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generator) 
a) Assembly complete set; 
b) Enter factory menu, realize “PW1306 reset”, adjust background brightness to be 
maximum; 
c) Quit factory menu, enter D_SUB channel, input 60 HZ “pane 
signal”(C_Hat_16x12(W)),to VGA terminal. Thus the discrimination rate should be the 
best discrimination rate for the LCD screen, see table 1, enter user menu, adjust 
brightness to 50, contrast to 50 adjust line center, field and center to make the picture 
location to be correct.   

        d) Input “16 grades of grey degree” signal (Gray(H)-16), enter factory menu, realize 

AQC calibration” 
e)    Quit factory menu, input “8 grey degree” signal ( Gray(H)-8 ), enter user menu, 
adjust brightness and contrast, measure sixth degree with CA-210, make Y to 180 
cd/m

2

 , enter factory menu, ,fix green to be 50,adjust red, blue to make 

x=284,y=299.(This procedure may not be taken now) 

        f) Enter AV mode, input “8 grey degree” signal, adjust tint to 0, adjust brightness and 

contrast, measure sixth degree with CA-210, make Y to 180 cd/m

2

 , enter factory 

menu, ,fix green to be 50,adjust red, blue to make x=284,y=299. 
Notice: For the best discrimination rate of LCD screen, see table 1.

 

 

Table 1:LCD resolution of best 

Screen size 

Factory   

LCD resolution of best

 

Samsung 

AU 

Sanyo 

15” 

CPT  

1024x768 

Samsung  

17” 

AU 

1280x1024 

AU 800x600 

Chimei 

20” 

LG 

640x480 

 

 
3.  Functional Inspection 
3.1. ITV  connector 

Connect central signal source to RF connector. Enter the search menu--auto 

search, check if there is station skipping. Check semi-auto search, see if micro 
adjustment is normal, check output of earphone and speaker is normal, picture is 
normal. 
3.2  SCART/AV/S inut termianl 

Separately input signal of SCART/AV/S terminal, check picture and sound if they 

are normal. 
3.3  AUDIO OUT termianl/ VIDEO OUT terminal 

Summary of Contents for HLT-1751

Page 1: ...LCD TV HLT 1751 HLT 2051...

Page 2: ...fire or damage to the set 2 4 Never operate the set or do any installation work in bad environment such as wet bathroom laundry kitchen or nearby fire source heating equipment and devices or exposure...

Page 3: ...r storage 20 60 C humidity Scope for operation 20 85 Scope for storage 10 90 2 13 Display of a fixed picture for a long time may result in appearance of picture residue on the screen as commmonly call...

Page 4: ...board TV board on line Check main board Check TV board Combined test for general assembly Connect to central signal source check if various TV functions station skipping modulate quantity control etc...

Page 5: ...IF adjustment a Input DV 5V into TP2 input 12V to TP6 Input 5V to TP4 and input 0V to TP5 monitor voltage of TP3 input 38 9 MHz signal to TP1 and use a non inductance screw driver to adjust IFT L207 s...

Page 6: ...lue to make x 284 y 299 This procedure may not be taken now f Enter AV mode input 8 grey degree signal adjust tint to 0 adjust brightness and contrast measure sixth degree with CA 210 make Y to 180 cd...

Page 7: ...signal color bar multi wave group observe if the picture of the set is normal The normal screen should be AV1 change SCART signal to RGB format the normal screen should be AV1 RGB c Disconnect SCART s...

Page 8: ...signal receiving Maybe broadcast signal itself is not good Check if the outdoor antenna is disconnected Check if the antenna is correctly oriented Fringe in picture Check if the antenna is correctly o...

Page 9: ...e liquid crystal TV set and make proper adjustment according to the signal types Picture too bright and there is distortion in the brightest area Check if the contrast setting is too high Possibly the...

Page 10: ...may lead to incorrect display of the liquid crystal TVIn this case please press auto key on the remote control so as to enable the liquid crystal TV set to recheck the signal and then to display corr...

Page 11: ...receiver adopts CMO 20 1 inch LCD display screen as display unit It has PAL SECAM B G I D K L L color system receiving functions and at the same time with AV input S VHS input PC VGA connector and ear...

Page 12: ...n processor IC PW1306 PW1306 is a main processing IC built in type X86 CPU with outer memory 8M Flash N20 and controls the whole system The input signal from V port and G port is subject to internal a...

Page 13: ......

Page 14: ...Ground Ground Ground VCC CTL H IN1 L IN2 Red 1 input Green 1 input Blue 1 input Red 2 input Green 2 input Blue 2 input VD 1 input VD 2 input VD output Blue output Composite sync output Composite vide...

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Page 17: ...GPIO PWM IR Decoder A 19 1 D 15 0 CS 1 0 2 Wire Serial Microprocessor Bus Memory Out Bus Memory Buffer Processor Memory Interface Memory In Bus OSD VYUV 7 0 VCLK VPEN PW130 ImageProcessor Internal Blo...

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Page 21: ...ply L switch VCO 21 20 18 Loop filter 14 Offset comp optional 26 FPLL 0 90 VIF amp 6 7 8 15 VIF CAGC CBL Take over point SIF input switch CAGC 22 12 4 9 16 13 Standard switch 23 VS 17 CRef Intercarrie...

Page 22: ...V R L R Audio L S video HIGH VOLTAGE HIGH VOLTAGE MSP3420G...

Page 23: ...right size remains unchanged 3 Definition of dark spot It is identified as a dark spot if it is dark in the state of white field and its dark size remains unchanged 4 Definition of two neighboring poi...

Page 24: ...signal Check whether U1 pin 11 have output waveform Check N8 pin3 pin 5 s input signal Replace N8 Yes No Yes No No No Yes No No 23 Troubleshooting guide No raster Does the logo appear on the screen wh...

Page 25: ...B Hors Vers at X7 Check whether N1 has 5V power supply Check whether X9 pin 1 pin 2 have 5V power input Replace N2 Replace V105 V17 Replace N1 Measure N1 pin 33 pin 35 waveform Measure N1 pin 42 pin...

Page 26: ...HLT 1751...

Page 27: ...HLT 2051 01...

Page 28: ...HLT 2051 02...

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