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S/M NO. : DLT26H1001
Service Manual
LCD TV
CHASSIS : MT5331
Model : DLT-26H1
DLT-32H1
OCT. 2007
LCD TV Service Manual
Contents
Contents................................................................................................................................................................- 2 -
Service Manual ....................................................................................................................................................- 3 -
1. Precautions and notices..............................................................................................................................- 3 -
1.1 WARNING ......................................................................................................................................- 4 -
1.2 NOTES ............................................................................................................................................- 7 -
2. Product Function Specifications ..............................................................................................................- 10 -
2.1 Product Function............................................................................................................................- 10 -
2.2 Specifications.................................................................................................................................- 13 -
3. LCD Panel ...............................................................................................................................................- 15 -
3.1 DLT-26H1 ......................................................................................................................................- 15 -
3.2 DLT-32H1 ......................................................................................................................................- 18 -
4. Chassis Layout and Overall Wiring Diagrams ........................................................................................- 20 -
4.1 Chassis Layout...............................................................................................................................- 20 -
4.2 Overall Wiring Diagrams...............................................................................................................- 22 -
4.3 Photos of Boards............................................................................................................................- 24 -
5. Factory/Service OSD Menu.....................................................................................................................- 27 -
5.1 To enter the Factory OSD Menu ....................................................................................................- 27 -
5.2 Factory OSD Menu........................................................................................................................- 27 -
6. Software Upgrading.................................................................................................................................- 31 -
6.1 Get ready for upgrading.................................................................................................................- 31 -
6.2 Upgrading with the MtkTool .........................................................................................................- 33 -
7. Troubleshooting .......................................................................................................................................- 37 -
7.1 Troubleshooting for Remote Control .............................................................................................- 37 -
7.2 Troubleshooting for Function Key.................................................................................................- 38 -
7.3 TV won't Power On.......................................................................................................................- 39 -
7.4 Troubleshooting for Audio.............................................................................................................- 40 -
7.5 Troubleshooting for TV/VGA/HDMI input...................................................................................- 41 -
7.6 Troubleshooting for YPbPr input...................................................................................................- 42 -
7.7 Troubleshooting for Video/S-Video/SCART input ........................................................................- 43 -
7.8 Other problems ..............................................................................................................................- 44 -
8. Explode View...........................................................................................................................................- 45 -
9. Schematic circuit diagram .......................................................................................................................- 46 -
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LCD TV Service Manual
Service Manual
1. Precautions and notices
BEFORE SERVICING THE LCD TV, READ THE SAFETY PRECAUTIONS IN
THIS MANUAL.
WHEN REPLACEMENT PARTS ARE REQUIRED, BE SURE TO USE
REPLACEMENT PARTS SPECIFIED BY THE MANUFACTURER.
Proper service and repair is important to the safe, reliable operation of manufacture's
Equipment. The service procedures recommended by The manufacture and described
in this Service Guide are effective methods of performing service operations. Some
of these service operations require the use of tools specially designed for the purpose.
The special tools should be used when and as recommended.
It is important to note that this manual contains various CAUTIONS and NOTICES
which should be carefully read in order to minimize the risk of personal injury to
service personnel. The possibility exists that improper service methods may damage
the equipment. It is also important to understand that these CAUTIONS and
NOTICES ARE NOT EXHAUSTIVE. The manufacture could not possibly know,
evaluate and advise the service trade of all conceivable ways in which service might
be done or of the possible hazardous consequences of each way. Consequently, The
manufacture has not undertaken any such broad evaluation. Accordingly, a
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LCD TV Service Manual
serviceman that uses a service procedure or tools, which are not recommended by the
manufacture, must first satisfy himself thoroughly that neither his safety nor the safe
of the equipment will be jeopardized by the service method selected.
1.1 WARNING
1.1.1
Critical components having special safety characteristics are identified with a by
the Ref. No. in the parts list. Use of substitute replacement parts, which do not have
the same specified safety characteristics, may create shock, fire, or other hazards.
Under no circumstances should the original design be modified or altered without
written permission from the manufacture. The manufacture assumes no liability,
express or implied, arising out of any unauthorized modification of design.
Serviceman assumes all liability.
DANGERCAUTION CAUTION
TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY
ORIGINAL MANUFACTURER'S REPLACEMENT PARTS, WHICH ARE LISTED WITH
THEIR PART NUMBERS IN THE PARTS LIST SECTION OF THIS SERVICE GUIDE.
1.1.2.
All ICs and many other semiconductors are susceptible to electrostatic discharges
(ESD). Careless handling during repair can reduce life drastically. When repairing,
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make sure that you are connected with the same potential as the mass of the set by a
wristband with resistance. Keep components and tools also at this same potential.
1. Never replace modules or other components while the unit is switched on.
2. When making settings, use plastic rather than metal tools. This will prevent
any short circuits and the danger of a circuit becoming unstable.
1.1.3
To prevent electrical shock, do not use this polarized ac plug with an extension cord,
receptacle, or the outlet unless the blades can be fully inserted to prevent blade
exposure.
To prevent electrical shock, match wide blade or plug to wide slot, fully insert.
1.1.4
When replacement parts are required, be sure to use replacement parts specified by
the manufacturer or have the same characteristics as the original part. Unauthorized
substitutions may result in fire, electric shock, or other hazards.
1.1.5
Safety regulations require that after a repair the set must be returned in its original
condition. In particular attention should be paid to the following points.
-Note: The wire trees should be routed correctly and fixed with the mounted
cable clamps.
-The insulation of the mains lead should be checked for external damage.
1.1.6
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(1) Do not touch Signal and Power Connector while this product operates. Do not
touch EMI ground part and Heat Sink of Film Filter.
(2) Do not supply a voltage higher than that specified to this product. This may
damage the product and may cause a fire.
(3) Do not use this product in locations where the humidity is extremely high,
where it may be splashed with water, or where flammable materials surround it. Do
not install or use the product in a location that does no satisfy the specified
environmental conditions. This may damage the product and may cause a fire.
(4) If a foreign substance (such as water, metal, or liquid) gets inside the panel
module, immediately turn off the power. Continuing to use the product may cause
fire or electric shock.
(5) If the product emits smoke, and abnormal smell, or makes an abnormal sound,
immediately turn off the power. Continuing to use the product, it may cause fire or
electric shock.
(6) Do not disconnect or connect the connector while power to the product is on. It
takes some time for the voltage to drop to a sufficiently low level after the power
has been turned off. Confirm that the voltage has dropped to a safe level before
disconnecting or connecting the connector.
(7) Do not pull out or insert the power cable from/to an outlet with wet hands. It
may cause electric shock.
(8) Do not damage or modify the power cable. It may cause fire or electric shock.
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(9) If the power cable is damaged, or if the connector is loose, do not use the
product: otherwise, this can lead to fire or electric shock.
(10) If the power connector or the connector of the power cable becomes dirty or
dusty, wipe it with a dry cloth. Otherwise, this can lead to fire.
(11) Use only with the cart, stand, tripod, bracket, or table specified by the
manufacturer, or sold with the apparatus. When a cart is used, use caution when
moving the cart/apparatus combination to avoid injury from tip-over.
1.2 NOTES
Notes on Safe Handling of the LCD panel and during service
The work procedures shown with the Note indication are important for ensuring the
safety of the product and the servicing work. Be sure to follow these instructions.