Sony KP-FW51M91 Service Manual ▷ View online
– 5 –
KP-FW51M91
RM-1015
SECTION 1
SELF DIAGNOSIS FUNCTION
The unit in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER LED will automatically begin to
flash.
The number of times the LED flashes translates to a probable source of the problem. A definition of the STANDBY/TIMER LED flash
indicators is listed in the instruction manual for the user's knowledge and reference. If an error symptom cannot be reproduced, the remote
commander can be used to review the failure occurrence data stored in memory to reveal past problems and how often these problems
occur.
1-1. DIAGNOSTIC TEST INDICATORS
When an error occurs, the STANDBY/TIMER LED will flash a set number of times to indicate the possible cause of the problem. If there
is more than one error, the LED will identify the first of the problem areas.
Result for all of the following diagnostic items are displayed on screen. If the screen displays a “0”, no error has occurred .
• Power does not
turn on
• +B overcurrent
(OCP)
• +B overvoltage
(OVP)
• Vertical deflection
stopped
• White balance
failure
(not balanced)
(not balanced)
• LOW B down***
• Horizontal
deflection stopped
• Audio Protection
• Zero crossing
detector
• HV protection
• Power does not come on.
• No power is supplied to the PJ.
• AC power supply is faulty.
• No power is supplied to the PJ.
• AC power supply is faulty.
• Power does not come on.
• Load on power line is shorted.
• Load on power line is shorted.
• Has entered standby mode.
• Has entered standby mode after
horizontal raster.
• Vertical deflection pulse is
stopped.
• Power line is shorted or power.
• No raster is generated.
• CRT cathode current detection
• CRT cathode current detection
reference pulse output is small.
• No picture.
• No picture.
• No picture.
•No picture.
• No picture.
Item 2:1
or more than 1
Item 3:1
or more than 1
Item 4:1
or more than 1
Item 5:1
or more than 1
Item 6:1
or more than 1
Item 7:1
or more than 1
Item 8:1
or more than 1
Item 9:1
or more than 1
Item 10:1
or more than 1
No. of times
STANDBY/TIMER
LED flashes
Symptoms
Diagnostic
Item
Description
Self-diagnostic
display/
Diagnostic result
Probable Cause Location
Does not light
2 times
3 times
4 times
5 times
6 times
7 times
8 times
9 times
10 times
• Power cord is not plugged in.
• Fuse (F6000) is burned out.
• Fuse (F6000) is burned out.
(A board)
• H. OUT(Q5001) is shorted.
• +B PWM(Q5201) is shorted.
• +B PWM(Q5201) is shorted.
(D board)
• IC6503 is faulty. (D board)
• 15V is not supplied. (D board)
• IC5101 is faulty. (D baord)
• IC5101 is faulty. (D baord)
• Video
OUT(IC9101,IC9201,IC9301) is
faulty. (CR,CG,CB board)
faulty. (CR,CG,CB board)
• CRT drive (IC0401) is faulty. (MG
board)
• G2 is impropenrly adjustd.**
• +5V line is overloaded.
(A, BM, MG boards)
• +5V line is shorted.
(A, BM, MG boards)
• IC6201is faulty. (A board)
• Q5006 is broken. (D board)
• IC0401 is faulty. (MG board).
• IC0401 is faulty. (MG board).
• + or - 22V audio supply is not
present - Check PS2001 &
PS2000
PS2000
• D6166 or D6114 is open.
(A board)
• Q8014 or Q6013 have shorted
replace along with R8051 on D
board.
board.
• IC8005 is damaged. (D board)
*
If a +B overcurrent is detected, stoppage of the vertical detection is detected simultaneously. The symptom that is
diagnosed first by the microcontroller is displayed on the screen.
**
Refer to screen (G2) adjustment (fine adjustment) in section 2 of this manual.
***
Is STNDBY/TIMER LED flashes six (6) times, unplug the unit and wait 10 seconds before performing the sdjustment.
– 6 –
KP-FW51M91
RM-1015
1-2.
