Sony BRAVIA XBR-55X900H User manual

SERVICEMANUAL(COMMON)
GN6VH CHASSIS
Segment: NX / NXB / NX2
9-888-784-03
LCD TV
Sony EMCS (M) Sdn. Bhd., HES-M
© 2021.05
ORIGINAL MANUAL ISSUE DATE: 2020.03
Conditions of Use:
(1) Please use this information only for the purpose of performing repair, maintenance and/or configuration services of the Sony products
(hereinafter the “Repair services”) under the service agreement entered into with the Sony group company (hereinafter the “Service
agreement”). Using this information for any purpose other than the purpose described foregoing is forbidden.
(2) Only the Authorized Servicer’s officers, employees or subcontractors (including their officers and employees) whose duties justify a need-to-
know and who have agreed to hold confidential this information (collectively hereinafter the ”Permitted users”) are permitted to access and
use this information. To disclose or disseminate to any person other than the Permitted users is forbidden.
(3) Destroy or erase any and all portion of this information promptly in an irrecoverable and secure fashion after achieving the purpose
described in Section (1) above.
(4) Do not copy, replicate, reproduce, alter, translate, transmit, sell, lease, or distribute this information in whole or in part without the prior
written permission of the author.
(Notwithstanding foregoing, it is permitted to copy and distribute this information to the Permitted users.)
(5) Please notify immediately any leakage, loss, theft, misappropriation, or other misuse of this information by e-mail to the following address:
somk-gcs-tissnex[email protected]y.com
(6) In addition to the above, the terms and conditions of the Service agreement shall be applied to using this information.
Revision of Information:
This information may be changed or updated at any time without any prior notice. Please confirm that this information is up-to-date before
using it.
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Version
Date
Su
bject
1
2020.03
1
st Issue
2
2020.06
Add software update info ( pg. 95)
3
2021.05
Add new model NX2 (pg. 3, 16, 87)
REVISION HISTORY
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THIS SERVICE MANUAL CONTAINS COMMON INFORMATION FOR BELOW REGIONS AND MODELS:
REGION
AMERICA
CHINA ASIA
MODEL LISTS
MODEL
XBR-55X900H
XBR
-65X900H
XBR
-75X900H
XBR
-85X900H
KD-55X9000H
KD
-65X9000H
KD
-75X9000H
KD
-85X9000H
KD-55XH9005
KM
-65X9000H
KD
-75XH9005
KM
-85X9000H
KM-55X9000H
KD
-65XH9005
KM
-75X9000H
KD
-85XH9096
FW-55BZ40H
FW
-65BZ40H
FW
-75BZ40H
FW
-85BZ40H
ADD FY21 MODELS (NX2)
KD-85X91J
KD-85X91CJ
REGION
AMERICA
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Note: Pictures provided in this manual may have difference from actual sets
Please refer Service Manual –Unique for below
information :
▪Disassembly and Removal Caution
▪Wire Dressing
▪Circuit Board Location
▪Exploded Views and Part Lists
Title
Page
SECTION
1 : SAFETY NOTES 5
SECTION
2 : SELF DIAGNOSTIC FUNCTION 11
SECTION
3 : TROUBLE SHOOTING 15
SECTION
4 : SERVICE ADJUSMENT 74
SECTION
5 : DIAGRAMS 86
SECTION
6 : PANEL HANDLING 92
TABLE OF CONTENTS
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1-1. Warningsand Caution
1)CAUTION :These servicing instructions are for use by qualified service personnel
only.
2)To reduce the risk of electric shock, do notperformany servicing other than that contained
in the operatinginstructions unless you are qualified to do so.
3)WARNING!! : An isolation transformer should be used duringany service to avoid
possible shock hazard, because of live chassis. The chassis of this receiver is directly
connected to the ac power line.
The replaceable fuse could be in the neutral of the mains supply. When replacing the fuse,
the mains shall be disconnected forde-energize the phase conductors.
