Haier LET39Z18HF User manual

SERVICE MANUAL
LED TV
Model No. LET39Z18HF
Chassis
MT5310
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair
the product or products dealt with in this service information by anyone else could result in serious injury or death.
Haier Group
©2011 Qingdao Haier Electronics Co., Ltd.
All rights reserved. Unauthorized copying and distribution is a violation of law.
WARNING

1-1. Table of Contents
1. General Information
1-1. Table of Contents
1-3. Important Notice
4
Chapter 1: General Information
1
4
1-2. General Guidelines
1-4. How to Read this Service Manual
4
7
....................................................................................
Service Manual
Model No.:
- 1 -
3. Location of Controls and Components
3-1. Board Location
3-2. Main Board
3-3. Power Board
3-4. LCD Panel
4. Disassemble and Assemble .......................................................
7
8
8
8
11
12
14
5. Electrical Parts ....………………...........…………......................... 19
5-1. Circuit Diagram 19
6. Trouble-shooting ……….............................................................. 28
2. Specification
.........................................
......................................................................

Service Manual
Model No.:
- 02 -

1-2. General Guidelines
When servicing, observe the original lead dress. Ifashort circuit is found, replace all parts
which have been overheated or damaged by the short circuit.
After servicing, see to it that all the protective devices such as insulation barriers, insulation
papers shields are properly installed.
After servicing, make the followingleakage current checks to prevent the customer from
beingexposed to shock hazards.
1) Leakage Current Cold Check
2) Leakage Current Hot Check
3) Prevention ofElectro Static Discharge (ESD) to Electrostatically Sensitive
1-3. Important Notice
1-3-1. Followthe regulations and warnings
Most important thingis to list up the potential hazard or risk for the service personnel to
open the units and disassemble the units. For example, we need to describe properly
howto avoid the possibility to get electrical shock fromthe live power supply or charged
electrical parts (even the power is off).
This symbol indicates that high voltage is present inside.It is dangerous to
make any kingofcontact with any inside part ofthis product.
This symbol indicates that there are important operatingand maintenance
instructions in the literture accompanyingthe appliance.
1-3-2. Be careful to the electrical shock
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to rain or excessive moisture. This TV must not be exposed to drippingor splashingwater,
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1-3-3. Electro static discharge (ESD)
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such
components commonly are called Electrostatically Sensitive (ES) Devices. The following
techniques should be used to help reduce the incidence ofcomponent damage caused by
electros static discharge (ESD).
1-3-4. About lead free solder (PbF)
This product is manufactured usinglead-free solder as apart ofamovement within the
consumer products industry at large to be environmentally responsible. Lead-free solder
must be used in the servicingand repairingofthis product.
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Special parts which have purposes offire retardant (resistors), high-quality sound
(capacitors), lownoise (resistors), etc. are used.
When replacingany ofcomponents, be sure to use only manufacture's specified parts
shown in the parts list.
Safety Component
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Service Manual
Model No.:
- 03-

1-3-6 Safety Check after Repairment
- 04 -
Service Manual
Model No.:
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in the original positions, or whether there are the positions which are deteriorated around
the serviced places serviced or not. Check the insulation between the antennaterminal or
external metal and the AC cord plugblades. And be sure the safety ofthat.
General ServicingPrecautions
1. Always unplugthe receiver AC power cord fromthe AC power source before;
a. Removingor reinstallingany component, circuit board module or any other receiver
assembly.
b. Disconnectingor reconnectingany receiver electrical plugor other electrical
connection.
c. Connectingatest substitute in parallel with an electrolytic capacitor in the receiver.
CAUTION: Awrongpart substitution or incorrect polarity installation ofelectrolytic
capacitors may result in an explosion hazard.
2. Test high voltage only by measuringit with an appropriate high voltage meter or other
voltage measuringdevice (DVM, FETVOM, etc) equipped with asuitable high voltage
probe.
Do not test high voltage by "drawingan arc".
5. Do not defeat any plug/socket B+ voltage interlocks with which receivers covered by this
service manual might be equipped.
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3. Do not spray chemicals on or near this receiver or any ofits assemblies.
4. Unless specified otherwise in this service manual, clean electrical contacts only by
applyingthe followingmixture to the contacts with apipe cleaner, cotton-tipped stick or
comparable non-abrasive applicator; 10% (by volume) Acetone and 90% (by volume)
isopropyl alcohol (90%-99% strength).
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Capacitors may result in an explosion hazard.
6. Do not apply AC power to this instrument and/or any ofits electrical assemblies unless
all solid-state device heat sinks are correctly installed.
7. Always connect the test receiver ground lead to the receiver chassis ground before
connectingthe test receiver positive lead.
Always remove the test receiver ground lead last. Capacitors may result in an explosion
hazard.
9. Remove the antennaterminal on TV and turn on the TV.
10. Insulation resistance between the cord plugterminals and the eternal exposure metal
should be more than Mohmby usingthe 500V insulation resistance meter.
11. Ifthe insulation resistance is less than M ohm, the inspection repair should be required.
Ifyou have not the 500V insulation resistance meter, use aTester. External exposure
metal: Antennaterminal Headphone jack

