Archimedes
Member
Last Activity: 10-24-2024, 12:13 PM
Joined: 07-30-2024
Location: Istanbul
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There was a short circuit in a mosfet in the hot area, I replaced it, I also replaced the ISL 95836 IC. Power came back but still the blank screen continues. -
When measuring the detail voltages on the motherboard with ram, cpu and power button mounted only, little later the fans slowed down, the DJ-jack light was on unusually long, then there is no power at all and there is no DC-jack light either. It seems that in this new issue now there is a short circuit on the motherboard. 19.5V drops to 0.5V when plugged in. Same result with another power adapter. Now this is a new situation to solve before the blank screen issue. Why this happened? Any idea what to follow first?...Leave a comment:
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May be ISL 95836 HRTZ is the suspect IC. Some pins are short circuited. I will order one. In the datasheet it is written "[FONT=Arial]ISL95836 provides a complete solution for microprocessor and graphic processor core power supply. It provides two Voltage Regulators (VRs) with three integrated gate drivers."[/FONT]May be ISL 95836 HRTZ is the suspect IC. Some pins are short circuited. I will order one. In the datasheet it is written "[FONT=Arial]ISL95836 provides a complete solution for microprocessor and graphic processor core power supply. It provides two Voltage RegulatorsLeave a comment:
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The long black plastic isolation tape under this area is no longer flat as in the photo, it is now swollen with many bubbles, there is definitely too much heat than before.Many components on the board are not numbered it is very difficult to locate them in the schematics. I couldn't find the boardview file (cad) for this motherboard in the internet. If anyone can help me out on where I can find this, I'd be very appreciated.Leave a comment:
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Now I am using minimum possible parts. The motherboard alone without the usb & audio output board, no ssd, no wifi board, no internal screen, no backup battery, nothing on it, but only the cooling fans, the power button, one ram and the power supply connected and also an external hdmi screen. It must display at least few words after the bios boot. In this motherboard just after the AMD HD7850M GPU chip is replaced with a new one I am detecting with my fingers a heat more than normal in the power chips area located in the down part of the both sides. Pls. See attached photos. I couldn't find...Leave a comment:
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Hi mcplslg123, thank you for the answer. Total 4 usb 3.0 in this laptop. None of them has physical damage in their pins. (Display ports and hdmi port don't have any damage either.) 2 usb in the at right side mounted on the motherboard. D+ and D- in both shows 146 kOhms to the ground. 2 usb are on the extra board which is connected to MB by cable. One shows 157 kOhms to the ground by the pins D+ D-. The last one shows 2 MOhms in each. All of the usb ports can read without problem. I have a flash disk with led light, for bios update. All of them are working....Leave a comment:
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And the device manager details...
Can anybody point out which components or the board part seem faulty?
Status Class FriendlyName
------ ----- ------------
Unknown USB USB Composite Device
Unknown Mouse HID-compliant mouse
OK System System board
OK Volume Volume
OK System Motherboard resources
OK System Motherboard resources
Error Mouse PS/2 Compatible Mouse
OK Volume Volume
OK MEDIA Microsoft Streaming Service Proxy
OK System Microsoft ACPI-Compliant Embedded Controller
OK System Motherboard resources...Leave a comment:
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[FONT=Arial][COLOR=black]Additional information about the blank screen issue.
The HP power adapter smart pin voltage is 18.5V when not connected. When connected, it measures 1.08V regardless of power on or off.[/COLOR][/FONT]
[FONT=Arial][COLOR=black]Another info about the blank screen issue.[/COLOR][/FONT]
[FONT=Arial][COLOR=black]The problem devices list created by Windows11 :[/COLOR][/FONT]
[FONT=Arial][COLOR=black]Microsoft PnP Utility[/COLOR][/FONT]
[FONT=Arial][COLOR=black]Instance ID: ACPI\SYN1E67\4&30193793&0[/COLOR][/FONT]...Last edited by SMDFlea; 08-01-2024, 02:58 PM.Leave a comment:
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HP Envy 17-3290NR 3D Blank Screen - motherboard Louis V1.1 6050A2489901
[FONT=Arial]Subject is a blank screen issue in HP Envy 17-3290NR 3D version laptop with motherboard Louis V1.1 6050A2489901 MB-A02. Production year is 2012. This one is a 2nd hand motherboard which I could use it for few months only. Suddenly no output from the internal display and also no signal from HDMI port then Windows out of order after few boots.[/FONT]
[FONT=Arial]Caps lock working normally and no HP's caps-lock warning blinks. Making a hard reset and [COLOR=black]replacing the RAM sticks or using different slots didn't help.[/COLOR][/FONT]
[FONT=Arial]Fans are... -
Hi all group members,
Electronics is a longtime hobby for me I think I'm not very bad. I can do fine repair works. I have my own designs in audio analog systems and in auto control systems. I can repair a lot of things, the last I repaired my Pioneer SX950 amplifier, CTF1000 tape recorder and my Nikon digital film scanner. I am a software engineer from the years 1980. But familiar also with today's computers.
Kindest Regards...Leave a comment:
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