Sony KD-55XE800 Schematic
HISTORY INFORMATION FOR THE FOLLOW ING MANUAL:
SERVICE MANUAL (COMMON)
GN3TR CHASSIS
Version Date Subject
1 10/2016 1st Issue.
Segment: KF
2 02/2017 Add 49in and 55in models
LCD TV
9-888-720-02
For SM - Unique , please refer :
9-888-720-Ax ( America )
9-888-720-Cx ( China)
9-888-720-Ex ( Europe )
9-888-720-Px ( Pan As ia)
SERVICE MANUAL (COMMON)
GN3TR CHASSIS
Segment: KF
LCD TV
MODEL LIST
THIS SERVICE MANUAL CONTAINS COMMON INFORMA TION F OR BELOW REGIONS AND MODELS:
REGION
ASIA AMERICA EUROPE CHINA JAPAN
MODEL
FW-43XE8* FW-49XE8* FW-55XE8*
KD-43XE8* FW-49X8*E FW-55X8*E
KD-43X8*E KD-49XE8* KD-55XE8*
KJ-43X8*E KD-49X8*E KD-55X8*E
XBR-43X8*E KJ-49X8*E XBR-55X8*E
XBR-49X8*E
4. SERVICE ADJUSTMENTS
5. DIAGRAMS
TABLE OF CONTEN TS
Section Title Page
1. SAFETY NOTES 5
2. SELF DIA GNOSTIC FUN CTION 14
3. TROUBL E SHOOTIN G 18
124
135
Please refer to Service Procedure for Panel , Board and Software Change / Upgrade
Manual , part number 9-888-719-0x in TISS .
Please refer Service Manual – Unique for below information :
-Safety Warnings
-Wire Dressing
-Circuit Board Location
-Disassembly and Exploded View.
Note: Pictures provided in this Service Manual might have slight difference from the
actual sets.
4
SECTION 1
SAFETY NOTES
1-1. Warn ings and Caution
1) 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) 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.
4) 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) 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 improper
operation is suspected.
!
1-2. Caution Handling o f LCD Panel
When repairing t he LCD Panel, make s ure you are grounded wi th a wrist band.
When repairing t he LCD Panel on the wall, the panel must be secur ed usi ng the
4 mounting hol es on the rear cover .
1) Do not press the panel or frame edge to av oid the risk of electric shock.
2) Do not scr atch or press on the panel with any sharp objec ts.
3) Do not leave the module in high temper ature or in areas of high humidi ty for
an extended per iod of time.
4) Do not expose the LCD panel to direct sunlight.
5) Avoid contact with water . I t may cause short c irc uit within the module.
6) Disc onnect the AC power when replaci ng the backl ight (C CFL) or
inverter cir cuit . (Hi gh voltage occur s at the inver ter ci rcui t at 650Vrms)
7) Always clean the LCD panel with a soft cloth mater ial .
8) Use care when handli ng the wir es or connectors of the inver ter ci rcui t.
Damaging the wires may cause a short circuit.
9) Protect the panel from ESD to avoid damaging the elec troni c circuit (C-MOS).
10) Dur i ng the r epai r , D O NO T l eav e the Pow er On or Burn-in period for more
than 1 hour w hil e the T V i s face dow n on a c l oth.
Figure 1. TV is faced down on a cloth during repair.
5
1-3. Caution About the Lithium Battery
1) Danger of explosion if battery is incorrectl y replaced. Replace only with
the same or equivalent type.
2) Outer case broken battery shoul d 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.
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 T est
(To protect elec tri c shock when custom er touch the ter minal .)
Leakage curr ent can be measured by V: Voltmeter or oscilloscope (r.m.s. or
peak reading)
Stabilized pow er supply instrument and isol ated voltage transform er:
Use too much curr ent c apacity and isol ated voltage tr ansformer does not
need to use stabili zed power supply equipm ent.
Specificati on of RM S volt meter: I nput res istanc e > 1 Mohm, I nput
capacitance < 200 pF, Frequency range: 15 Hz – 1MH z . Refer Figure 1.
