Sony KD-55A8F Schematic

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HISTORY INFORMATION FOR THE FOLLOWING MANUAL:

SERVICE MANUAL (COMMON)

GN4TR CHASSIS
ORIGINAL MANUAL ISSUE D ATE: 03/2018
Version Date Subject
1 03/2018 1st Issue
OLED TV
9-888-748-01
For SM - Unique , please refer :
9-888-748-Ax ( America )
9-888-748-Cx ( China)
9-888-748-Ex ( Europe )
9-888-748-Px (Asia)
SYSSET
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SERVICE MANUAL (COMMON)

GN4TR CHASSIS
OLED TV
SYSSET
KD
KD
KD
KD
XBR
XBR
KJ
KJ
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MODEL LIST

THIS SERVICE MANUAL CONTAINS COMMON INFORMATION FOR BELOW REGIONS AND MODELS:
REGION ASIA AMERICA EUROPE CHINA
MODEL
-55A8F
-55AF8
-55A8F
-55A8F
-65A8F
-65AF8
-65A8F
-65A8F
JAPAN
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Title
Page
SAFETY NOTES
SELF DIAGNOSTIC FUNCTION TROUBLE SHOOTING
4.
SERVICE ADJUSTMENTS
5.
DIAGRAMS
PANEL and TV SET HANDLING
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TABLE OF CONTENTS
Section
1.
2.
3.
6.
5
10
14
69
79
81
Please refer Service Manual – Unique for below information :
-Disassembly and Removal Caution
-Wire Dressing
-Circuit Board Location
-Exploded Views and Parts List
Note: Pictures provided in this Service Manual might have slight difference from the actual sets.
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1-1. Warnings and Caution
1) CAUTION :These servicing instructions are for use by qualified service personnel only.
2) To reduce the risk of electric shock, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so.
3) WARNING!! : An isolation transformer should be used during any service to avoid possible shock hazard, because of live chassis. The chassis of this receiver is directly connected to the ac power line.
SECTION 1
SAFETY NOTES
Whenever a TV Main board is replaced, the correct TV Model and Serial number must be reinserted into memory.
This is a MANDATORY procedure that each service center must apply. Please refer to the chapter of ADJUSTMENT in this service manual to
find out how to set the model number and serial number in service mode.
1-2-1. Caution Handling of LCD Panel
The replaceable fuse could be in the neutral of the mains supply. When replacing the fuse, the mains shall be disconnected for de-energize the phase conductors.
(*Except AC ADAPTOR, Because it does not carry out replacing an internal fuse.)
4) CARRYING THE TV : Be sure to follow these guidelines to protect your property and avoid causing serious injury :
• Carry the TV with an adequate number of people; larger size TVs require two or more people.
• Correct hand placement while carrying the TV is very important for safety and to avoid damages.
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 this manual. Follow these procedures whenever critical components are replaced or improper operation 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 carried out with Main board replacement.
are identified in
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 frame edge 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 LCD panel 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 LCD panel with a soft cloth material.
8) Use care when handling the wires or connectors of the inverter circuit. Damaging the wires may cause a short circuit.
9) Protect the panel from ESD to avoid damaging the electronic circuit (C-MOS).
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10) During the repair, DO NOT leave the Power On or Burn-in period for more than 1 hour while the TV is face down on a cloth. Refer Figure 1 .
Figure 1.
1-2-2. Caution for OLED Panel
1) Handling
When repairing the TV set, be sure you are grounded by using a wrist band.
*Do not press on the panel or frame edge to avoid the risk of electric shock. *Do not scratch or press on the panel with any sharp objects. *Do not leave the module in high temperatures or in areas of high humidity
for an extended period of time. *Do not expose the panel to direct sunlight. *Avoid contact with water. It may cause a short circuit within the module. *Disconnect the AC power when replacing. *Always clean the panel with a soft cloth material. *Use care when handling the wires or connectors. Damaging the wires may
cause a short. *Protect the panel from ESD to avoid damaging the electronic circuit.
*Do not recommend power-on in the conditions which laid face down the panel, in repair activity. Refer Figure 1 . *When transporting by hand, do not put stress on the panel and the frame around the screen. Refer to the panel handling chapter of each Service manual, or the "Transporting" information of the Reference Guide of each model for how to hold it.
