JVC LT-37X688 Service Manual

(No.YA535)1-31
SECTION 5
TROUBLESHOOTING
5.1 SELF CHECK FEATURE
5.1.1 OUTLINE
This unit comes with the "Self check" feature, which checks the operational state of the circuit and displays/saves it during
failure.Diagnosis is performed when power is turned on, and information input to the main microcomputer is monitored at all time.
Diagnosis is displayed in 2 ways via screen display and LED flashes. Failure detection is based on input state of I
2
C bus and the
various control lines connected to the main microcomputer.
5.1.2 SELF CHECK MODE MENU FLOW CHART
Fig.5-1
5.1.3 HOW TO ENTER THE SELF CHECK MODE
Before entering the Self check Display mode, confirm that the setting of MODE SW of the REMOTE CONTROL UNIT is at the "TV"
side. If the switches have not been properly set, you cannot enter the Self check Display mode.
<SELF CHECK MODE(TV-MICRO)>
(1) Set to "0 minutes" using the [SLEEP] key.
(2) Press the [VIDEO STATUS] key and [DISPLAY] key
simultaneously, then enter the SERVICE MODE.
(3) Press the [1] key in the TV-MICRO SERVICE MODE.
(4) Press the [2] key in the SELF CHECK MODE(TV-MI-
CRO).
<SELF CHECK MODE(DIGITAL)>
(1) Set to "0 minutes" using the [SLEEP] key.
(2) Press the [VIDEO STATUS] key and [DISPLAY] key
simultaneously, then enter the service mode.
(3) Press the [3] key in the DIAGNOSTICS MODE.
(4) Press the [2] key in the SELF CHECK MODE(DIGITAL).
SERVICE MODE SCREEN
TV-MICRO SERVICE MODE SCREEN
Press [1] key Press [3] key
DIAGNOSTICS MODE SCREEN
Diagnostic
1. I2C Bus Stop
2. Self Check
3. Version
4. USB Device Log
SERVICE MENU
SERVICE MENU
1. TV-Micro Service
1. TV-Micro Service
2. Digital Service
2. Digital Service
3. Digital Diagnostics
3. Digital Diagnostics
4. Digital Engineering Functions
4. Digital Engineering Functions
SELF CHECK MODE(DIGITAL) SCREEN
Press [2] key Press [2] key
SELF CHECK MODE(TV-MICRO) SCREEN
Self Check -- DTM 1/1
BTSC Dec OK
Comp. ADC NG 2
NVM ECCErr Cnt 0x00000000
Repair Cnt 0x00000000
SVC2 ECCErr Cnt 0x00000000
Repair Cnt 0x00000000
Previous/Next Page [BACK]Back [MENU]Exit
Item
Failure history
Failure history
Item
CHECK
Normality=OK
Abnormality=NG
TV-Micro Service
TV-Micro Service
1. ADJUST
1. ADJUST
2. SELF CHECK
2. SELF CHECK
3. I2C STOP
3. I2C STOP
LOB 0 FAN 0
LOB 0 FAN 0
AUD 0
AUD 0
ANA 9 DIG 9
ANA 9 DIG 9
0000 0
0000 0
0
0

JVC LT-37X688 Specifications

General

Integrated clock	Yes
Comb filter	Digital
Display diagonal	37 \
Display brightness	500 cd/m²
Native aspect ratio	16:9
Viewing angle, horizontal	176 °
Analog signal format system	NTSC
HDCP	No
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
S-Video outputs quantity	1
Product color	Black
RMS rated power	20 W

Weight and Dimensions

Depth (without stand)	232 mm
Width (without stand)	927.1 mm
Height (without stand)	654.05 mm
Weight (without stand)	18280 g