Brand:
LG
Category: Desktop Computer
Document Type: Manual
Language: EN
Manual for FLATRON F700B
Uploaded: Nov. 21, 2025, 6:59 p.m.
Manual Publish Date: 2002-05-01
The Front Control Panel includes the Power Button (1) to turn the monitor ON and OFF. The Power Indicator (2) shows green for normal operation and amber for Energy Saving (DPM) mode. The MENU (or OSD) Button (3) accesses the on-screen display. Arrow buttons (4) are used to navigate and adjust settings within the OSD. The SELECT (or SET) Button (5) confirms selections.
Key Operations:
- Power On/Off: Press the Power Button (1).
- Access Menu: Press the MENU (OSD) Button (3).
- Adjust Settings: Use the Arrow Buttons (4) to change values or move between options.
- Confirm Selection: Press the SELECT (SET) Button (5).
Contrast and Brightness can also be adjusted directly using dedicated buttons (indicated in the diagram as bringing up Contrast or Brightness adjustment).
Troubleshooting and error codes
| Problem | Possible Cause | Solution |
|---|---|---|
| NO POWER (POWER INDICATOR OFF) | CHECK FUSE OK? | TROUBLE IN FUSE (F901) |
| CHECK C908 VOLTAGE? (AC120V: 160VDC, AC220V: 304VDC) | TROUBLE IN D900 | |
| CHECK IC901 PIN 6 WAVEFORM? (SQUARE WAVE COMES OUT?) | TROUBLE IN IC901 | |
| CHECK D941, D942, D951, D961, D962, D971 VOLTAGE? | TROUBLE IN D941, D942, D951, D961, D962, D971 | |
| YES (Previous checks OK) | TROUBLE IN Q903, Q952, Q951, Q942, Q941 | |
| NO CHARACTER | CHECK IC302 PIN 9(5V)? | TROUBLE IN P302 5V LINE |
| CHECK IC302 PIN 5, 6, 7? | TROUBLE IN PC SIGNAL, P301 SIGNAL CABLE | |
| CHECK IC302 PIN 20, 19, 18? | TROUBLE IN IC302 | |
| CHECK IC303 PIN 4 (80V) PIN 8 (12V)? | TROUBLE IN P303 12V LINE/ 80V LINE | |
| CHECK IC303 PIN 1, 2, 3? | TROUBLE IN IC303 | |
| CHECK R, G, B CATHODE VOLTAGE? | TROUBLE IN R331~R333, L311~L313 D307~D312 | |
| YES (Previous checks OK) | TROUBLE IN CRT SOCKET | |
| NO VIDEO (POWER INDICATOR ON) | CHECK POWER INDICATOR GREEN or AMBER? | AMBER: DPM MODE (NO H and/or V SYNC) |
| GREEN, CHECK D712 ANODE (-157V)? | TROUBLE IN D712 | |
| YES, CHECK G1 VOLTAGE? (-55V~-150V) | TROUBLE IN Q799 | |
| YES, CHECK CDT HEAT VOLTAGE? (6.3V) | TROUBLE IN D941, Q942, Q941 | |
| YES (Previous checks OK) | TROUBLE IN CDT | |
| NO HORIZONTAL DEFLECTION (ONE VERTICAL LINE) | CHECK Q706? | TROUBLE IN Q706 |
| YES, CHECK B+ VOLTAGE (50V)? | TROUBLE IN 50V LINE | |
| YES, CHECK T701(FBT) PIN 2 (31KHZ 60V, 69KHZ 140V)? | TROUBLE IN Q719, Q720, D710 | |
| YES, CHECK Q701 COLLECTOR WAVEFORM? | TROUBLE IN Q701 | |
| YES (Previous checks OK) | TROUBLE IN T701, P701 | |
| UNBALANCED OF H-LIN. | CHECK IC401 PIN 5, 6, 7? | TROUBLE IN IC401 (MICOM) |
| YES, CHECK Q711~Q716? | TROUBLE IN Q711~Q716 | |
| YES, CHECK L703? | TROUBLE IN L703 | |
| YES (Previous checks OK) | TROUBLE IN C722, C723, C726, C729 | |
| NO VERTICAL DEFLECTION (ONE HORIZONTAL LINE) | CHECK IC601 PIN 3 (15V)? | TROUBLE IN R603 15V LINE |
| YES, CHECK IC601 PIN 7 (40V)? | TROUBLE IN HIGH-VOLTAGE OUT CIRCUIT(FBT), D721, R606 | |
| YES, CHECK IC701 PIN 12, 13? | TROUBLE IN IC701 | |
| YES (Previous checks OK) | TROUBLE IN IC601, V-CIRCUIT | |
| NO OSD (ENTER BUTTON MUST BE PRESSED.) | CHECK IC301 B+ (5V)? | TROUBLE IN 5V LINE |
| YES, CHECK IC301 PIN 5, 10 WAVEFORM? | TROUBLE IN IC601 PIN8 (V-FBP), T701 40V LINE (H-FBP) | |
| YES, CHECK IC301 PIN 12 WAVEFORM? | TROUBLE IN IC302, IC301 | |
| YES, CHECK IC301 PIN 13, 14, 15? | TROUBLE IN IC301, IC302 | |
| YES (Previous checks OK) | TROUBLE IN OSD PERIPHERAL CIRCUIT | |
| OFF MODE FAILURE (NO OFF MODE.) | CHECK IC401 (MICOM) PIN 31, 32 (H/V INPUT) SIGNAL? | INPUT H/V SYNC SIGNAL |
| YES, H/V SYNC, CHECK IC401 PIN 13 WAVEFORM? | TROUBLE IN X401 | |
| YES, CHECK IC401 (MICOM) PIN 2, 3? | TROUBLE IN IC401 (MICOM) | |
| YES, SEE DPM TABLE, CHECK B+ LINE (6.3V,15V, 80V)? | TROUBLE IN Q941, Q942, Q951, Q952, | |
| YES (Previous checks OK) | TROUBLE IN PC | |
| NO DEGAUSSING (DEGAUSS ON THE OSD MENU MUST BE PRESSED.) | CHECK IC401 PIN 19 (OV)? | TROUBLE IN IC401 (MICOM) |
| YES, CHECK Q953 COLLECTOR VOLTAGE? (DC 15V) | TROUBLE IN Q953 | |
| YES, CHECK P902? | TROUBLE IN P902 | |
| YES, CHECK RL901? | TROUBLE IN RL901 | |
| YES (Previous checks OK) | TROUBLE IN TH901, DEGAUSSING COIL | |
| NO TILT (NO ROTATION) | CHECK IC401 PIN21 WAVE FORM? | TROUBLE IN IC401 (MICOM) |
| YES, CHECK 15V LINE AND 6.3V LINE? | TROUBLE IN 15V LINE, 6.3V LINE | |
| YES, CHECK Q503 EMITTER VOLTAGE? | TROUBLE IN Q501~Q503 | |
| YES (Previous checks OK) | TROUBLE IN P501, TILT COIL, D501 |