2) OLED Screen
•Although the OLED screen is made with high-precision technology and
99.99% or more of the pixels are effective, black dots may appear or bright points of light (white, red, blue, or green) may appear constantly on the OLED screen. This is a structural property of the OLED screen and is not a malfunction.
•Do not push or scratch the front filter, or place objects on top of this TV set. The image may be uneven or the OLED screen may be damaged.
•The screen and cabinet get warm when this TV set is in use. This is not a malfunction.
3) Precautions to Protect the Screen from Damage
Image retention
OLED TV’s are susceptible to image retention (burn-in) due to the characteristics of the materials used. Image retention may occur if images are displayed in the same location on the screen repeatedly or over extended periods of time. This is not a malfunction of the TV. Avoid displaying images that may cause image retention.
The following are examples of images that may cause image retention:
•Content with black bars either on the top and bottom and/or the left and right sides of the screen. (for example, Letterboxed, 4:3 screen, Standard definition)
•Static images such as photos.
•Video games that might have static content in some part of the screen.
•On-screen menus, program guides, channel logos etc.
•Static content from applications.
•On-screen tickers, such as those used for news and headlines.
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To reduce the risk of image retention:
•Fill the screen by changing [Wide mode] to eliminate the black bars. Select [Wide mode] other than [Normal].
•Turn off the OSD (On Screen Display) by pressing the DISPLAY button, and turn off the menus from connected equipment. For details, refer to the instruction manuals for the connected equipment.
•Avoid displaying static images with bright colours (including white), clocks or logos on any portion of the screen.
•Set the picture settings based on the ambient conditions. The Standard Picture is recommended for home use and when viewing content that often displays the station logos, etc. The TV has following features to help reduce/ prevent image retention. Press the HOME button, then select [Settings] – [Picture & Display] – [Expert panel settings] – the desired option.
Panel refresh
Panel refresh will automatically run to adjust the uniformity of the TV screen after it has been in use for long periods of time. Panel refresh can also be performed manually and should only be used if image retention is very noticeable or you see the following message: [Panel refresh did not finish...]
Caution:
•The Panel refresh function may affect the panel. As a reference, perform the Panel refresh only once a year, do not perform it more than once a year as it may affect the usable life of the panel.
•Panel refresh takes about one hour to complete.
•A white line may be displayed on the screen during the Panel refresh, this is not a malfunction of the TV.
•Panel refresh will only work when the room temperature is between 10 ºC and 40 ºC.
Pixel shift
Automatically moves the image on the screen to prevent image retention.
Other feature
The screen brightness is automatically reduced when displaying still images, clocks, bright colours or logos etc.
IMPORTANT REMINDER FOR OLED PANEL REPLACEMENT When carrying out OLED panel replacement, it is mandatory of a service center to confirm and record Panel ON time & Panel Refresh times. It is because they are indispensable information in order to clarify responsibility for image retention after panel replacement. Please refer to the chapter of SELF DIAGNOSIS FUNCTION in this service manual to find out how to confirm the Panel ON time & Panel Refresh times in service mode.
1-3. Caution About the Lithium Battery
1) Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type.
2) Outer case broken battery should not contact to water.
1-4. Safety Check-Out
After correcting the original service problem, perform the following safety checks before releasing 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 straps and mounting hardware have been replaced. Be absolutely certain you have replaced all the insulators.
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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.
1-5.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 -m et er (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 Leakage Current
1-6. How to Find a Good Earth Ground
1) A cold-water pipe is a guaranteed earth ground; the cover-plate retaining screw on most AC outlet boxes is also at earth ground.