Isolated ty pe volt -meter (F LUKE 8921A etc *1)
*1 Not use FLUKE 8920A that c onnected to prot ectiv e eart h by diode
# Leakage current of measurement instrument is less than 10μArms when
under test equi pment AC plug is opened
# Set up the following conditi on and tur n on the set. Applied v oltage:
Nominal i nput volt age (Des cri ption on Nam eplate)
# Measur e the leakage cur rent bet ween one phas e conduc tor and neutral
for termi nal 1 and termi nal
2. Read rms value, and then calculate to peak value PEAK VALUE =√2
RMS VALUE
Comply w ith the following requir ement
Class II equipment (2-pin pl ug): for eac h termi nal, the w orst val ue of
measurement m ust not exceed AC 283uA peak).
Note: includi ng AC adaptor, AC adaptor/DC operated unit combi nation
Note: Products which are always used in touch with human body: 141uA
(peak)
Note: As for products destined for Southeast Asia (Rod Antenna is
accessory . Or it is packed with a pr oduc t.) , the worst value must not exceed
AC 141uA (peak).
Figure 1 – Measuring network
for Leakage Current
6
1-6. How to Find a Good Earth Ground
1) A cold-water pipe is a guaranteed ear th ground; the cover-plate retaining
screw on most AC outlet boxes i s also at earth ground.
2) If the retaining scr ew is to be used as your earth ground, v erify that i t is at
ground by measuri ng the resistanc e between i t and a c ol d-w ater pipe w ith an
ohmmeter. The readi ng should be zer o ohms.
3) If a cold-water pipe is not accessi ble, connec t a 60- to 100-w att troublelight (not a neon lamp) between the hot side of the recept acle and the
retaining scr ew. Tr y both slots, if necess ary, to locate the hot s ide on the line;
the l am p shoul d l i ght at normal br il l i ance i f the sc r ew i s at gr ound pot enti al
(see Figur e 3).
Figure 3. Checking for earth
ground.
1-7. Lead Free Information
The circui t boards used i n these model s have been pr ocessed using Lead
Free Solder. The boards ar e identified by the LF logo loc ated clos e to the
board designation.
1-8. Handling the FLEXIBLE FLAT CABLE (FFC)
When you insert / pull out FFC, please grasp a reinforcement board and main
body of FFC.
The servic ing of these boar ds r equires special precautions. It is strongly
recommended to use Lead Free Solder m ateri al in order to guarantee optim al
Figure 4: LF Logo
Figure 5: LF logo on circuit board
quality of new solder joi nts.
7
1-8. Handling the FLEXIBLE FLAT CABLE (FFC) ( continue )
<INSERTION>
Insert pr operl y wit hout slanti ng
<PULL OUT>
Press rel ease button at the sam e
time pull out FFC cable
8
1-8. Handling the FLEXIBLE FLAT CABLE (FFC) ( continue )
9
1-8. Handling the FLEXIBLE FLAT CABLE (FFC) ( continue )
10
1-9. Solder-less tuner replacement procedure
① The insertion & extraction angle of the module is permitted to
specified degree for connec tor
For removing Tuner Module,
In the case of small type Tuner module.
After un screwed, Automatically the Module
will float to co rrect degree.
So please extract it with keeping this degree.
θ≒20°
Service manual operation (agreed by service member):
Not using insertion jig. Due quantity not many as production.
SC can control by:
1) Issue service manual for WW ASC.
2) Give training/lecture how to assemble tuner. Will be handle by SOEM
service
Push down to screw.
20°
Please c o nfirms whether no dust and no bend on
terminal of connecter(CN2800) and card-edge
connecter
Attachm e nt order of screw.
1. Side of antenna ter minal (W/BFX board).
2. Rear side of Tuner module.
1
2
11
1-9. Solder-less tuner replacement procedure (Cont. )
12
1-9. Solder-less tuner replacement procedure ( Cont. )
13
SECTION 2
SELF DIAGNOSTIC FUNCTION
The units in this ma nual conta i n a self-diagnostic function. If an error occurs, the Smart Co re Red LED will automatic ally begin t o flash.
