Hello. Have this lenovo g555 with ATI igp. problem is that it display only on external. i replace aTI IGP with new working one but nothing changed.
lid sw have power. it is UMA version
lid sw have power. it is UMA version
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Re: Lenovo G555, only external display working
check lcd cable or ur screen -
Re: Lenovo G555, only external display working
cable checked, lcd changedComment
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Re: Lenovo G555, only external display working
Check the connector from the cable.The Night Drop Down, I Will Keep Try Until..., You Never know.
Dushi Kòrsou, Nos Tei.Comment
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Re: Lenovo G555, only external display working
please post here if you have the schematic.sigpicComment
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Re: Lenovo G555, only external display working
here is schematicLast edited by ktmmotocross; 06-28-2015, 12:52 AM.Comment
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Re: Lenovo G555, only external display working
Please post voltages on lvds connector.Comment
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Re: Lenovo G555, only external display working
here is measurements of lvds connectorAttached FilesComment
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Re: Lenovo G555, only external display working
You seem to have a problem with KBC. Try to inject 3.3v on the dac_brig pin.Comment
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Re: Lenovo G555, only external display working
i just replaced kbc but nothing changed. try to inject. what is dac_brig signal for?Comment
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Re: Lenovo G555, only external display working
inject 3.3V but no changeComment
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Re: Lenovo G555, only external display working
brightness. Probably no enbkl signal.Comment
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Re: Lenovo G555, only external display working
Measure the signals on the screens lvds connectorComment
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Re: Lenovo G555, only external display working
rightness is regulated from UMA_PWM. ENBL signal is for VGAComment
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Re: Lenovo G555, only external display working
I just noticed that you have an 15.6 ccfl screen (although schematic mentions led)
From an inverter datasheet:
"
There are two control signals that come form syst
em to control lamp brightness. One signal is
named DAC_BRIG, which limits curr
ent to meet LCD lamp current specification. Another one is
named PWM, which adjusts lamp br
ightness. This invert
er brightness is adjusted by PWM burst
mode. The PWM burst mode is that turning on and
off the lamp at rate of 150Hz. The effective
brightness is a function of the duty cycle.
"
ENBKL signal is raised from Northbridge and goes to KBCComment
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Re: Lenovo G555, only external display working
but i dont have problem with backlight. i have problem with no lcd daa. i can turn on backlight but still no data or bad dataComment
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Re: Lenovo G555, only external display working
flashed bios, no change
for me it looks like bad clock signal or something like that. the image is distorted but i see that is something displaying but its linesComment
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Re: Lenovo G555, only external display working
You have to remove Northbridge and check lines to lvds connectorComment
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Re: Lenovo G555, only external display working
Ilast time i have sb off the board i checked these connections and it was al good.
What is lcd clock frequency? Now dont have scope to chrck it.Comment
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Re: Lenovo G555, only external display working
What is SB has to do with GMCH_TX*** lines?Comment
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Dear Friends., I am working on a Lenovo YOGA 910-13IKB. It is working fine, no problems at all. Today I was connecting to a External Display through the USB-C HUB, it could not connect. (This Lenovo model has only 2 USB-C Port, no HDMI, so has to be connected through a External USB-C HUB). I have changed the setting to External display but still no luck. Re-loaded Windows 11, assuming that the software might be faulty & still same. I know my USB-C port HUB is 100% good (HDMI, USBs, SD Reader) as I use this on all MacBooks & even my buddy has another HUB, still cannot connect to External...08-16-2023, 07:58 PM -
Hello guys! I need a little help, I have one laptop for repair, it is an Aorus 17G YD, gaming laptop. Broken display, some cable ripped form daughter board connector, case broken, battery discharged and probably locked, etc. After I did the most tedious job I ever did on soldering back the broken cables (shielded cable) , I measured resistance on CPU and GPU core, 3 and 5 v ps and any coils I find on the board, everything seems to be fine. After I plugged the charger I don't get the power led light on from the charger connection maybe because the battery is locked , but on power button I have... -
Hi Guys,
LENOVO IDEAPAD FLEX 5 - 14ITL05
BIOS VERSION - FXCN24WW
EC VERSION - FXEC18WW
MTM - 82HT0004US
SERIAL NUMBER - R9130MDP
CPU - i7-1165G7
This laptop powers on but shows nothing on the internal display.
However, if I attach an external display it works fine.
Observations: When I shut down the laptop from windows,
the fan remains spinning until I close the lid. If I leave the lid open
the laptop will restart on it's own although I select shut down from windows.
Also, when I check the voltage on the... -
Here is a pretty crazy one.
Step 1.
Laptop was brought to me as dead not working. Removed everything , cleared everything.
Step 2.
Some liquid damage close to the Type - C connector, and the connector even though it was cleaned wasn't charging the battery . Removed the Type-C port, and replaced it. Now the laptop turns on and charges battery. Shows external screen , not internal.
Step 3.
Took out the screen and checked it to a secondary Gen 2 i have, screen works like a charm.
Step 4.
Lets ,dive into the board. I see the edp cable on the... -
Computer in question : Razer Blade 15 2020 Base Model
Model# RZ09-03286E22
BIOS CHIP: WINBOND W25Q128BV
What I'm trying to accomplish:
I want the computer to properly boot with an external display with the attached display disconnected from the motherboard. I have a CH341A programmer and full capability of modifying the BIOS easily. I Have tried various setting changes to no Avail.
What I've tried thus far: Too much to note and I really dont remember everything I changed but here it goes.
W/Stock BIOS - 1.06:
Disconnect the...
Comment