2) If the retaining screw is to be used as your earth 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 trouble­light (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.
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1-7. Lead Free Information
The circuit boards used in these models have been processed using Lead Free Solder. The boards are identified by the LF logo located close to the board designation.
The servicing of these boards requires special precautions. It is strongly recommended to use Lead Free Solder material in order to
Figure 4: LF Logo
Figure 5: LF logo on circuit board
guarantee optimal quality of new solder joints.
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The units in this manual contain a self-diagnostic function. If an error occurs, the Smar t C ore R ed LE D will automatically begin to flash. The number of times the LED flashes translates to a probable source of the problem. A definit ion of the Smart Core Red LED flash indicators is listed in the instruct ion manual for the user’s knowl edge and reference. If an error symptom cannot be reproduced, the r emote c ommander can be used to review the failure occurrenc e data stored in memory to reveal past problems and how often these pr oblems occur.
DIAGNOSTIC TEST INDICATORS When an error occurs , the Smart Core Red LED w il l flash a set number of times to indicate the poss i ble cause of the problem. If there is more than one error , the LED wil l identify the first of the problem areas . Result for all of the foll owing diagnostic items are displayed on screen. If the screen display s a “ 0”, no error has occ urr ed .
Self Diag. Quick Reference (LED blinking)
SECTION 2
SELF DIAGNOSTIC FUNCTION
Smart Core RED
LED blinking count
2x <B/G> Main 12V over voltage [MAIN_POWER]
3x
4x <T/B>TCON internal error/TCON I2C communication error[LD_ERR]
5x
6x <G/B> G board error[BACKLIGHT]
7x
8x <B> 4KBE Error (4KBE WDT)
Detection Items
<B/G> Main 5.0V failure [DC_ALERT]
<B/S/G> Audio amp. protection [AUD_ERR]
<P/T/G/B> Panel ID EEPROM I2C No ACK
(Also panel power failure is a suspect) [P_ID_ERR]
<T/B>Data corruption in EEPROM[P_ID_ERR]
<B/P> Over temperature protection [TEMP_ERR] <B> Temp. sensor I2C No ACK [TEMP_ERR]
Blue italic: detect at startup sequence only.
<G>: Power supply board, <B>: Main board, <T>: T-con board, <P>: Panel module, <S>: Speaker, <Tu>: Tuner board,
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Self Diag. Quick Reference (Not LED blinking [Record Only])
Error Item
( Not LED blinking
[Record Only])
TU_DEMOD
TCON ERR
AUD_ERR_I2C <B> Audio amp I2C communication failure
Detection Items
<B/Tu> Tuner & Demodulator I2C communication failure Tuner board set detect signal monitoring
None *CR is shutdown by I2c communication failure[LD_ERR]
<G>: Power supply board, <B>: Main board, <T>: T-con board, <P>: Panel module, <S>: Speaker, <Tu>: Tuner board,
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Self Diagnosis Service Menu and Display
Entry (Self Diagno sis D ispl ay)
- 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 disabl e perfectly )
Format of error timestamps
YYMMDDhhmmss (in UTC) Example: 120823132523 -> Aug 23 2012 13:25:23 UTC * Only when time is set, an error timestamp is saved.
Smart Core Red LED blinking count
Error Item
Error count
SELF CHECK
Back
<<
002 MAIN POWER 000000000000 000000000000 000000000000 000 003 DC ALERT 000000000000 000000000000 000000000000 000 003 AUD ERR 150101000018 150101000018 150101000018 003 003 AUD ERR I2C 000000000000 000000000000 000000000000 000 003 TU DEMOD 150101000218 150101000223 150101000105 003 004 LD ERR 000000000000 000000000000 000000000000 000 004 BCM ERR 000000000000 000000000000 000000000000 000 005 TCON ERR 150101000504 000000000000 000000000000 001 005 P ID ERR 000000000000 000000000000 000000000000 000 006 BACKLIGHT ERR 000000000000 000000000000 000000000000 000 007 TEMP ERR 150101000200 150101000002 000000000000 002 008 4KBE ERR 000000000000 000000000000 000000000000 000
00005 00414 00002 [Home]Exit
Error timestamp for last recorded error
Error timestamp for second last recorded error
Error timestamp for 3rd last recorded error
Panel Operation Time clear
<7> -> <0>
Timestamps and Error Count clear <8> -> <0>
Total Operation Time and Boot Count clear <9> -> <0>
Total Operation Time [hr] – Boot Count – Panel Operation Time [hr]
•Panel Operation Time is recorded every 30 min, but Total Operation Time is recorded every 1 hr. Therefore, the panel op. time might become larger than the total op. time.
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Self Diagnosis Display

