aug 28, 2021
Messages
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Also, can anyone tell me what the abbreviation for HV is?
Most likely: high side mosfets.
How are you working on this board ? Any schematics or pictures to share . A
-Replacing the tip does not improve it.
The tip ? If you mean chip plz mention which chip isit .
History of the motherboard helps a lot .
 
Joined
Jun 16, 2022
Messages
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System Name MESIN TEMPUR
Processor INTEL XEON L5420
Motherboard MSI P35 NEO2
Cooling Deep cool ice edge mini fs v2.0
Memory 8 Gb
Video Card(s) Radeon HD 7770
Storage SSD 512Gb + HDD 2Tb
Display(s) LG Monitor 24 inch
Case Dark Flash Aigo
Power Supply Corsair CV 450 W
maybe u can attach some picture from the motherboard for any suggestion
 
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