The number of times the LE D flashes t ra nslates to a pr obab l e sour c e of the p roblem.
A definiti on of t he Smart Co re Red LE D fla s h indica t or s is list ed in t he ins truc ti on manu a l for the us er ’s knowled g e a nd r efer enc e.
If an error symptom ca nnot b e r epr odu ced, the r emote c omman d er ca n be us ed t o review t he f a ilu r e occur rence da t a stored in memory to reveal past problems and how
often thes e p r ob lems oc cu r .
DIAGNOSTIC TEST INDICATORS
When an error occurs, the Smart Co re Red LED will f lash a set nu mber of ti mes to indi c ate the possi ble cause of the pr oblem.
If ther e is more than one er ror , the LED will identify the f irst of the p roblem a reas .
Result for all of the following diagnostic items are displayed on screen.
If the scr een dis p la ys a “0”, no error has occu r r ed .
Smart Core RED
LED blinking count
2x
3x
4x
(KP/KPSP/KS
only )
5x
6x <G/P/B/LD> Backlight failure [BACKLIGHT]
7x
8x (KP/KPSP)
8x (KS)
Detection Items
<B/G/A/LD> Main 12V over voltage [MAIN_POWER]
<B> Main 5.0V failure [DC_ALERT]
<B/S/K> Audio amp. protection [AUD_ERR]
<LD/P> LED driver failure/LED voltage protection [LD_ERR]
<LD/P>Error detection of the I2C communication between the
Main device and the LD IC.[BCM_ERR]
<P/T/G/B> Panel ID EEPROM I2C No ACK (Also panel power
failure is a suspect) [P_ID_ERR]
Over temperature protection [TEMP_ERR]
<B> Temp. sensor I2C No ACK [TEMP_ERR]
<B> 4KBE Error (4KBE WDT)
<B> 4KPQ Error (4KPQ WDT)
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,
<A>: Power Adapter,
<Tu>: Tuner board,
<K> : Audio board (KFW/KPSP only)
(if AC adapter model, it would power supply for Set),
14
Record Only
Item
TU_DEMOD
TCON ERR
(KP/KPSP/KS/KH only )
FRCTC_I2C
(KS/KH)
(KF/KFW/KFC)
Detection Items
<B/Tu> Tuner & Demodulator I2C communication failure
Tuner board set detect signal monitoring
<T> T-CON device I2C communication failure
<B> FRC device is not finished Initial sequence
FRC device I2C communication failure
<T/B> FRC device is not finished Initial sequence
FRC device I2C communication failure
Blue italic: detect at startup sequence only.
<G>: Power supply board,
<B>: Main board,
<T>: T-con board,
<LD>: LD board
(if AC adapter model, it would power supply for Set),
<P>: Panel module,
<S>: Speaker,
<A>: Power Adapter,
<Tu>: Tuner board,
<K> : Audio board (KFW/KPSP only)
AUD_ERR_I2C
(KP/KPSP/KS/KH only )
<B/K> Audio amp I2C communication failure
4KPQ_ERR_I2C
(KS/KH only)
<B> 4KPQ d e vice I 2C communicatio n failure
LED Pattern
When safety shutdown occurs, Standby LED display reports the cause by using the lightning patterns as indicated below.
0.5sec
Example: The figure above shows LED display when SHUTDOW N is caused by Audio Error.
It repeats f lashing f or a specified number of times in 0.5s ec/cycl e and has a 3 seconds interval of lighting off.
Please note th at a 3 sec onds int erv al of light ing off is fixed regar dl ess of abnor m al s tate typ es.
0.5sec
3.0sec 3.0sec
15
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)
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
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 150101000123 150101000045 150101000045 003
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 count
Error
timestamp
for 3rd
last
recorded
error
Panel Operation Time clear
<7> -> <0>
Timestamps and Error Count clear
<8> -> <0>
Tot al 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 Tot al
Operation Time is recorded every 1 hr.
