Philips 14PT135B/42 User Manual download pdf (Page 2)

2PHILIPS AA5 (AA) Chassis

Teletext Diagram / Electrical Adjustments / Safety Parts / Repair Facilities / Repair Facilities Cont’d / CRT PCB (20” narrow neck)

Power Supply Diagram / Control Diagram / Video Audio CRT 14/15/17/21” mini neck Diagram / Teletext Diagram / Tuner IF Diagram

Repair facilities Cont’d

Service default mode (SDM)

The service default mode is a pre-defined mode

which can be used when for faultfinding

(especially when the TV gives no picture at all).

All oscillograms and DC voltages in this service

manual are measured in the service default

mode.

Entering the service default mode can be done

in 2 ways:

1. By short-circuiting the service pins Si and S2

of the microcomputer (pin 7 of 107600) while

switching on the set with the mains switch

2. From normal operation mode by pressing the

button “DEFAULT” on the DST (Dealer

Service Tool) RC7150.

Leaving the service default mode to normal

operation can only be done by the stand-by on

the remote control (so not via mains switch “off”;

after mains switch “off” and then “on” again the

set will start up in the Service Default Mode

again to enable easy faultfinding).

Functions of the service default mode

(see Fig 8.1):

1. All analog settings (volume, contrast,

brightness and saturation) are in the mid

position (in iC with Vi .0 the volume in the

SDM is set at 25%, from Vi .1 onwards the

volume in the SDM is set at 50%).

2. For VST sets are to program number 1

indicated in the right top corner

3. For PLL sets are tuned to 475.25 MHz

4. Delta volume settings are not used (delta

volume setting per program in reference with

the PP volume setting which is valid for all

programs)

5. OSD error message (present available error

code) is displayed continuously

6. Store open and store close commands will act

as search and auto store

7. Automatic switch off function (set switches

“off” after 15 minutes no DENT) will be

switched off

8. Hotel mode will be disabled

9. All other functions remain normal controllable

10.A counter in the middle of the screen indicate

the normal operation hours of the set in a

hexadecimal code (every time the set is

switched “on” the counter is incremented by 1

hour, so +i at the counter).

11. An “S” in the middle of the screen (next to

the counter) indicate that the set is in the

service default mode

Counter + “5” for SDM 0023 S 1

active + prog nr.

Fig. 8.1

Service Menu (SM)

Entering the service menu can be done in 2

ways:

1. From service default mode by simultaneously

pressing the buttons “-” and “+” buttons on the

local keyboard.

2. From normal operation mode by pressing the

button “ALIGN” on the DST RC7150.

Leaving the service menu to normal operation

can be done in 2 ways:

1. Via the stand-by on the remote control

2. Via mains switch “off”

For reading a new option setting, the set must

be switched “on” by the mains switch (so not by

stand-by as by then the EEPROM settings are

not read).

Functions of the service menu (see Fig 8.2);

1. Software version of the microprocessor used

in that typical set is displayed in the right top

corner

2. A counter in the middle of the screen indicate

the normal operation hours of the set in a

hexadecimal code (every time the set is

switched “on” the counter is incremented by i

hour, so+1 at the counter).

3. The “S” in the middle of the screen next to the

counter indicate that the set is in the service

default mode

4. Error code history; The 5 last different error

codes occurred are stored in the EEPROM

memory; last error code detected will be

displayed on the right side (see for an

overview of all possible error codes Fig. 8.4),

50 e.g.:

0 0 0 0 0

means no error codes present in the buffer

0 0 0 0 3

means one error code present in the buffer;

error code 3

0 0 0 3 2

means two error codes present in the buffer;

last detected error code is error code 2,

previous detected error code is error code 3

The error code history buffer is cleared as soon

as the Service Menu is left by the stand-by

command. In case the Service Menu is left by

the mains switch “off” the error code history

buffer will not be cleared.

Counter + “S” for SM 0023 S 1.0

active + software version

Error code history 0 0 0 3 2

Option setting bar - SYSTEM BG+l +

YNNYYNNNYYYN

Fig. 8.2

5. Option setting;

The options of the set can be changed in the

service menu. In the 2 bottom lines the options

are given. Control of the options is with the

following keys on the remote control:

* PROGRAM +/ -

Select the option to be changed;

Via the “PROGRAM +/-“ button to option to be

changed can be selected by scrolling through

the possible options in the upper row from left to

right (via the “PROGRAM +“ button) or from

right to left (via the “PROGRAM -“ button). The

selected option will be displayed in the upper

row, the present “Y” or “N” status of that option

(see table 8.3) will be blinking in the bottom row

(when arrived at the end of the row the scrolling

will be continued at the other side).

* MENU +/-

Change the selected option via “MENU +/-“

buttons the selected option can be changed.

The selected Y (yes) or N (no) blinks and via

either “MENU +“ or the “MENU you toggle

through the “Y” or “N” possibility.

The options (both the changed and the not-

changed options) are stored in the EEPROM as

soon as the service menu is left (by stand-by or

mains switch “off”). The new option settings are

only read after mains switch “on” (so not after

switching on the set from stand-by mode).

