MikroTik RBSXTG-5HPnD Series Setup guide

Repair instruction
RBSXTG-5HPnD
Published June 8, 2015

These repair instructions are for NON WARRANTY repairs only!
Please make visual inspection for signs of corrosion
or mechanical damages before starting
Contents
List of RBSXTG-5HPnD series............................................................................................3
Disassembling information.................................................................................................4
Routerboar oes not power on........................................................................................6
Routerboar oes not boot...............................................................................................10
Ethernet port oes not work.............................................................................................12
Voltage an temperatur monitor oes not work.............................................................13
USB oes not work............................................................................................................14
WiFi oes not work............................................................................................................16
2 Latest Checking procedure for over-voltage da age available at www. ikrotik.co

List of Clou Router Switch SXT 5 series
SXT HG5
SXT SA5
List of Cloud Router Switch SXT 5 series 3

Disassembling information
1. Use two “-” screwdrivers. Push screwdrivers in case cavities.
2. Rotate screwdriver and pull both case parts.
4 Disasse bling infor ation

3. Remove rubber bushing
4. Push back Plastic PCB holders and take out the board.
5

Routerboar oes not power on
There no signs of any LE , LC or buzzer activity
Find potential problem area
RouterBOARD does not turn on when one o the power is disconnected. Check Which voltage is
switched o , Power IN (10 – 28V), 3.3V or 5V.
6 Routerboard does not power on
GND
Power IN
5V
3.3V

If Power_IN Failed
1. No power on 10-28V input
Routerboard does not power on 7
Check for 10-28V output
on C27
Try to use different
PSU adapter
Problem solved Measure if there is no short
between GN and C27 “+” pin
Change C27, C428
Measure Voltage
on Q1 pin 1-3
Change Q1 Check if ferrite bead FB1 is OK
Change FB1
Measure Voltage drop
over 3 and 4
Check Voltage on 404
and 405 at TRF401 side
Change 3 and 4
Change Q2
Change 404
and 405
Change TRF401
OK Not OK
Short
No short
0V10-28V
OK Not OK
0.7V> 0.7V
0V10-28V

2. No Voltage on 3.3V output
3. No Voltage on 5V output
8 Routerboard does not power on
Check for 3.3V output
on L1
Measure if there is no
short between GN and L1
Change C8Measure L1 resistance
Measure resistance on R2
(26.1k Ohms) and R3 (10k Ohms)
Change L1
Change U1 Change R2, R3
ShortNo short
>1 Ohm<1 Ohm
Not OK
OK
Check for 5.0V output
on L2
Measure if there is no
short between GN and L2
Change C42Measure L2 resistance
Measure resistance on R6
(44.2k Ohms) and R8 (10k Ohms)
Change L2
Change U1 Change R6, R8
ShortNo short
>1 Ohm<1 Ohm
Not OK
OK

4. Supply voltage components location on RouterBOAR
5. Supply voltage Components table
Routerboard does not power on 9
Q2
Q1
D3
D4
D428
C27
D404;
D405
TRF401
L1 C8
R2
C27
U1
L2
C42
R6
R8
U2
Reference Manufacturer co e Description Manufacturer
C27 MG035M331G13PKKKS00R Capacitor elec 330uF 20% 35V 10x13 TH P=5 6000h 1.36A 0.043Ohm MG-series KUAN KUN ELECTRONIC ENTERPRISE CO., LT . (Su-scon)
C8, C42 UCW0J471MNL1GS Capacitor elec 470uF 20% 6.3V 8x10 SM 7000h 600mA CW-series NICHICON CORPORATION
3 BZX84C10-T1-LF iode Zener BZX84C 10V 5% 225mW SOT23 iodes Zetex Limited
4 BZX84B30-AU_R1_000A1 iode Zener BZX84B 30V 2% 400mW SOT23 PanJit International Inc.
404, 405 SR210-T3-LF iode Schottky 100V 2A SMA Won-Top Electronics Co., Ltd.
L1, L2 BCRH8 43-100N-NL Inductor 10uH 30% 3.6A 8.3x8.3x4.7 34mOhm RoHS T&R Bao Cheng Electronics Co.,Ltd.,
Q1 AO4441 Transistor MOSFET P-Ch -60V -4A 100mOhm 3W SO-8 Alpha & Omega
Q2 BC856B,215 Transistor PNP -65V -100mA 250mW Hfe=220-470 SOT-23 RoHS NXP Semiconductors
R2 RC0402FR-0726K1L Resistor 26.1k 1% 0402 Yageo Corporation
R3, R8 RC0402FR-0710KL Resistor 10k 1% 0402 Yageo Corporation
R6 RC0402FR-0744K2L Resistor 44.2k 1% 0402 Yageo Corporation
TRF401 NS602462 10/100/1000 Single Ethernet transformer SM 24pin RoHS T&R Feei Cherng Enterprise CO., LT .
U1, U2 LSP5526-S8A C- C Step-down converter 4.5-30V input 2A output Sync SO8, RoHS Lite-On Semiconductor corporation

Routerboar oes not boot
If Netinstall can see the boar , but can not install it
1. Troubleshooting flow chart
10 Routerboard does not boot
Measure inductor L103 resistance
Change defective
L103
Check 1.8V output on
transistor Q200 pin2
Change Q200
Measure ferrite bead
FB200 resistance
Change FB200
Change NAN
flash U300
Change 25MHz Crystal Y700
Change resistors R303, R305,
R306, R307, R308, R310, R311, R312
Change RAM U200
Change CPU U100
<1
Ohm
>1
Ohm
<1
Ohm
>1
Ohm
1.8V 0V
Problem still
appears
Problem still
appears
Problem still
appears
Problem still
appears
On U100 CPU silcscreen must be the same product code,
or You will lose the license. License may also lose if changes U901