Toshiba 20HLV86 Schematic

FILE NO. 813-200603GR

- S U M M A R Y -

This Service Manual covers the different part(s) form Service Manual (File No.810-200638GR) for Model 20HLV86. Use this Service Manual together with the Service Manual for 20HLV86.

SERVICE MANUAL

LCD TV/DVD COMBINATION

20HLV86

When panel is exchanged, please see the "ELECTRICAL ADJUSTMENTS", and adjust the image

quality.

The above model is classified as a green product (*1), as indicated by the underlined serial number. This Service Manual describes replacement parts for the green product. When repairing this green product, use the part(s) described in this manual and lead-free solder (*2).

For (*1) and (*2), see the next page.

DOCUMENT CREATED IN JAPAN, June, 2006 GREEN

(*1) GREEN PRODUCT PROCUREMENT

The EC is actively promoting the WEEE & RoHS Directives that define standards for recycling and reuse of Waste Electrical and Electronic Equipment and for the Restriction of the use of certain Hazardous Substances. From July 1, 2006, the RoHS Directive will prohibit any marketing of new products containing the restricted substances.

Increasing attention is given to issues related to the global environmental. Toshiba Corporation recognizes environmental protection as a key management tasks, and is doing its utmost to enhance and improve the quality and scope of its environmental activities. In line with this, Toshiba proactively promotes Green Procurement, and seeks to purchase and use products, parts and materials that have low environmental impacts.

Green procurement of parts is not only confined to manufacture. The same green parts used in manufacture must also be used as replacement parts.

(*2) LEAD-FREE SOLDER

This product is manufactured using lead-free solder as a part of a movement within the consumer products industry at large to be environmentally responsible. Lead-free solder must be used in the servicing and repair of this product.

WARNING

This product is manufactured using lead free solder .

DO NOT USE LEAD BASED SOLDER TO REPAIR THIS PRODUCT !

The melting temperature of lead-free solder is higher than that of leaded solder by 86°F to 104°F (30°C to 40°C). Use of a soldering iron designed for lead-based solders to repair product made with lead-free solder may result in damage to the component and or PCB being soldered. Great care should be made to ensure high-quality soldering when servicing this product  especially when soldering large components, through-hole pins, and on PCBs  as the level of heat required to melt lead-free solder is high.

ELECTRICAL ADJUSTMENTS

1. ADJUSTMENT PROCEDURE

Read and perform these adjustments when repairing the circuits or replacing electrical parts or PCB assemblies.

CAUTION

•

Use an isolation transformer when performing any service on this chassis.

•

When removing a PCB or related component, after unfastening or changing a wire, be sure to put the wire back in its original position.

•

When you exchange IC and Transistor with a heat sink, apply silicon grease on the contact section of the heat sink. Before applying new silicon grease, remove all the old silicon grease. (Old grease may cause damages to the IC and Transistor).

Prepare the following measurement tools for electrical adjustments.

1. Patterm Generator

On-Screen Display Adjustment

1.2.Set the VOLUME to minimum. Press the VOL. DOWN button on the set and the channel button (9) on the remote control for more than 2 seconds to display adjustment mode on the screen as shown in Fig. 1-1.

Function

Use the Channel UP/DOWN button or Channel button

01 H POSI OSD 175

(0-9) on the remote control to select the options shown in Fig. 1-2.

Press the INPUT button on the remote control to end the adjustments.

To display the adjustment screen for TV, AV, GAME, YUV, HDMI, DVD and PC mode, press the INPUT button on the remote control to set to the TV, AV, GAME, YUV, HDMI, DVD and PC mode. Press the VOL.DOWN button on the set and the channel (9) on the remote control for more than 2 seconds.

Step No.

Fig. 1-1

FUNCTION

NO.

H POSI OSD

V POSI OSD

R DRIVE(N)

R CUT OFF(N)

G DRIVE(N)

G CUT OFF(N)

B DRIVE(N)

B CUT OFF(N)

R DRIVE(C)

R CUT OFF(C)

G DRIVE(C)

G CUT OFF(C)

B DRIVE(C)

B CUT OFF(C)

R DRIVE(W)

R CUT OFF(W)

G DRIVE(W)

G CUT OFF(W)

B DRIVE(W)

B CUT OFF(W)

FUNCTION

NO.

H POSI 60Hz

V POSI 60Hz

BAK LIGHT CENT

BAK LIGHT MAX

BAK LIGHT MIN

BRIGHT CENT

BRIGHT MAX

BRIGHT MIN

TINT

SHARP CENTER

SHARP MAX

SHARP MIN

CONTRAST CENTER

CONTRAST MAX

CONTRAST MIN

COLOR CENT

COLOR MAX

COLOR MIN

Fig. 1-2

2. BASIC ADJUSTMENTS

2-1: CONTRAST MAX

Receive the monoscope pattern. (RF Input)

Using the remote control, set the brightness and contrast to normal position.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (36) on the remote control to select "CONTRAST MAX".

Press the LEFT/RIGTH button on the remote control until the contrast step No. becomes "212"

Check if the picture is normal.

Receive the monoscope pattern. (VIDEO Input)

Press the INPUT button on the remote control to set to the AV mode.

Using the remote control, set the brightness and contrast to normal position.

Activate the adjustment mode display of Fig. 2-1 and press the channel button (36) on the remote control to select "CONTRAST MAX".

10.

Press the LEFT/RIGTH button on the remote control until the contrast step No. becomes "216".

11.

Check if the picture is normal.

12.

Playback the DVD(480i) disc. (COMPONENT Input)

13.

Press the INPUT button on the remote control to set to the YUV mode. Then perform the above adjustments 8~11.

14.

Playback the DVD(480i) disc. (HDMI Input)

15.

Press the INPUT button on the remote control to set to the HDMI mode.

16.

Using the remote control, set the brightness and contrast to normal position. Activate the adjustment mode display of Fig. 1-1 and press

17.

the channel button (36) on the remote control to select "CONTRAST MAX".

18.

Press the LEFT/RIGTH button on the remote control until the contrast step No. becomes "165".

19.

Check if the picture is normal.

D-1

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