The following table indicates the possible

options and there technical consequences:

Error messages

The microcomputer also detects errors in

circuits connected to the I ~ (Inter IC) bus.

These error messages are communicated via

OSD (On Screen Display) and a flashing LED

both in normal operation and in the service

menu (error code history buffer):

1. In normal operation;

In normal operation both the “OSD error

message” and the “LED error” indication will

display the present detected error. The display-

ing of both the OSD and the LED error indica-

tion will only take a limited time.

2. In the service default mode;

In the service default mode both the “OSD error

message” and the “LED error” indication will

display the present detected error. In the service

default mode both the OSD and the LED error

indication will be displayed permanently.

3. In the service menu;

In the service menu both the “OSD error

number” (in the error code history) and the “LED

error” indication will display the present detected

error. In the service default mode both the OSD

and the LED error indication will be displayed

continuously.

→

Reset volume/program (delta volume) for all

programs at once

It is also possible to leave the service menu with

the MENU button. After one time pressing the

MENU button in the service menu, a new menu

is entered (see Fig. 8.5) in which the volume/

programs-settings (also called delta volume

settings) of nil. programs can be deleted. In

case YES is selected via the MENU+ button, all

volume/program-settings are deleted at once.

After another time pressing the MENU button

the TV will switch to normal operation (when the

service menu is entered via the pins Si and S2)

or service default mode (when the service menu

is entered with the DST).

Counter +“S” for SM 0023 S 1.0

active + software

version

Error code history 0 0 0 3 2

Reset all volume - RESET VOL/PROG +

NO YES

Fig. 8.5

Text displayed in In case the “N” or The technical consequence

the upper option row “Y” blinks, it can be for the selected option

in the service menu changed

SINGLE ➝ NN ➝ For a PAL BG only set

SYSTEM I ➝ NY ➝ For a PAL I only set

SYSTEM BG+L ➝ YN ➝ For a PAL BG + SECAM LL’ set

SYSTEM BG+L+l ➝ YY ➝ For a PAL BGI or PAL EGOKI + SECAM LL’ set

PLL TUNER N ➝ For a VST tuner set

Y ➝ For a PLL tuner set

NO TXT ➝ NN ➝ For a set without teletext

1P TXT ➝ NY ➝ For a set with 1 page WST teletext

4P TXT ➝ YN ➝ For a set with 4 page FLOF teletext

16/9 SWITCH N ➝ Disable 16/9 switching possibility

Y ➝ Enable 16/9 switching possibility

S-VIDEO N ➝ For a set without SVHS connectors

Y ➝ For a set with SVHS connectors

SCART N ➝ For a set without a scart connector

Y ➝ For a set with a scart connector

Note: The SCART option can only be

changed when the S-VIDEO option is “N”

SHARPNESS N ➝ Disable sharpness control

Y ➝ Enable sharpness control

LOCAL MENU N ➝ No ring menu after pressing

Y “MENU” on the local keyboard

➝ Ring menu after pressing “MENU” on the local keyboard

40 PROGRAMS N ➝ 70 programs can be stored

Y ➝ 40 programs can be stored

SLEEPTIMER N ➝ Disable sleeptimer function

Y ➝ Enable sleeptimer function

FOR GERMANY N ➝ Disable ATS function

ONLY Y ➝ Enable ATS function only works when ATS software is present)

Fig. 8.3

“OSD error “OSD “LED error” Error Possible

message” error “on/off” in SEC description defective

normal number” component

operation) (service menu)

No indication 0 No blinking LED No error —

ERROR: RAM 1 1 sec on / 1 sec kC error 1C7600

off

ERROR: BUS 2 2 sec on / 2 sec General 1

C bus is

oft blocked

ERROR: 3 3 sec on / 3 sec EEPROM error 1C7655

EEPROM oft

ERROR: 4 4 sec on

4 sec Teletext error 1C770017702 or

TELETEXT oft option wrong

ERROR: 5 5 sec on / 5 sec PLL tuner error PLL tuner or

TUNER oft option wrong

Fig. 8.4

Hotel mode

* Hotel mode “on”

The hotel is activated when pressing simulta-

neously the “MENU” button on the local

keyboard and the “SLEEPTIMER or OSD”

button on the remote control while program 38

is selected for at least 3 seconds.

When the hotel mode is activated, this is

indicated by a “H+” on the OSD (this will be

displayed until the set is switched of by the

mains switch or via stand-by).

* Hotel mode “off”

Repeat above mentioned procedure once

again. When the hotel mode is de-activated,

this is indicated by a “H-” on the OSD (this will

be displayed until the set is switched of by the

mains switch or via stand-by).

* Functions of the hotel mode

- The volume present on the moment the hotel

mode was switched “on” is the maximum

volume level in the hotel mode.

- The install mode can not be opened (the

message “LOCKED” will be displayed for 3

seconds if a store open command is given).

- The delta volume menu can not be entered.

- PP (personal preference) can not be stored

(the message “LOCKED” will be displayed for

3 seconds if a PP-store command is given).

- At switch “on” (by mains switch or remote

control) program number 1 will always be

selected.

CRT PCB

(20”narrow neck)

Diagram

1 2 3 4 5 6

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Philips 14PT135B/42 User Manual Page 2

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