Test & Debug Flow - Zenith DVB413 Service Manual

3. Test & debug flow
Test
Check the AC Voltage
(110V or 220V)
Yes
Switch on the Power PCBA
Is
the DC Voltage
Outputs OK? (5.2V,5V,1.8V
,3.3V,8V,12V)
yes
Is
3.3V, 1.8V,5V,12V and 8V
outputs normal on main
PCB
yes
Connect to PC RS232 Cable and
Update the flash memory code
Update
Flash(IC502)
Successfully?
Yes
A
No
Check the Power PART
No
Check the Power PART
No
Check the IC105 or diode
1.Check 27MHz system clock.
2.Check system reset circuit.
No
3.Check flash R/W enable signal PRD
4.Check RS232 Signals
5.Check flash memory related circuit
Replace flash(IC502)
3-4