Service Manual
Model No.:
- 05 -
Electrostatically Sensitive (ES) Devices
1-3-7. OrderingSpare Parts
1. Immediately before handlingany semiconductor component or semiconductor-
equipped assembly, drain off any electrostatic charge on your body by touchingaknown
earth ground. Alternatively, obtain and wear acommercially available dischargingwrist
strap device, which should be removed to prevent potential shock reasons prior to applying
power to the unit under test.
2. After removingan electrical assembly equipped with ESdevices, place the assembly
on aconductive surface such as aluminumfoil, to prevent electrostatic charge buildup or
exposure ofthe assembly.
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to damage ESdevices.
7. Immediately before removingthe protective material fromthe leads ofareplacement
ESdevice, touch the protective material to the chassis or circuit assembly into which the
device will be installed.
CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other
safety precautions.
3. Use only agrounded-tip solderingiron to solder or unsolder ESdevices.
Some semiconductor (solid-state) devices can be damaged easily by static electricity.
Such components commonly are called Electrostatically Sensitive (ES) Devices.
Examples oftypical ESdevices are integrated circuits and some field-effect transistors
and semiconductor "chip" components. The followingtechniques should be used to help
reduce the ncidence ofcomponent damage caused by static by static electricity.
4. Use only an anti-static type solder removal device. Some solder removal devices not
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6. Do not remove areplacement ESdevice fromits protective package until immediately
before you are ready to install it.
(Most replacement ESdevices are packaged with leads electrically shorted together by
conductive foam, aluminumfoil or comparable conductive material).
8. Minimize bodily motions when handlingunpackaged replacement ESdevices.
(Otherwise harmless motion such as the brushingtogether ofyour clothes fabric or the
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an ESdevice.)
Please include the followinginformations when you order parts. (Particularly the Version
letter)
1. Model number, Serial number and Software Version
The model number and Serial number can be found on the back ofeach product and the
Software Version can be found at the Spare Parts List.
2. Spare Part No. and Description
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- 06 -
Service Manual
Model No.:
1-3-8. Photo used in this manual
The illustration and photos used in this Manual may not base on the final design of
products, which may differ fromyour products in some way.
1-4. How to Read this Service Manual
Using Icons:
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each icon is described in the table below:
Note:
A“note” provides information that is not indispensable, but may nevertheless be valuable
to the reader, such as tips and tricks.
Caution:
A“caution” is used when there is danger that the reader, through incorrect manipulation,
may damage equipment, loose data, get an unexpected result or has to restart(part of) a
procedure.
Warning:
A“warning” is used when there is danger ofpersonal injury.
Reference:
A“reference” guides the reader to other places in this binder or in this manual, where he/
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Service Manual
Model No.:
- 07 -
Model
Screen Size 39inch
Aspect Ratio 16:9
Resolution 1920x1080
Response Time (ms) 8 (GRAY TO
GRAY)
Angel of View 176o
Color Display 16777216
No. of Preset Channels 200
OSD Language Eng...
Color System PAL
Audio System BG/DK/I
Audio Output Power
(Built-in) (W) 10W×2
Audio Output Power
(outer) (W) No
Total Power Input (W) 100W
Voltage Range (V) AC100V-240V
Power Frequency (Hz) 50~60Hz
LET39Z18H
2. Specification

