Re: Compal LA-F951P DH5VF schematic needed
Thank you!
kronikus
Senior Member
Last Activity: 03-13-2023, 11:11 AM
Joined: 02-19-2015
Location: Zagreb
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Re: Need A1708--820-00840-01 schematic with boardview
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Re: 820-01521 schematic
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Re: Acer Aspire V17 Nitro VN7-791 Nvidia GTX960m 3rd phase GPU died
@sercanuzun: As long as type, capacity, and voltage of capacitor are matching, any other sign is not important. Try to find parts that have as highest temperature ratio, if possible. I'm sure that burned ones are exact the same as one that remains alive. Thermal pad must be quality one because is on hegh temerature components...Leave a comment:
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Re: Acer Aspire V17 Nitro VN7-791 Nvidia GTX960m 3rd phase GPU died, boardview needed
It is not clear on the picture does those two components looks burned or look like have some residue on. But it is not transistors but capacitors. And it is best practice to replace all 3 of them with good quality ones. You can find these parts in better electronic shops or online; Mouser, TME.... This tape is not insulation but opposite - thermal conducting pad, which has to be in firm contact with elements and cooler.Leave a comment:
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Re: Asus G751JY not turning on when touchpad is connected
[QUOTE=SMDFlea;891334]You could replace D3110 first as the cheapest option, also check caps C3-C5 on the touchpad,trace where pin 3 goes. A replacement part if you can`t get the AZC099-04SP is NXP PUSB2X4D
On motherboard without touchpad connected:
Difference between measuring TP CLK and TP DAT resistance to ground are dependent only on presence or absence of power supply (laptop not tuned on). Without battery or charger resistance is about 7k ohms. When battery or charger is present, resistance...Leave a comment:
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Re: Asus G751JY not turning on when touchpad is connected
Firstly I unpluged the battery, than removed D3110 diode chip and measured resistance. Both TP CLK and TP DAT now was about 7k ohm to ground, same as SMB CLK and SMB DAT.
RN 4043 resistors are both 4.7k ohm as stated on boardview. CORE_PWRGD to 3.3VS resistor R5802 are 2k ohm, also.
BUT - one important thing that I didn't mentioned before!
I measured 7k ohm without battery or charger!
When I connected the battery, resistance without D3110 was same as before - on TP CLK and DAT both...Leave a comment:
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Re: Asus G751JY not turning on when touchpad is connected
Here it is. This picture origins from internet but it's same as my board.
Chip is marked as 33200D-3000 1448 BG14B01 or (BQ1)...Leave a comment:
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Re: Asus G751JY not turning on when touchpad is connected
What confusing me is fact that pin4 also have 25 ohm resistance to ground but 3.3V is present all the time when laptop is on. On touchpad board "only" SMB DAT and INT# are shorted. TP DAT and TP CLK are not.
1. Is that 3.3V normally "generated by KBC" and, because of KBC fault, pulled down by short in KBC itself? If it is - how would be possible for laptop to work, even without TP attached?
2. Or that 3.3V is genereated by system +3VS, than pulled down by KBC if certain conditions are not met?...Leave a comment:
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Re: Asus G751JY not turning on when touchpad is connected
Mesaured on motherboard, turned off, without attached TP cable:
Pin 1/2=3.3Vin - 250 ohm
Pin 3=TP CLK - 25 ohm
Pin 4=TP DAT - 25 ohm
Pin 5/6=GND - 0 ohm
Pin 7=SMB DAT - 4k ohm
Pin 8=SMB CLK S - 5k ohm
Pin 9=Right BTN - 9M ohm
Pin 10=J5602 INT# - 10k ohm
Pin 11=Left BTN - 9M ohm
As I can see, signals on both pins without attached cable are about 80mV amplitude on about 30kHz.
Does that 25 ohm and that signals on TP CLK and TP DAT seems ok or I...Leave a comment:
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Re: Asus G751JY not turning on when touchpad is connected
I hope that you are right. In fact, I just measured on touchpad board without connection to motherboard that SMB DAT (pin7) and V5620 INT# (pin 10) have only 2 ohm resistance to ground and 2 ohm between each other. Now I need to check motherboard but is safe to say that the touchpad controller is shorted. Chip have markings 33200D-3000 1448 BG14B01 or (BQ1).Leave a comment:
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Re: Asus G751JY not turning on when touchpad is connected
TY. The cable is correctly positioned, new and tested pin by pin. I will try to find the chip or touchpad. No luck, so far. Only possible solution there is to buy complete palmrest and it is not cheap one. And I'm affraid that there is posibility that the EC chip is bad.Leave a comment:
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Re: Asus G751JY not turning on when touchpad is connected
Anybody?Leave a comment:
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Asus G751JY not turning on when touchpad is connected
Hi, I don't know history of this problem. When I bought this laptop everything works fine except touchpad and buttons that are not found as hardware in device manager. Than I opened laptop and found that TP cable is missing. I ordered replacement cable, mount it and found that laptop cannot be turned on. Does not matter if any of other cables attached or not (keyboard, LED, KB light), when I connect touchpad cable, LCD remains dark, no fan spin, and after 30 seconds power button light turns off. When I unplug TP cable, everything works perfect. I don't have schematics, but I did some measurements...Last edited by kronikus; 03-27-2019, 09:19 AM. -
Re: Lenovo Z50-70 ACLUA ACLUB NM-273 boardview needed
Thanks I have this schematic but many parts are different as well as on ohther schematics I have.Leave a comment:
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Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery
Yes, It is power loss. Laptop suddenly turns off and stay off.
I tried another charger and other battery, too. Nothing changed.Leave a comment:
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Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery
Some tests. I removed RTC battery so don't pay attention to the time....Leave a comment:
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Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery
On both side of PR316 voltages are same as on the Drain of PQ303.
Voltage drop across some coils:
PL303 8.2mV; PL304 9.9mV; PL307 1.7mV; PL701 5.9mV; PL9 6.9mV.Leave a comment:
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Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery
On battery, turned off:
Drain/Source/Gate
PQ302 15.2/14.8/14.5
PQ303 15.2/.15.2/0
PR306 0(VIN side)/0(diode side)
On battery, turned on:
Drain/Source/Gate
PQ302 15.3/14.9/14.6
PQ303 15.2/15.2/0
PR306 0(VIN side)/0(diode side)
On charger with battery, turned off:
Drain/Source/Gate
PQ302 20/20/5
PQ303 16/20/20
PR306 20(VIN side)/0 (diode side)
On charger and battery, when turned on and than removed battery, PQ303 Drain...Last edited by kronikus; 12-21-2018, 10:55 AM.Leave a comment:
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Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery
Ok, I'll do measurements on PQ 302/303 and PR306.Leave a comment:
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