Sony KV-DR29M93 - RM-991 Hong Kong – Flat Trinitron Color TV – LED blinking codes – Reset – SMPS and Deflection circuit diagram
Color system PAL, PAL 60, SECAM, NTSC3.58, NTSC4.43Television system B/G, I, D/K, M
SELF
DIAGNOSTIC FUNCTION
The
units have a self-diagnostic function. If an error occurs, the STANDBY/TIMER
lamp will automatically begin to flash.
The number of times the lamp flashes translates to a probable source of the problem. A definition of the STANDBY/TIMER lamp 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.
The number of times the lamp flashes translates to a probable source of the problem. A definition of the STANDBY/TIMER lamp 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.
DIAGNOSTIC
TEST INDICATORS
When an error occurs, the STANDBY/TIMER lamp will flash a number of times to indicate the possible cause of the problem. If there is more than one error, the lamp will identify the first of the problem areas.
Result for all of the following diagnostic items are displayed on screen. No error has occurred if the screen displays a “0”.
When an error occurs, the STANDBY/TIMER lamp will flash a number of times to indicate the possible cause of the problem. If there is more than one error, the lamp will identify the first of the problem areas.
Result for all of the following diagnostic items are displayed on screen. No error has occurred if the screen displays a “0”.
STANDBY/TIMER
LIGHT FLASH COUNT
+B
overcurrent 2 times
+B overvoltage 3 times
V deflection stop 4 times
White balance failure 5 times
Horizontal Deflection Failure 6 times.
+B overvoltage 3 times
V deflection stop 4 times
White balance failure 5 times
Horizontal Deflection Failure 6 times.
[One
flash count is not used for self-diagnostic.]
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.
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.
SELF-DIAGNOSTIC
SCREEN DISPLAY
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes off” 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:
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes off” 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:
Screen
display => channel [5] => Sound volume [-] => Power ON. [Note that this differs from entering the
service mode (mode volume [+])]
Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen during repairs. When you have completed the repairs, clear the result display to “0”.
Unless the result display is cleared to “0”, the self-diagnostic function will not be able to detect subsequent faults after completion of the repairs.
Clearing the result display
To clear the result display to “0”, press buttons on the remote commander sequentially as shown below when the diagnostic screen is being displayed.
Channel [8] > 0
Quitting Self-diagnostic screen
To quit the entire self-diagnostic screen, turn off the power switch on the remote commander or the main unit.
SELF-DIAGNOSTIC
+B overcurrent [OCP] => Occurs when an overcurrent on the +B(135) line is detected by Q6610 and Q6609. If Q6610 and Q6609 go to ON, the voltage to the pin3 of IC001 go to UP. The unit will automatically turn off.
+B overvoltage [OVP] => Occurs when an overvoltage on the +B(135) line is detected by D6635 and Q6611. If Q6611 go to ON, the voltage to pin6 of IC001 go to UP. The unit will automatically turn off.
Vertical deflection failure => Occurs when an absence of the vertical deflection pulse is detected by Q6819 and R6832. Shut down the power supply.
White balance failure => If the RGB levels do not balance or become low level within 5 seconds. This error will be detected by IC4301. TV will stay on, but there will be no picture.
High voltage protector of Horizontal Deflection => Occurs when an overvoltage of horizontal pulse is detected by D6809 and IC6801. If the voltage of anode D6830, Q6800 and D6825 goes to High, the voltage to pin34 of IC4301 go to UP. The unit will automatically turn off.
SMPS and Deflection - Circuit Diagram
Deflection control
Velocity Modulation
Click on the schematics to magnify
"RESET"
FUNCTION
There
are 2 ways to access to the "RESET" Function
a) By pressing "RESET" button on the Remote Commander.
b) By pressing "MENU" button on the Front Key Input and hold it down for 5 seconds.
a) By pressing "RESET" button on the Remote Commander.
b) By pressing "MENU" button on the Front Key Input and hold it down for 5 seconds.
Sequential
to the resetting operation (either methods being used in No. 2), TV set would
shut down once and automatically turn on again. The power-off duration is
expected to be about 500msec. An OSD message, "RESET" tentatively
will be displayed for 10 sec after IK status gets stable. As a result, some items will be reset to an
initial condition (shipment condition) whereas some other remains at the last
selection by user.
[An
electrolytic capacitor installed with the wrong polarity might explode.]
