Toshiba 26AV52R Service-Handbuch

S.M.A.R.T.

Service Material and Reference Tips

Product: LCD Date: 7/01/2009

Models: 26AV52R, 26AV502R, 32AV52R, 32AV502R, 37AV52R, 37AV502R

Doc Ref/File: SMART2009-LCD509-V4

Purpose: The purpose of this document is to give the service provider

troubleshooting information designed to expedite the diagnosis and service

process to modular/sectional level for Toshiba products.

[The information contained within the document will evolve over time so a version number has

been indicated in the document name. The servicer should always use the latest version

available.]

Table of Contents

Section l Chassis Layout and Plug location

Chassis and Plug Layout…....…………....…..….2

Interconnect………………….………...................3

Section ll Modular Troubleshooting Flowcharts

Dead Set …………………………………………...4

Video Problems …………………....……….......5,6

Audio Problems …………………...………………7

Section lll Technical Aids

Firmware Updates…………………………….…8,9

Factory Mode……………………………………..10

Parts List…………………………….………...…..11

Feedback: Please provide any comments or suggestions about this document

to [email protected] When commenting, please provide

the document and version number on all correspondence.

SMART2009-LCD509-V4 Page 1 of 11

DISPLAY T-CON CN3 LVDS

CN11 ALT

LVDS (26 in)

CN5

IR-REC/LED

CN2

SPKR

MAIN PCB

POWER PCB

P802 PWR

P803 INV

P801 AC

CN8 PWR

CN101

INVERTER

MANUAL

KEYS AND

FRONT

JACKS

SMART2009-LCD509-V4 Page 2 of 11

Inverter

1. 24V<

2. 24V<

3. 24V<

4. 24V<

5. 24V<

6. Gnd

7. Gnd

8. Gnd

9. Gnd

10. Gnd

11. NC

12. BL On 5V<

13. Dim .1 to 3V<

14. NC

Power Supply In/Out

1. Gnd

2. Gnd

3. 24V Aud>

4. 24V Aud>

5. Gnd

6. Gnd

7. Gnd

8. 12V>

9. 12V(Panel Pwr.)>

10. 5V>**

11. 5V>**

12. 5V>**

13. Pwr. On (Enable) 2.4V<

14. AC Det.(PWR Good) .07V>

15. Dim .1 to 3V<

16. BL On 5V<

Wiring Interconnect

26/32/37AV52R

26/32/37AV502R

CN1

CN3 LVDS

ALT LVDS (26 in)

Pins 2, 4, 6, 8 –

12V Panel Power M

CN2

SPEAKERS

CN5

CN10

BLANK

IR REC/LED

LED/IR

1. 5V<**

2. IR>

3. GND

4. LED Logo

5. LED Green (Power)

P802

Power PCB

Main PCB

Key

Standby**

Pin 1

Flow <-out >-in

SMART2009-LCD509-V4 Page 3 of 11

5 VDC present

at pins 10, 11, and 12 of

CN8 on the main module

when AC is

applied?

Does

a 2.4 volt on off

signal appear at pin

13 of CN8 when the

on/off button is

pressed?

Yes

Suspect a problem with

the standby 5 volt supply

on the power supply

module.

Is the

Power Good

(AC Detect) level

less than .07V at pin

14 of CN8

when AC is

applied?

Yes No

Suspect a problem with

the power supply module.

Does

the secondary

12 volt source appear

at pin 8 of CN8 when

the on/off button is

pressed?

No Suspect a problem

with the SYSCON

circuit located on the

Main module.

Yes

Suspect a

problem with the

Main module.

Dead Set

(No Sound and

No Picture or No LED)

SMART2009-LCD509-V4 Page 4 of 11

When

the input button

is pressed on the

receiver or remote, is

the on screen

display clear and

normal?

NOYES

Using the

power distribution

diagram, are the

voltages normal at CN8

of the power supply

module?

Suspect the

power supply

module.

YES

Replace

the Main

Module.

No or distorted

video

Does

the back light function

normally when the unit

is turned on?

YES

Troubleshoot for

backlight problelms.

the screen

discolored or does it

have streaks and dark

areas on the

screen?

If the LCD Control

Board (T-con) is

available, try it. If this

does not help, replace

the LCD display panel.

***

YES

Examples

*** Warranty Authorization required if

display is replaced in warranty – Go

to www7.toshiba.com for instructions.

Check for LVDS activity at

CN3. If it is present suspect a

problem with the display control

board (Tcon). If it is not present

replace the main PCB.

This signal viewed from

LVDS connector

referencing cold ground.

SMART2009-LCD509-V4 Page 5 of 11

Does

the back light

function and then

turn off or is there a

dark horizontal area

on the

screen?

YESNO

24 VDC present

at pins 1 through 5 of

P803 on the power PCB

when the unit is

turned

on?

YES

Replace the

Power supply

module.

YES

If it is

available , try one or both

inverters. If this does not

help, replace the LCD

display. ***

*** Warranty Authorization

required if display is

replaced in warranty – Go

to www7.toshiba.com for

instructions.

Backlight

Troubleshooting

Replace the

Main module.

Is 4.5VDC

present at pin 16

of P802 shortly (.5 sec)

after the unit is

turned on?

Replace the

display. ***

Remove

AC, then unplug the

LVDS cable(s). Does 24 volts

return when AC is reapplied

and the unit

is turned on?

YES

SMART2009-LCD509-V4 Page 6 of 11

Using

the remote or

the manual keyboard,

access the audio menu to

assure the speakers are on

and the input selection is a

known good source.

Will this restore

audio?

Does the

power supply

generate the audio

supply voltages (24 VDC

at pins 3 and 4 of CN8)

when the unit is

turned

on?

YES

Replace the

power supply

module.

YES

Replace the

Main module

Problem

solved.

No Audio

SMART2009-LCD509-V4 Page 7 of 11



SMART2009-LCD509-V4 Page 8 of 11



SMART2009-LCD509-V4 Page 9 of 11



Factory Mode

The factory mode, necessary adjustments, and update procedures shown below can be

accessed in this unit using the supplied remote control transmitter.



To enter the factory mode, you must press “Left Arrow (<), then Exit, then Enter” within

approximately two seconds. To end this function, press exit or simply turn the television

off.

SMART2009-LCD509-V4 Page 10 of 11

Andere Handbücher für 26AV52R

Dieses Handbuch passt für folgende Modelle

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