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 )

Insert pr operl y wit hout slanti ng

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]

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] Temp. sensor I2C No ACK [TEMP_ERR]

4KBE Error (4KBE WDT) 4KPQ Error (4KPQ WDT)

Blue italic: detect at startup sequence only.

<G>: Power supply board, : Main board, <T>: T-con board, <LD>: LD board : 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

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, : Main board, <T>: T-con board, <LD>: LD board

(if AC adapter model, it would power supply for Set),

: 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)

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

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

no

Check

STBY3.3V

PIN 5

Okay

Check

POWER_ON

PIN 9

Okay

Check

REG12V

PIN 13to18

Okay

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

TV Business Division

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

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

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

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

Broken parts checking(parts location)

Q750A

BD1

F6101

C800A

D800A

R915

Q600

Q601

Q800A

D751A

D751

D750

D753

D752

Q123

D120A

D120B

D950A

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: ____times No:

Yes: No:

Temperature:

Yes: No:

Yes: ____parts No:

Yes: No:

____⁰C Humidity: ____H

(Specify)

TV Business Division

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

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

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

≥ 12V

Fuse F1000 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

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

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

1.2 No Power u-com Failure

BFX Board

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

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

Check +12V_MAIN Line

(G board, LD).

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

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)

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

Change IC401

END

Ucom IC401 is working OK

30