LG MDT505 - Power and Voltage Verification

3-10
Check the POWER PART.
NO
NO
YES
Check the
AC voltage Power PCBA (110 V
or 220 V).
NO
NO
NO
YES
YES
YES
YES
YES
A
Are the
DC Voltage outputs OK? (from the SMPS).
TEST.
Are 3.7, 5.6, 12 and
28 V(36V) DC outputs normal on
Main PCBA?
Switch on the Power PCBA.
Update
FLASH successfully?
Check the POWER PART.
Check the regulators or diode.
1. Check 27 MHz system clock.
2. Check system reset circuit.
3. Check FLASH R/W enable signal PRD,
RWR.
4. Check FLASH Memory related circuit.
Replace FLASH.
6. TEST & DEBUG FLOW