DOWNLOAD Sony BDP-S790 Service Manual ↓ Size: 13.01 MB | Pages: 125 in PDF or view online for FREE

Main Flow ..............................................................................  9-2
Power (System) Flow ............................................................  9-3
Audio section flowchart .........................................................  9-4
Video section flowchart .........................................................  9-5 
FR-317 Board flowchart  ........................................................  9-5
TS-160 Board flowchart  ........................................................  9-5

Drive flowchart ......................................................................  9-8

Ethernet flowchart .................................................................  9-10

FAN flowchart .......................................................................  9-9

USB (Front) Device Flow ......................................................  9-12E
USB (Rear) Device Flow .......................................................  9-12E

Remote control does not operate .........................................  9-7

TS-161 Board flowchart ........................................................  9-6

WLAN flowchart ....................................................................  9-11

Power ON by power switch on front or remote

control.

Has system reset (CPU_XRST) been

cancelled?

 Measurement point JL1018

Start (and return from each flowchart)

Approximately 10 seconds after the AC is

applied, the WAIT display flashes several

times and the power is turned OFF

automatically.

Are the power supply voltages on the MB

board normal?

Replace the MB board.

Check the parts and mounting around X401.

Replace the MB board.

Is OPEN or CLOSE displayed on the

fluorescent tube?

Is there any problem in the FFC connection to

CN1270 which connects the drives?

Is XMB or the SETUP screen displayed on the

video output screen?

Do the  up, down, left, and right arrow keys of

the remote control permit operations on the

XMB?

Is the main clock (X401) oscillating properly at

27 MHz?

Is the sound reproduced properly when a BD,

DVD, or other disc is played?

Is the picture reproduced properly when a BD,

DVD, or other disc is played?

Are BD, DVD, or other discs that are loaded on

the drive recognized correctly?

Check the connections of the connectors.

If there is no improvement, replace the MB

board.

Pow

er (Sy

s

tem) Flow

AC

 I

N

C

heck

the

output

 v

olt

ages f

ro

m t

he pow

er 

s

upply

 block

.

C

N

301 pin

1

: +12V (U

N

SW

12V)

C

N

301 pin 2:

 +12V (U

N

SW

12V) 

C

N

301 pin 

3:

+12V (FE_U

N

SW12V)

No

Yes

Ch

e

ck th

e

 fu

se

s

H

av

e any

 of t

he below

 f

u

se

s

blow

n?

No

M

B

 board: PS301, 

PS302

Yes

Ch

e

c

k

th

e

 f

ollow

ing

pow

er cont

rol signals

w

hile

the

pow

er is ON

PCONT1#

: MB board

R

301

Yes

C

heck the v

o

lt

ages based

 on

th

e

s

chemati

c

diagram

- DCDC6V

- UNSW4V

- UNSW3.3V

- 3.3V

- 1.2V

- 1.5V

- FE_SW12V

- FE_SW5V

No

Vol

tage

 lines

that

 are not

 out

put

are shorted 

to

 G

N

D

No

Failure o

f po

w

er s

upply I

C

 ->

R

eplac

e

the

 I

C

R

eplac

e t

he MB board if

 t

here is no 

improvement 

C

hec

k

 t

hat

 t

he

harness

 has

been

ins

ert

ed 

properly.

 If

there

is

 no

problem

, replac

e t

he 

pow

er s

upply block

.

Re

plac

e bl

ow

n f

us

es

Replace the

 MB bo

ard if the

re

 is no 

improve

me

nt

Audi

o secti

on fl

ow

chart

Audi

o does not sound ri

ght

No

Vi

deo i

s output

properl

y

No

To Vi

deo secti

on fl

ow

chart

Y

es

Is t

he dri

ve operati

ng prop

erl

y?

No

To D

rive fl

ow

ch

art

Yes

Is each pow

er suppl

y supp

lied t

o t

he AU

DIO

Bl

ock?

No

T

o Pow

er Suppl

y (

S

ystem

) 

flow

chart

Yes

Onl

y 

A

nal

og 2ch L/R Audi

o affected?

N

o

Onl

y Di

gi

tal

 Audi

o (

HDM

I, 

 Coa

x)

affected?

No

Repl

ace the M

B

 board

Yes

Yes

Yes

Is there HDM

I output

?

No

Rep

lace the M

B board

Is there Coax

ia

lou

tput?

Is there

 audi

o sys

tem

 di

gi

tal

 si

gnal

 input to 

IC901?

IC901

pi

n1: A

RO_R

IC901

pi

n10:ALO_R

No

Repl

ace the M

B

 board

     Yes

Are control

 si

gnal

s i

nput to IC901?

 IC901pin7: MUTE

No

Repl

ace the M

B

 board

 Yes

Is

 there a prob

le

m

 w

ith m

ount

 cond

iti

on of

IC901

No

Repl

ace IC901 or rep

lace M

B

 boar

d

Check output resistor/capasitors

(R911,R918,C910,C918)

No

IC 305 Pin 5: SW3.3V