SELF DIAGNOSTIC TEST INDICATORS
- When an error occurs, the STANDBY/STEREO 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. Due to a hardware upgrade, there is no LED flashing in sets using Ver.1.0 system micros. This has been addressed in Ver.2.0 system micros.
- Results for all of the following diagnostic items are displayed on screen. No error has occurred if the screen displays a “0”.
Diagnostic
Item/Description
|
No. of times
STANDBY/STEREO
LED flashes
|
Self-diagnostic
Display/
Diagnostic result
|
Probable fault Location
|
Detected Symptoms
|
Power does not turn on
|
Does not light
|
* Power cord is not plugged in.
* Fuse is burned out. (F5501)
|
* Power does not come on.
* No power is supplied to the TV.
|
|
+B overcurrent (OCP)
|
2 times
|
2:0 or 2:1
|
* H.OUT (Q5030) is shorted. (D board)
* +B PWM (Q5003) is shorted. (D board)
*IC9001,IC9002, IC9003 is shorted. (C board)
|
* Power does not come on.
* Load on power line is shorted.
|
Low B overvoltage (OVP)
|
3 times
|
3:0 or 3:1
|
* IC6505 is faulty. (D Board)
|
* Has entered standby mode.
|
Vertical deflection stopped
|
4 times
|
4:0 or 4:1
|
* +/-15V is not supplied. (D board)
* IC 5004 is faulty. (D board
|
* Has entered standby state after
horizontal raster.
* Vertical deflection pulse is stopped.
* Power line is shorted or power
supply is stopped.
|
White balance failure
(not balanced)
|
5 times
|
5:0 or 5:1
|
* Video OUT (IC9001-IC9003) is faulty. (C
board)
* CRT Drive (IC201) is faulty. (A Board)
* G2 is improperly adjusted.
|
* No raster is generated.
* CRT cathode current detection
reference pulse output is small
|
- One flash count is not used for self-diagnostic.
- Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY/STEREO LED from flashing.
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 on the screen for confirmation.
To Bring Up Screen Test
- In standby mode, press buttons on the Remote Commander sequentially, in rapid succession, as shown below:
- Display à Channel 5 à Sound volume (-) à Power ON { Note that this differs from entering the service mode (sound 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 when the diagnostic screen is displayed, as shown below:
- Channel 8 à ENTER
Quitting the 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 CIRCUIT
- +B over current (OCP) à Occurs when an over current (more than 6A) on the +B (135V) line is detected by R6598/R6591. It will cause Q6520 to turn on and force the AC relay to turn off through Q6532 and Q6530.
- +B over voltage (OVP) à Occurs when 1) over voltage (more than +140V) on the +B (135V) line is detected by IC6505 or 2) an over voltage (more than 7.5V) on the unreg 7V line is detected by D6014. The AC Relay will turn off through Q6532 and Q6530.
- Vertical Deflection Stopped à Occurs when an absence of the vertical deflection pulse is detected by IC201. Power supply will shut down when waveform interval exceeds 2 seconds.
- White Balance Failure à If the RGB levels do not balance within 2 seconds after the power is turned on, this error will be detected by IC201. The unit will stay on, but there will be no picture. Low B Error Occurs when set 5V is out.
- Horizontal Deflection Stopped à Occurs when either 1) a +B over current is detected (IC5007) or 2) overheating is detected (Thermistor TH5002).