DISPLAY OF STANDBY/TIMER LIGHT FLASH COUNT
1-3. STOPPING THE STANDBY/TIMER FLASH
Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY/TIMER lamp from
flashing.
LED OFF 3 sec
LED ON 0.3 sec.
LED OFF 0.3 sec.
LED OFF 0.3 sec.
4 tims
5 tims
6 tims
7 tims
8 tims
9 tims
10 tims
HV protection
2 tims
3 tims
Audio protection
Zero crossing detector
Low +B OVP/OCP
Horiz. deflection stopped
Vert. deflection stopped
White balance failure
+B Overcurrent
Low +B Overvoltage
Flash count
Diagnostic items
* One flash counts is not used for silf-diagnostic.
STANDBY/TIMER
lamp
– 7 –
KP-FW51M91
RM-1015
1-4. SELF-DIAGNOSTIC SCREEN DISPLAY
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confirmed, it is possible to
bring up past occurrences of failure for confirmation on the screen:
[To Bring Up Screen Test]
In standby mode, press buttons on the remote commander sequentially in rapid succession as shown below:
Self-Diagnosis screen display
1-5. HANDLING OF SELF-DIAGNOSTIC SCREEN DISPLAY
5
(DIGIT 5)
(VOLUME –)
(POWER)
ON SCREEN
DISPLAY
( )
*
* : Note that this differs from entering the service mode (volume +)
Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen
After you have completed the repairs, clear the result display to “0”.
[Clearing the result display]
To clear the result display to “0”, press button on the remote commander sequentially as shown below when the diagnostic screen is being
displayed.
[Quitting Self-diagnostic screen]
To quit the entire self-diagnostic screen, turn off the power switch on the remote commander or the main unit.
Press “8” button
(It will indicate “CLEAR” on the screen.)
Press “-” button
(The “CLEAR” display change to red color.)
,
SELF DIAGNOSTIC
2 OCP
: 0
3 OVP
: 0
4 V STOP: 0
5 AKB
5 AKB
: 0
6 LOW-B : 0
7 H STOP : 0
8
8
A PRT : 1
9 Z DET : 0
10
10
HV PRT : 0
101 WDT : 0
102 WDT PF : 24
102 WDT PF : 24
Number "1 "
means a fault was detected one
means a fault was detected one
time only.
Number "0 "
means that no fault detected.
means that no fault detected.
– 8 –
KP-FW51M91
RM-1015
+B overcurrent (OCP)
Occurs when excessive current flows through R6812.
The increase in voltage across Q6803 causes it to turn on which sends a high
signal to the micro.
+B overvoltage (OVP)
IC6801 detects +B OVP condition and Q6802.
This sends a high signal to the micro and also shuts down the AC relay.
V-STOP
Occurs when an absence of the vertical deflection pulse is detected by pin 56 of
IC0404 (MG board).
Power supply will shut down when waveform interval exceeds 2 seconds.
White balance failure
If the RGB levels* do not balance within 2 seconds after the power is turned on,
this error will be detected by IC0401.
TV will stay on, but there will be no picture.
Low +B OCP/OVP
Occurs when set 5V is out.
Horizontal deflection stopped
Occurs when either :
1) a +B overcurrent is detected (Q6803), or
2) IC0401 (MG board) is damaged.
1-6. SELF-DIAGNOSTIC CIRCUIT
IC0001
MAIN MICRO
22 STBY-LED
5 OCP
6 OVP
53 SCL
52 SDA
AKB 24
CLKO 14
V PROT 56
87 LOW B ERR
33 HV PROT
AC RLY 36
DATO 13
HG PROT 57
2
1
3
1
< +15V
< +B OCP >
<IK PROT2>
<+B OCP>
<+B OVP>
2
3
1
< H PLS
Q6108
Q6102
Q6803
CRT
VDY-
+12V
Q5202
RY6000
<P_SW(-)
IC6201
+B >
IC8001
IC6801
+15V
<
Q6802
+B >
D6805
< +B
STBY-LED
Q6105
D6803
D6122
D6121
MG BOARD
A BOARD
D BOARD
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