Rolsen LT-30FEP, LT-30FLP, LT-30FTP Service manual

30” WIDE TFT-LCD TV

SERVICE MANUAL

CHASSIS:
MODEL: LT-30FEP / LT-30FLP / LT-30FTP

CONTENTS

Contents ................................................................................................................ 2

Safety Precautions ............................................................................................3

Specifications ..................................................................................................... 4

Control Descriptions ....................................................................................... 6

Adjustment...........................................................................................................9

Troubleshooting..................................................................................................11

Disassembly Instructions ..............................................................................13

Replacement Parts List ............................................................................... 19

Schematic Diagram ......................................……………………….............................26

PCB Printings ............................................................................……………27

2

SAFETY PRECAUTIONS

Important Safety Notice

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the Schematic Diagram and Replacement Parts List.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.

Leakage Current Hot Check (See below Figure)

Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor between a known good earth ground (Water
Pipe, Conduit, etc.) and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter with 1000 ohms/volt or more sensitivity.
Reverse plug of the AC cord into the AC outlet and repeat AC voltage measurements for each exposed
metallic part. Any voltage measured must not exceed 0.75 volt RMS, which is, corresponds to 0.5mA.
In case any measurement is out of the limits specified, there is possibility of shock hazard and the set must
be checked and repaired before it is returned to the customer.

Leakage Current Hot Check circuit

3

SPECIFICATIONS

Note: Specifications and others are subject to change without notice for improvement.

1. Power requirement:

‥AC 110-240V, 50/60Hz (Cold SMPS)

/ DC 24V ADAPTOR

2. Tuning system:
‥FVS, 100 program memory

3. Sound output:
‥105W+10W

4. Intermediate Frequency (IF):

‥Vision IF ; 38.9MHz
‥Color IF ; 34.47MHz(PAL) / 35.32MHz(NTSC)
‥Sound IF ; 33.4MHz (B/G) / 32.9MHz(I,I/I) /

32.4MHz(D/K, K1) / 34.4MHz(M)

5. Power consumption:

‥130W(3W-ST-BY)

6. Antenna input impedance:

‥VHF/UHF 75ohm , TIF

7. Voice coil impedance:

‥4ohm option

8. OSD (On Screen Display):

‥Window Type

Receiving system

No.

System
1 PAL-B O O O
2 PAL-G O O O
3 PAL-I, I/I O O O
4 PAL-D O O O
5 PAL-K O O O
6 SECAM-B O O O
7 SECAM-G O O O
8 SECAM-D O O O
9 SECAM- K O O O

10 SECAM-K1 O O O
11 SECAM-I (6.0) O O O
12 NTSC-3.58/4.5 X X O
13 NTSC-3.58/5.5 X X O
14 NTSC-3.58/6.0 X X O
15 NTSC-3.58/6.5 X X O
16 NTSC-3.58/4.5(5.0) X X O
17 NTSC-4.43/5.5 X X O
18 NTSC-4.43/6.0 X X O
19 NTSC-4.43/6.5 X X O
20 PAL 5.5/60HZ O O O
21 PAL 6.0/60HZ O O O
22 PAL 6.5/60HZ O O O
23 SECAM 5.5/60HZ O O O
24 SECAM 6.0/60HZ O O O
25 SECAM 6.5/60HZ O O O
26 SECAM L/L’ X O X

TOTAL SYSTEM 17 18 25

Model No.

9. External in/output: Headphone, SCART or
Phone Jack: Option

‥Audio-In ; 0.4Vrms, over 10Kohm
‥Video-In/Out ; 1Vp-p,over 75ohm
‥R.G.B In ; 0.7Vp-p

10. Function:

‥CATV/Hyper band
‥Auto Program
‥Manual Program
‥Auto Sleep
‥Recall
‥Quick view
‥ACMS(Auto channel Memory System)
‥PSM(Picture Status memory)
‥SSM(Sound Status memory)
‥PIP(PICTURE I RICTURE)
‥ARC(ASPECT RATIO CONTROL)

LT-30FEP LT-30FLP LT-30FTP

4

TABLE1. RECEIVING SYSTEM (26 SYSTEM)

No.

Receiving System Function Receiving Channel

1 PAL-B
2 PAL-G
3 PAL-I, I/I
4 PAL-D
5 PAL-K
6 SECAM-B
7 SECAM-G

Reception of broadcast
and play-back for Video
Tape Recorder

8 SECAM-D
9 SECAM- K

10 SECAM-K1
11 NTSC-M
12 SECAM-L/L’

13 NTSC-4.43/5.5
14 NTSC-4.43/6.0
15 NTSC-4.43/6.5

Play-back for special
Video Tape Recorder

16 SECAM-I (6.0MHZ)
17 SECAM-L (VIDEO IN)
18 NTSC 3.58/4.5MHZ/50HZ
19 PAL 5.5MHZ/60HZ
20 PAL 6.0MHZ/60HZ
21 PAL 6.5MHZ/60HZ
22 SECAM 5.5 MHZ /60HZ

Play-back for special
Video Tape/Video disk
player

23 SECAM 6.0 MHZ /60HZ
24 SECAM 6.5 MHZ /60HZ
25 NTSC-3.58/5.5MHZ
26 NTSC-3.58/6.0MHZ

27

NTSC-3.58/6.5MHZ

Play-back for special
Video Tape Recorder

VHF Band

PAL/SECAM-B: 2-12
PAL/SECAM-D: 1-12
SECAM-K1: 2-9
NTSC-M (US): 2-13
NTSC-M (JAPAN): 1-12

UHF Band

PAL/SECAM-G: 21-69
PAL-I: 21-69
SECAM-K: 21-69
PAL-K: 13-56
NTSC-M (US): 14-78
NTSC-M (JAPAN): 13-62

5

CONTROL DESCRIPTIONS

All the functions can be controlled with the remote control handset.
Some functions can also be adjusted with the buttons on the front panel of the set.

