Panasonic LH80 Service Manual

ORDER NO. MTV0801611CE

LCD TV

TX-R32LE8

LH80 Chassis

Specifications

	Power Source :	AC SINGLE 220-240 V, 50/60 Hz
	Power Consumption
	Average Use	138 W
	Standby condition	1.0 W
	Display panel
	Aspect Ratio	16:9
	Visible screen size	698 mm (W) × 392 mm (H)
	(No. of pixels)	1,049,088 (1,366 (W) × 768 (H))
	Sound
	Speaker	Full range × 2 pcs, 8 Ω
	Audio Output	20 W (10 W + 10 W), 10% THD
	Headphones	M3 (3.5 mm) Jack × 1
	PC signals	VGA, SVGA, XGA, WVGA, WXGA
		Vertical scanning frequency 60 Hz
	Receiving Systems / Band name	SYSTEMS		FUNCTIONS
		———————————————————————————————————————
	1 PAL B, G, H
	2	PAL I		Reception
	3	PAL D, K		of broadcast
				transmission and
	4	SECAM B, G
				playback from
	5	SECAM D, K
				video cassette tape
	6	SECAM K1		recorders.
	7 NTSC M (NTSC 3.58 / 4.5 MHz)
		———————————————————————————————————————
	8	NTSC 4.43 / 5.5 MHz		Playback from
	9 NTSC 4.43 / 6.0 MHz			special VCR’s or DVD.
			© 2008 Matsushita Electric Industrial Co., Ltd. All
			rights	reserved. Unauthorized copying and
			distribution is a violation of law.

TX-R32LE8

10	NTSC 4.43 / 6.5 MHz
11	NTSC 3.58 / 5.5 MHz	Playback from
12	NTSC 3.58 / 6.0 MHz	special VCR’s or DVD.

13NTSC 3.58 / 6.5 MHz

14SECAM I

———————————————————————————————————————

15	PAL 60 Hz / 5.5 MHz
16	PAL 60 Hz / 6.0 MHz
17	PAL 60 Hz / 6.5 MHz
Aerial - Rear	VHF / UHF
Operation Conditions	Temperature : 0°C - 35°C
	Humidity : 20% -- 80% RH (non-condensing)

Playback from Special Disc Players

and Special VCR’s or DVD.

Connection Terminals :
AV1	AUDIO L-R	RCA PIN Type × 2	0.5	V[rms]
Input	VIDEO	RCA PIN Type × 1	1.0	V[p-p] (75 Ω )
AV2	AUDIO L-R	RCA PIN Type × 2	0.5	V[rms]
Input	VIDEO	RCA PIN Type × 1	1.0	V[p-p] (75 Ω )
	COMPONENT	Y	1.0	V[p-p] (including synchronization)
		PB / CB, PR / CR	±0.35 V[p-p]
AV3	AUDIO L-R	RCA PIN Type × 2	0.5	V[rms]
Input	VIDEO	RCA PIN Type × 1	1.0	V[p-p] (75 Ω )
	S VIDEO	Mini DIN 4-pin	Y: 1.0 V[p-p] (75 Ω) C: 0.286 V[p-p] (75 Ω)
Others	HDMI 1/2 Input	TYPE A Connectors
	Audio Input for	RCA PIN Type × 2	0.5	V[rms]
	HDMI 1
	PC Input	HIGH-DENSITY D-SUB 15 PIN	R, G, B / 0.7 V[p-p] (75 Ω)
			HD, VD / TTL LEVEL 2.0-5.0 V[rms] (high
			impedance)
Monitor	AUDIO L-R	RCA PIN Type × 2	0.5	V[rms] (high impedance)
Output	VIDEO	RCA PIN Type × 1	1.0	V[p-p] (75Ω )
Dimensions (W × H × D)		820 mm × 578 mm × 225 mm (With TV Stand)
		820 mm × 539 mm × 107.5 mm (TV only)
Mass		17 kg (Net)

Design and specifications are subject to change without notice. Mass and dimensions shown are approximate.

CONTENTS

		Page			Page
1	Safety Precautions	4		4.2. Power LED Blinking Timing Chart	7
	1.1. General Guidelines	4	5	Chassis Board	9
	1.2. Touch-Current Check	4		5.1. Chassis Installation	9
2	Prevention of Electro Static Discharge (ESD) to		6	Location of Lead Wiring	10
	Electrostatically Sensitive (ES) Devices	5		6.1. Wire Dressing	10
3	About Lead Free Solder (PbF)	6		6.2. Wire Dressing and Connections	10
4	Self Check Function	7	7	Disassembly for Service	11
	4.1. Self Check	7		7.1. AC Code dressing for 2-Pin	11