Therefore, the panel op. time might become larger than the
total op. time.
16
Triage C hart
Remote
Bluetooth
No White Po wer
LED & does not
colored
lines or
dots
One of
Smart Core
(Set is still
Bluetooth /
(OSR) can't
Before you make t he service cal l…
1. Confirm the symptom from the customer.
2. Select that sympto m fro m the chart.
3. Bring a ll the b o a r d s and ca b les liste d for that symp to m.
4. Follow the troub lesho oting c harts in the technical guid es to isolate the boar d.
5. Chart
Color Code
RED DOT: Mo st likely defective pa r t
BLUE TRIANGLE: Secondary possible defective part
ABC BLACK TEXT: Board that may correct the symptom
Symptoms - Shutdown. Power LED
blinking red diagnostics sequences
Reference
2 3 4 5 6 7 8 9 10
B* Board
Power
reponse to
remote (Dead
Set)
No
Video
- mi ssing or
distorted
Station
ary
video
Inputs
No
No
video
all
Inputs
No
Remote
Networ
k
Wireless
can't
connect
Audio
No
Audio
Smart
Core
no LED
alive)
GN3 KF segment
(BT)
One Step
Remote
connect
G* Board
H* Board
K* Board
Speaker
Wifi & BT
Module
LD* Board
V By One
FFC
Tcon
LCD Panel
17
SECTION 3
TROUBLESHOOTING
KF/KFW 55” No Power(GL71 PS U board)
Switch Off plug(AC Off)
NO POWER
Check
Fuse F6101,
Open?
Open T V rear c ov er to check PS U Boar d
Wait more than 5 minutes before start
This is to ensure PSU is not in protection mode
PSU broken*
Yes
Replace PSU
Connector CN6401
Check
BL_ON
PIN 7
No Voltage
Main Board Pr oblem
AC Off
AC ON
Connector CN6401
Connector CN6401
Connector CN6401
no
Check
STBY3.3V
PIN 5
Okay
Check
POWER_ON
PIN 9
Okay
Check
REG12V
PIN 13to18
Okay
No Voltage
No Voltage
No Voltage
PSU broken*
Replace PSU
Main Board Pr oblem
PSU broken*
Replace PSU
Okay
Check +Out2
and +Out3 at
CN6801
Okay
PSU OK
Connector
No Voltage
Output
Name
PSU broken*
Replace PSU
Input/output
Voltage
CN6401 STBY3.3V 3.35~3.55V 5
CN6401
POWER_
ON
2.6~3.55V 9
CN6401 REG12V 12.2~13.2V 13~18
CN6401 BL_ON 2.6~3.55V 7
CN6801 +OUT2/3 85.5~125.3V 2~3
*If PSU board replaced, pl ease proceed with PSU
standalone check
PIN
TV Business Division
18
18
GL71 Brok en PSU standalone checking
1. Appearance check
2. PS U info checking and confirmation
3. Broken parts checking
Note: PSU board C AN NOT be repair(unless requested by design)
Any request to repair will be instruct.
