BBK LT2619SU, LT2621SU Schematic

Service Manual
LT2619SU/LT2621SU
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.................................................................................................................................- 12 -
3. LCD Panel Spec.......................................................................................................................................- 13 -
3.1 General Description.......................................................................................................................- 13 -
3.2 General Features............................................................................................................................- 13 -
4. Chassis Layout and Overall Wiring Diagrams........................................................................................- 14 -
4.1 Chassis Layout...............................................................................................................................- 14 -
4.2 Wires and Cables Overall Wiring Diagrams .................................................................................- 15 -
5. Factory/Service OSD Menu and Adjustment...........................................................................................- 16 -
5.1 T o enter the Factory OSD Menu....................................................................................................- 16 -
5.2 Factory OSD Menu........................................................................................................................- 16 -
6. Software Upgrading.................................................................................................................................- 20 -
6.1 Get ready for upgrading.................................................................................................................- 20 -
6.2 Upgrading with the ISP_TOOL4.0.9.............................................................................................- 29 -
7. Troubleshooting.......................................................................................................................................- 34 -
7.1 Troubleshooting for Remote Control.............................................................................................- 34 -
7.2 Troubleshooting for Function Key.................................................................................................- 35 -
7.3 TV won’t Power On.......................................................................................................................- 36 -
7.4 Troubleshooting for Audio.............................................................................................................- 37 -
7.5 Troubleshooting for TV/VGA/HDMI input...................................................................................- 38 -
7.6 Troubleshooting for YPbPr input...................................................................................................- 39 -
7.7 Troubleshooting for Video/S-Video/ SCART input.......................................................................- 40 -
8. Explode View...........................................................................................................................................- 41 -
9. Schematic circuit diagram.......................................................................................................................- 41 -
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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.
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LCD TV Service Manual
not undertaken any such broad evaluation. Accordingly, a serviceman that uses a
service procedure or tools, which are not recommended by Hisense, 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
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.
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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,
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
LCD TV Service Manual
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
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cable clamps.
-The insulation of the mains lead should be checked for external damage.
1.1.6
(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
LCD TV Service Manual
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.
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(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.
(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
LCD TV Service Manual
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.
• Before starting the work, secure a sufficient working space.
• At all times other than when adjusting and checking the product, be sure to turn
OFF the POWER Button and disconnect the power cable from the power source of
the TV during servicing.
• To prevent electric shock and breakage of PC board, start the servicing work at least
30 seconds after the main power has been turned off. Especially when installing and
removing the power board, start servicing at least 2 minutes after the main power has
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been turned off.
• While the main power is on, do not touch any parts or circuits other than the ones
specified. If any connection other than the one specified is made between the
measuring equipment and the high voltage power supply block, it can result in
electric shock or activation of the leakage-detection circuit breaker.
• When installing the LCD module in, and removing it from the packing carton, be
sure to have at least two persons perform the work.
• When the surface of the panel comes into contact with the cushioning materials, be
sure to confirm that there is no foreign matter on top of the cushioning materials
LCD TV Service Manual
before the surface of the panel comes into contact with the cushioning materials.
Failure to observe this precaution may result in, the surface of the panel being
scratched by foreign matter.
• When handling the circuit board, be sure to remove static electricity from your body
before handling the circuit board.
• Be sure to handle the circuit board by holding the large parts as the heat sink or
transformer. Failure to observe this precaution may result in the occurrence of an
abnormality in the soldered areas.
• Do not stack the circuit boards. Failure to observe this precaution may result in
problems resulting from scratches on the parts, the deformation of parts, and
short-circuits due to residual electric charge.
• Routing of the wires and fixing them in position must be done in accordance with
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the original routing and fixing configuration when servicing is completed. All the
wires are routed far away from the areas that become hot (such as the heat sink).
These wires are fixed in position with the wire clamps so that the wires do not move,
thereby ensuring that they are not damaged and their materials do not deteriorate over
long periods of time. Therefore, route the cables and fix the cables to the original
position and states using the wire clamps.
• Perform a safety check when servicing is completed. Verify that the peripherals of
the serviced points have not undergone any deterioration during servicing. Also
verify that the screws, parts and cables removed for servicing purposes have all been
LCD TV Service Manual
returned to their proper locations in accordance with the original setup.
The lightning flash with arrowhead symbol, within an equilateral
triangle is intended to alert the user to the presence of uninsulated
dangerous voltage within the products enclosure that may be of sufficient magnitude
to constitute a risk of electric shock.
