Philips DVD763SA/021 manual Test Instruction Front Display and Audio/ Video Board, Supply Check

EN 40 5. DVD763SA Diagnostic Software, Trouble Shooting and Test Instructions

5.9Test Instruction Front Display and Audio/ Video Board

These test instruction is designed specifically for SACD 2002 single disc models which has the following outputs:

•6 Channel Audio output

•Coaxial / Optical digital output

•CVBS

•Component output YUV

•SVHS

•Double SCART output

•Front Display

5.9.1General

•All the waveforms measurement carried out in these test instruction will be base on the testpoint indicated in the A/V Board and Front Display schematic diagram in the Service manual.

•Impedance of the measuring-equipment should be > 1MΩ

•Most of the tests can be done using either the Diagnostic software “ Player script” which can be found in the chapter “Diagnostic Software description and troubleshooting” or the Menu interface using the Service PC with a terminal emulation program ( e.g. Window Hyperterminal ) where it is possible to control the execution of the Diagnostic Nuclei

•Setup for the measurement will be done in set level with all modules connected as shown in the Wiring Block diagram.

5.9.2General Start-Up Measurement

Supply Check:

Before starting the measurement,ensure that all power supply are connected to the A/V and Front Display board via conn.1420 and 1127 respectively.

Pin nr.	A/V Board	Front Display
Voltage	Conn. 1420	Conn. 1127
1	+3V3_Power	-
2	+3V3_Power	-
3	GND	-
4	+12V_Power	-
5	+12VSTBY	-
6	GND	+5VSTBY
7	+5VSTBY	+12V_Power
8	GND	-32V_Power
9	-12V_Power	-
10	GND	-
11	-32V_Power	-
12		-

Clock Check

Ensure the present of the clock to the DAC and the slave µP.

Clock Name	Testpoint	Frequency
PCM_CLK	I117	11.2896MHz ± 0.02% tolerance
XOUT	S1	8MHz ± 0.2% tolerance

Audio Mute Check

Measure the Audio mute voltage input at pin 22 of connector 1421

Status	Value
AudioMuteOn	HIGH (>3V)
AudioMuteOff	LOW (<3V)

To toggle between ON and OFF,use the following commands:

	Command
Ref.#	Name	Remarks
19a	AudioMuteOn	Audio Mute On
19b	AudioMuteOff	Audio Mute Off

5.9.3Audio DAC And Amplifier

Ensure that the Audio mute signal is OFF

To check the DAC and buffer amplifier,send the following commands.

Ref.#	Command Name	Remarks	Audio output
21a	AudioSineOn	Audio Sine	Sine,1Khz on
		signal ON	stereo
----	Press stop button	Audio Sine	No waveform
		signal OFF
20a	AudioPinkNoiseOn	Audio	Pink Noise on
		Pinknoise ON	6 channels
20b	AudioPinkNoiseOff	Audio	No waveform
		Pinknoise OFF

The audio signal ( sine or pink noise ) will also be present on the digital output ( SPDIF ).This can be checked by connecting digital signal to an amplifier with digital input.

Check the I2S and audio signal at the following testpoints:

Name	Testpoint
PCM_LRCLK	I115
PCM_SCLK	I116
PCM_CLK	I117
SDT1	I114
SDT2	I112
SDT3	I110
DIG_OUT	I499
STEREO L/R OUT	I330 / I333
FRONT L/R OUT	I336 / I339
SURROUND L/R OUT	I348 / I351
CENTRE OUT	I345
SUB WOOFER L/R OUT	I342

All waveforms can be refered to the A/V board schematic diagram.

5.9.4 Video Output And Buffer Amplifier

Check DC output-level at all video cinch output : 1.0V DC ± 10%

Generate a color bar using the following software commands:

Ref.#	Command Name	Remarks
23a	VideoColDencOn	Colour DENC ON
23b	VideoColDencOff	Colourbar DENC OFF

Check the video outputs at the following testpoints:

Name	Testpoint
GREEN_Y	I502
BLUE_U	I491
RED_V	I494
CVBS out_Mono	I480
C_Mono	I483
Y_Mono	I482

ll waveforms can be refered to the A/V board schematic diagram.

5.9.5Play and 16/9 Detection

Check DC voltage at S-VIDEO-CHROMA output (pin 4) with a 6k8 ohm load and SCART connector 1403 (pin 16) and change the SCART0 and SCART1 input using the following commands:

Ref.#	Command Name	Remarks
25a	VideoScartLo	Sends out 0V ± 0.5V
25b	VideoScartMi	Sends out 6V ± 10%