Troubleshooting - JVC LT-26WX84 Service Manual

Lcd flat television

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Service manual (135 pages)

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User manual (64 pages)

Table of Contents

5.1

SELF-DIAGNOSIS FEATURE

5.1.1 OUTLINE

This unit comes with the "Self-diagnosis" 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

the various control lines connected to the main microcomputer.

5.1.2 HOW TO ENTER THE SELF-DIAGNOSIS DISPLAY MODE

Before entering the Self-diagnosis Display mode, confirm that

the setting of TV / CATV SW of the REMOTE CONTROL UNIT

is at the "TV" side and the setting of VCR / DVD SW is at the

"VCR" side. If the switches have not been properly set, you

cannot enter the Self-diagnosis Display mode.

(1) Press the [SLEEP TIMER] key and set it to 30 minutes.

(2) Press the [VIDEO STATUS] key and [DISPLY] key

simultaneously, then enter the TEST MODE.

(3) Press the [4] key (Self-diagnosis Display mode) before the

service mode screen disappears.

(4) Press the [MTS] key to enter Page 2 of the Self-diagnosis

Display mode.

*Use the [MTS] key to toggle between Page 1 and Page 2.

NOTE:

The remote control unit attached to this set does not

contain the [MTS] key. To perform the procedure (4), use

a remote control unit that contains the [MTS] key.

5.1.3 HOW TO EXIT THE SELF-DIAGNOSIS DISPLAY MODE

To Save Failure History:

Turn off the power by unplugging the AC power cord plug when

in the self-diagnosis display mode.

To Clear (Reset) Failure History:

Turn off the power by pressing the [POWER] key on the remote

control unit when in the self-diagnosis display mode.

5.1.4 FAILURE HISTORY

Failure history can be counted up to 9 times for each item.When

the number exceeds 9, display will remain as 9. Failure history

will be stored in the memory unless it has been deleted.

NOTE:

Only SYNC (with/without sync signals) will be neither counted

nor stored.

5.1.5 POINTS TO NOTE WHEN USING THE SELF-DIAGNOSIS

FEATURE

In addition to circuit failures (abnormal operation), the following

cases may also be iagnosed as "Abnormal" and displayed and

counted as "NG".

(1) Temporary defective transmissions across circuits due to

pulse interruptions

(2) Misalignment in the on/off timing of power for I

(VCC) when turning on/off the main power.

Diagnosis may be impeded if a large number of items are

displayed as "NG". As such, start self-diagnosis check only after

3 seconds in the case of receivers and 5 seconds in the case of

panels upon turning on the power. If recurrences are expected,

ensure to clear (reset) the failure history and record the new

diagnosis reults.

1-54 (No.YA089)

SECTION 5