TV Business Division
19
19
Appearance check
No Operation Tool Remarks
1 Check A-side appearance Glove Visual check
Keep record PC/Pen/Photo
2 Check B-side appearance Glove Visual check
Keep record PC/Pen/Photo
1 2
Criteria: No abnormality
Exam ple: PWB crack/Burn mark
PWB crack
A-side
TV Business Division
B-side
Burn mark at AC inlet PIN(L~N)
20
20
PSU info checking and confirmation
No. Operation Tool Remarks
1 Check label marking Glove Visual check
Keep record PC/Pen/Photo
2 Record PN/SN/MFG Date Glove Visual check
Keep record PC/Pen/Photo
1
2
TV Business Division
PSU name
PSU PN(Part Number)
PSU SN(Serial Number)
MFG Date(Manufacturing date)
21
21
Broken parts checking
No. Parts Checking Criteria
1 F6101(Fuse) Resistance NG (high impedance)
2 C800A(main cap) Visual NG (vent)
3 BD1(Bridge di ode) Resistance NG (low impedance)
4 Q800A(PFC MOSFET) Resistance NG (low impedance)
5 D800A(PFC diode) Resistance NG (low impedance)
6 Q600(LLC MOSFET) Resistance NG (low impedance)
7 Q601(LLC MOSFET) Resistance NG (low impedance)
8 D120A(LLC Rectifier for 12V) Resistance NG (low impedance)
9 D120B(LLC Rectifier for 12V) Resistance NG (low impedance)
10 Q750A(LED boost MOSFET) Resistance NG (low impedance)
11 D751A(LED boost diode) Resistance NG (low impedance)
12 D 750(LLC Rectifier for LED) Resistance NG (low impedance)
13 D 751(LLC Rectifier for LED) Resistance NG (low impedance)
14 D 752(LLC Rectifier for LED) Resistance NG (low impedance)
15 D 753(LLC Rectifier for LED) Resistance NG (low impedance)
16 R915(Aux Fusible resistor) Resistance NG (high impedance)
17 D950A(Aux Rectifier diode) Resistance NG (low impedance)
18 Q 123( Tcon12V switch M O SFE T) Resistance NG (low impedance)
TV Business Division
22
22
Broken parts checking(parts location)
Q750A
BD1
F6101
C800A
D800A
R915
Q600
Q601
Q800A
D751A
D751
D750
D753
D752
Q123
D120A
D120B
D950A
23
23
Escalation Check sheet(Hardware)
Defect symptom Details
Does problem occur during first turn on?
Frequency of the symptom
Does the symptom recover by AC Off for more than 5
minutes?
Please describe the recover method
Please provide the humidity and temperature
condition of the defect area/ Wheater During
Problem Occur
Symptom occur for 1 particular set?
Able to duplicate the symptom in workshop
Other comment/Information
Any LED blink indication
Are there any other equipment or devices broken
together?
Is there any burn mark could be notice on the
defective board?
Symptom occur on all input modes
(HDMI, Video, Analogue RF, Digital RF)
Any other devices connected to TV set
If yes, please provide the device and brand
Yes: No:
Always: Intermittently:
(if any)
Yes: No:
Yes: No:
Yes: ____times No:
Yes: No:
Yes: No:
Temperature:
Yes: No:
Yes: ____parts No:
Yes: No:
____⁰C Humidity: ____H
(Specify)
(Specify)
TV Business Division
24
24
1.1 No power - LD board
START
LD board
1. Check fuse impedance
F1001
Is < 1ohm?
yes
2. Check impedance
D1001 to GND
Is > 1kohm?
yes
3. Check MOSFET
Q1007
Is > 1kohm?
yes
4. Check MOSFET
Q1002
Is > 1kohm?
yes
5. Check MOSFET
Q1008
no
no
no
no
no
Fuse F1001 broken
Diode D1001 broken
MOSFET Q1007 Broken
MOSFET Q1002 Broken
MOSFET Q1008 Broken
2
Q1007
4
1
F1001
D1001
3
Q1002
5
Is > 1kohm?
yes
Check B board
TV Business Division
Q1008
25
25
1.1 No power - LD board
12V DDCON check
START
Check fuse F1000
Is < 1ohm
yes
Check Input to GND
Is > 1k ohm?
yes
Check Input to Output
Is > 1k ohm?
yes
Check Output to GND
Is > 1k ohm?
yes
Check 12V
C1016 voltage
Is voltage <12V?
yes
Check EN POWER_ON
R1003 voltage
Is voltage >2.5V?
yes
Check Vcc
C1009 voltage
Is voltage >5.0V?
no
no
no
no
no
no
≥ 12V
Fuse F1000 broken
DDC IC1000 broken
DDC IC1000 broken
DDC IC1000 broken
Check B-Board
Troubleshooting flow 1.2
IC1000 broken
12V_TCON check
yes
Check 12.5V_TCON
Is voltage > 12.0V?