- 08 -
Service Manual
Model No.:
3. Location of Controls and Components
3-1 Board Location
No. Part Number Description
A Board
B Board
3-2 Main Board
Main board
Power board
DH1QP0M0102M
0113050494
B

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







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



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











CN4: Main
Power Supply
CN3:
Inverter
CN19: DVD
Power & Control
CN11: LVDS
Interface
CN16: Amplifier
Power Supply
CN17:
Speaker
CN10: IR &
Key Interface
CN25: External
HDMI In
CN15: External
USB In
*CN20: DVD
Signal In

Service Manual
Model No.:
- 09 -
3-2-1 Function Description:
Main Board
Process signal which incept from exterior equipment then translate into signal that panel
can display.
Main board connector
Power connectors (CN3,CN4)
CN3
CN4

- 10 -
Service Manual
Model No.:
Keypad and remote connector (CN10)
Pin number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Signal name
GND
K7
K6
K5
K4
K3
K2
K1
K0
GND
IR
LED_G
LED_R
+5V
Description
Ground
Power key
NC
CH- key
CH+ key
Vol- key
Vol+ key
Meny key
TV/AVkey
Ground
IR Receive
Green Indicator
Red Indicator
+5VDC Power Supply

3-3. Power Board
Service Manual
Model No.:
- 11 -
Pin Noᕅ㝊 Symbolㅖ Description᧿䘠
1 , 2 +12V
3ˈ4ˈ5ˈ12ˈ13 GND
6ˈ7ˈ10ˈ11 +5V
8 +5VSB
9 ON/OFF
Location˄ս㖞˅: CON1
Connector type˄ㄟᆀර˅: VH-3A2 (3.96mm) or equivalent
Pin assignments: Table.
Pin Noᕅ㝊 Symbolㅖ Description᧿䘠
1 AC-L
3 AC-N
Location˄ս㖞˅: CON5
Connector type˄ㄟᆀර˅: XH-4W (2.5mm) or equivalent
Pin assignments: Table.
Pin Noᕅ㝊 Symbolㅖ Description᧿䘠
1 , 2 GND
3ˈ4 +24V
DC Output˄ⴤ⍱䗃ࠪ˅:
Location˄ս㖞˅: CON4
Connector type˄ㄟᆀර˅: XH-13W (2.5mm) or equivalent
Pin assignments: Table.

3-4. LED Panel
- 12 -
Service Manual
Model No.:
g0576.PYT]g[thgieW

32:(5&2168037,21
FEATURES
CHARACTERISTICS ITEMS SPECIFICATIONS
Screen Diagonal [in] 38.5
Pixels [lines] 1920 × 1080
Active Area [mm] 853.92(H) x 480.33(V)
Sub-Pixel Pitch [mm] 0.17675(H) x 0.53025(V)
Pixel Arrangement RGB vertical stripe
Physical Size [mm] 955.04(W) × 545.66(H) × 2.00(D) Typ.
Display Mode Transmissive mode / Normallly black
Contrast Ratio 5000:1 Typ.
(Typical value measure at CMI’s module)
Glass thickness (Array / CF) [mm] 0.5 / 0.5
Viewing Angle (CR>20) +88/-88(H), +88/-88(V) Typ. (CR 20)ʁ
(Typical value measure at CMI’s module)
Color Chromaticity * Please refer to “color chromaticity”on p.32
Cell Transparency [%] 5.6%
Polarizer Surface Treatment Anti-Glare coating (Haze 3.5%)
Hard Coating (3H)
:
OPEN CELL LABEL

