This is hp 15s i5 11th Gen motherboard LA-K201P device is booting up fine and working normally as long as its connected to the charger. On my initial check I thought it was dead battery issue and externally charged each cell and then we have 9% battery percent but as soon as I unplugged the charger device turned off immediately then I checked the voltage motherboard was supplying to the battery and it was 0.2V then I followed the 19V supply from the charger and throughout the motherboard 19V supply was okay then at one particular mosfet (PQB13 image attached below) 19V goes in and comes out 0.2V where it should supply 12+V, I interchanged PQB12 and PQB13 but still the 12V supply was missing. Please help me troubleshoot this faulty motherboard and I'm newbie on laptop motherboards so please guide me.
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Hi everyone,
I've been troubleshooting a Mac Mini A1347 (820-5509) that came in for a simple thermal paste replacement, but it turned into a challenging repair. I've made some progress, but I'm stuck at a point and could really use some advice from those more experienced with this board
Worked fine for a week, then started powering on intermittently.
What I've done so far:
• Found PP3V3_G3H in short.
• Removed and replaced an AND gate (74LVC1G08) and an OR gate, which were causing issues on the line.
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I have a TCL 55P6US with sound and backlight but no picture. This model does not have a T-CON board, and the right (rear perspective) panel board is fed from the left panel board. I have not been able to induce any change by disconnecting the secondary panel board or the tape cut-off method on the primary board.
There are a bunch of voltages missing on the panel boards. I can't find any shorted caps of the panel boards, and all of the missing voltage rails read in the kiloohms, which leads me to suspect the issue may lie on the circuit board, rather than a short in the panel.
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Board had no history of liquid; unsure of drop history, but no signs of damage of any kind worth noting.
Charger sitting at 5v/0a. PPBUS is at 1.9v-0.9v steady cycle (peaks, drains, loops). Confirmed CHGR_EN_MVR is missing, but DCIN was reaching ISL just fine, so replaced ISL--no change at all. Confirmed pp3v8_aon is also missing--and being unsure *exactly* which signal appears first (or if they are simultaneous), I inspected PMU/U8100 area and found no shorts, but also found PP3V8_AON_MPMU_ISNS_VIN missing (not shorted). Replaced U8100 just in case (have had them fail in weird ways),... -
Hey....
Board as written in description was stuck at VGA LED. common Problem wit these type of bords.... tried all the "standard stuff" like resettin... reseatin.... found out the LED Controller MCU1 = IT8295FN-56A geting burning hot under the last PCI Slot.. now i desoldered it cause there were only 18 ohms at the caps arround.... another aorus x470 in working condition with similar part and nearly same layout had arround 280 ohms...
my question is: why doesnt the board start know without this chip.... worked myself through the boardview but i can´t understand...
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