LG / GOLDSTAR ML-027C CHASSIS
Instrukcja Serwisowa

TROUBLESHOOTING
1. General Features
No. 1 Symptom No screen Cause Input error of inverter connector P804 and 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.