DOWNLOAD LG 26LH1DCX-UX / 26LH1DC3-UA / 26LH1DC4-UB / 26LH1DC5-UC Service Manual ↓ Size: 31.35 MB | Pages: 72 in PDF or view online for FREE

-41-

Component1
Component2

Input

Y/Cb/Cr
24 bit Digital signal

Y/Pb/Pr

Y
for Caption

IC706

Analog MUX

(Video switch)

I

2

C Comm.

IC705

Micro Processor

IC201

AD Converter

IC202

Video switch

LCD Panel

LVDS Signal

IC401

DTV Controller

IC701

SD Video Filter

P503

LVDS Connector

P201

RCA Jack

One of the component1 and 2 video signals received in P201 is selected by the video switch(IC202) and sent to
Analog to Digital converter(IC201).
The analog signal received in IC201 is converted to the digital signal and sent as output in 24 bit.
The digital signal of 24bit is received in DTV controller(IC401) and decoded to convert to LVDS signal and sent to
the LCD panel through LVDS connector.
Also because the caption information in the component signal received in IC202 is in Y signal, the Y signal is sent to
the analog video switch of IC706 to be sent to IC401 through IC107 and IC705.

-42-

Component1
Component2

Input

I

2

S

I

2

S

IEC958

IC401

DTV Controller

IC602

Audio Processor

IC601

Audio Switch

P601

RCA Jack

Speaker

Stereo(L/R)

IC708

Digital Audio Amp.

P501

SPDIF Output

Connector

P706, P707

Audio Output

Connector

The left/right audio signal of component1 and component2 is received in P601 and sent to the audio switch(IC601).
One stereo signal is selected among the received signals in the audio switch(IC601) and sent to the audio
process(IC602).
The stereo signal selected is converted to I

2

S format through the audio processor and sent to the DTV controller to

be sent as output in I

2

S format through the audio decoding process.

This signal is converted to stereo signal(L/R) by the digital audio amp(IC708) and sent to the internal speaker
through the audio output connector(P706, P707).
Also the digital audio data in IC401 is sent as output, PCM data, through P501 through SPDIF format.

-43-

RGB Signal Input

LCD Panel

I

2

C Comm.

LVDS Signal

24bit
Digital signal

R/G/B

IC303

NVRAM

(PC EDID)

IC401

DTV Controller

IC302

Scaler

P503

LVDS Connector

P301

D-sub 15 Connector

The RGB signal outputted from the PC is received through the D-sub 15 pin connector of P301.
The PC reads the EDID information of IC303 through I

2

C line and outputs the best resolution supported by this board.

When the EDID information is not recorded in NVRAM(IC303) or when the EDID information cannot be read due to
communications line issue, basic resolution provided in PC is sent out as output.
The analog RGB signal entered through IC302 is converted to AD through the scaler(IC302) and sent to IC401 as
24 bit digital signal.
(The 24 bit signal is composed is wired OR with the 24 bit component outputted by the IC201(AD converter).)
The 24 bit signal received in DTV controller(IC401) is decoded and converted to LVDS to be sent to LCD panel
through P503.

-44-

PC(DVI)

Input

I

2

S

I

2

S

IEC958

IC401

DTV Controller

IC602

Audio Processor

IC601

Audio Switch

P602

Phone Jack

Speaker

Stereo(L/R)

IC708

Digital Audio Amp.

P501

SPDIF Output

Connector

P706, P707

Audio Output

Connector

PC audio signal or DVI audio signal is received in P602 to be sent to the audio switch(IC601).
One stereo signal among the signal received by the audio switch(IC601) is selected and sent to the audio
process(IC602).
Selected stereo signal is converted to I

2

S format by audio processor to be sent to DTV controller and outputted in 

I

2

S format through audio decoding process.

This signal is converted to stereo signal(L/R) by digital audio amp(IC708) and sent to the internal speaker through
audio output connector(P706, P707).
Also the digital audio data in IC401 is outputted as PCM data in SPDIF format through P501.