I have an older Dell Optiplex 960 Windows 7 system that has been running fine for several years. Lately all Usb inputs have randomly stopped working (keyboard and mouse not recognized). I have run AV and SFC and MWB with nothing found. It does not matter which program is running (even in the middle of Solitaire) when problem occurs. Restarting PC does not fix the problem. Cannot enter BIOS SETUP MODE. However unplugging pc from wall power and replugging fixes problem for several days. Where should I look first to solve this problem,, or what actually gets depowered when unplugging a PC that is in the OFF state.
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Thanks to all for being__WAR_KITTENS____!
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Re: USB inputs fail
check the inside of the power supply for bulging or leaked capacitors.
i have seen this when the 5v standby voltage goes to shit.
dont ignore it - it can eventually damage the motherboard. -
Re: USB inputs fail
also check your device manager for code 10's on the USB controllerCap Datasheet Depot: http://www.paullinebarger.net/DS/
^If you have datasheets not listed PM meComment
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Re: USB inputs fail
I second this notion - I've seen bad caps on the 5VSB make USB and PS/2 devices drop out or act up. Given that it's a Dell, it probably has a Delta, HiPro, or LiteOn PSU. Many of those utilize CapXon, Teapo, and Ltec caps - none of which tend to last in the long run (especially the Ltecs)... which is a shame, because those PSUs are otherwise well-made. I usually recap them, though. After that, they are pretty much bullet-proof (save for a few specific models that do have known problems - but even these tend to be reliable overall.)Comment
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Hi all!
HISENSE 65E7KQ PRO
RSAG7.820.13512 - chassis
MT9618BAATAB - cpu
RSAG7.820.12059 - power
HD650Y3U77 - panel
KLM8G1GETF - emmc
The TV does not turn on, the standby indicator is on. All voltages are present.
Emms is dead. Not readable, not detected.
Replaced emmc.
But with another dump there is no launch
Terminal log
UART
<
AC_ON
RPMB key is not yet programmed
HASH1_VERSION=0x00000000 64bit
E-B
FDE enabled
layout pattern onebin by SAR7,0... -
Samsung LN46C630K1F – Intermittent Backlight, BN44-00341B Power Board
Summary for TL-DR readers:
• Backlight is intermittent, may come on with TV boot or not. No flickering, never fails during TV on.
• Have obtained Samsung schematic & service documents - Can upload if helpful.
• Have read ALL applicable threads
• C1818 and CP820 replaced as low hanging fruit
• CN802 data taken for normal and failed BL operation. SUMMARY: Pin 2 - 5vDet = 3.52 @normal, 0.0 @BL fail. Pin 6 - EPWM = 1.631 @normal, 1.058 @BL fail.
• VCC pin (18) of PFC... -
TV Model: Hitachi 40HYC42
Power Supply: 17IPS71
MainBoard: 17MB95M
Panel: VES400UNDS-2D-NO3
When the set came in it was dead. Fuse was open primary side and the power mosfet was shorted. So I ordered a new power supply. Now it turns on, only displays "Hitachi" and then power off red and blue led flashing.
I had to modify the 0ohm resistors in the led backlight of the new PS like the original power supply.
Is there any variants on 17IPS71 power supply's?
UART output pins 10 and 12 on scart connector:
...Code:12:24:04.595
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This is for car audio amplifiers but I doubt that matters. There are amplifiers that use the same make/series capacitor as a different manufacturer and they consistently fail in one brand. In the other they are OK. The amplifiers are from the same era. Is it possible that the heating profile used when flow-soldering the boards could be the reason for the failure? If not, any ideas on what the difference could be? -
Hi sirs. please help
Dell Inspiron 5775 bios locked "Unlock Setup fail"
After generating the Password Recovery code, I go to the “Security” tab - “Locked Settings” - it says “Unlock Settings? I tried many wrong passwords and it shows an error to unlock settings [ Press any key ].
What I did:
I read the bios dump.
Downloaded the bios update to 1.6.0 from the official Dell website, extracted the dump from it, updated the bios, but the problem persisted. Please help me to solve the problem....
Comment