(*Except AC ADAPTOR, Because it doesnot carry out replacing an internal fuse.)
4) CARRYING THE TV : Be sure to follow these guidelines to protect your propertyand
avoid causing serious injury :
•Carry the TV with an adequate numberof people; larger size TVs require two or more
people.
•Correct hand placement while carrying the TV is very importantfor safety and to
avoiddamages.
5) SAFETY-RELATED COMPONENT WARNING!! : Components identified by shading and
! mark on the exploded views, and in the parts list are critical for safe operation. Replace
these components with Sony parts whose part numbers appear as shown in this manual
or in supplements published by Sony. Circuit adjustments that are critical for safe
operation are identified in this manual. Follow these procedures whenever critical
components are replaced or improperoperation is suspected.
6) IMPORTANT REMINDER FOR TV MAINBOARD REPLACEMENT :
It is mandatory for service centers to confirm the TV‘s system information after each repair
carriedout with Mainboard replacement.
SAFETY N OTE S
Whenever a TV Main board is replaced, the correct TV ModelandSerial number must be
reinserted into memory.
This is a MANDATORY procedurethateach service center mustapply.
Please refer to the chapter of ADJUSTMENT in this service manual to findouthow to set the
modelnumberand serialnumber in service mode.
1-2. Caution Handling of LCD Panel
When repairing the LCD Panel, make sure you are grounded with a wrist band.
When repairing the LCD Panel on the wall, the panel must be secured using the 4 mounting
holes on the rear cover.
1) Do not press the panel or frameedge to avoid the risk of electric shock.
2) Do not scratch or press on the panel with any sharp objects.
3) Do not leave the module in high temperature or in areas of high humidity for an extended
period of time.
4) Do not expose the LCDpanel to direct sunlight.
5) Avoid contact with water. It may cause short circuit within the module.
6) Disconnect the AC power when replacing the backlight (CCFL) or inverter circuit. (High
voltage occurs at the inverter circuit at 650Vrms)
7) Always clean the LCDpanel with a softcloth material.
8) Use care when handling the wires or connectors of the inverter circuit. Damaging the
wires may cause a short circuit.
9) Protectthe panel fromESD to avoid damaging the electronic circuit (C-MOS).
SAFETY NOTES SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE 5
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10) During the repair, DO NOT leave the Power On or Burn-in period for more than
1hour while the TV is face down on a cloth. Refer Figure 1
Figure 1.
SAFETY N OTE S
1-3. Caution for board handling
Symptom : The following problems will occur due to handling of the IC mounted on the
board
・Solder crack due to substrate handling (stress)
・IC breakdown due to static electricity (ESD)
When repairing the TV at the customer‘s home or service station or Repair of defect board,
please pay attention to the handling of the board
※Substrate that needs attention for handling
・Main Board（B** - Board）
・Backend Board（D** - Board）
ESD wrist-strap
ESD wrist-strap to be checked daily.
Use Multi-meter to make sure resistance of ESD wrist-strap is OK.
(R=750K Ohms to 35Mega Ohms)
ESD cushion/sheet
Please use a bag containing the board or a special seat
※Things to prepare in advance
SAFETY NOTES SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE 6
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1) Caution for Board handling(Stress)
Be sure to observe the following contents.
③Handle with care. Do not swing.
①Hold the board with both hands
②Do not hold/push Heat-Sink
SAFETY N OTE S
④Regardless of Good board or Defective board, always put it
on ESD cushion/sheet slowly.
⑤Do not stack up
⑥Keep vertical position and put in/take out from Box.
Always put in to ESD bag then place into Box/Container Box.
SAFETY NOTES SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE 7
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⑦Do not hold Heat-Sink when take out or install it..
2) Caution for Board handling(ESD) Be sure to observe the following contents.
①When take off Rear-
Cover,
do not touch to board ②Use ESD wrist-strap
SAFETY N OTE S
※Installation example of wrist-strap
Please connect the clip to the metal part of the chassis of the TV
with the wristband grounded. Below is a grounding example of
each model.
