MikroTik RB450G

TroubleShooting for RB450G
No power, blue LED doesn’t shine
Change faulty MOSFET
Check P-channel MOSFET
Q801
Check Zener diode
D803
NOT OK
OK OK
The board is unrepairable
Problem
still appears
Check Schottky diode
D802
Change faulty Schottky diode
NOT OK
OK
Check resistor R819 resistance.
It should be 10 Ohm
Change faulty resistor
NOT OK
Change faulty components
NOT OK
Check PWM controller
U803
Change faulty controller
NOT OK
These repair instructions are for NON WARRANTY repairs only!
Please make visual inspection for signs of corrosion
or mechanical damages before starting.
Check PNP transistor Q802
and Zener diode D804
NOT OK
Change faulty MOSFET
Check N-channel Dual MOSFET
Q806
NOT OK
OKOK

MikroTik RB450G Specifications

General

Wi-Fi band	-
Storage media	Flash
Internal memory	256 MB
Storage capacity	512 MB
Voltage monitoring	Yes
License level	5
Processor cores	1
Processor model	AR7161
Processor frequency	680 MHz
Compatible memory cards	MicroSD (TransFlash)
Basic switching RJ-45 Ethernet ports type	Gigabit Ethernet (10/100/1000)
Power over Ethernet (PoE) voltage range	8 - 30 V
Power connector	DC-in-jack
DC input voltage	8 - 28 V

Weight and Dimensions

Depth	115 mm
Width	90 mm
Weight	105 g

Summary

Trouble Shooting for RB450 G

No power, blue LED doesnt shine

Troubleshooting steps for a device that does not power on or show a blue LED.

PoE does not work

Steps to diagnose and resolve issues with Power over Ethernet functionality.

RB doesnt boot, green and blue LEDs is shine

Guide for troubleshooting boot failures and LED status issues.

Ethernet port1 (J504) does not work, drop ping packets

Steps for diagnosing and fixing issues with the primary Ethernet port.

Ethernet ports 2(J501), 3(J505), 4(J503), 5(J502) do not work, drops ping packets

Troubleshooting guide for multiple Ethernet port connectivity problems.