Toshiba 55L7400U series Service Manual

SERVICE MANUAL

LCD Color Television

55L7400U series

(System Information)

FILE NO. 050-2014029

REVISED:01

REVISION HISTORY

REV

Date

Reason for Change

1

Oct/2/2014

- Addition of Note in Procedure 5 of "FIRMWARE UPDATING."

CONTENTS

1. I MP O RTANT NOTICE

2. GRE E N P RO DUCT PROCUREMENT

3. LEAD-FREE SOLDER

4. SA FE TY INSTRUCTI O N

5. SERVICE MODE

6. LED INDICATIONS FOR SERVICE

7. FI RMWARE UPDATING

8. MAIN BOARD EXCHANGE

9. SETTING SHIPOUT CODE (when Main board is
exchanged)

10. WRITING SERIAL NUMBER INTO MAIN BOARD

11. INTERCONNECT

12. EXPLODED VIEW

13. SCHEMATIC DIAGRAM

1

IMPORTANT NOTICE

WARNING:

You are requested that you shall not modify or alter the information or data provided
herein without prior written consent by Toshiba. Toshiba shall not be liable to
anybody for any damages, losses, expenses or costs, if any, incurred in connection
with or as a result of such modification or alteration.

THE INFORMATION OR DATA HEREIN SHALL BE PROVIDED "AS IS" WITHOUT ANY
WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED WARRANTY OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Toshiba shall not be liable for any damages, losses, expenses or costs, if any,
incurred in connection with or as a result of use of any information or data provided
herein.

GREEN PRODUCT P ROCUREMENT

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 recogni zes environmental prot ection as a key managemen t task s, an d i s doi n g
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.

LEAD-FREE SOLDER

This product is manufactur ed usi ng 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 54ºF to
72ºF (30ºC to 40ºC). 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. Gr ea t car e s h oul d be m ade to ensure high-q uali ty soldering when serv i c ing
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.