Monday, January 11, 2016

SANYO DP15647 Service mode and adjustments – LDC Television Repair and service

Category: LCD Television Repair and service 

Contents of this article 

  • How to access the service mode 
  • Service menu
  • Power failure circuit 



SANYO DP15647

This set has an On-screen Service Menu system included in
the CPU that allows remote operation for most of the service adjustments.
ON-SCREEN SERVICE MENU SYSTEM
Enter the Service Menu:
Turn off the receiver and disconnect the AC power supply.
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 UP or DOWN key to select the desired service menu item you want to adjust. See page 4 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.
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 00. 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 0C. See 088 above. If this program code is wrong the TV will not operate properly.
ON-SCREEN SERVICE MENU
When IC802 (EEPROM) is replaced, check the bus data to confirm they are the same as below. See page 3 for On-Screen Service Menu access and adjustments.
No.
Title
Initial Data
Note
086
VOL
30h
Volume setup inspection
087
OP1
00h
Option 1 Data
088
OP2
0Ch
Option 2 Data
101
1R00
00h
ROM Correction Data
102
1R02
00h
ROM Correction Data
197
2R47
00h
ROM Correction Data
198

2R48

00h

ROM Correction Data


POWER FAILURE CIRCUIT
This is unit is equipped with a Power Failure Detector function
included in the CPU which checks for an abnormal condition in the chassis power supplies, including the power
supply for the LVDS (LCD Panel).
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 digital circuits. (Connected to IC801 pin 36.)
2. Power Failure 2: Detected voltage failure for analog circuits. (Connected to IC801 pin 32.)
(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.
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