＜K*-55/65A9F＞
＜K*-65Z9F＞
※Caution
ESD wrist-strap to be checked daily.
Use Multi-meter to make sure resistance of ESD wrist-strap is
OK.(R=750K Ohms to 35Mega Ohms)
SAFETY NOTES SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE 8
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9
③When holding board, do not hit/touch to Plastic part(s)
④After take defective board out from TV, put it into ESD bag.
Do not place on floor mat/carpet direct. And, always put it on
ESD cushion
SAFETY N OTE S
1-4. Caution About the Lithium Battery
1) Dangerof explosion if batteryis incorrectly replaced. Replace only with the same or
equivalent type.
2) Outer case brokenbatteryshouldnot contact to water.
1-5. Safety Check-Out
Aftercorrecting the original service problem, performthe following safetychecks
beforereleasing the set to the customer:-
1)Check the area of your repair for unsoldered or poorly soldered connections. Check the
entire board surface for solder splashes and bridges.
2)Check the inter board wiring to ensure that no wires are pinched or contact high-
wattage resistors.
3)Check all control knobs, shields, covers, ground strapsand mounting hardware have
been replaced. Be absolutely certain you have replaced all the insulators.
4) Look for unauthorized replacement parts, particularly transistors that
were installed during a previous repair. Point them out to the customer and recommend their
replacement.
5) Look for parts which, though functioning show obvious signs of deterioration. Point them
out to the customer and recommend their replacement.
6) Check the line cords for cracks and abrasion. Recommend the replacement of any such
line cord to the customer.
7) Check the antenna terminals, metal trim, metalized knobs, screws and all other exposed
metal parts for AC leakage. Check leakage test as described next.
8. For safety reasons, repairing the Power board and/or Inverter board is prohibited.
SAFETY NOTES SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE 9
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1-6. Leakage Test
(To protect electric shock when customer touch the terminal.)
Leakage current can be measured by V: Voltmeter or oscilloscope (r.m.s. or peak
reading)
Stabilized power supply instrument and isolated voltage transformer:
Use too much current capacity and isolated voltage transformer does not need to use
stabilized power supply equipment.
Specification of RMS volt meter: Input resistance > 1 Mohm, Input capacitance < 200
pF, Frequency range: 15 Hz –1MHz . Refer Figure 2. Isolated type volt -meter (FLUKE
8921A etc *1)
*1 Not use FLUKE 8920A that connected to protective earth by diode
# Leakage current of measurement instrument is less than 10μArms when under test
equipment AC plug is opened
# Set up the following condition and turn on the set. Applied voltage: Nominal input
voltage (Description on Nameplate)
# Measure the leakage current between one phase conductor and neutral for terminal A
and terminal B.
Read rms value, and then calculate to peak value PEAK VALUE =√2 RMS VALUE
Comply with the following requirement
Class II equipment(2-pin plug): for each terminal, the worst value of measurement
must not exceed AC 350uA peak).
Note: including AC adaptor,AC adaptor/DC operated unit combination
Figure 2 –Measuring network
for LeakageCurrent
SAFE TY NOTES
1-8. Lead Free Information
The circuitboards used in these modelshave been processed using Lead
Free Solder. The boards are identified by the LF logo located close to the
board designation.
Figure 4: LF Logo Figure 5: LF logo on circuit board
1-7. Howto Find a GoodEarth Ground
1)A cold-water pipe is a guaranteedearth ground; the cover-plate retaining screw on
most AC outletboxes is also at earth ground.
2)If the retaining screw is to be used as yourearth ground, verify that it is at ground by
measuring the resistance between it and a cold-water pipe with an ohmmeter.The reading
should be zero ohms.
3)If a cold-water pipe is not accessible, connect a 60- to 100-watt trouble- light (not a neon
lamp) between the hot side of the receptacle and the retaining screw. Try both slots, if
necessary, to locate the hot side on the line; the lamp should light at normal brilliance if the
screw is at ground potential(see Figure 3).