How to confirm
- Panel ON time
- Panel Refresh times
Enter Self Diagnosis D ispl ay. Then Push Green button’ on remote controller. Then display upper right corner.
Green button
4 5 6 7
2 3
8
9
Panel ON time[hour] /Panel Refresh times[times] Ex) 100 / 20
SELF CHECK
<<
Back
002 MAIN POWER 000000000000 000000000000 000000000000 000 003 DC ALERT 000000000000 000000000000 000000000000 000 003 AUD ERR 150101000018 150101000018 150101000018 003 003 AUD ERR I2C 000000000000 000000000000 000000000000 000 003 TU DEMOD 150101000218 150101000223 150101000105 003 004 LD ERR 000000000000 000000000000 000000000000 000 004 BCM ERR 000000000000 000000000000 000000000000 000 005 TCON ERR 150101000504 000000000000 000000000000 001 005 P ID ERR 000000000000 000000000000 000000000000 000 006 BACKLIGHT ERR 000000000000 000000000000 000000000000 000 007 TEMP ERR 150101000200 150101000002 000000000000 002 008 4KBE ERR 000000000000 000000000000 000000000000 000
;
00005 00414 00002 [Home]Exit
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Before yo u make the service call…
1. Confirm the symptom from the customer .
2. Select that symptom from the chart.
3. Bring all the boards and c abl es listed for that symptom.
4. Follow the troublesho oti n g charts in the technical guides to isol ate the board.
5.
RED DOT: Most likely defective par t
BLUE TRIANGLE: Secondary possible defectiv e part
BLACK TEXT: Board that may correct the symptom
FRCT C_I2
R_I2
LED & does not Stationary
dots
No Remote
    