Check TCON_ON
Is voltage > 3.0V?
Check MOSFET
no
no
C1024
yes
no
Q1006
Is > 1kohm?
yes
12V power OK
Check other troubleshooting flow
END
Main device failure
Q1006 broken
yes
Check point on PWB refer next slide
26
26
1.1 No power - LD board
Input to GND
Impedance check
F1000
C102
4
+12.5V_TCO
N
Q1006
Input to Output
Impedance check
TV Business Division
C1016
R1003
C1009
Impedance check
Output to GND
Impedance check
27
27
1.2 No Power u-com Failure
BFX Board
G-Board or LD
G-Board or LD
or IC409
+3.3V_STBY
POWER_ON
BL_ON
P-on u-com control signal path summary
#pin1
Vdd Ucom
supply voltage
#pin18
IC401
#pin19
B-Board
#pin2
#pin12
#pin5
#pin10
#pin16
#pin11
#pin9
P-on u-com
#pin13
#pin14
OPWRSB
ORESETB
AC_OFF_INFO
PANEL_PWR_ON
X_SYSTEM_RST
P_ON_VBUS
PGOOD_1
P_ON_#1
P_ON_#2
SOC Muffin 2 (IC1000)
Tuner (CN2800)
DDC: +5.0V_VBUS (IC402)
DDC : +1.0V_M2 (IC604)
DDCs : +1.8V_TU (IC405)
DDCs : +5V_MAIN (IC404), +3.3V_MAIN
(Q406/Q407)
LDOs: +1.05V_M2_A_1 (IC603),
+12V_REG
R430
R437
GND
#pin7
MAIN_VCC
ADC port
#pin3
#pin15
#pin8
+1.05V_M2_A_2 (IC606), VCC3IO_EMMC
(IC2002)
DC_OFF_DET
DC_OFF_DET (IC400)
P_ON_LNB
+12V_LNB (Q408/Q409)
BL_MUTE
SOC Muffin 2 (IC1000)
28
1.2 No Power u-com Failure
START
Check VDD
C419 Voltage.
Is the voltage >3.0V?
yes
Check DC_OFF_DET
C504 Voltage.
Is the voltage >3.0V?
yes
Check OPWRSB
R441 Voltage.
Is the voltage 0V?
yes
no
no
no
BFX Board
Check +3.3V_STBY
C413, CN400 #24pin
Check DC_OFF_DET
IC400
SOC
Muffin 2
problem
Check MAIN_VCC
R437 Voltage.
Is the voltage >1.6V?
yes
Check P_ON_VBUS
P-on ucom #pin11
is >3.0V?
yes
Check P_ON_#1
P-on ucom #pin13
is >3.0V?
yes
no
no
no
Check +12V_MAIN Line
(G board, LD).
Change IC401
Change IC401
Check POWER_ON
P-on ucom #pin19
Is the voltage >3.0V?
yes
Check P_ON_LNB
P-on ucom #pin15
Is the voltage >3.0V?
yes
no
no
Try AC Off and On after few minutes.
If #pin19 keep Low, change IC401.
If #pin19 goes High few seconds and downs to Low,
Check +12V_MAIN Line (G board, LD).
Change IC401
Check PGOOD_1
R434 Voltage.
Is the voltage >3.0V?
Continue next page…
no
1.3 No POWER - DDCON/LDO
Check 1.0V DDCON (IC604)
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29
1.2 No Power u-com Failure
BFX Board
Cont…
yes
Check P_ON_#2
P-on ucom #pin14
Is the voltage >3.0V?
yes
Check ORESETB
P-on ucom #pin12
Is the voltage >3.0V?
yes
no
Change IC401
no
Change IC401
Check X_SYSTEM_RST
P-on ucom #pin16
Is the voltage >3.0V?
yes
If BL_MUTE (R435) is 0V
Check BL_ON
P-on ucom #pin18
Is the voltage >3.0V?
yes
no
no
Change IC401
Change IC401
END
Ucom IC401 is working OK
30
30
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