Figure 3. Checking for earth
ground.
The servicing of these boards requires special precautions. It is
stronglyrecommendedto use Lead Free Solder material in order to
guaranteeoptimal quality of new solder joints.
SAFETY NOTES SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE 10
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SE LF DIAGN OSTIC FUN CTI ON
The units in this manual contain a self-diagnosticfunction. If an error occurs, the Smart Core Red LED will automaticallybegin to flash. The number of
times the LED flashes translates to a probable source of the problem.
Adefinitionof the Smart Core Red LED flash indicators is listed in the instruction manual for the user’s knowledge and reference.
If an error symptom cannot be reproduced, the remote commander can be used to review the failure occurrence data stored in memory to reveal past
problems and how often these problems occur.
DIAGNOSTICTEST INDICATORS
Whenan error occurs, the Smart Core Red LED will flash aset number of times to indicate the possible cause of the problem. If there is more
than one error, the LED will identifythe first of the problem areas.
Result for all of the followingdiagnostic items are displayed on screen. If the
screen displays a “0”, no error has occurred .
Smart Core RED LED
blinking count NX / NXB / NX2
2x <B/G> Main 12V over voltage [MAIN_POWER]
3x <B/G> Main 5.0V failure [DC_ALERT]
<B/S/G> Audio amp. protection [AUD_ERR]
4x <P/LD/B/G> LED driver failure/LED voltage protection [LD_ERR]
<LD/P/B>Error detection of the I2C communication between the Main device and the LD
IC.[BCM_ERR]
5x <P/T/G/B> Panel ID EEPROM I2C No ACK
(Also panel power failure is a suspect) [P_ID_ERR]
6x <P/G/B> Backlight failure [BACKLIGHT_ERR]
7x <P/B> Over temperature protection [TEMP_ERR]
8x -
Blue italic: detect at startup sequence only.
<G>: Power supply board,
<B>: Main board,
<T>: T-con board,
<LD>: LD board
<P>: Panel module,
<S>: Speaker
For China Models :
Please use FY19 remote (or older) to enter to Service Mode.
Self Diag.Quick Reference (LED blinking)
SAFETY NOTES SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE 11
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Self Diagnosis Quick Reference (Not LED blinking [Record Only])
<B>: Main board, <T>: T-con board, <H>: LED, IR & sensor board
Error Item NX / NXB / NX2
TU_DEMOD -
TCON ERR <T> T-CON device I2C communication failure
AUD_ERR_I2C <B> Audio amp I2C communication failure
TEMP_ERR_I2C <B/H> Temp sensor I2C communication failure
TU_DEMOD_I2C <B> Tuner & Demodulator I2C communication failure
EARC_ERR_I2C -
8KBE_COM_ERR -
8KSHV_ERR -
AMB_ERR_I2C -
SE LF DIAGN OSTIC FUN CTI ON
SAFETY NOTES SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE 12
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Self Diagnosis Service Menu
Entry (Self Diagnosis Display)
- Go to the standby by a remote.
- Push the buttons sequentially:
<Display> <5> <Vol-> <Power>.
Exit
- If you want to finish service mode app, do AC OFF/ON.
→*Service mode app is disable perfectly.
- If you want to move home menu, push <HOME> button.
→*Service mode app do background (not disable perfectly).
