Hitachi 26ld8000ta Service Manual

							 
 
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7.Self Diagnosis Function 
If a problem arises while you are using the TV, please read this self diagram function guide carefully before you ask to 
have the TV repaired. You may be able to fix it easily by yourself. For example, if the mains plug is disconnected from the 
mains outlet, or the TV aerial has problems, you may think there is a problem with the TV itself. 
Important: 
z  This self diagram function guide only covers problems whose causes are not easy to decide. If you have a question 
when you are operating a function, read the page(s) for that function carefully, not this self diagram function guide. 
z  If you follow the advice in this self diagram function guide without any success, unplug the mains plug and ask your 
TV to be repaired. Do not attempt tp repair the TV by yourself or to remove the rear cover of the TV. 
If you cannot turn on the TV: 
z  Are the AC plug on the power cordfrom the TV is connected to AC outlet?   
Poor picture: 
z  If noise totally blocks out the picture , there may be a problem with the aerial or the aerial cable. Check the following 
to try to solve the problem: 
-  Have the TV and aerial been connected properly? 
-  Has the aerial cable been damaged? 
-  Is the aerial pointing in the right direction? 
-  Is the aerial itself faulty? 
z    If the TV or aerial suffers interface from other equipment, stripes or noise may appear in the picture. Move any   
equipment such as an amplifier, personal computer, or a hair drier, that can cause interference away from your TV.   
Or try moving the TV. If the aerial suffers interference from a ratio tower or high-voltage wire, please contact your 
local dealer. 
z  If the TV suffers interference from signals reflecting from mountains or buildings, double-pictures(ghosting) will 
occur. Try to change the aerial’s direction or replace it with one with better directionality. 
z  Have the COLOR and BRIGHT settings been adjusted properly?   
z  Videotaping teletext is not recommended because it may not record correctly. 
z  When viewing images from commercially available video software products, or videos from videotapes which have 
been recorded improperly, the top of the image may be distorted. This is due to the condition of the video signal. 
There is nothing wrong with the TV. 
Poor sound: 
z  Have you adjusted BASS or TREBLE properly? 
If the TV does not respond to the remote control: 
z  Have the batteries of the remote control worn out?   
z  Have you attempted to use the remote control from the sides or rear of the TVor from more than seven metersaway 
from the TV? Use the remote control in the front of your TV or from less than seven meters away. 
z  If the TV suddenly stops responding, disconnect the power cord of the TV from the AC outlet. Connect them to the 
AC outlet again to turn on the TV. If the TV returns to a normal state, it is not a failure. 
 
 
 
						

							 
 
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Other concerns: 
z  When the SLEEP TIMER function operates, the TV is auto matically turned off. If the TV suddenly turns off, try to 
press the standby button to turn on the TV once again. If the TV goes back to normal, there is no problem. 
z  It takes a short period of time from the time an operation such as changing channels is performed until an image is 
displayed. This is not a malfunction. This is the time required for the image to stabilize it can be displayed. 
z  The TV may make a crackling sound due to a sudden change in temperature. The picture or sound may be normal. 
If you hear crackling sounds frequently while you are viewing the TV, there may be other causes. As a precaution, 
ask your service technician to inspect it. 
z  The top of the TV and the screen may become hot during use but this has no effect on the performance of the TV. 
Ensure that the ventilation holes are not blocked. 
z  When the picture is unstable, the screen may become white for a moment. This occurs when the signal which drives 
the liquid crystal is missing. This is not a malfunction. 
z  When a still image has been displayed for a long period, a faint residual image may remain on the screen for a short 
time after the power has been turned off or when another image is displayed. This is not a malfunction and the 
image will eventually disappear. 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
						

							 
 
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8.Block Diagram 
¾ LCD-TV 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
						

							 
 
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9. Wiring Block Diagram 
 
 
 
 
 
						

							 
 
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10. Circuit Diagram 
¾  Main Board (PWB-0885) 
 
 
 
						

							 
 
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