820-2936-B No backlight

[dukefawks]

So if you plug in the cable there is a short. Inspect the cable and connector for damage. I suspect a bad cable.

 

[Triple6r]

I changed cable i got on c9015 4.206 k ohms and on 8.38 k ohms on L9004 both measured across

 

[Triple6r]

Soo i was taking of L9004 and one of the pads totaly gone burnd of stuck under l9004 so iam thinking that i need to run a wire to fix this i have order wire its coming next week

i took off l9004 and put on new other one but nothing olso the screen is totaly black now so i think i have to wait for the wire

 

[dukefawks]

Without L9004 there should be a white screen with backlight. So if there is nothing now the screen is not recognized. Either bad cable or something got damaged. C9010 3V present? Check if cable properly plugged in and try with the old cable to see if backlight comes back.

 

[Triple6r]

I got on c9010 pin 2 3v i got on pin 1 nothing (goes to gnd)

 

[dukefawks]

No idea, should at least have backlight/image. Test with the old cable and see if anything changes. Or did you blow the fuse again?

 

[Triple6r]

Hi i checkt the cable and cable is bad 1 pin was twisted so i have order new cables i have to wait for that all my other cables ar olso bad ... but i have still nothing on c9015 no volt
and i have still repair L9004 the path under it is gone ??

 

[dukefawks]

Wait for a good cable and try again. First need backlight back again. Then also check if 3V gets to C9011.

 

[Triple6r]

hi so i got new cables and no backlight no screen and also nothing on c9011? F9700 12.53

 

[larossmann]

Use a known good display assembly.

 

[Triple6r]

hi i try the screen on a 820-3115-b and it works on that board

 

[dukefawks]

First check pins 1-7 of they have continuity to the LCD to ensure connector/cable are good. Then check if LCD_IG_PWR_EN comes high with the screen connected.

 

[Triple6r]

pin 1 0 pin 2 0 pin 3 0 pin 4 3,307 pin 5 1.5 pin 6 3,3 pin 7 3,3

 

[Triple6r]

and lcd_ig_power_en r9014pin 1 0 pin 2 nothing u9000 pin 1 0

 

[dukefawks]

I have no idea what you are doing. I just asked if there was continuity from pins 1-7 on the LCD connector to the end of a separate cable.

You can also measure diode mode on pins 1-7 on the end of the LCD cable.

 

[Triple6r]

i did diode mode now and got a lot of different measurements

 

[Triple6r]

It was jumping from 100-30-221 on the end 2.2 m ohms

 

[dukefawks]

I can't help you if you do not know how to use a multimeter. I hope you are not measuring this when powered on at least.