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7.2. AC Code dressing for 3-Pin	11		10.1. A-Board	21
7.3. Chassis Rail Installation	12		10.2. A-Board	22
7.4. VESA Bracket Installation	13	11	Schematic Diagram	23
7.5. Pedestal Assembly Preparation	14		11.1. Schematic Diagram Notes	23
7.6. LED Panel Installation	16		11.2. A Board	24
7.7. LCD Panel Assembly Installation	17		11.3. G Board	34
8 Service Mode Adjustment	18		11.4. K Board	36
8.1. SERVICE 1	18		11.5. P Board	37
8.2. SERVICE 2	18		11.6. SW Board	41
8.3. Self Check Mode	18		11.7. V Board	42
8.4. Hotel Mode Adjustment	18		11.8. Z Board	46
9 Adjustment	20	12	Parts Location & Mechanical Replacement Parts List	50
9.1. Voltage Chart of A Board	20		12.1. Parts Location	50
9.2. Voltage Chart of P board	20	13	Packing Exploded View	51
9.3. DVCO Adjustment	20	14	Replacement Parts List	52
10 Conductor Views	21		14.1. Electrical Replacement Parts List	53

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1 Safety Precautions

1.1. General Guidelines

1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit.

2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly installed.

3. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards.

1.2. Touch-Current Check

1.Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.

2.Connect a measuring network for touch currents between each exposed metallic part on the set and a good earth ground such as a water pipe as shown in Figure 1.

3.Use the Leakage Current Tester (Simpson 228 or equivalent) to measure the potential across the measuring network.

4.Check each exposed metallic part and measure the voltage at each point.

5.The potential at any point (touch current) expressed as voltage U1 and U2, do not exceed the following values: For AC: U1 = 35 V (peak) and U2 = 0.35 V (peak);

For DC: U1 = 1.0 V,

NOTE :

The limit value of U2 = 0.35 V (peak) for AC and U1 = 1.0 V for DC correspond to the values 0.7 mA (peak) AC and 2.0 mA DC. The limit value U1 = 35 V (peak) for AC correspond to the value 70 mA (peak) AC for frequencies greater than 100 kHz.

6.Should a measurement be out of the limits specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is returned to the customer.

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2 Prevention of Electro Static Discharge (ESD) to Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some fieldeffect transistors and semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage caused by electro static discharge (ESD).

1.Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap, which should be removed for potential shock reasons prior to applying power to the unit under test.

2.After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminium foil to prevent electrostatic charge buildup or exposure of the assembly.

3.Use only a grounded-tip soldering iron to solder or unsolder ES devices.

4.Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static (ESD protected)" can generate electrical charges sufficient to damage ES devices.

5.Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.

6.Do not remove a replacement ES device from its protective package until immediately before you are ready to install it (most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminium foil or comparable conductive material).

7.Immediately before removing the protective material from the leads of a replacement ES device, 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.

8.Minimize bodily motions when handling unpackaged replacement ES devices (otherwise harmless motions such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) sufficient to damage an ES device).

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3 About Lead Free Solder (PbF)

Note: Lead is listed as (Pb) in the periodic table of elements.

In the information below, Pb will refer to Lead Solder and PbF will refer to Lead Free Solder.

The Lead Free Solder (PbF) used in our manufacturing process and discussed below is (Sn+Ag+Cu). Those are Tin (Sn), Silver (Ag) and Copper (Cu), although other types are available.

This model uses PbF in its manufacture due to environmental conservation issues. For service and repair work, we would suggest the use of PbF as well, although Pb may be used.

PCBs manufactured using lead-free will have the “PbF within a leaf Symbol” stamped on their back.

Caution

•PbF has a higher melting point than that of standard solder. Typically the melting point is 50 ~ 70°F (30~40°C) higher. Please use a high temperature soldering iron and set it to 700 20°F (370 10°C).

•PbF will tend to splash when heated too high (about 1100°F or 600°C).

If you must use Pb solder, please completely remove all of the PbF on the pins or solder area before applying Pb. If this is not practical, be sure to heat the PbF until it melts, before applying Pb.

•After applying PbF to double layered boards, please check the component side for excess solder which may flow onto the opposite side (see Figure 2).

Figure 2

Suggested PbF

There are several kinds of PbF available for purchase. This product uses Sn+Ag+Cu (tin, silver, copper) solder. However, Sn+Cu (tin, copper) and Sn+Zn+Bi (tin, zinc, bismuth) solders can also be used.

Figure 3

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4 Self Check Function

4.1.Self Check

1.Self Check is used to automatically check the bus lines and hexadecimal codes of the TV set.

2.To get into the Self Check mode, press the “DOWN” button on the customer’s controls at the front of the set, at the same time pressing the “MENU” button on the remote control. The screen that will show is represented by Figure 4.