  
  
 
 
  
(Communication)
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T r i ag e C har t
Chart Colour Code
SECTION 3
TROUBLESHOOTING
Symptoms - Shutdown. Power LED blinking red diagnostics sequences
Reference
2 3 4 5 6 7 8
B* Board
G* Board
H* Board
Actuater
(Panel module)
Speaker
(Sub woofer)
Wifi & BT
Module
V By One FFC
Tcon
(Panel module)
OLED Panel
(Panel module)
Problem
Power Power Tcon
Audio
Panel
Panel
Power
TEMP 4KBE
Symptoms - no shutdown
Error log record only
TU_
TCO
DEM
N_E
OD
RR
AUD
_ER
4KPQ_ERR_
C
I2C
C
Power
No White Power
reponse to
remote (Dead
No
Set)
Video
- missing or distorted
No video
colored lines or
One of Inputs
NO RF
input
Remote Network Audio Smart Core Bluetooth (BT)
No video
all Inputs
Wireless
can't connect
No Audio
Smart Core no LED
(Set is still alive)
Bluetooth / Voice
Remote can't
connect
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TROUBLESHOOTING Flow

1.0 No Power

BM2A Board Model
No Power
Check STBY 3.3V
C408
near CN400
on BM2A board
OK
BM2A Board
NG
Replace
Between G* Board to
BM2A Board Harness
OK
Harness
u-Com Failure
DDCON/LDO
NG
G* Board
Main Device Failure
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1.2 No Power u-com Failure
+3.3V_STBY
#pin6 Vdd u-com supply voltage
#pin9
P-on u-com control signal path summary
BM2A
PGOOD_1
DDC : +1.0V_M2 (IC604)
TCON_P_ON
Delay (IC408)
G-Board
+12V_MAIN
AC_OFF_DET_OUT
from SOC BE (IC4000)
R426
R427/Q410
BL_ON
POWER_ON
R446
GND
R439
#pin7
#pin10
#pin16 12V_MON ADC port
#pin11 DC_MON ADC port
#pin12
P_ON_#1
DDCs : +1.8V_TU (IC405), +1.0V_BE (IC4003)
DDCs : +5V_MAIN (IC402), +3.3V_MAIN (IC403),
P-on u-com
IC401
#pin13
P_ON_#2
+1.5V_BE (IC4001), +1.1V_BE (IC4002) LDOs : +1.05V_M2_A_1 (IC603), +1.05V_M2_A_2 (IC606), VCC3IO_EMMC (IC607), +1.8V_BE (IC 4004)
DDC : +12V_LNB (Q408/Q409)
#pin18
#pin2
#pin14
#pin3
#pin20
#pin8
P_ON_HL
OPWRSB
ORESETB
DC_OFF_DET
X_SYSTEM_RST
BE_PANEL_PWR_ON_#2
USB VBUS SW (IC3406, IC3407, IC3408)
SOC Muffin 2 (IC1000)
Tuner (TU2802/TU2803)
SOC BE (IC4000)
GND
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1.2 No Power u-com Failure
START
Check VDD
C506 Voltage.
Is the voltage >3.0V?
no
Check +3.3V_STBY Line (C408, CN400 #9pin)
Check 12V_MON
R446 Voltage.
Is the voltage >2.6V?
no
Check +12V_MAIN Line (from G board). Check “AC_OFF_DET_OUT” (from BE SOC IC4000) Check “AC_DET_IN” (C407, CN400 #16pin from G board)
yes
Check TYPE_DET
R428 Voltage.
Is the voltage 2.6±0.2V?
yes
Check OPWRSB
R443 Voltage.
Is the voltage 0V?
yes
Check POWER_ON
R526 or P-on u-com #pin10
Is the voltage >3.0V?
yes
no
no
no
Type Detection Circuit problem. Check TYPE_DET Line (R521, R522, R523).
SOC Muffin 2 problem
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 +12V_MAIN Line (from G board).
yes
Check DC_OFF_DET
R448 or P-on u-com #pin3
is >3.0V?
yes
Check P_ON_#1
CL418 or P-on u-com #pin12
is >3.0V?
yes
Check PGOOD_1
R440 Voltage.
Is the voltage >3.0V?
Continue next page…
no
Change IC401
no
Change IC401
no
1.3 No POWER - DDCON/LDO Check 1.0V DDCON (IC604)
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1.2 No Power u-com Failure
Previous page
Check P_ON_#2
CL417 or P-on u-com #pin13
is >3.0V?
yes
Check P_ON_HL
CL414 or P-on u-com #pin18
is >3.0V?
yes
Check ORESETB
CL416 or P-on u-com #pin14
Is the voltage >3.0V?
yes
Check X_SYSTEM_RST
CL412 or P-on u-com #pin20
Is the voltage >3.0V?
no
no
no
no
Change IC401
Change IC401
Change IC401
Change IC401
Check BL_ON
R527 or P-on u-com #pin7
Is the voltage >3.0V?
yes
END
u-com IC401 is working OK
no
Change IC401
yes
Check
BE_PANEL_PWR_ON_#2
R441 or P-on u-com #pin8
Is the voltage >3.0V?
yes
no
Check “X_BE_RST” (from SOC Muffin). *If X_BE_RST is >3.0, SOC BE(IC4000) problem. Otherwise, SOC Muffin(IC1000) problem.
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1.3 No Power DDCON/LDO

