Sony KDE-55XBR950 (serv.man2) Service Manual ▷ View online
-13-
3.3.2 Function of X-SUS Board
(1) DC/DC power supply block
Vs (+85V) Æ Vw (+190V) / Vx (+40V) / Vu (+35V) / Vq (-40V)
Vcc (+5V) Æ Vex (+16V) / XFve (+18V, floating)
(2) X switching block
Switching during address period
Switching during sustain period
Switching during reset period
(3) Current detector block
Isx (sustain) current detection
Ia (address) current detection
(4) Voltage detector block
Vs (sustain) voltage detection
Va (address) voltage detection
3.3.3 Function of Y-SUS Board
(1) DC/DC power supply block
Vcc (+5V) Æ Vey (+16V) / YFve (+18V, floating)
(2) Y Switching block
Switching during address period
Switching during sustain period
Switching during reset period
(3) Current detector block
Isy (sustain) current detection
-14-
3.4 PROTECTION FUNCTION
State of protection operation
(√:State change、
、
、
、
There is no change at the blank.)
Reactivation
condition when
abnormal content
is excluded
Abnormality part
State
Vw,
Vx
Vs
Va
Vex
Vey Vcc
Vpr
Va
ux
ux
AC
Re-turn
ing on
Overvoltage Stop(no
latch)
√
√
√
√
√
√
√
Vw
Overcurrent Delay
Latch
√
√
√
√
√
√
√
Yes
Overvoltage Stop(no
latch)
√
√
√
√
√
√
√
Yes
Vx
Overcurrent Delay
Latch
√
√
√
√
√
√
√
Yes
Overvoltage Latch
√
√
√
√
√
√
√
Yes
Low voltage
Latch
√
√
√
√
√
√
√
Yes
Vs
Overcurrent Delay
Latch
√
√
√
√
√
√
√
Yes
Overvoltage Latch
√
√
√
√
√
√
√
Yes
Low voltage
Latch
√
√
√
√
√
√
√
Yes
Va
Overcurrent Delay
Latch
√
√
√
√
√
√
√
Yes
Overvoltage Stop(no
latch) √
√
√
√
√
√
√
Yes
Vex
Vey
Overcurrent
Voltage
pendency(no
latch)
pendency(no
latch)
√
√
√
√
√
√
√
Yes
Overvoltage Latch
√
√
√
√
√
√
√
Yes
Vcc
Overcurrent Delay
Latch
√
√
√
√
√
√
√
Yes
Vpr2 Overcurrent Delay
Latch
√
√
√
√
√
√
√
√
√
Yes
-15-
4 PROBLEM ANALYSIS
4.1 OUTLINE OF REPAIR FLOW
Operation normal ?
PC board
unacceptable (NG) ?
Client claim
Product block/PDP module block
Locating cause of problem
Is PDP module block
Defective ?
Is the Panel defective ?
PC board replacement/Parts
replacement
Panel replacement/IC
module replacement
PC board
replacement/Parts
replacement
Processing to prevent
recurrence
Packing/Shipment
Recheck the problem description
Recheck problem
description
Installation in product
Product problem analysis/Repair
Return of repaired product
End of repair
N
Y
Heat run
Y
N
Product
manufacturer
(Repair center)
Repair center
Product
manufacturer
(Repair center)
Client
Client
N
Repair product
and Claim contents match
PDP module sent to factory
Operation normal ?
Repair product and
claim contents match
Is the panel faulty?
N
N
Y
N
Y
Product runs normally ?
Y
Y
Y
Y
N
N
Y
-16-
4.2 OUTLINE OF PDP MODULE REPAIR FLOW
Appearance check
Appearance unacceptable
(NG) ?
Repair of appearance
requested ?
Perform operation test
(Chapter 4.4).
Repair description and returned
product rechecked.
Yes
Does ID of
returned product agree with ID
of actual
Repair defective spots
Problem recurred ?
Receipt of returned product
(Chapter 4.3)
No
Yes
Yes
Yes
No
No
No
Check description of
repair request.
No
Contents match ?
Problem symptom
nonrecurrence analysis mode
Yes
Yes
2
1
3
5
4
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