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TroubleShooting for RB450G
These repair instructions are for NON WARRANTY repairs only!
Please make visual inspection for signs of corrosion
No power, blue LED doesn't shine
Check Schottky diode
D802
Check Zener diode
D803
Check P-channel MOSFET
Q801
Check N-channel Dual MOSFET
Q806
Check resistor R819 resistance.
It should be 10 Ohm
Check PWM controller
U803
Problem
still appears
or mechanical damages before starting.
NOT OK
NOT OK
Check PNP transistor Q802
and Zener diode D804
NOT OK
NOT OK
NOT OK
NOT OK
The board is unrepairable
Change faulty Schottky diode
NOT OK
Change faulty MOSFET
Change faulty MOSFET
Change faulty resistor
Change faulty controller
Change faulty components
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Summary of Contents for MikroTik RB450G
- Page 1 TroubleShooting for RB450G These repair instructions are for NON WARRANTY repairs only! Please make visual inspection for signs of corrosion or mechanical damages before starting. No power, blue LED doesn’t shine NOT OK Check Schottky diode Change faulty Schottky diode...
- Page 2 PoE does not work NOT OK Check diode bridges Change faulty diode bridges D805, D806 NOT OK Check connector Change faulty connector J504 Problem still appears The board is unrepairable RB doesn’t boot, green and blue LED’s is shine NO 2.5V NOT OK Check 2.5V output, Check ferrite beads FB801, FB806...
- Page 3 Ethernet port1 (J504) does not work, drop ping packets NOT OK Check resistors R563-R566 resistance. Change faulty resistors It should be 75 Ohm +/-1% NOT OK Check transformer Change faulty connector TR501 Check voltage drop between diode arrays D507, D508 NOT OK pin#1 and Ground.
- Page 4 Ethernet ports 2(J501), 3(J505), 4(J503), 5(J502) do not work, drops ping packets Check termination resistance between Tx and Rx lines in the each Ethernet connector. Change faulty connectors It should be 150 Ohm +/- 2% Check voltage drop between diode arrays D501-D506, NOT OK D509, D510 pin#1 and Ground.
- Page 5 Reference Part Number Manufacturer Description number IC TVS ARRAY LOW-CAP D501-D510 AOZ8000CIL Alpha & Omega SOT23-6 Won-Top Electronics Co., Diode Schottky 60V 3A D802 SX36-T3-LF Ltd. Won-Top Electronics Co., Diode Zener BZX84C 10V 5% D803 BZX84C10-T1-LF Ltd. 225mW SOT23 Z-DIODE 0.41W 27V 2% D804 BZX84B27-AU T/R 7"...
- Page 6 RB450G Reference picture...
- Page 7 RB450G Reference picture...
- Page 8 RB450G Reference picture...
- Page 9 RB450G Output Voltage picture...
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