Hitachi 26ld8000ta Service Manual

							SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT. 
LCD Television
July  2005   Digital Media Division
YKNo.019E
SERVICE MANUAL 26LD8000TA
Be sure to read this manual before servicing. To ensure safety from fi
 re, electric shock, injury, harmful radiation 
and materials, various measures are provided in this LCD TV.  Be sure to read cautionary items described in 
the manual before servicing.  These servicing instructions are for use by qualifi  ed service personnel only. To 
reduce the risk of electric shock, do not perform any servicing other than that described in the operating 
instructions unless you are qualifi  ed to do so. 
Caution 
1. Features -------------------------------------------------- 3
2. Specifi cations -------------------------------------------- 4
3. Component names ------------------------------------- 5
4. Service point --------------------------------------------- 7
5. Adjustment ----------------------------------------------- 8
6. Troubleshooting --------------------------------------- 16
7. Self-diagnosis function ------------------------------ 21 8. Block diagram ----------------------------------------- 23
9. Wiring diagram ---------------------------------------- 25
10. 
Circuit diagram ---------------------------------------- 26
11. Printed wiring board diagram ---------------------- 42
12.  Disassembly diagram  -------------------------------- 46
13.  Replacement parts list  ------------------------------- 48
Contents 
1. Replacement work should be started after the Panel Module and the AC/DC Power supply have become 
suffi ciently cool. 
2. Special care should be taken when working near the display area in or\
der not to damage its surface. 
3. The Panel Module should not be touched with bare hands in order to prote\
ct its surface from blemishes  and damage. 
4. It is recommended that you use clean soft gloves during the replaceme\
nt work in order to protect not only  the display area of the Panel Module but also yourself. 
Service Warning   
 
						

							 
 
2
CAUTION FOR SAFETY 
 
Please read this page before repair the TV. 
The following safety precautions are designed to help you stay safe and prevent accidents during the repair 
work. 
z Please take note of these cautionary flags. 
 
Warning This means Potential to sustain injury or even death. 
 
Caution This means Potential to sustain breakage or irreparable damage. 
 
z Also note these cautionary icons 
 
This means CAUTION 
 
This means MUST 
 
This means POTENTIAL ELECTRIC 
SHOCK 
 This means DO NOT 
 
 
						

							 
 
3
 
 
 
 WARNING 
„ Follow instructions. „ Must use same types of wires and components.
 
The cabinet, chassis, and labels are parts 
that require attention. You must follow the 
caution notes and safety instructions 
presented throughout this User Manual to 
prevent damage to them or injury to 
yourself. 
 
„ Prevent electric shock. 
 
The TV uses special tubes and tapes 
made from insulated materials. Moreover, 
some materials are kept from making 
contact with the PWB for the sake of 
safety.Internal leads are kept from hot 
parts or high voltage parts by means of 
clamps or other measures. As such, you 
must restored these parts to their original 
conditions in order to prevent electric 
shock or fire. 
 
„ Perform safety check when done. 
 
Exercise caution while working on the 
device as the TV contains high voltage 
parts and   
 
 
 
 
 
 
  supply.It is possible to sustain severe 
injury or death if you accidentally touch 
the wrong parts.You must disconnect the 
power supply while servicing, 
reassembling, or change parts. If you 
touch a live connection it is possible to 
sustain severe injury or death. 
 
„ Use recommended components. 
 
Every part (such as removed screws, 
components, and wiring) must be 
restored to their prior conditions after 
servicing.Be sure to check everything that 
was repaired for damage or mistakes. 
Also measure the insulated impedance 
with a meg-ohm meter to confirm that the 
impedance value is more than 4M ohm.If 
the impedance value is less than 4M 
ohm, then electric shock or fire may 
result. 
 
 
 
 
Use only the recommended components 
or componentst that structurally identical 
to the originals. This is to ensure safety 
and reliability. Pay special attention to 
parts in the parts list and circuit diagrams 
marked with 
  . If you use 
non-recommended components, then 
electric shock or fire may result. 
 
						

							 
 
4  
PRECAUTIONS 
z Cleaning the TV’s LCD screen panel   
Before cleaning the TV, turn it off and disconnect the power plug from the power outlet. To prevent scratching 
or damaging of the LCD screen face, do not knock or rub the surface with sharp or hard objects. Clean the 
screen with a soft cloth moistened with warm water and dry with a second soft cloth. If it is not enough, then 
use a cloth with mild detergent. Do not use harsh or abrasive cleaners.   
 
z Cleaning the TVs cabinet 
Use a soft cloth to clean the TVs cabinet and control panel. When excessively soiled, dilute a neutral 
detergent in water, wet and wring out the soft cloth in it, gently clean the cabinet, and then wipe it down with a 
dry soft cloth. 
Never use acid/alkaline detergents, alcoholic detergents, abrasive cleaners, powder soaps, OA cleaners, car 
wax, glass cleaners, and so on. They will cause discoloration, scratches or cracks. 
 
1. Features 
z Enhanced definition LCD display panel 
The 26-inch color LCD display panel, with a resolution of 1366 (H) x 768(V) pixels, creates a widescreen 
picture. This panel features a thin form factor and can be hung on a wall with an optional wall mounting kit. 
 
z High Performance Digital Processor 
This panel displays a wide range of personal computer signals from 640 x 480, 800 x 600 SVGA to 1280 x 
768 WXGA.(RGB Analog input). 
 
z Easy-to-use remote control and on-screen display system 
The included remote control operates all TV functions. Futhermore, the on-screen display system shows 
the status of the control settings in an easy-to-view fashion. 
 
z Power saving system 
When connected to a VESA DPMS-compliant PC, the TV cuts its power consumption while idle. 
 
