LG 55LB5900 Totally Dead!
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by Mike RussellMachine won't power on, no power led, no fan spin, completely dead.
Checked PQ5400 - AONS32314 and pins 5,6,7,8 are 20v (AC adaptor voltage) but pins 1, 2, 3, 4 are 0v.
Following Gate Pin 4 to PU5400 - BQ24780SRUYR.
VCC 20v
ACDET 2.8v
ACDRV 0v (goes to pin 4 gate of AONS32314).
ACOK 0v
REGN 6v
According to datasheet, conditions are correct for ACOK to be high but it is not.
Tracing ACOK it's connected to ACIN which is connected to a pin GPB0 of IT8227 but also shown as connected to +3VL via a 100k resistor... -
by phantomEVOhi to all! please help with 2 imac 21,5 dead...
i already changed u7700 in both without luck
u7700 pin 17, 18, 5, 4, 24, 12
have those voltages in both imac..
12v, 5v, 5v, 5v, 0,3v, 3,9v
i have 3V3_S5 (L7710) in one imac (one led) but no 5v on L7750
NO SHORT ON L7750
i have not 3V3_S5 (L7710) in the other (no led)
PLEASE HELP I'M GOING CRAZY!!01-25-2024, 01:46 PM -
by phantomEVO've found in diode mode a super low value on pp3v42_g3h...removing l7095 and l7090, i've injected voltage on the line and found that u5000 become hot (3v 0,0100 amp)
replaced u5000 with a brand new one now i have
PPBUS_G3H=8.18
3V42_G3H=3.42
3V3_S5 3,3
no voltage for PP3V3_SUS (no shorts
on u8020 i have 0v on P3V3SUS_EN no shorts
0v on R1464 no shorts
SMC_ADAPTER_EN, 0v
PM_BATLOW_L, 3,3
PCH_DSWVRMEN, 0v
PM_DSW_PWRGD 0,9v... -
by pixellegolasHi!
I have this laptop and first let's go through what happened
Went totally dead, no reaction
I thought it was the adapter so I bought a new one = nothing happened
Opened up the laptop and adjusted the battery cable = Started working
Worked a couple of days and then went totally dead again
Now nothing works
I have opened the laptop, removed basically all removable components. It does not start without the battery or harddrive or anything disconnected.
Testing with voltmeter I can see 5.3V basically... -
by double_DDHi all,
As the title suggests, how can I be sure that my EC chip is really dead?
I've recently gotten into this hobby of laptop repairs, and have successfully brought back to life a couple with some easy fixes, mostly shorted caps.
Now I'm working on HP Probook 455 G8, that had some "devil" run around on 3V line, burning a bunch of stuff. Luckily I have a dead 455G7 (for spare parts) so I managed to fix it (swapped burned parts) to a point that it will charge (both on barrel jack and usb-c), but it doesn't want to turn on. There is a 3V3 on a keyboard... - Loading...
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