Funai PLF-77-TD Service manual

TFT PORTABLE DVB-T/DVD PLAYER

SUNSTECH PLF-77TD

SERVICE MANUAL

 2006- PRINTED IN

R598MB

CAUTION: Before servicing the chassis, read the “IMPORTANT SERVICE SAFETY INFORMATION” section on

page 2 of this manual.

SPECIFICATIONS

l GENERAL SPECIFICATION

l 7” ACTIVE- MATRIX TFT TYPE.
l DVD, VCD, CD, CD-R, CD-RW, MP3, DIVX, HDCD

SUPPORTS.

l USB FUNCTION
l 16:9 / 4:3 PICTURE SELECT.
l HIGH BRIGHTENNESS.
l HIGH CONTRAST.
l WITH LOGO OPENING SCREEN.
l SLOW MOTION ½, 1/4, 1/8, 1/16
l F.B / F.F x2, x4, x8, x16 SPEED.
l ANGLE MENU.
l 20 TRACK PROGRAM FOR CD PLAYING.
l ZOOM x 2, 3, 4.
l REMOTE CONTROL.
l S. VIDEO OUTPUT (for Ext. TV Monitor)
l HEADPHONE OUT x 1.
l AUDIO OUTPUT 0.5W x 2/8 ohm.
l LONG BATTERY TIME OF OVER 2 HRS.
l DIMENSION :

212(L) x 170(W) x 4 30(H) mm(excluding battery)

l AC POWER SOURCE:

ADAPTER: 230V

l DC POWER SOURCE: BATTERY PACK: 7.2V
l FEATURES FOR DVB-T TUNER (FREE ON AIR)
l FREQUENCY RANGE :

VHF CH5 – CH12 (174MHZ – 230MHZ)
UHF CH21 - CH69 (470MHZ – 862MHZ)

l 1,000 PROGRAMMABLE FAVORITE CHANNELS
l 9 PICTURES FOR PROGRAM AUTO -SCAN
l EPG FUNCTION SUPPORT (TELE-TEXT OPTION)
l PROGRAM LIST WITH PROGRAM PREVIEW AFTER

TUNER POWER ON

l OSD TRANSPARENT ADJUSTMENT.
l FULL FUNCTION REMOTE CONTROL

CONTENTS

IMPORTANT SERVICE SAFETY INFORMATION................2

DISASSEMBLY FOR REPAIR .................................................3

WIRING DIAGRAM…………… ………………………....……4

BLOCK DIAGRAM....................................................................5

CIRCUIT DESCRIPTION .............................……………...6~14

PARTS LIST ..........................................…………............ 1 5~28

EXPLODED VIEW (CABINET) ............................................. 29

EXPLODED VIEW (DVB-T).................................................. 30

SCHEMATIC DIAGRAMS.................. ...............................31~39

PRINTED CIRCUIT BOARDS.......................................... 4 0~57

Note: Follows a policy of continuous advancements in development. For this reason specifications may be changed without notice.

1. SAFETY PRECAUTIONS

Before returning a unit to the customer, always make a safety check
of the entire unit, including, but not limited to the following items:
a. Be sure that no built -in protective devices are defective and/or have
been defeated during servicing.
(1) Protective shields are provided to protect to protect both the
technician and the customer. Correctly replace all missing protective
shields including any removed for servicing convenience.
(2) When reinstalling the chassis and/or other assemblies in the
cabinet, be sure to put back in place all protective devices, including, but
not limited to, nonmetallic control knobs, insulating fishpapers,
adjustment and compartment covers/shields and isolation resistor
capacitor networks. Do not operate this unit of permit it to be operated
without all protective devices correctly installed and functioning.
b. Be sure that there are no cabinet openings through which an adult
or child might be able to insert their fingers and contact a hazardous
voltage. Such openings include, but are not limited to, excessively wide
cabinet ventilation slots, and an improperly fitted and/or incorrectly
secured cabinet back cover.
c. Leakage Current Hot Check - With the unit completely
reassembled, plug the AC line cord directly into a AC outlet. (Do not
use an isolation transformer during this test.) Use a leakage current
tester or a metering system that complies with American National
Standards institute (ANSI) C101.1 “Leakage Current for Appliances”
and Underwriters Laboratories (UL) 1410, (50.7). With the unit AC
switch first in the ON position and then in the OFF position, measure
from a known earth ground (metal water pipe, conduit, etc.) to all
exposed metal parts of the unit (antennas, handle bracket, metal cabinet,
screwheads, metallic overlays, control shaft, ect.), especially any
exposed metal parts that offer an electrical return path to the chassis.
Any current measured must not exceed 0.5 milliamp. Reverse the unit
power cord plug in the outlet and repeat test.
ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED
HEREIN INDICATE A POTENTIAL SHOCK HAZARD THAT
MUST BE ELIMINATED BEFORE RETURNING THE UNIT TO
THE CUSTOMER.

