SANYO DP50747 SERVICE MODE
SANYO DP50747
SERVICE MODE
ON-SCREEN SERVICE MENU SYSTEM
Enter the Service Menu:
Turn off the receiver and disconnect the AC power supply. Leave unplugged for at least one minute.
While pressing the Volume (–) button on the television, reconnect the AC power supply. The Service Menu will now appear. The remote can now be used to make adjustments.
Enter the Service Menu:
Turn off the receiver and disconnect the AC power supply. Leave unplugged for at least one minute.
While pressing the Volume (–) button on the television, reconnect the AC power supply. The Service Menu will now appear. The remote can now be used to make adjustments.
Service Adjustments:
Press the Channel ▲ or ▼ key to select the desired service menu item you want to adjust. for the On-screen Service Menu. Use the Volume + or – key to adjust the data. The + or – keys will increase or decrease the data sequentially.
Exit from the Service Menu:
Press the MENU key to turn off the Service Menu display.
Press the Channel ▲ or ▼ key to select the desired service menu item you want to adjust. for the On-screen Service Menu. Use the Volume + or – key to adjust the data. The + or – keys will increase or decrease the data sequentially.
Exit from the Service Menu:
Press the MENU key to turn off the Service Menu display.
POWER FAILURE CIRCUIT
This unit is equipped with a Power Failure
Detector function included in the CPU which checks for an abnormal condition in
the chassis power supplies. If, while the power is on, a failure is caused by any
of the following that results in a low voltage supply, the CPU will turn the
unit off in 1.5 seconds to prevent further damage:
Failure within the power supply circuits.
A short circuit in the load side from the supply.
1. Power Failure 1: Detected voltage failure for analog and digital circuits. (Connected to IC801 pin 32.)
2. Power Failure 2: Not used on this model. (Connected to IC801 pin 36.)
(Normal: High; Failure: Low)
If, while the power is off, the power is switched on and any of these failures remains uncorrected, the CPU will shut off the power within three seconds.
Failure within the power supply circuits.
A short circuit in the load side from the supply.
1. Power Failure 1: Detected voltage failure for analog and digital circuits. (Connected to IC801 pin 32.)
2. Power Failure 2: Not used on this model. (Connected to IC801 pin 36.)
(Normal: High; Failure: Low)
If, while the power is off, the power is switched on and any of these failures remains uncorrected, the CPU will shut off the power within three seconds.
Check the following
if the unit is turned off by the power failure detector.
1. Disconnect the AC power cord (120V AC line) for at least 10 seconds.
2. Connect a DC Voltmeter to the circuits shown below.
3. Press the Power key and check for the proper voltage supplies.
4. If any of these voltages is low, the power failure detector should turn the unit off within three seconds.
5. Check all circuits shown below.
Note: This unit is equipped with a Power Surge Protection feature included in the CPU. If power failure occurs three times within 15 minutes, the CPU will stop functioning automatically to help prevent secondary damage. (TV will not turn on by pressing the power key.) To reset the operating programs within the CPU, disconnect the AC power cord for at least 10 seconds.
1. Disconnect the AC power cord (120V AC line) for at least 10 seconds.
2. Connect a DC Voltmeter to the circuits shown below.
3. Press the Power key and check for the proper voltage supplies.
4. If any of these voltages is low, the power failure detector should turn the unit off within three seconds.
5. Check all circuits shown below.
Note: This unit is equipped with a Power Surge Protection feature included in the CPU. If power failure occurs three times within 15 minutes, the CPU will stop functioning automatically to help prevent secondary damage. (TV will not turn on by pressing the power key.) To reset the operating programs within the CPU, disconnect the AC power cord for at least 10 seconds.
ON-SCREEN SERVICE MENU
When IC802 (EEPROM) is replaced, check the bus data to confirm they are the same as below
When IC802 (EEPROM) is replaced, check the bus data to confirm they are the same as below
No.
|
Title
|
Initial
|
Note
|
086
|
VOL
|
Data
|
Volume setup inspection
|
087
|
OP1
|
30h
|
Option 1 Data
|
088
|
OP2
|
18h
|
Option 2 Data
|
101
|
1R00
|
14h
|
ROM Correction Data
|
102
|
1R02
|
00h
|
ROM Correction Data
|
197
|
2R47
|
00h
|
ROM Correction Data
|
198
|
2R48
|
00h
00h |
ROM Correction Data
|
PROGRAM CODES
The microprossesor used in this model is a multi-purpose type and is used in several different models. To ensure proper operation and the correct features for your particular model, the program codes must be correct.
Note 1. Option Data 1 (NO. 087 OPT) should be hexadecimal 18. See 087 above. If this program code is wrong the TV will not operate properly.
The microprossesor used in this model is a multi-purpose type and is used in several different models. To ensure proper operation and the correct features for your particular model, the program codes must be correct.
Note 1. Option Data 1 (NO. 087 OPT) should be hexadecimal 18. See 087 above. If this program code is wrong the TV will not operate properly.
Note 2. Option Data 2 (NO. 088
OP2) should be hexadecimal 14. See 088 above. If
this program code is wrong the TV will not operate properly.
