820-02100/02098 LCD Backlight Controller IC UP800..

[PickledOnion]

Re: 820-02100/02098 LCD Backlight Controller IC UP800..

Can you share the exact netname used in the schematic? Unable to locate 3.3v_aon. Did you mean PPVIN_P3V8AON ?



If the power rails for the CD3218 ACE controllers have been met, the ACE controllers will function. They are stand alone devices with embedded microcontrollers. Review each of the power pins on these power delivery controllers.

So it appears that pp3v3_s2 is low on the input of the cd3218s. I have checked everywhere on this line for shorts there is none.

pp3v3_s2 is cycling from 0.5v to 1.9v.

pp3v3_s2 comes from u8100 pmic. I have also checked all the ldos on u8100 there are no shorts or burnt coils. Not sure where to go from here. Was going to try dfu but seems pointless if pp1v8_s2 and awake is also doing same thing(pulsing low)

I basicly need some good known diode readings from same board hence suggested sharing with the OP.

[mon2]

Re: 820-02100/02098 LCD Backlight Controller IC UP800..

For which component do you require the DIODE mode readings ?

PMIC ?

[PickledOnion]

Re: 820-02100/02098 LCD Backlight Controller IC UP800..

For which component do you require the DIODE mode readings ?

PMIC ?

Yes u8100 would probably be a good start.

[PickledOnion]

Re: 820-02100/02098 LCD Backlight Controller IC UP800..

Here is some readings from my non working board.

L8280 pp1v2_s2 0.2130 cycling 0 - 0.5v
l8230 pp1v8_s2sw 0.2860 cycling 0 - 0.7v
l8220 ppvdd_ecpu_sram_awake 0.3666
l8290 pvdd_fixed_s1 0.1698 0v no short
l8200 pvdd_ecpu_awake 0.0795 or 217 ohms tg
l8272 pp0v81_s1_sram 0.1745
l8210 ppvdd_gpu_bmpr_s1 0.2443
l8243 ppvdd2h1_s2sw 0.0489 or 132 ohms tg
l82AO pp0v575_s1_vddq1 0.1120
l8260 ppvdd_amph1_s2sw 0.3944
l8250 ppvdd_avemsr_awakesw 0.1139
c8162 pp3v3_s2 0.3692 cycling 0 - 1.5v
ct150 ppv3v3_aon 0.3604 3.3v stable
c8162 PP1V8_S2SW_CLVR_VDDC1_LDO 0.4759
c8165 PP0V8_S2_CLVR_VDDDIG 0.2241
c8180 pp1v5_aon_vcore_mpmu 0.3540 1.5v stable
r8317 pp1v8_aon 0.4122 1.8v stable
c8168 pp1v2_aon 0.5864 1.2v stable
c8152 pp4v9_vpump_mpmu 0.5671
rd650(pin 2) pp3v8_aon_mpmu 0.3125 slowly cycling 3.79v to 3.81v

l7860 pp0v855_s2sw_vddcio 0.1655
l7850 pvdd_soc_s1 0.0221 or 59 ohms
l7890 ppvdd_amph0_s2sw 0.3878
l7880 pp1v2_awake 0.2012
l7830 pp1v8_s2 0.2228 0.7v cycling
l7820 pp0v95_s2sw_vddcio 0.2942
l7800 pvdd_dcs_s1 0.1026 or 283.5 ohms
l7810 pp0v575_s1_vddq0 0.1098
l7843 ppvdd2h0_s2sw 0.0498 or 135 ohms
l78A0 ppvdd_disp_awakesw 0.0333 or 89.96 ohms
c7712 pp3v8_aon_spmu 0.3125
c7760 PP0V72_S2_VDDLOW 0.2255
c7763 PP1V2_AWAKESW_BLC 0.6493
c7768 PP1V2_AON_SPMU 0.6244
c7767 PP1V8_AON_SPMU 0.3536
c7780 PP1V5_AON_VCORE_SPMU 0.3525
c7752 PP4V9_VPUMP_SPMU 0.5662

[NAZAREPAIR]

Re: 820-02100/02098 LCD Backlight Controller IC UP800..

Hello people. I have a question maybe some of you knows the answer, i have this macbook on my hands this time without backlight, i took a lot of messurments around the screen conector and backlight ic, and it looks to me that this is a ic problem. My question is i saw some guy talking that this chip is married to the cpu or something like that, and that can not be replaced. Is this true? I was thinking about order one of this (RENESAS 209100B1), but now i am worried that it wont work, does anybody here can confirm this? Or anybody here replace already this ic succesfully? Thank you so much!

[Timp74]

To answer my own questions... I finally had the time to look at this machine again now that the boardview is availble. Turns out the machine wasn't powering on because there was crap under the slave PMIC. Took me a while to work out. I noticed that the 1v8_s2 rail was beening pulled up to 2.1v by 3v8_aon, there was 300 ohms between the rails, it should be Kohms. I guess other rails were off too. Anyway I soaked the board in isoproponol for a few hours and ran a flux cleaner under the slave PMIC. The machine now boots and works fine. I don't see any reason the a missing backlight bucks/boost controller IC should stop the boot process. There doesn't seem to much activity on it's I2C bus before AWAKE. The leason learnt is that this macbook won't assert the AWAKE signals unless all the preceding rails are at the correct voltages and drawing the expected current. It seems quite a common place for liquid damaged macbooks to get stuck at once all the obvious things have been fixed.