cq 40 power on but white display issue

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skbasir
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cq 40 power on but white display issue

Post by skbasir »

cq 40 power on white display issue

board lal50-la4101p

dignosis

checked in external display ok but internal white display coming

checked with new lcd with cable but same issue

then checked in lvds conector

found 18v ok

but lcdvdd not present pin 7,9,11

which is coming from q7 transitor of pin 1

q7 pin 3 have 3.3vs and pin1 have no volage which is called lcdvdd voltage

lcdvdd voltage is missing

resulation

chane the q7 transitor and checked display working fine
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replace the q7 and marking it
replace the q7 and marking it
board model no
board model no
q7 in schematics
q7 in schematics
shlnarang
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Joined: Sat Oct 01, 2016 12:09 pm

Re: cq 40 power on but white display issue

Post by shlnarang »

i had a same problem solved it in same way
manikodai
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Joined: Mon Oct 03, 2016 2:55 pm

Re: cq 40 power on but white display issue

Post by manikodai »

Yes same way

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gaurav
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Re: cq 40 power on but white display issue

Post by gaurav »

Nice job

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servis jaya
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Re: cq 40 power on but white display issue

Post by servis jaya »

skbasir wrote:cq 40 power on white display issue

board lal50-la4101p

dignosis

checked in external display ok but internal white display coming

checked with new lcd with cable but same issue

then checked in lvds conector

found 18v ok

but lcdvdd not present pin 7,9,11

which is coming from q7 transitor of pin 1

q7 pin 3 have 3.3vs and pin1 have no volage which is called lcdvdd voltage

lcdvdd voltage is missing

resulation

chane the q7 transitor and checked display working fine
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Goog Info...Thanks Master..
vishalhegade
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Joined: Mon Jun 04, 2018 7:32 am

Re: cq 40 power on but white display issue

Post by vishalhegade »

Samsung r507 laptop white screen problem
vishalhegade
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Posts: 25
Joined: Mon Jun 04, 2018 7:32 am

Re: cq 40 power on but white display issue

Post by vishalhegade »

Samsung r507 laptop white screen problem
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