The exclamation point within an equilateral triangle is intended to
alert the user to the presence of important operating and maintenance
(servicing) instructions in the literature accompanying the set.
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2. Product Function Specifications
2.1 Product Function
LCD TV Service Manual
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LCD TV Service Manual
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2.2 Specifications
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LCD TV Service Manual
3. LCD Panel Spec
3.1 General Description
V260B1- L02 is a 25.5” TFT Liquid Crystal Display module with 8-CCFL Backlight unit and RSDS interface. This module supports 1366 x 768 WXGA format and can display 16.2M colors (6-bits+FRC colors).
3.2 General Features
Item Specification Unit
Active Area Bezel Opening Area 580.8 (H) x 328.8 (V) mm
Driver Element a-si TFT active matrix Pixel Number 1366 x R.G.B. x 768 pixel Pixel Pitch (Sub Pixel) 0.1405 (H) x 0.4215 (V) mm Pixel Arrangement RGB vertical stripe ­Display Colors 16.2M color Display Operation Mode
Surface Treatment Anti-Glare coating (Haze 25%) Hard coating (3H) -
575.769 (H) x 323.712 (V)
Transmissive mode / Normally White -
(26” diagonal) mm
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(2)
(6)
(4)
(3)
LCD TV Service Manual
4. Chassis Layout and Overall Wiring Diagrams
4.1 Chassis Layout
(1)
(5)
No Description Part No
(1) (2) (3) (4) (5) (6)
Main Board 117379 RSAG2.908.1395-1\ROH RSAG7.820.1529\VERCROH Power Board 115429 RSAG2.908.1251\ROH RSAG7.820.1235\VER.C\ROH RUSB Board TCON Board Keypad PCA IR&Led Board 116295
114583 115643 117301
Type/Model PCB/ Model
RSAG2.908.1189\ROH RSAG2.908.1268TP\ROH RSAG7.820.1330\VERC\ROH RSAG2.908.1088-1\ROH RSAG2.908.1260-2\ROH
RSAG7.820.1272\VER.B\ROH
RSAG7.820.1101\VER.B\ROH RSAG7.820.1337\VER.B\ROH
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LCD TV Service Manual
4.2 Wires and Cables Overall Wiring Diagrams
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LCD TV Service Manual
5. Factory/Service OSD Menu and Adjustment
5.1 To enter the Factory OSD Menu
a. With factory RC (remote control)
1. Press “M” button and enter factory mode.
2. Press “Menu” button and enter factory OSD menu. 3 . Press “CH+”/“CH-” button select the function menu, press “VOL+”/“VOL-” enter the selected function menu. Press “VOL+”/“VOL-” button adjust values in the menu.
4. Press “M” button exit factory mode in the factory OSD menu. When TV outgoing factory,user can not enter factory OSD menu with Factory Remote
b. With user’s RC
1. Power TV On
2. Press Menu button and call up User OSD Menu
3. Select Sound-> Balance
4. When Balance value is “0”,Enter 0->5->3 ->2 in sequence.
Note: If necessary, re-do number keys.
5. Factory OSD appears.
6. Press the standby button then AC turn off and restart the TV, which can exit factory OSD menu.
5.2 Factory OSD Menu
The Factory OSD Menu comprises Factory Menu and Design Menu .
5.2.1Factory Menu
Factory Menu White Balance Auto Test Auto Calibration LOGO OSD Language Country Option Factory Init Test Pattern Version:
White Balance
R DRV 8 G DRV 10 B DRV 10 R CUT 136 G CUT 130 B CUT 121 BRIGHT_H 80 CONTRAST _H 80 BRIGHT_L 40 CONTRAST_L 40
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LCD TV Service Manual
Auto Calibration
Auto Color Color Temp. Standard RED COLOR 136 GREEN COLOR 130 BLUE COLOR 121
Option
SOURCE TV BRIGHT 0 10 BRIGHT 50 100 BRIGHT 100 150 CONTRAST 0 60 CONTRAST 50 100 CONTRAST 100 150 TOFAC M HDMI Cable Standard DQS PHASE 3
LOGO
NULL HISENSE WELCOME EGYPT OFF
Factory Init
QingDao HuangDao Guiyang shunde Hungary France Australia CLEAR PROTECTLY CLEAR UNPROTECTLY Turkey
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