Brand:
LG
Category: Monitor
Document Type: Parts/Service
Language: EN
Parts/Service for L1753S
Uploaded: Nov. 21, 2025, 7:49 p.m.
Manual Publish Date: 2007-01-23
Warranty Information
Refer to safety precautions for warranty information.
- Follow safety precautions before servicing.
- Handle LCD modules with care to avoid ESD damage.
- Use appropriate tools and techniques for disassembly and component replacement.
- Refer to timing charts for signal specifications.
- Troubleshoot issues using provided flowcharts and waveforms.
- Adjust settings via the Service OSD menu.
Troubleshooting and error codes
| Section | Problem | Possible Cause | Solution |
|---|---|---|---|
| 1. NO POWER | POWER INDICATOR OFF | Short point on power board | Check power board, find short point by opening each power line. |
| 3.3V line issue | Check 3.3V line (open check). | ||
| Key control connector routine | Check key control connector routine. | ||
| U201 issue | Check U201. | ||
| 2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS | NO RASTER (OSD IS NOT DISPLAYED) | Power board issue | Check power board, find short point by opening each power line. |
| MICOM INV ON/OFF port | Check MICOM INV ON/OFF port. | ||
| Brightness OSD control state | Confirm brightness OSD control state. | ||
| MICOM DIM-ADJ port | Check MICOM DIM-ADJ port. | ||
| CCFL Lamp | Replace CCFL lamp in the LCD module. | ||
| 3. NO RASTER (OSD IS NOT DISPLAYED) – MSTAR | NO RASTER (OSD IS NOT DISPLAYED) | U301 issue | Check U301. |
| Soldering condition of C210, C211 | Check C210, C211 soldering condition. | ||
| X201 issue | Check X201. | ||
| Trouble in U201 | Trouble in U201. | ||
| Connection line from D-SUB to U201 | Check connection line from D-SUB to U201. | ||
| Cable or LCD module issue | Trouble in cable or LCD module. | ||
| 4. TROUBLE IN DPM | DPM issue | PC not going into DPM OFF mode | Check PC is not going into DPM OFF mode. |
| H/V SYNC line | Check H/V SYNC line. | ||
| U201 issue | Trouble in U201. | ||
| 5. POWER | NO POWER (POWER INDICATOR OFF) | Fuse F101 issue | Trouble in Fuse (F101). |
| BD101 issue | Check BD101. | ||
| U101 Pin7 issue | Check U101 Pin7: 9~10V. | ||
| D102 issue | Check D102. | ||
| Q101 issue | Trouble in Q101. | ||
| D201, D202 issue | Trouble in D201, D202. | ||
| 5V, 12V line issue | Check 5V, 12V Line. | ||
| 6. Raster | Lamp Off | Scaler Output (Main Board) issue | Check Scaler Output (Main Board). |
| Q301, Q302 issue | Check Q301, Q302. | ||
| Waveform of U301 | Check the waveform of U301 Pin11, 12, 19, 20. | ||
| Q303~Q308 or U303, U304 issue | Check Q303~Q308 Or Trouble in U303, U304. |