SONY KV-HF21M80 SERVICE MODE POWER LED BLINKING AND CIRCUIT DIAGRAM

SONY KV-HF21M80 SERVICE MODE POWER LED BLINKING AND CIRCUIT DIAGRAM

SONY KV-HF21M80 

CRT TV  

SERVICE MODE POWER LED BLINKING AND CIRCUIT DIAGRAM 

DIAGNOSTIC TEST INDICATORS
When an errors occurs, the STANDBY/TIMER lamp will flash a set 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.

Diagnostic Item Description	No. of times STANDBY/TIMER lamp flashes	Detected Symptoms
# Power does no turn on	Does not light	# Power does not come on. # No power is supplied to the TV. # AC power supply is faulty.
# +B overcurrent(OCP) or overvoltage (OVP) # Vertical deflect stopped # Horizontal deflection  overdrive	2 times	# Power does not come on. # Load on power line is shorted. # Has entered standby state after horizontal raster. # Vertical deflection pulse is stopped.
# White balance failure (no PICTURE)	5 times —	# Power line is shorted or power supply is stopped. # No raster is generated. # CRT cathode current detection reference pulse output is small.
# Micro reset		# Power is shut down shortly, after this return back to normal. # Detect Micro latch up.

Note 1: If a + B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously. The symptom that is diagnosed first by the microcontroller is displayed on the screen.
Note 2: Refer to screen (G2) Adjustment in section 3-4 of this manual.

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.

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 occurances 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

HANDLING OF SELF-DIAGNOSTIC SCREEN DISPLAY
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 CIRCUIT

+B overcurrent OCP :- Occurs when an overcurrent on the +B(135) line is detected by Q604. If Q604 go to ON and the voltage to pin 18 of IC301 should go down when V.SYNC is more than seven verticals in a period, the unit will automatically turn off.

Vertical deflection stopped:- Occurs when an absence of the vertical deflection pulse is detected by Q509 and IC001 shut down the power supply.

Vertical deflection overcurrent :-  Occurs when an overcurrent on V drive line is detected by Q507. Power supply will be shut down when detect this by IC001.

White balance failure:- If the RGB levels do not balance or become low level within 5 seconds, this error will be detected by IC301. TV will stay on, but there will be no picture.

 (Refers to the RGB levels of the AKB detection Ref pulse that detects IK.)

ENTERING SERVICE MODE

With the unit on standby
PRESS  [DISPLAY] > 5  > VOL (+)  > [POWER] IN SEQUENCE 
This operation sequence puts the unit into service mode

METHOD OF CANCELLATION FROM SERVICE MODE
Set the standby condition (Press[POWER] button on the commander), then press [POWER] button again, hereupon it becomes TV mode.
METHOD OF WRITE INTO MEMORY
1) Set to Service Mode.
2) Press [1] (UP) and [4] (DOWN), select an item of adjustment.
3) Press [MUTING] button and it will indicate WRITE on the screen.
4) Press [0] button to write into memory.
MEMORY WRITE CONFIRMATION METHOD
1) After adjustment, pull out the plug from AC outlet, and then plug into AC outlet again.
2) Turn the power switch ON and set to Service Mode.
3) Call the adjusted items again to confirm adjustments were made.

7, 0 All the data becomes the values in memory.

8, 0 All user control goes to the standard state.

5, 0 Service data initialization (Be sure not to use usually.)

2, 0 Write 50Hz adjustment data to 60Hz, or vice versa.

ADJUSTMENT METHOD
Item Number 00 of device GEO
This explanation uses H-Position as an example.
1. Select “GEO 00 HPS” with the 1 and 4 buttons.
2. Raise/lower the data with the 3 and 6 buttons.
3. Select the optimum state. (The standard is 1F for PAL reception.)
4. Write with the [MUTING] button. (The display changes to WRITE.)
5. Execute the writing with the 0 button. (The WRITE display will be changed to red color while excuting, and back to SERVICE.)

Use the same method for all Items. Use 1 and 4 to select th adjustment item, use 3 and 6 to adjust, write with [MUTING], then execute the write with 0.

Note : 1. In[WRITE], the data for all items are written into memory together.
2. For adjustment items that have different standard data between 50Hz or 60Hz, be sure to use the respective input signal after adjustment.

A BOARD ADJUSTMENT AFTER IC003 (MEMORY) REPLACEMENT
When replacing IC003 (MEMORY), be sure to change IC001 (µ- COM) to the following new IC at the same time. IC001(µ-CON):CXP86449-616S (KV-HF21M60/HF21P50) CXP86449-623S (KV-HF21M80)
1. Enter to Service Mode.
2. Press commander buttons 5 and 0 (Data Initialize), and 2 and 0 (Data Copy) to initialize the data.
3. Call each item number and check if the respective screen shows the normal picture.
In cases where items are not well adjusted, rectify the items with fine adjustment.
Write the data per each item number ([MUTING] + 0).
4. Select item numbers “OPB0” (OP1), “OPB1” (OP2) and “OPB2” (OP3) and respectively set the bit per model with command buttons 3 and 6.
5. Press commander buttons 8 and - (Test Normal) to return to the data that was set on the shipment from the factory. (This will also cancel Service Mode.)

CIRCUIT DIAGRAM 

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