Power Supply Block Diagram : TX-L37ET5
T*-L37ET5
D7102
Rectifier
( TNPA5583 )
D7200
C7301
C
A T7202
B: TV_SUB_ON=H  PFC on  B=380V
TV_SUB_ON=L  PFC off  B=140V/310V (depend on the AC voltage)
B
Y
S
D7501
Q7200
PFC 7
IC7201
Q7512
IC7502
REG
C7502
P4
Q7501
7
8
9
24V
24V
8
V
VCC
D
VCC
6
VCC
D7502
T7301
C7511
IC7301
Q7201
OUT
VH
D7301,
7302
R73017306
Start Vcc
Q7502
16V
G
5
4
1,2
5
Q7301
5V
8
FB
5VS
DCDC
PC7302
2
2
Q
16V
IC 7400
8
Power
SW
EN
feedback
H
1
2
3
IC7501
P2
Q7510
H=ON
PC7303
I
P
Q7304
TV_SUB_ON
PFC ON
L=ON
PC7304
7
Q7511
Simple Power On Sequence
< Plug In >
P
Power Switching circuit (IC7301/T7301)
start working
P
STB5V output
A
Output TV_SUB_ON signal
P
PFC circuit (IC7201/T7201or7202 ) start working
< Power On >
P
SW/
Remote
Power Switching circuit (IC7301/T7301)
keeps working.
STB5V keeps output.
Power on
A
Output TV_SUB_ON signal
PFC circuit (IC7201/T7201or7202 ) start working
P
16V/24 output
P
A
Peaks read the IC8900
P
16V/24 output
A
Stop TV_SUB_ON signal
A
Output PANEL_VCC_ON2 signal
P
PFC circuit (IC7201/T7201or7202 ) stop
A
Output BL_ON_ON signal
Power off
P
Power Switching circuit (IC7301/T7301)
keeps working.
STB5V keeps output.
Power on
Panamex
January .2012
4 Informe de Koma: Humo por IC7301 dañado
➊ Problema, Descripcion, Acontecimiento
Problema: . Después de 1 hora de instalado el televisor
repentinamente aparece humo y se apaga.
Modelo : TC-L32C4X,
S/ N: MXDA11208435
Donde :
Cuando :
❸ Accion inmediatas/ Mercado / Otros.
Current Lot quality assurance
Activity
Date
Part List Confirmation
On/off Test 48 hrs
5 sets
On/off Test 70 V
5 sets
Result
09/01/2012
11/01/2012
23/01/2012
OK
OK
OK
10/01/2012
10/01/2012
16/01/2012
11/01/2012
16/01/2012
Continous
Already recived
3 cases No smoke
1 case more No smoke
Checo 14 cases, process
PAVCA 1 case, process
We can't not reproduce
Identify root cause
Ocurrio
Recibido
Dec 31
Jan 9th
Sent to Malasya Market sample
Revise Process defect
Revise Market defect
Revise Another Companies
Reportado
Jan 9th
Reproduce Phenomenon
Cuando fue ensamblado :
Assy Linea Dec 1srt
PCB Linea Nov 30th
Preventive action in Panamex Process
Enhancement ESD control
4 findings already OK
Stock in Panamex: 1020 units:
Was released after all confirmation tests.
Market action: Replace P board complete and return at factory
No hubo incendio, lesiones humanas o daños materiales
❹ Recurrence prevention / Horizontal dev.
❷ Causa / estudio de causa de origen
Causa: Sobre carga eléctrica debido a:
By Panamex Production & QC :
- Enhance the ESD activities
a) Increase the time inspection from 1 to 5 min
b) Test devices increase. QC section
A Rendimiento incorrecto del IC Hacer control
Panamex control
B ESD daño parcial mente
1
2
3
4
10/01/2010
8
7
Before
Static Field Meter
After
Static Field Meter
+
1 min by station
5
Static Event Meter
5 min by station
It can detect
Constant fields
internal configuration IC7301
Sensor de Corriente
Origen de la Causa: Bajo estudio por PAVCKM
12/01/2012
C) Daily ESD revision by Production section
Horizontal : To Include Audio factory
By R&D : We wait reply
It can detect
Discharges