DOWNLOAD Sony KDL-65W850A / KDL-65W855A Service Manual ↓ Size: 16.78 MB | Pages: 127 in PDF or view online for FREE

Model
KDL-65W850A KDL-65W855A
Pages
127
Size
16.78 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / COMMON
File
kdl-65w850a-kdl-65w855a.pdf
Date
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Sony KDL-65W850A / KDL-65W855A Service Manual ▷ View online

K board  Side A
IC4701
Pin 8
CN4702
Pin7
Pin6
Pin5
Pin4
IC4602
Pin4
Pin3
Pin2
Pin1
F4701
F4601
C4608
C4609
C4708
C4709
C4606
C4607
C4706
C4707
41
RB1G
CHASSIS
W850/855A
Troubleshooting
RB1G
CHASSIS
W850/855A
No
Checking Item
OK
NG
3-3-3. K Board Power Off Checking (for Main SP Lch & Rch)
4
Check connectivity audio output 
path 
(K board):
L4723(1) (near to IC side) –
CN4702 Pin1
Must have good connection 
(~0 Ω)
Open 
circuit.
CN4702 Pin1
L4723(2) (near to IC side) –
CN4702 Pin2
L4720(1) (near to IC side) –
CN4702 Pin3
L4720(2) (near to IC side) –
CN4702 Pin4
L4722(1) (near to IC side) –
CN4702 Pin5
L4722(2) (near to IC side) –
CN4702 Pin6
Must have good connection 
(~0 Ω)
Open 
circuit.
42
K board  Side A
Pin 8
Pin7
Pin6
L4722(1)
L4722(2)
CN4702
Pin5
Pin4
Pin3
Pin2
L4720(1)
L4720(2)
L4723(1)
Pin2
Pin1
L4723(2)
( )
L4723(1)
43
RB1G
CHASSIS
W850/855A
Troubleshooting
RB1G
CHASSIS
W850/855A
3-3-4. K Board Power On Checking (for Main SP Lch & Rch)
No
Checking Item
OK
NG
If  NG
If  NG
1
Check 
side-terminal of 
L4723,L4720,
L4722
Switching Freq = 384kHz or 
768KHz ±20KHz
Vrms = dont care
No switching frequency
at either one of the CL
Go to next checking.
(near to IC side) 
2
Check
F4601 / F4701 MainSP
V(before fuse) = 12.5V ±
0.5V
V(after fuse) = 12.5V ± 0.5 V
No voltage.
Check fuse broken?
Check CN4602 Pin 1 &2 got 
12.5V?
Change fuse (5A).
Check power supply 
board audio VCC.
44
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