Update from my side:This afternoon I have finished my analysis from all SOT23 elements. All seem to be fine.
However last time I was playing with it I massively f&ckedup and created a shortage on U20. This now results in having a short between L1 and ground
Initially the unit did not work and I broke L1 coil, burned 2 capacitors and removed the super-cap. Also removed burned C27 and C36 (hot air destroyed them)
The issue with my unit is, that when I turn it on, I see a green led for lets say 2 seconds, no screen and no power (unit is really off). Therefore I have checked all SOT23 elements.
I have looked-up up almost all data-sheets to see which IC's are used and next is to figure out why some voltage lines are not comparable with a post earlier in this threat.
Luckily I recently purchased a toneohm 850. 1 problem, I never ever used such a device, so I need to figure out how to trace to the broken component.
I already removed CR9, C79 and C67 (randomly -> goose-chase). But I need to do this more structured -> Toneohm.
I have some questions for here on the board already:
1. What are these components (ideally with link to a data-sheet):Q12, Q13 -> Code 337 -> FDN337N -> N-Channel Enhanced Mosfet + body diode -> Cannot find any data-sheet
Q20, Q21, Q43 -> Code 338 -> NDS338N -> P-Channel Enhanced Mosfet + body diode -> Cannot find any data-sheet
U11 -> Code S08H -> No Idea (AND port?
)
2. What is the difference between VR05 and U04 (why is one name with a "U" and the other "VR"):VR05 ->Code 8H -> MMBZ5233BLT1G -> Zener Voltage Regulators 225 mW SOT−23 Surface Mount
U04 -> Code R1E -> LM4041 -> LM4041-N-xx Precision Micropower Shunt Voltage Reference
3. Is this part a correct replacement for the white capacitors (high precision) -> C27 and C36Code 223 KZS -> Kemet SMC F125PP223J100
(Original part is in PL housing, but that seems not for sale, however size is then upgraded to PP, SMC series, 223 matches. However KZ is still unknown in code name) -> Any help would be highly appreciated!
@Nixxon:If your unit is not doing anything anymore, check if U17 is actually giving juice (even when powered off.
U17 = Code PCYI -> TPS770 -> Power 5V ULTRALOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
Tomorrow I will try to find my shortage with my toneohm and once fixed I will dig into this unit a little further.