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Hi all, I have a 820-3115 that I have replaced the lcd connector on and now I get no image but I have backlight. I tried another connector but same symptoms, any ideas? Thanks

Not to worry Duke - this one had so many issues it wasn’t worth it. Sent it back!

Update - i think this may be a no video issue. I am missing PP3V3_LCDVDD_SW but on U9000 i have voltage in but not out. pin 1 LCD_IG_PWR_EN = 0 volts

Hi all, I have a 820-3115 that has 0 volts on PPVOUT_SW_LCDBKLT . I have 5 volts into U9701 (i have replaced this but no change) I also have pubs voltage at Q9706 but 0 volts coming out. On pin 3 of Q9706 for LCDBKLT_EN_DIV i have 12.20v. Any ideas what's going on? Thanks

Okay thanks Duke - I’ll leave it at that and close this??

Resistance to ground on PPBUS is 400k approx System side and 600k the other. ISL looks good and R7005 measures and looks okay too. Confused.com?

Current sensing seems fine too - Pins 27/28 are 20.3 ohms and 17/18 are 3 ohms (might be a bit high?)

Okay so replaced all of those and i have 16v coming in and green light - but drawing 0 amps and PPBUS_G3H is only 0.1v Any idea what to do next? it seems ISL is not creating the 12v but it's been replaced twice now

Thanks Duke - will get to it tomorrow??

Hi all, I have an 820-3115 that is completely dead. This is the history so far: - No green light and 9 volts on pubs_g3h - Replaced ISL6259 because it looked like it had a hole in it - Green light restored - Powered up normally. I then plugged it back into the power supply and Q7085...

Working fine after an ultrasonic and pre heat!! :)

UPDATE: Might have been a bit quick to post - looks like someone replaced the SMC but it looked awful - reflow seems to have it powered on and working. A lovely bath needed I think!

Hi there, I've just had a board in thats had a lot of work done to it :-( So symptoms are: Fan spins for about 5 seconds when connected to power then stops. Then it starts again and stays on - fan goes high. I have gone through all the power rails - all present including vcore at 1.8v. Does...

Might be worth checking R7151 and R7152 - current sensing for the battery. Also pins 17/18 on ISL may give you some hints

Awesome thanks!

Is there any way to tell for sure that it’s the connector - visually it looks great and I’m sure all of the voltages are present. I guess Pin 1 BCK light output being 50v can justify the connector replacement but just want to double check?

Okay thanks - will get to that shortly

Hi John, with the original screen i get 0 volts on backlight output so i swapped to a KG screen and i can see the question mark folder with a light. I tried another screen to be sure and same thing... confused!

there was also a small amount fo liquid near C5801 which i notice has a prob point under for EDP_BKLT_PWM but it's present on pin 8 of the LCD connector at 1.5v the other liquid damage was only on the SSD but i wonder if this could affect anything with backlight?

Hi there, I have a 820-4924 with no backlight. I have 50 volts on PPVOUT_S0_LCDBKLT i've tested pretty much all of the backlight circuit and it seems fine. U7700 seems to have everything too. any ideas where to go next? thanks