Self Diagnosis Display [Example]
SELF CHECK
002 MAIN POWER 050121081135 041231123456 031111182547 003
003 DC ALERT 000000000000 000000000000 000000000000 000
003 AUD ERR 000000000000 000000000000 000000000000 000
003 TU DEMOD 000000000000 000000000000 000000000000 000
003 AUD ERR I2C 000000000000 000000000000 000000000000 000
003 TU DEMOD I2C 000000000000 000000000000 000000000000 000
003 EARC ERR I2C 000000000000 000000000000 000000000000 000
004 LD ERR 000000000000 000000000000 000000000000 000
004 BCM ERR 000000000000 000000000000 000000000000 000
005 TCON ERR 000000000000 000000000000 000000000000 000
005 P ID ERR 000000000000 000000000000 000000000000 000
006 BACKLIGHT ERR 000000000000 000000000000 000000000000 000
007 TEMP ERR 000000000000 000000000000 000000000000 000
007 TEMP ERR I2C 000000000000 000000000000 000000000000 000
008 4KBE ERR 000000000000 000000000000 000000000000 000
00034 00231 00034 [Home]Exit [Up/Down]Scroll
002 MAIN POWER 050121081135 041231123456 031111182547 003
003 DC ALERT 000000000000 000000000000 000000000000 000
003 AUD ERR 000000000000 000000000000 000000000000 000
003 AUD ERR I2C 000000000000 000000000000 000000000000 000
003 TU DEMOD I2C 000000000000 000000000000 000000000000 000
004 LD ERR 000000000000 000000000000 000000000000 000
004 BCM ERR 000000000000 000000000000 000000000000 000
005 TCON ERR 000000000000 000000000000 000000000000 000
005 P ID ERR 000000000000 000000000000 000000000000 000
006 BACKLIGHT ERR 000000000000 000000000000 000000000000 000
007 TEMP ERR 000000000000 000000000000 000000000000 000
007 TEMP ERR I2C 000000000000 000000000000 000000000000 000
SELF CHECK
00034 00231 00034
Back
[Home]Exit [Up/Down]Scroll
SE LF DIAGN OSTIC FUN CTI ON
SAFETY NOTES SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE 13
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14
Retry Limitation by Remote/Power Key
Smart Core
Red LED blinking
count
Error Name Retry Permission Times *1 Note
2x MAIN_POWER STDWN_RTRY_LIMIT_MAINPOWR = 1
3x
DC_ALERT (5V) STDWN_RTRY_LIMIT = 2
AUD_ERR STDWN_RTRY_LIMIT = 2
4x
LD_ERR STDWN_RTRY_LIMIT = 2
BCM_ERR STDWN_RTRY_LIMIT = 2
5x P_ID_ERR STDWN_RTRY_LIMIT = 2
6x BACKLIGHT STDWN_RTRY_LIMIT = 2
7x TEMP_ERR STDWN_RTRY_LIMIT = 2
8x 4KBE_ERR STDWN_RTRY_LIMIT = 2
Number of off/on action during the
error shutdown is recorded to
STDWN_OFFON_CNT.
*1) If STDWN_OFFON_CNT <= STDWN_RTRY_LIMIT, and STDWN_OFFON_CNT_MAIN_POWER <= STDWN_RTRY_LIMIT_MAINPOWR,
you can turn the set on by a remote/power key. At this time, if the error occurs again, the STDWN_OFFON_CNT is incremented by 1.
*2) When the main micon operates normally for STDWN_OFFON_CLR = 60 minutes, STDWN_OFFON_CNT and
STDWN_OFFON_CNT_MAIN_POWER are cleared.
Number of off/on action for
MAIN_POWER shutdown is
recorded to
STDWN_OFFON_CNT_MAIN_
POWER.
SE LF DIAGN OSTIC FUN CTI ON
SAFETY NOTES SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE 14
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Before you make the service call…
