LG KZ-17LZ21 Service Manual - Page 14

LG KZ-17LZ21 Manual

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TROUBLESHOOTING 1. General Features No. 1 Symptom No screen Cause Input error of inverter connector P704 connector being slipped out Check Point 1) Bend the pin legs of P1 connector -> recheck them 2) Check and repair F804. 1) Check and fix P704 connector 2) Check and fix the components at P704 LCD module and at main board. 3) Check Pin21. Check and repair tuner board and main board 1) Replace the inverter 2) Replace the LCD lamp 2) Check the connector input. Cracked components and soldering at tuner board 2 Dark screen 1) Defective LCD lamp 2) Defective inverter 3) Input error of inverter connector 2. PC Mode No. 1 Symptom Screen noise Cause Clock or phase being not able to be adjusted. Check Point 1) Resettig is needed according to the video card of each PC. 2) Horizontal noise : adjust phase until no horizontal noise occurres. 3) Vertical noise : adjust clock in menu until no vertical noise occurres. 1) Play the Auto Configure in Menu. 2) Adjust horizontal and vertical position until the screen displayes normally. Recheck adn repair JA202,IC202 2 Screen position error Screen position error horizontally or vertically Soldering D-SUB Jack of JA202 and IC202. 3 Color beat noise 3. TV and external input No. 1 Symptom No sound - Speaker - Earphone Cause Defective Reset IC of IC604. Defective MSP3411 of IC601. Defective B+(8V,5V) of IC603. Check Point 1) Check volume and speaker. - Sound comes out only when being inputted into Audio L/R. 2) Check after replacing IC604. 3) Replace IC601. 4) Check and replace B+ of IC603. Check the mould of shield and SJ209, Replace shield case. Re-soldering 2 Video color beat noise Earphone shield case being touched. Soldering IC301 and IC510. 4 . DVD Mode No. 1 2 3 Symptom When the KEY of DVD is not working: When the LOGO screen can't display: When you can't insert the DVD title: When you can't see the screen: Check Point 1)Check the P801. 2)Check the 28PFFC cable. 3)Check the 8P power cable. 4 If you can't operate it after check the above status, replace the DVD DECK.

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1
No sound
Defective Reset IC of IC604.
1) Check volume and speaker.
- Speaker
Defective MSP3411 of IC601.
- Sound comes out only when being inputted into Audio
- Earphone
Defective B+(8V,5V) of IC603.
L/R.
2) Check after replacing IC604.
3) Replace IC601.
4) Check and replace B+ of IC603.
2
Video color beat noise
Earphone shield case being touched.
Check the mould of shield and SJ209, Replace shield case.
Soldering IC301 and IC510.
Re-soldering
1
No screen
Input error of inverter connector
1) Bend the pin legs of P1 connector -> recheck them
2) Check and repair F804.
P704 connector
1) Check and fix P704 connector
being slipped out
2) Check and fix the components at P704 LCD module
and at main board.
3) Check Pin21.
Cracked components and
Check and repair tuner board and main board
soldering at tuner board
2
Dark screen
1) Defective LCD lamp
1) Replace the inverter
2) Defective inverter
2) Replace the LCD lamp
3) Input error of inverter connector
2) Check the connector input.
TROUBLESHOOTING
1. General Features
2. PC Mode
No.
Symptom
Cause
Check Point
No.
Symptom
Cause
Check Point
Check Point
1
Screen noise
Clock or phase being
1) Resettig is needed according to the video card of each
not able to be adjusted.
PC.
2) Horizontal noise : adjust phase until no horizontal
noise occurres.
3) Vertical noise : adjust clock in menu until no vertical
noise occurres.
2
Screen position error
Screen position error
1) Play the Auto Configure in Menu.
horizontally or vertically
2) Adjust horizontal and vertical position until the screen
displayes normally.
3
Color beat noise
Soldering D-SUB Jack of JA202
Recheck adn repair JA202,IC202
and IC202.
3. TV and external input
No.
Symptom
Cause
4 . DVD Mode
1
When the KEY of DVD is not working:
1)Check the P801.
2
When the LOGO screen can’t display:
2)Check the 28PFFC cable.
3
When you can’t insert the DVD title:
3)Check the 8P power cable.
When you can’t see the screen:
4
If you can’t operate it after check the above status,
replace the DVD DECK.
No.
Symptom
Check Point