						

							 
 
5
2. Specifications 
Display 
dimensions Approx. 26.005nches (604 (H) x 323 (V) mm, diagonal 600.53mm) 
Panel 
Resolution  1366 (H) x 768 (V) pixels 
Net dimensions  661.9 (W) x 522.5 (H) x 266.9(D) mm        (With Base) 
Net weight    18 kg (With Base) 
Temperatur  Operating: 0°C to 40°C, Storage: -15°C to 50°C Ambient 
conditions 
Relative umidity  Operating: 20% to 80%, Storage: 20% to 90% (non-condensing) 
Power supply  AC100 - 240V, 50/60Hz 
Power consumption/at standby  
						

							 
 
6
3..Component names 
¾ [Main unit] 
Control panel 
z An Adjustment buttons are located on the top of 
the control panel 
z Indications for each buttons function can be found 
on the inside of the control panel cover. 
 
 
 
 
1. SUB-POWER  4. VOL X 7.MENU 
2. PROGRAM S 
4. RIGHTX 7.ENTER 
2. UP S 5. VOL W  
3. PROGRAM T 
5. LEFT W  
3. DOWN T 6. INPUT  Normal Button Action 
  
6.EXIT            Button Action when MENU engaged
 
 
 
The main power switch is located at the right 
side of the back. 
 
						

							 
 
7 
¾ [Remote Control]  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
						

							 
 
8
4.Service points   
z Lead-free solder   
This product uses lead-free solder (unleaded) to help protect the environment. Please read these instructions 
before attempting any soldering work.   
 
Caution: Always wear safety glasses to prevent fumes or molten solder from getting into   
the eyes. Lead-free solder can splatter at high temperatures (600℃).  
 
„ Lead-free solder indicator   
Printed circuit boards using lead-free solder are engraved with an 
 label. 
 
„ Properties of lead-free solder   
The melting point of lead-free solder is 40-50℃  higher than leaded solder.   
 
„ Servicing solder   
Solder with an alloy composition of Sn-3.0Ag-0.5Cu or Sn-0.7Cu is recommended. Although servicing with 
leaded solder is possible, there are a few precautions that have to be taken. (Not taking these precautions 
may cause the solder to not harden properly, and lead to consequent malfunctions.)   
 
Precautions when using leaded solder  
z Remove    all lead-free solder from soldered joints when replacing components.   
z If leaded solder should be added to existing lead free joints, mix in the leaded solder thoroughly after the 
lead-free solder has been completely melted (do not apply the soldering iron without solder).   
 
„ Servicing soldering iron   
A soldering iron with a temperature setting capability (temperature control function) is recommended.   
The melting point of lead-free solder is higher than leaded solder. Use a soldering iron that maintains a high 
stable temperature (large heat capacity), and that allows temperature adjustment according to the part being 
serviced, to avoid poor servicing performance.   
 
Recommended soldering iron:  
z Soldering iron with temperature control function (temperature range: 320-450℃)  
 
Recommended temperature range per part:   
Part  Soldering iron temperature 
Mounting (chips) on mounted PCB 320℃±30℃ 
Mounting (chips) on empty PCB 380℃±30℃ 
Chassis, metallic shield, etc. 420℃±30℃ 
 
(1) IR PWB, KEY PWB, SW PWB,2* I/O PWB   
(2) MAIN PWB   
(3) POWER BOARD   
 
 The PWB assembly which has used lead free solder 
 
						

							 
 
9
5.Adjustment 
5.1 SERVICE (FACTORY) MODE ACCESS 
This model has a Factory Mode, where the technician can access and adjust some of the color temperature 
settings. The Factory Mode has several different appearances, depending on the input signal. 
 
 
 
Picture Setting   
for Factory Model NTSC   
Table1  TV 
Table2  AV (composite)/SV(S-Video) 
Table3  SV(S-video) 
Table4  480i(component) 
Table5  480p(component) 
Table6  1080i/60(component) 
Table7  720P/60(component) 
 
Picture Setting   
for Factory Model PAL 
Table1  TV 
Table2  AV (composite)/SV(S-Video) 
Table3  SV(S-video) 
Table4  576i(component) 
Table5  576p(component) 
Table6  1080i/50(component) 
Table7  720P/50(component) 
 
 
 
 
 
Preliminary
 
1.  To access the Factory Mode, the TV must be 
running. 
 
Procedure
 
2.  Press and hold the #3 and #4 button (PROGRAM 
T and VOLUMES).       ①         ② 
3.  While continuing to hold the #3 and #4 button, press and hold the #1 button (SUB-POWER). 
4.  After both buttons have been held down for five (5) seconds, first release the #1 button, then release the 
#3 and #4 button. 
5.  As stated previously, the input that the TV had selected at the time will determine which actual FACTORY 
MODE display will show up. (See next page) 
 
 
						

							 
 
10
 
 
 
z FACTORY MODE NAVIGATION 
To navigate through the different menu items, use the 
S or T button on the remote control. The menu items 
will be high-lighted green as navigation occurs. To access a particular adjustment parameter, use the 
“ENTER” button on the remote control, which will cause a new menu to appear. To back up from the 
FACTORY MODE, use the RETURN or EXIT button on the remote control. To leave the FACTORY MODE, 
press POWER button on the remote control. 
 
 
ENTER