Service manual

MODEL: L423FR
Page 21
1-3. Video input circuit of HDMI
In HDMI input, it is inputted into IC400 of the signal processing IC via Following IC.
(I)IC500 : HDMI-Receiver IC ((SII9993CTG100 : SiliconImage)
It adopts a input of the interface standard called HDMI in this model. This can send both digital
image (video) and digital audio by the differential signal from one input, and this is already
beginning to be used for the output of DVD-PLAYER. It is convenient and high-quality methods
because all of signal process is digital. This pattern design and specification is severe in order to deal
with the signal of hundreds MHz, and it has to pass compliance testing of HDMI to receive
confirmation of this HDMI. This IC uses to receive and correspond the differential signal. This IC
corresponds not only HDMI input but also DVI input(TMDS interface) . Supported timing of this
input is 480P/1080i/720P.
The output format of this IC is YCbCr4:4:4, not RGB.
(J) IC501 : 2K-bit EEPROM (24LC22AT : Microchip)
This is the IC for E-EDID of HDMI.
This IC has important information about HDMI input such as audio, speaker, code for HDMI
Identification, in addition to product code, serial number, video specification, proposed timing, color
information.
1-4. Video input circuit of INPUT(Composite)
In INPUT input, it is inputted into IC400 of the signal processing IC via Following IC.
(K)IC5T1 : Buffer IC with LPF ( MM1566AF : Mitsumi)
This IC uses to mitigate the high frequency noise ingredient of the video signal outputted from
Composite-VIDEO(J601) and S-VIDEO(J605)
(L)IC5G0 : Digital decoder IC with 3D Y/C separation (uPC64011 : NEC)
It is IC which changes the analog video signal (S-VIDEO/Composite Video) from IC5T1 into a digital
signal.
By this IC, it has the function below besides digital conversion.
- 3 dimension Y/C separation for Composite Video
- Contrast adjustment.
- Brightness adjustment.
- FIELD signal generation.
- PLL (Phase-Locked Loop) : referential clock generation.
- Sync signal generation
This IC is controlled by register control of IC 5G0 via
3.3V IIC-bus3.3V IIC-bus
3.3V IIC-bus3.3V IIC-bus
3.3V IIC-bus .
1-5. Signal processor circuit
(M)IC400 : Signal processor IC ( gm1601 : Genesis)
By this IC, it has the function below.
- Scaling for all inputs.
- PIP/POP/PAP control for all inputs
- Auto setup for PC
- Frequency measurement / distinction for all inputs
- Color space conversion ( YPbPr
Æ RGB )
- Motion Adaptive De-Interlacer.(480i/1080i)
- Color / tint control the input signal except PC input.
- 3 dimension Noise reduction.
- Adaptive Film Mode (24Hz Æ 30Hz)
- Gamma correction
- Contrast and brightness adjustment for COMPONENT
- OSD mixing
This IC is controlled by register control of IC 400 via 5-lines serial communication.