1. Confirm the symptom from the customer.
2. Select that symptom from the chart.
3. Bring all the boards and cables listed for that symptom.
4. Follow the troubleshooting charts in the technical guides to isolate the board.
5. Chart Color Code
RED DOT: Most likely defective part
BLUE TRIANGLE: Secondary possible defective part
GREEN SQUARE: Tertiary possible defective part
BLACK TEXT: Board that may correct the symptom
Triage Chart (NX/NXB)
No
Power Remote Network Audio Smart Core Bluetooth (BT)
2 3 4 5 6 7 8
TU_
DEM
OD
TU_
DEM
OD_I
2C
TCO
N_ER
R
FRCT
C_I2
C
AUD
_ERR
_I2C
4KP
Q_E
RR_I
2C
TEM
P_ER
R_I2
C
EARC
_ERR
_I2C
AMB
_ERR
_I2C
No White Power
LED & does not
reponse to remote
(Dead Set)
Stationa
ry
colored
lines or
dots
No video
One of
Inputs
NO RF
input
No video all
Inputs
No Remote
Cannot
connect to
Wireless
Network
No Audio
Smart Core no LED (Set
is still alive)
Bluetooth / One Step
Remote (OSR) can't
connect
B* Board pl■ ■ ■ l l pl▲p p l l l p p lp p
G* Board lp■ ■ ■ l▲p
H* Board ●pl l
Speaker pl
Wifi & BT Module l l
LD* Board ▲▲p
V By One FFC p p p p
Tcon l l p■
LCD Panel ●▲l▲■l■
Power Power Panel
Panel
(Communication)
Panel
(Backlight)
TEMP 4KBE
Audio LD T c on
Reference
Symptoms - Shutdown. Power LED
blinking red diagnostics sequences
Video
- missing or distorted
Problem
Symptoms - no shutdown
Error log record only
Main Board
Power Board
Receiver Board
Local
Dimming Board
SAFETY NOTES SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE 15
TROUBLESH OOTI NG
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16
Reference
Symptoms - Shutdown. Power LED
blinking red diagnostics sequences Symptoms - no shutdown Error log record only
2345678
TU_DEMO
D
TU_DEMO
D_I2C
TCON_ERR
FRCTC_I2C
AUD_ERR_
I2C
4KPQ_ERR
_I2C
TEMP_ERR
_I2C
EARC_ERR
_I2C
8KBE_CO
M_ERR
AMB_ER
R_I2C
Main Board ▲● ● ■● ● ▲
Power Board ●▲ ▲ ▲
Receiving Board ●
Speaker ▲
Wifi & BT Module
Local Dimming
Board ▲
V By One FFC
Tcon
LCD Panel ●▲
Problem Power Power Panel
Panel
(Communic
ation) Panel
(Backlight)
TEMP 4KBE
Audio LD Tcon
SAFETY NOTES SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE
TROUBLESH OOTI NG
Before you make the service call…
1. Confirm the symptom from the customer.
2. Select that symptom from the chart.
3. Bring all the boards and cables listed for that symptom.
4. Follow the troubleshooting charts in the technical guides to isolate the board.
5. Chart Color Code
RED DOT: Most likely defective part
BLUE TRIANGLE: Secondary possible defective part
GREEN SQUARE: Tertiary possible defective part
BLACK TEXT: Board that may correct the symptom
Triage Chart (NX2)
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17
Reference
No
Power Video - missing or distorted Remote Network Audio Smart Core Bluetooth (BT)
No White Power
LED & does not
response to remote
(Dead Set)
Stationary colored
lines or dots
No video One of
Inputs NO RF input No video all Inputs No Remote
Cannot connect to
Wireless Network No Audio
Smart Core no LED
(Set is still alive)
Bluetooth / One Step
Remote (OSR) can't
connect
Main Board ▲ ▲ ● ● ▲ ▲ ●▲ ▲
Power Board ●▲ ▲
Reiving Board ▲● ●
Speaker ●
Wifi & BT Module ● ●
Local Dimming
Board ▲
V By One FFC ▲ ▲
Tcon ▲■
LCD Panel ●■
Problem
Triage Chart (NX2)