3.Press both “OFF TIMER” button on the remote control and “DOWN” key button on the control panel.

Figure 4

4.2.Power LED Blinking Timing Chart

1.Subject

Information of LED blinking timing chart.

2.Contents

When an abonormality has occurred in the unit, the protection circuit operates and resets to standby mode. At this time, the defective block can be identified by the number of blinks of the Power LED on the front panel of the unit.

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5 Chassis Board

5.1.Chassis Installation

1.Fix 12 screws to ‘A-board’ and ‘P-board’.

Tightening torque should be 50 Ncm to 80 Ncm (5 kgf cm to 8 kgf cm).

2.Fix connectors G1, G2 and G3 to AT G-board.

3.Fix 2 screws to the side of AV bracket assembly.

Tightening torque should be 100 Ncm to 130 Ncm (10 kgf cm to 13 kgf cm).

4.Fix 1 screw to cabinet with power switch PCB bracket.

Tightening torque should be 100 Ncm to 130 Ncm (10 kgf cm to 13 kgf cm).

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6 Location of Lead Wiring

6.1.Wire Dressing

= FELT-TMK4G215 = 7 pcs

6.2.Wire Dressing and Connections

	CONNECTION	1	2	3	4	5	6	7	8	9	10	11
1	CN 2 ~ P 2
2	A 2 ~ P 4
3	A 1 ~ P 3
4	CN 2 ~ A 6
5	G 1 ~ A 4
6	G 2 ~ A 5
7	V 1 ~ A 7
8	A 12 ~ SPEAKER (L)
9	A 12 ~ SPEAKER (R)
10	P 1 ~ SW 2

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7 Disassembly for Service

7.1.AC Code dressing for 2-Pin

7.2.AC Code dressing for 3-Pin

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7.3.Chassis Rail Installation

1.Put on the bottom mounting and fix with 4 screws.

Tightening torque should be 100 N cm - 130 N cm (10 kgf cm to 13 kgf cm).

2.Stick sponges at chassis rails no.1 and no.3.

3.Fix 3 pieces of chassis frames and fix 4 screws to the bottom and top mountings. Tightening torque should be 100 N cm - 130 N cm (10 kgf cm to 13 kgf cm).

= SCREW 8 pcs

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7.4.VESA Bracket Installation

1.Stick 2 pieces of felt on each part of the VESA bracket.

2.Fix 4 screws to VESA bracket.

Tightening torque should be 100 Ncm to 130 Ncm (10 kgf cm to 13 kgf cm).

3.Slot pedestal assembly and fix 4 screws to cabinet.

Tightening torque should be 100 Ncm to 130 Ncm (10 kgf cm to 13 kgf cm).

= SCREW 4 pcs = SCREW 4 pcs

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7.5.Pedestal Assembly Preparation

7.5.1.Pedestal Rotation Base

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7.5.2.Pedestal Stand Base

7.5.3.Pedestal Stand Cover

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7.6.LED Panel Installation

1. Put PCB to LED panel and ensure hook is properly locked on the PCB.

2.Fix LED panel to cabinet with 3 screws.

Tightening torgue should be 0.5 N m ~ 0.8 N m (5 to 8 kgf cm).

= Screw 3 pcs

3. Fix wires at cabinet slit and make sure all wires are fully inserted to avoid contact with the pedestal metal.

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7.7.LCD Panel Assembly Installation

1.Put LCD panel to cabinet assembly.

2.Put LCD top mounting, LCD bottom mounting and LCD side mounting to cabinet assembly.

3.Fix screw into LCD top mounting, LCD side mounting and LCD bottom mounting. Tightening torque should be 100 N cm ~ 130 N cm (10 kgf cm to 13 kgf cm).

4.Stick sponges at top mounting and bottom mounting.

= SCREW 7 pcs,

= SCREW 6 pcs,

= SPONGE 6 pcs

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8 Service Mode Adjustment

Set channel 99, then set the timer to 30 min. Press the “RECALL” button on the remote control and the “-” button on the LCD panel.

8.1.SERVICE 1

1. Press the red button (on the remote control) for adjustment below.

8.2.SERVICE 2

1. Select CEC CHECK mode in service 1, then press the “HOLD” button (on the remote control) to enter service 2.

8.3.Self Check Mode

1.Press the “TIMER” button (on the remote control) and the “DOWN” button on the LCD panel.

2.Press the “NORMALIZE” button (on the remote control) to Exit.

8.4.Hotel Mode Adjustment

1.Press the “VOLUME DOWN” button on the TV panel while pressing the “TV/AV” button on the remote control.

2.Press the “MENU” button on the remote control to Exit the Hotel Mode Function.

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