4. Analysis
During fixing my 7th screen, I made some analysis for diagnosis purpose. It should be quite helpful so I'm sharing them here.
I created these when trying to understand the circuit. Major traces were mapped out and might be helpful for repairs.
I'm sorry that I can't append the original PSD file since it's over 100MB.
These two files are lined up so you can overlay them over each other and toggle the layer for continuity.
- IC1: MN5814 TFT AV Panel Controller IC, TQFP048
- IC3: WiseView LTS5QTB Controller, QFP-48
- IC4: ICS673M-01 PLL Building Block, SOIC-16
- IC5: V393 Dual Comparator (square wave oscillator), TSSOP-14
- IC6: STM M24C04-W 4Kb Serial I2C Bus EEPROM, TSSOP8
- IC7: LM4835 Stereo 2W Audio Power Amplifier with DC Volume Control & Selectable Gain, TSSOP
- IC8: OZ970G Intelligent CCFL Inverter Controller, SOP
- IC9: NJM2284 2-Input, 3-Channel Video Switch, SSOP-16
- IC10: LM1881M Sync Separator, SOIC-8
- IC11: 5410CR 4-Channel 30MHz Rail to Rail Output OP Amp, TSSOP-14
- IC12: AN2526NFH LCD TV Signal Processor IC, QFP064
- IC14: 74VHC4066 4-Channel Analog Switch, TSSOP
- PS1, PS2: 2.0A SMD
- LCD Screen: LTS500Q1-GF1
After power is applied, IC3 attempts to read settings from IC6 via the serial bus.
If something goes wrong, IC3 will attempt to reinitialize IC6. If this fails, the system will become stuck in a loop. The screen will be stuck in an inverted state with no color or backlight, while sound will not be played.