SAFETY NOTES SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE
TROUBLESH OOTI NG
Before you make the service call…
1. Confirm the symptom from the customer.
2. Select that symptom from the chart.
3. Bring all the boards and cables listed for that symptom.
4. Follow the troubleshooting charts in the technical guides to isolate the board.
5. Chart Color Code
RED DOT: Most likely defective part
BLUE TRIANGLE: Secondary possible defective part
GREEN SQUARE: Tertiary possible defective part
BLACK TEXT: Board that may correct the symptom
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1.0 No power
BM5/BM5S Board Model
No Power
Check STBY 3.3V
C1708
near CN1700 on
BM5/BM5S board
Harness
G* Board
Replace
Harness between G* Board to
BM5/BM5S Board
BM5/BM5S
Board
NG
OK
NG
OK
u-Com Failure
DDCON/LDO
Main Device Failure
TROUBLESH OOTI NG
SAFETY NOTES SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE 18
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1.2 No Power u-com Failure P-on u-com control signal path summary
GND
GND
P-on u-com
IC401
G-Board
DDC : 0.8V_M5_CORE (IC804)
DDCs : 5V_MAIN&5.0V_VBUS&5V_AUDIO (IC600),
_MAIN &3.3V_AUDIO(IC601), 1.0V_TU_P (IC603), 3.3V
1.8V_M5 (IC807), 1.0V_M5 (IC808),
0.8V_M5_CPU (IC810), 0.8V_M5_GPU (IC811)
LDOs : 5.0V_MAIN_H (IC400), 3.3V_MAIN_H (IC403)
FET SW : 3.3V_TU_P (Q602/Q603)
SOC Muffin 5 (IC1000)
P_ON_#1
PGOOD_1
P_ON_#2
OPWRSB
R457
#pin2
#pin14
#pin9
#pin12
#pin13
#pin10
#pin6
3.3V_STBY
POWER_ON
ORESETB
#pin7
BL_ON
DC_OFF_DET
#pin18 P_ON_HL FET SW : 12.7V_LNB (Q604/Q605)
SW IC : 3.3V_TU_P (Q609 –IC604)
USB VBUS SW (IC3803/IC3804)
#pin11
ADC port
#pin8
12.7V_AUDIO
R462
#pin16
ADC port
R444
X_BL_MUTE
#pin3
12.7V_MAIN R450
#pin20
R443
LD-Board
VDD
12V_MON
GND
TYPE_DET
MIC_PWR_ON
DC_MON
#pin17
GND
3.3V_STBY
R445 R446
TROUBLESH OOTI NG
Main Board
SAFETY NOTES SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE
BM5 Board LCD Model
19
SYSSET
2021/04/2723:25:57(GMT+09:00)

START
yes
Check POWER_ON
CL419 or R470 Voltage.
Is the voltage >3.0V?
Try AC Off and On after few minutes.
If #pin10 keep Low, change IC401.If #pin10
goes High few seconds and downs to Low,
Check 12.7V_MAIN Line (from G board).
no
yes
Check 12V_MON
R462 Voltage.
Is the voltage >2.6V?
Check 12.7V_MAIN Line
and 12.7V_AUDIO Line
(from G board).
no
yes
yes
Change IC401
no
Check DC_OFF_DET
CL414 or R465 Voltage.
Is the voltage >3.0V?
Check P_ON_#1
CL418 or
P-on u-com #pin12
(IC401) is >3.0V?
Change IC401
no
Continue next page…
Check VDD
C442 Voltage.
Is the voltage >3.0V?
Check 3.3V_STBY Line
(C1708, CN1700 #9pin)
no
Check TYPE_DET
CL408 or R451 Voltage.
Is the voltage 2.6±0.2V?
no
yes
Check OPWRSB
CL411 or R460 Voltage.
Is the voltage 0V?
SOC
Muffin 5 problem
IC1000 # AP17 OPWRSB
no
yes
Check PGOOD_1
CL413 or R456 Voltage.
Is the voltage >3.0V?
1.3 No POWER –
DDCON/LDO
Check 0.8V_M5_CORE
DDCON (IC804)
no
yes
Type Detection Circuit problem.
Check TYPE_DET Line (R445, R446).
TROUBLESH OOTI NG
SAFETY NOTES SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING SERVICE ADJUSTMENT DIAGRAM HANDLING GUIDE
1.2 No Power u-com Failure
BM5 Board LCD Model
20
SYSSET
2021/04/2723:25:57(GMT+09:00)