Check item summary
Board IC Ref Voltage supply Output ref. Enable pin Enable source Fuse Vcc ref.
BM2A IC402 +5V_MAIN/+5V_AUDIO C430 R455 P-on u-com IC401 #pin13 F400 C423
BM2A IC403 +3.3V_MAIN/+3.3V_AUDIO C445 R465 P-on u-com IC401 #pin13 F401 C436
BM2A IC405 +1.8V_TU C463 IC405 #PIN5 P-on u-com IC401 #pin12 F403 C461
BM2A IC601 +1.5V_DDR C609 C605 R603 (3.3V or 5V) - C602 BM2A IC602 +1.05V_M2_STBY C611 IC602 #PIN3 C610 (+3.3V _STBY) - C610
BM2A IC603 +1.05V_M2_A_1 C613 IC603 #PIN3 P-on u-com IC401 #pin13 - C612
BM2A IC604 +1.0V_M2 C625 R623 P-on u-com IC401 #pin12 F600 C618
BM2A IC605 +1.05V_M2_ST_ET C631 IC605 #PIN3 M2 IC1000 #AP34 - C630
BM2A Board Model
BM2A IC606 +1.05V_M2_A_2 C633 IC606 #PIN3 P-on u-com IC401 #pin13 - C632
BM2A IC607 VCC3IO_EMMC (1.8V) C635 IC607 #PIN3 P-on u-com IC401 #pin13
BM2A IC4001 +1.5V_BE C4007 IC4001 #PIN5 P-on u-com IC401 #pin13 F4000 C4005
BM2A IC4002 +1.1V_BE C4014 IC4002 #PIN5 P-on u-com IC401 #pin13 F4001 C4012
BM2A IC4003 +1.0V_BE C4027 R4020 P-on u-com IC401 #pin12 F4002 C4020
BM2A IC4004 +1.8V_BE C4001 IC4004 #PIN3 P-on u-com IC401 #pin13 - C4000
(Supplementary
information)
C634
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1.3 No Power DDCON/LDO
DDCON check
Check IC402 Vcc voltage
Is voltage >12V?
Check Vcc voltage
Is voltage >4V?
START
C423
yes
C602
yes
no
no
Check Vcc voltage
C602
Is voltage >3V?
yes
Check
D601
Is diode alive?
yes
no
no
BM2A Board Model
IC Ref Voltage supply
IC601 +1.5V_DDR
Check
D600
Is diode alive?
yes
Change D601
Check +5V_MAIN DDCON (IC402)
no
Change D600
Check +3.3V_STBY.
G* board
Check Enable
IC600 #pin1
Is voltage >2.5V?
yes
Change DDCON
IC601
no
Change IC600
20
(Supplementary
information)
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1.3 No Power DDCON/LDO
DDCONs check
IC Ref Voltage supply
IC402
+5.0V_VBUS/+5V_MAIN
+3.3V_STBY (AC-ADP only)
IC403
/+3.3V_MAIN
Q407 +3.3V_MAIN
IC405 +1.8V_TU
IC601 +1.5V_DDR
IC604 +1.0V_M2
IC4001 +1.5V_BE
START
Check fuse
F4xx / F40xx/F6xx
Is fuse OK?
yes
Check Vcc voltage
C4xx / C40xx/C6xx
Is voltage >12.0V?
yes
BM2A Board Model
Please refer page-19 for Ref number.
no
Change Fuse
no
1) Check POWER_ON P-on u-com #pin10 (Refer 1.2 No Power U-Com Failure)
2) Check G* board
IC4002 +1.1V_BE
IC4003 +1.0V_BE
Check Enable pin
voltage
Is voltage >2.5V?
yes
Change DDCON IC
no
1.2 No Power U-Com Failure or
Enable source
21
(Supplementary
information)
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1.3 No Power DDCON/LDO
LDOs check
IC Ref Voltage supply
IC602 +1.05V_M2_STBY
IC603 +1.05V_M2_A_1
IC605
+1.05V_M2_ST_ET
IC606 +1.05V_M2_A_2
VCC3IO_EMMC
IC607
(1.8V)
IC4004 +1.8V_BE
START
yes
Check Vcc voltage
C4xxx or C6xx
Is voltage >3V?
yes
Check Enable pin
voltage
Is voltage >3V?
yes
no
no
BM2A Board Model
Please refer page-19 for Ref number.
Check +3.3V_DDC_OUT
DDCON (IC403)
or
+3.3V_STBY (G* board)
1.2 No Power U-Com Failure or
Enable source
Change LDO IC
22
(Supplementary
information)
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1.4 NO POWER-Muffin2 Failure
Muffin2 Fail Suspected
Muffin2 LOG is
displayed
No
Power uCom and
DDCON/LDO OK?
Yes
Crystal X1000
Is there 24MHz?
Yes
Muffin reset released?
ORESETB=High
Yes
No
No
No
W rite DD R check
bootloader
Follow 1.2&1.3
Replace crystal
Check uCom
Follow 1.2
Is there DDR error?
No
Check Muffin Log
related to eMMC
Is there “CRC error”
No
Store SW log, check SW
behaviors.
Yes
Replace DDR
Yes
Replace eMMC
Yes
eMMC clock present?
No
Replace Muffin
Yes
W rite DD R check
bootloader
Is there DDR error?
No
eMMC
data corruption
Yes
Replace DDR
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1.5 NO POWER-Muffin2 Replacement
Muffin2
replacement
flow
eMMC erase
Muffin2 replacement
Data on eMMC need to be erase first before changing Muffin If cannot be erased, erase after replacing Muffin
SW write
(Supplementary
information)
24
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2.0 LED Blinking: 2x (Main power Error)

BM2A
2-time blinking
Check “+12V_MAIN”
at pin 1 1/13 of CN400
on BM2A Board,
Vol tage > 13.2V ?
No
BM2A Board
Yes
G* Board
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Check point for BM2A

Name Board PWB (A side) Detail
CN400
BM2A
+12V_MAIN
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2.1 LED Blinking: 3x (DC Alert Error)

BM2A
Check “POWER_MAIN”
at pin 17/19 of CN400
Voltage = 18.020.0V or
22.524.5V ?
3-time blinking
(DC Alert)
on BM2A board,
OK
Check “+5.0V_VBUS”
at C431 on BM2A board
4.959V<Voltage<5.285V?
OK
Retry
NG
G Board
Detail of 3x LED Blinking
Error Item Number of STBY
Trinity DC_ALERT 3 Main board 5V power rail monitoring
AUD_ERR 3 Audio amp error detection
Trinity3 Board: BM2A
LED flashing
NG
BM2A Board
Description
(Supplementary
information)
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Check point for BM2A
Name Board PWB (A side) Detail
CN400
BM2A
+5.0V_VBUS at C431
POWER_MAIN Pin17/19 of CN400
(Supplementary
information)
28
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