Screen not powering up(immediately)
The screen does not power up after plugin it in. The led flickers and there is a chirping sound. After some time it turns on.
I concluded it might be an broken capacitor. I found a broken one on the board and replaced it.
The other capacitors seemed to be ok(checked using Multimeter measured capacity). The replacing of the broken capacitor did not fix the issue.
Afterwards I started checking the voltage regulators. I measured the voltages after plugging in the power supply until the board switched on.
There are three Voltage regulators on the board:
- Power supply: 19.5V
- MP1484: 5V
- G1084(LT1084 replica?): 3.3V
- 912T45: 1.2V
The 5V regulator provides only ~4.5V after connecting the power supply. The voltage jumps a little in intervals and after some time it provides steady 5V. Before that the 3.3V regulator cant provide its voltage as well.
I think next step should be replacing the 5V regulator or are there any other suggestions?
Is this a good question?