Service Manual
Model No.:
- 13 -
3-5 Interface Connec t ions
Description
Ground
LVDS Data Format Selection 2
First pixel Odd LVDS Signal-
First pixel Odd LVDS Signal+
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
Symbol
GND
NC
SELLVDS
NC
NC
GND
CH1[0]-
No
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
59
50
51
-
Symbol
-
Descrip tion
NC
NC
NC
NC
DC power supply
NC
CH1[0]+
CH1[1]-
CH1[1]+
CH1[2]-
CH1[2]+
GND
CH1CLK-
CH1CLK+
CH1[3]-
CH1[3]+
GND
CH1[4]-
CH1[4]+
Ground
First pixel Odd LVDS Clock-
First pixel Odd LVDS Clock+
First pixel Odd LVDS Signal-
First pixel Odd LVDS Signal+
First pixel Odd LVDS Signal-
First pixel Odd LVDS Signal+
Ground
First pixel Odd LVDS Signal-
First pixel Odd LVDS Signal+
First pixel Odd LVDS Signal-
First pixel Odd LVDS Signal+
Ground
NC
NC
Second pixel Odd LVDS Signal-
Second pixel Odd LVDS Signal+
CH2[0]-
CH2[0]+
CH2[1]-
CH2[1]+
CH2[2]-
CH2[2]+
GND
CH2CLK-
CH2CLK+
CH2[3]-
CH2[3]+
GND
CH2[4]-
CH2[4]+
Ground
Ground
Second pixel Odd LVDS Signal-
Second pixel Odd LVDS Signal+
Second pixel Odd LVDS Signal-
Second pixel Odd LVDS Signal+
Second pixel Odd LVDS Signal-
Second pixel Odd LVDS Signal+
Second pixel Odd LVDS Signal-
Second pixel Odd LVDS Signal+
Second pixel Odd LVDS Clock-
Second pixel Odd LVDS Clock+
1
1
1
1
1
1
1
1
1
1
1
1
NC
NC
GND
GND
GND
NC
1
VCC
VCC
VCC
VCC
DC power supply
DC power supply
DC power supply
CNF1 Connector Pin Assignment: (FI-RE51S-HF(JAE) or equivalent)

4. Disassemble and assemble
Service Manual
Model No.:
- 14 -
Front
Back

Service Manual
Model No.:
- 15 -
4-1, Remove the 4 screws as below picture
4-2, Remove the 17 screws on the back cabinet

Service Manual
Model No.:
- 16 -
4-3, Remove the 4 screws on the backcabinet.
4-4, Remove the 2 screws as below picture

Service Manual
Model No.:
- 17 -
4-5, Remove the 3 screws on the fixing board
4-6,Remove the 2 screws as below picture

Service Manual
Model No.:
- 18 -
4-7,Remove the 4 screws as below picture
4-8,Remove the PCB board as below picture

Service Manual
Model No.:
- 19 -
5. Electrical parts
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X)< 9  9
&
X)< 9  9
%6 
,1
6: 
*1 '

)% 
&20 3

(1

1& 
8
$ ,& )* 5 75
&
1 & S) 1 32 f 9
&
X); 5 f 9
5
. RKP 
&
X); 5 f 9
5
. RKP 
5
. RKP 
&
X)< 9 9
*1'
*1'
*1'
&
X)< 9 9
/
& + 8 . *
5
. RKP 
$9''9
0B9 0 B9
*1'
&
X)< 9  9
0 B9
&
X)< 9 9
*1'
0B9
/
& + 8 . *
/
RKP f
9''9 36;  B9  
/
RKP f
&
X)< 9  9
&
X)< 9  9
9,
92 
$' -

92 
8
/& & /75 

(
X)9 f h
9,
92 
$' -

92 
8
/& & /75 
&
X)< 9 9
9 B67%
&
X)< 9 9
9 B67 %
*1'
9 B6 7 %

(
X)9 fh
''59
&
X)< 9 9

(
X)9 fh
*1'
5
. RKP 
5
RKP 
&
X)< 9 9
&
X)< 9  9
*1'
*1'
&
X); 5 f9
9,
92 
$' -

92 
8 /& & /75 $ '
''59
*1'
'
0)RUPRVD06
'
0)RUPRVD06
0B9


(
X)9 fh

(
X) 9 f h 

(
X)9 fh

(
X)9 fh 

(
X)9 fh 


(
X)9 fh
5-1. Circuit Diagram