AC LEAKAGE TEST

d. Insulation Resistance Test Cold Check
(1) Unplug the power supply cord and connect a jumper wire
between the two prongs of the plug.
(2) Turn on the power switch of the unit.
(3) Measure the resistance with an ohmmeter between the jumpered
AC plug and each exposed metallic cabinet part on the unit, such as
screwheads, antenna, control shaft, handle brackets, etc. When the
exposed metallic part has a return path to the chassis, the reading

ANTENNA
TERMINAL

2

EXPOSED

IMPORTANT SERVICE SAFETY INFORMATION

(READING
SHOULD
NOT BE
ABOVE

0.5mA)

EARTH
GROUND

METAL

PART

DEVICE

UNDER

TEST

TEST ALL EXPOSED
METAL SURFACES

2-WIRE CORD ALSO
TEST WITH PLUG
REVERSED (USING AC
ADAPTER PLUG A
REQUIRED)

OHMMETER

OM

LEAKAGE
CURRENT
TESTER

should be between 1 and 5.2 Megohm. When there is no return path to
the chassis, the reading must be “infinite”. If it is not within the limits
specified, there is the possibility of a shock hazard, and the unit must
be repaired and rechecked before it is returned to the customer.

2. PRODUCT SAFETY NOTICE

Some electrical and mechanical parts have special safety related
characteristics which are often not evident from visual inspection, nor
can be protection they give necessarily be obtained by replacing them
with components rated for higher voltage, wattage, etc. Parts that have

special safety characteristics are identified by a ¡I on schematic and
parts list. Use of a substitute replacement that does not have the same
safety characteristics as the recommended replacement part might create
shock, fire, and/or other hazards. Product Safety is under review
continuously and new instructions are issued whenever appropriate.

3. SERVICING PRECAUTIONS
CAUTION: Before servicing the unit covered by this service manual
and its supplements, read and follow the SAFETY PRECAUTIONS on
this page. NOTE: If unforeseen circumstances create a conflict between
the following servicing precautions and any of the safety precautions,
always follow the safety precautions. Remember: Safety First.
General Servicing Precautions.
a. Always unplug the unit’s AC power cord from the AC power
source before:
(1) removing or reinstalling any component, circuit board, module, or
any other unit assembly.
(2) disconnecting or reconnecting any unit electrical plug or other
electrical connection.
(3) connecting a test substitute in parallel whit an electrolytic
capacitor in the unit.
Caution: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an explosion hazard.
b. Do not defeat any plug/socket B+ voltage interlocks with which
the unit covered by this service manual might be equipped.
c. Do not apply AC power to this unit and/or any of its electrical
assemblies unless all solid-state device heat sinks are correctly installed.
d. Always connect a test unit ground lead to the unit chassis ground
before connecting the test unit positive lead. Always remove the test
instrument’s ground lead last.

4. LASER PRECAUTIONS
WARNING!

1. When servicing (in case it is necessary to confirm Laser Beam
Emission), be sure not to place your eyes any closer than 1 ft or 30cm
from the surface of the Object Lens on the Optical Pickup Block.
HANDLING THE LASER PICKUP

2. Laser diodes are extremely susceptible to damage from static
electricity. Even if a static discharge does not ruin the diode, it can
shorten its life or cause it to work improperly. When replacing the
pickup, use a conductive mat on the floor and desk and wear a wrist

band connected to ground through a 1M ohm resistor to protect the

laser diode from static damage. If the lens should get dusty, blow off the

OF PROCEDURES HEREIN MAY RESULT IN HAZARDOUS

dust carefully from the object.

3. There are no adjustable parts in the pickup assembly. If it is
defective, replace the whole pickup assembly.
CAUTION:
USE OF CONTROLS, ADJUSTMENTS OR PERFORMANCE

RADIATION EXPOSURE.
DANGER:
IF INTERLOCK FAILS OR IS DEFEATED, THE LASER LIGHT
IS ABLE TO FUNCTION. THE LASER IS INVISIBLE, AVOID
DIRECT EXPOSURE TO BEAM.

3

DISASSEMBLY FOR REPAIR

TO DISASSEMBLY THE BOTTOM METAL CABINET

1. Remove the 14 screws (A) from bottom metal cabinet.

TO REMOVE THE INNER PANEL

2. Remove the 6 screws (B) from the inner panel and out panel.

4

WIRING DIAGRAM

5

BLOCK DIAGRAM

CIRCUIT DESCRIPTION

100m? Power Distribution Switches: RT9701CB (U7)

NiMH BATTERY CHARGER CONTROLLER: LS2964S (U6)

Timer
LED
OSC

1
2
3

8
7
6

VDD
PWM
Vdet

GND

4

5

Idet

DUAL OPERATIONAL AMPLIFIER: RC4558D (U7,16)

A OUTPUT

1

8

V +

A -INPUT

A +INPUT

V -

2

3

4

7

B OUTPUT

6

B -INPUT

5

B +INPUT

6

CIRCUIT DESCRIPTION

PROGRESSIVE SCAN DVD PLAYER COMBO CHIP: MT1389DE/B-L (U5)

VIDEO PROCESSOR FOR MIDDLE SIZE LCD PANEL: VX1828 (U1)

7

CIRCUIT DESCRIPTION

2-WIRE SERIAL EEPROM: AT24C02BN-10SU-1.8 (U6,U12)

DUAL LOW-VOLTAGE POWER AMPLIFIER: NJM2073M (U3)

8