LG 60PS7000-ZA (CHASSIS:PD91A) Service Manual ▷ View online
Making
Revision
2009. 2 . 1
8/9
PDP TV
Symptom
C. Sound Problem
No sound/ Sound distortion
Repair Process
8
1.No sound(
If HDMI Input only have no sound, upload EDID data)
Y
Normal
Sound?
N
Check
“Speaker ON/Off” setting
in OSD Menu
Close
Y
Normal
Sound?
N
Close
Check Speaker
jack connection
& Speaker Cable open
Y
Normal
voltage?
N
Check 17V
(Audio IC B+)
on Power B/D
Check Power B/D
Replace Power B/D
Check Audio IC Short
Replace Main B/D
SVC
Bulletin?
Apply
SVC Bulletin
(S/W Upgrade etc)
N
Normal
Sound?
N
Y
Close
Y
2.Sound distortion & sound drop
Check Input signal
→Cable connection
→Cable open
→Cable open
- RF & external
(HDMI,SCART,,,)
Normal
Sound?
Y
Close
Check
AVL off/on
Clear voiceⅡ off/on
Y
Normal
Sound?
N
Close
N
Problem in all input
Problem in only DTV(Case 1)
Problem in external input(Case 2)
(SCART,HDMI,,,)
Check whether Problem happen
in same output of other equipments or not.
(By connecting same output cable of other equipment)
→ DVD Player ,Set-Top-Box, different maker TV etc
Y
Normal
Sound?
N
Check Audio IC
Replace Main B/D
Explain customer that
Cause is RF Signal’s problem (Case 1)
Cause is Equipment’s problem (case 2)
SVC
Bulletin?
Apply
SVC Bulletin
(S/W Upgrade etc)
Normal
Sound?
Y
Close
Y
N
N
Making
Revision
2009. 2 . 1
9/9
PDP TV
Symptom
D. General Function Problem
Remote control & Local switch checking
Repair Process
9
1. Remote controller (R/C) operating error
Y
N
Move
Power problem
Section
2. Local (Mechanical) switch operating error
Check R/C itself
Operation
Normal
operating?
Normal
operating?
Y
Close
Replace R/C
If R/C operate,
Explain the customer
cause is interference
from light in room.
Check R/C Operating
When turn off light
in room
Check & Replace
Battery of R/C
Check & Repair
Cable connection
Connector solder
Connector solder
Normal
operating?
Check B+ 5V
On Main B/D
Normal
Voltage?
Close
N
N
Check 5v on Power B/D
Replace Power B/D or
Replace Main B/D
(Power B/D don’t have problem)
Check IR
Output signal
Normal
Signal?
N
Y
Repair/Replace
IR B/D
N
Replace
Main B/D
Y
Y
N
Check R/C
Operation
Normal
operating?
Y
Check & Repair
Cable connection
Connector solder
Connector solder
Normal
operating?
Close
N
Check & Replace
Assembly status
(Key PCB + tool )
Check Key
Output signal
Y
Normal
operating?
Close
N
Normal
Signal?
Repair/Replace
Local switch B/D
N
Replace
Main B/D
Y
PDP TV Repair Process Index
- Trouble shooting by input block (Component level check)
13
USB Problem
USB Problem
13
14
All Input
No OSD
14
9
Digital TV / HDMI
9
10
Analog TV
10
11
Component / AV / RGB
11
12
Optical Audio
12
Video Probelm
Power Problem
8
All Input
Audio Problem
8
No.
Symptom (L)
Input Block
Page
Remark
1 Power-up
Boot
fail
1
2
Digital TV
2
3
Analog TV
3
4
Component
4
5
RGB(D-SUB)
5
6
AV(Scart / CVBS/ S-Video)
6
7
HDMI
7
Making
Revision
2009. 2 . 1
1/14
PDP TV
Symptom
Power-Up Boot Fail
No
No
No
Doesn’t the low pressure
output come out?
Doesn’t the high tension
output come out?
High tension output
Voltage drop it occurs?
No
No
No
No
Yes
Yes
No
Yes
Yes
No
Is the Interface
signal operated?
signal operated?
2) Check the Interface signal condition
Yes
Yes
Doesn’t the Vs,Va voltage
output come out?
Yes
Yes
Yes
It is identical with
power off condition?
1) Check the Power off condition
Yes
Doesn’t the St-by 5V
signal come out?
Yes
Doesn’t the VSC
Vs-ON signal come out?
Yes
Yes
Manufacture enterprise
meaning of a passage
No
6) Check the
VSC low pressure output
Yes
When remove the Input connector
of Y/Z-Sus Board ,
Does it occur Power Board
of Y/Z-Sus Board ,
Does it occur Power Board
high tension output voltage drop ?
Doesn’t the 5V monitor
signal come out?
Doesn’t the VSC signal
RL_ON come out?
Doesn’t the VSC
Low pressure output
come out?
3) Check the
ST_BY 5V signal circuit
4) Check the
5V Monitor signal circuit
5) Check the
VSC RL_ON signal
7) Check the
VSC Vs_ON signal
8) Check the
Vs, Va voltage output circuit
When remove the Input connector
of Y-Sus Board,
Does it occur output voltage drop ?
9) Check the power board
output high tension circuit
10) Check the
Z B/D Module output circuit
Yes
11) Check the
Y B/D Module output circuit
Doesn’t the screen
whole come out?
whole come out?
When remove the Input connector
of Z-Sus Board,
Does it occur output voltage drop ?
No
No
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