Set-Top Box GELECT HD-HL1209: Schematic Circuit Review and ...€¦ · Set-Top Box GELECT...

RESEARCH & DEVELOPMENT TELECOMMUNICATIONS INSTITUTE

Authors:

Eng. Osmany Yaunner Núñez

Eng. José A. Espinosa Roque

Tech. Spec. Jose D. Alvarez Marín

PhD. Glauco Guillén Nieto

Set-Top Box GELECT HD-HL1209: Schematic Circuit Review and

Temperature Tests

4th International DTV Forum Havana, November 2016


Outline

2/22

Introduction

Goals

Circuit Tests

Temperature Tests

Results

Conclusions

Recommendations


Introduction

3/22

Set-Top Box GELECT HD-HL1209 was introduced in

the market in 2015.

General Features:

High Definition

1 A/V and 1 HDMI outputs

1 USB port

1 RF Loop-through

External Power Supply


Introduction

4/22

After marketing, the sales for this model decreased.

Main argued reason: Extremely high temperature

perceived at touch.

The solution developer HAIER and the assembling

plant GEDEME requested directly to LACETEL to carry

out several tests in order to detect possible failures and

propose a solution.


Purposes

5/22

To evaluate the STB performance under different

conditions.

To identify the possible causes of extremely high

temperature perceived at touch.


Circuit Review (I)

6/22

Electronic SwitchRF Input

Booster Supply

Circuit

Tuner

Circuit


Circuit Review (II)

7/22

Ctrl. signal

from SoC

5 V to STB RF input

IN OUT

EN

GND

ISET

5 V from

Power

Supply

Rset

ON by default and cannot be turned off throgh OSD


Circuit Review (III)

8/22

75 Ω300 Ω

5V

Short Circuit

Folded Dipole

Impedance Adapter

STB RF Input


Circuit Review (IV)

9/22

Temperature Protection

Input

Output


Temperature Tests

10/22

Measurements inside temperature chamber

- Temperature variation inside

temperature chamber

- Test performed for Switch

STI9712 disabled and

enabled (short circuit)

- Duration: 8.15 hoursTemperature Chamber

IN

OUT

TV Set

STB


44,0

46,0

48,0

50,0

52,0

54,0

0 1 2 3 4 5 6 7 8 9

Tem

pera

ture

C

Time (Hours)

STI9712 disable STI9712 actived

Results

11/22Temperature Difference = 1.4 C

d enabled

Measurements inside temperature chamber


Temperature Tests

12/22

Components temperature

Sx.

Generator STB Board

Video Out

TV Set

RF In

46 C

Temperature

Sensor

25 C


Results

13/22Temperature Difference = 40.6 °C

0

10

20

30

40

50

60

70

80

90

0 6 12 18 24 30 36 42 48 54 60

Te

mp

era

ture

(°C

)

Time (minutes)

Switch STI9712enabled

Switch STI9712disabled

25 CComponents temperature: Switch STI9712


Results

14/22

Components temperature: USB port

29313335373941434547495153

0 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60

Te

mp

era

ture

(°C

)

Time (minutes)

USB (switch on)

USB (switch off)

Temperature difference = 6.2 °C

25 C

Switch STI9712 enabled

Switch STI9712 disabled


Results

15/22

Components temperature: RF connector

Temperature difference = 1.1 °C

28

30

32

34

36

38

40

0 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60

Te

mp

era

ture

(°C)

Time (minutes)

RF Connector (switch on)

RF Connector (switch off)

25 C

Switch STI9712 enabled



Temperature Tests

16/22

Components temperature in different STB models

Component STB

SoC DTT1900

Tuner HDP110GD

Demodulator KSDT863-M

RAM HMA50

Flash SDP160

Audio Line Drive DTMB-148BA


Results

17/22

59,0

54

,0

43

,3

39

,2

37

,2

35

,8

57

,2

48

,0

37

,7

39

,2

32

,8

33

,3

TE

MP

ER

AT

UR

E (

°C) GELECT Other STB

25 C

Switch

STI9712

disabled

Components temperature in different STB models


18/22

25

30

35

40

45

50

55

60

0 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60

Tem

per

atu

re(°

C)

Time (minutes)

SoC

Tuner

Demodulator

RAM

Flash

Audio Line Drive

25 C


Additional Temperature TestsComponent with highest temperature


Conclusions (I)

The temperature protection of Switch STI9712 is

activated for short circuit condition.

When Switch STI9712 is enabled in short circuit condition

causes an increase of 1.4 °C inside a temperature

chamber.

The temperature of Switch STI9712 increases in 40.6 °C

when it is enabled in short circuit condition.

19/22


Conclusions (I)

The temperature of a metallic USB device connected to

the STB USB port increases 6.2 °C when Switch

STI9712 is enabled in short circuit condition.

The temperature of RF connector increases 1.1 °C when

Switch STI9712 is enabled in short circuit condition.

When Switch STI9712 is disabled the components

temperature is similar the same components in other

STB models.

20/22


Conclusions (I)

SoC MSD7831 is the component with highest

temperature when Switch STI9712 is disabled.

21/22


Recommendations

To include on the OSD of this STB, the option to

disable/enable the Switch STI9712 output and by default

the 5 V must be disabled.

22/22


DIGITAL

TELEVISION

LABORATORY


www.lacetel.cu


Authors:

Eng. Osmany Yaunner Núñez

Eng. José A. Espinosa Roque

Tech. Spec. Jose D. Alvarez Marín

PhD. Glauco Guillén Nieto

Circuit and Temperature Tests onDTV Receiver GELECT HD-HL1209

Havana, November 20164th International DTV Forum

Set-Top Box GELECT HD-HL1209: Schematic Circuit Review and ...€¦ · Set-Top Box GELECT...

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