Remote controller

Before you use the remote controller, please install the batteries.

1. POWER

Turns the TV on from standby or off to standby mode.

2. MUTE

Turns the sound on and off.

3. NUMBER buttons

Selects programme numbers.

4. PSM (Picture Status Memory)

Recalls your preferred picture setting

5. SSM (Sound Status Memory)

Recalls your preferred sound setting

8. TV/AV

Selects TV, SCART, VIDEO, S-VIDEO or PC mode.
Clears the menu from the screen.

7. MENU

Displays a main menu.

6. I/II

Selects the language during dual language broadcast.
Selects the sound output.

9. SLEEP

Sets the sleep timer.

10. TV/PC

Selects TV or PC mode directly.

11. PR▲▼ (Programme Up/Down)
Selects next programme or a menu item.

12. VOL◀▶ (Volume Up/Down)
Adjusts the sound level.
Adjusts menu settings.

13. OK

Accepts your selection or displays the current mode.

14. TELETEXT Buttons

These buttons are used for TELETEXT.
For further details, see the ‘TELETEXT’ section.

15. Q.VIEW

Returns to the previously viewed programme.
Note: In TELETEXT mode,
The Q.VIEW button is used for TELETEXT function.

16. PIP

Displays a PIP(Picture In Picture).

17. ARC

Selects a screen mode-, 16:9, 14:9, ZOOM 1:1 and Auto Wide.

18. INPUT

Selects the AV source of sub picture in PIP mode.

19. POSITION

Selects a position of PIP.

20. SWAP

Switches a main picture for sub picture.

21. MODE

Selects a PIP screen mode. – 16:1, 9:1, double window and scan mode

22. ▼ ▲

Selects a programme when RF signal is displayed in PIP mode.

6

CONTROL DESCRIPTIONS

Battery installation

▶Inserting batteries

1. Remove the battery cover by pulling it upward in the direction shown by the arrow.

2. Insert the batteries with correct polarity (“+" to "+", and "-" to "-”).

3. Replace the battery compartment cover.

* Install two high-quality 1.5V "AAA" alkaline batteries. Don't mix old batteries with new batteries.
*Remove batteries when you won't use the remote controller for long time. Liquid leakage from old batteries
may cause operation failure.

Notes for using remote controller

• Make sure there are no objects between the remote controller and its sensor.

• Don't place the remote control near a heater or in damp place. Strong impact to the remote control may
cause operation failure.

• Signal from the remote control may be disturbed by sunlight or other bright light. In this case, darken the
room or move the TV.

7

DESCRIPTION OF CONTROLS

<<CONTROLLER OF PANEL>>

1. MENU
Displays a menu.

2. + PR - (Programme Up/Down)
Selects a programme or a menu item.

3. POWER STANDBY INDICATOR
Illuminates in red when the TV is in standby mode./ Illuminates in green when the TV is switched on.

4. POWER Switches TV set on or off.

5. Remote control sensor Accepts the IR signal of remote controller.

6. +VOL- (Volume Up/Down)

Adjusts the volume level./ Adjusts menu settings.

7. TV/AV

Selects TV, SCART, VIDEO, S-VIDEO, PC Analog or PC Digital mode. / Clears the menu from the screen.

6

7

1. DC 24V adaptor input

2. PC/DTV INPUT

3. DVI

4. PC Audio IN
Connect the audio cable from the PC to the PC Audio IN of the set.

5. HEADPHONE out

Connect a headphone to this socket.

6. S-VIDEO input

Connect the output of an S -VIDEO VCR to the S-VIDEO input.
Connect the audio outputs of an S-VIDEO VCR to the Audio IN (L(MONO), R).

7. SCART2

8. SCART1
Connect the Audio/Video outputs of external equipment to scart jack.

9. Ant. (Antenna input)

1

2

3
4

5

8

ADJUSTMENT

Safety Precautions

1. Never disconnect leads while the TV receiver is on.

2. Don't short any portion of circuits while power is on.

3. The adjustment must be done by the correct appliances. But this is changeable in view of
productivity.

4. Unless otherwise noted, set the line voltage to 230Vac 10%, 50Hz. / 110Vac, 60Hz

Test Equipment required

1. RF signal generator (with pattern generator)

2. Multi meter (volt meter)

3. Oscilloscope

4. LCD Color analyzer

RF AGC (Automatic Gain Control) Adjustment

The RF AGC was aligned at the time of manufacturing for optimum performance over a wide range
conditions. Readjustment of RF AGC should not be necessary unless unusual local conditions exist, such as ;

1) Channel interference in a CATV system.

2) Picture bending and/or color beats, which are unusually due to excessive RF signal input when the

receiver is too close to a transmitting tower or when the receiver is connected to an antenna
distribution system where the RF signal has been amplified. In this case, the input signal should be
attenuated (with pad or filter) to a satisfactory level.

3) Picture noise caused by "broadcast noise" or weak signal. If the broadcast is "clean" and the RF

signal is at least 1mV (60dBu), the picture will be noise free in any area.

Adjusting RF AGC to one end of rotation will usually cause a relatively poor signal to noise ratio; Adjusting to
the other end of rotation will usually cause a degradation of over load capabilities resulting in color beats or
adjacent channel interference.

9