Recent content by EcWeb.L.

all right , thx for the support . I'll comunicate it to the customer.

removed RD810 , still the same .

dead board not worth the time investment?

Removed CC719 , back to cycling immediately, peaked at 0.190mA then restart. Checked CC720 -P3v3S2_VOS is 0.298 and it should be 0.442 Checked RC712 -P3v3S2_FB_R is 1.824 , it should be OL

last update : I've checked the other IC's . All good. I've put back everything on the board ( also LC710) and the voltage mantained on 20v for about a minute . I've noticed that i have a good 3.36v on PP3v3s2. After this one time the machine went back to cycling voltage. Could this give any...

I am sorry but ,with the little knowledge i have, i'm not sure if i understand correctly . The damage could be in the trace itself or the cpu , i'm left with little to do about it . Right?

Changing uc710 wouldn't make a difference ? Any way to go further with the diagnosis or i should consider this a dead board?

The third photo in the first post i've made is this area. I've now cleaned the area with alcool but there were some traces of dry wine and a mild corrosion on uc710 , pin 7-6-5-4 ( a bit of green can also e seen from the photo)

It's mantaining 20v for about 20 seconds , amps back and forth up to 650mA . Then back to 5v and it tries again. Seems like the boot sequence starts. Am i right?

Took out LC710 : PP3V3_S2 0.269 PP3V3S2_SW 0.551

I took the reading on the side opposite to uc710 , to be sure i've checked again and it shows on both sides. I'don't know if it makes a difference but it starts from 0.325 and rapidly goes to 0.290/0.287.

These are the readings . U8100 area -L8100 PPVDD_PCPU_AWAKE 0.032 OK -L8110 PPVD_GPU_AWAKE 0.063 OK -L8120 PPVDD_SOC_S1 0.049 OK -L8230 PP1V8_s2 0.330 OK -L84E0 PP1V4_LDO_PREREG 0.286 OK -L8290 PPVDD_DCS_S1 0.270 OK -L8280 PPVDD_DISP_S1 0.202 OK -L8271 PPVDD_CPU_SRAM_AWAKE 0.241 OK -L82B1...

These are the coils i've tested . L5230 -CHRG_PHASE1 0.499 OK L5800-L5820-L5840 -PP3v8AON_VSw1 0.364 OK -PP3v8AON_SW2 0.364 OK -PP3v8AON_SW3 0.366 OK LC320 -P5v_s2 0.312 OK LC710 -P3v3_s3 0.287 (this one was suposed to be 0.423 according to the reference table) OUTPUTS from...

Thanks! Applying leaded solder worked. I can confirm all resistors are good , PPBUS_AON and 3V8_AON are still fluctuating in the same rythm as the voltmeter.

Yes , PPBUS_AON and 3V8_AON fluctuate in the same rythm. Two readings was to compare "My Value" / "schematics value" , my bad if it was misleading. Do you have any tip on how to desolder these resistors from the board ? I've done a few ICs in the past but i can't get these little resistors...