Service Manuals, User Guides, Schematic Diagrams or docs for : Sanyo Monitor Sanyo_DP42142_P42142-00_(Z5GH)_[SM]
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2012/03/23
2012-4A
SANYO
TROUBLESHOOTING GUIDE
2012 MODELS
P42142-00 / P42142M-00 / P42142-02 / P42142M-02
This guide is divided into 4 sections/pages depending on type of defect:
page 1)No Green LED Power Light.(LED never turns"ON")
page 2)Green LED Light is "ON", but Backlight is not "ON",or only turn"ON & then OFF".
page 3)Green LED Light is "ON", and Backlight is "ON", but there is no video/OSD.
page 4)Green LED Light turns "ON", but then turns "OFF"within 10 seconds.
Please select the section/page that matches your defect and follow the flow chart.
These models & chassis versions are in this guide:
P42142-00
P42142M-00
P42142-02
P42142M-02
PLEASE KEEP THIS GUIDE.
IT WILL NOT BE PROVIDED FOR EVERY REPAIR.
[email protected]
Repair Flow Chart:Trouble Condition
Green Power LED does not turn on. The TV is dead.
Green Power LED:
Does not turn ON.
The TV is dead.
For Main board: No:0v
Is the "5VSTB" working normally?
(see TABLE*1.0)
Yes:5v
Unplug(K7B) connector on No:0v
Power board. On Power board: Power board can not work.
Is the "5VSTB" working normally? Replace "Power board".
(see TABLE*2.0)
Yes:5v
Main board can not work.
Replace "Main board".
Main board can not work.
Replace "Main board".
(TABLE *1.0)Main board:5VSTB Test Points
42" Models 5VSTB on Main board Confirmation Voltage
P42142-00 Z5GH Main K8B Pin3 5V
P42142M-00 Z5GHM
P42142-02 Z5GK
P42142M-02 Z5GKM
(TABLE *2.0) Power board:5VSTB Test Points
42" Models 5VSTB on Power board Confirmation Voltage
P42142-00 Z5GH Power K7B Pin3 5V
P42142M-00 Z5GHM
P42142-02 Z5GK
P42142M-02 Z5GKM
Page 1
Repair Flow Chart:Trouble Condition
Green Power is on, but LCD backlight is not on.
Backlight does not turn on, or only turns on and then off.
Power LED turns ON,
but LCD backlight is not ON
or only turns ON and then
OFF.
For Main board:
No:0V
Is the "BL_SW" voltage (3.3V)
Supplied from "K8B Pin13"?
Main board can not work.
Replace "Main board".
Yes:3.3V
For Power board:
No:over 0.8V
Is the 0V supplied from "K703 Pin13"
during LED on?
The Panel is broken.
Replace "Panel".
Yes:0V
For Power board: No:0V
Is the 24V in "K703 Pin 1/2/3/4/5"
Power board can not work.
Yes:24V Replace "Power board".
For Power board: No
Is the BL-SW voltage (3.3V) supplied
from "K703 Pin12"
Confirm wire harness connection
Yes:3.3V between Main board and Power board.
For Power board: No
Is the BL-ADJ wave (PWM)from
"K703 Pin11" normally?
Confirm wire harness connection
Yes between Power board and Main board .
The Panel is broken.
Replace the "Panel".
(TABLE *1.0) Main board: BL-SW Test Points
42" Models BL-SW on Main board Confirmation Voltage
P42142-00 Z5GH Main K8B Pin13 3.3V
P42142M-00 Z5GHM
P42142-02 Z5GK
P42142M-02 Z5GKM
(TABLE *2.0) Power board: BL-ERR Test Points
42" Models BL-ERR on Power board Confirmation Voltage
P42142-00 Z5GH Power K703 Pin13 0V
P42142M-00 Z5GHM
P42142-02 Z5GK
P42142M-02 Z5GKM
Page 2
(TABLE *3.0) Power board: 24V Test Points
42" Models 24V on Power board Confirmation Voltage
P42142-00 Z5GH Power K703 Pin1/2/3/4/5 24V
P42142M-00 Z5GHM
P42142-02 Z5GK
P42142M-02 Z5GKM
(TABLE *4.0) Power board: BL-SW Test Points
42" Models BL-SW on Power board Confirmation Voltage
P42142-00 Z5GH Power K703 Pin12 3.3V
P42142M-00 Z5GHM
P42142-02 Z5GK
P42142M-02 Z5GKM
(TABLE *5.0) Power board: BL-ADJ Test Points
42" Models BL-ADJ on Power board Confirmation Voltage
P42142-00 Z5GH Power K703 Pin11 PWM Wave
P42142M-00 Z5GHM
P42142-02 Z5GK
P42142M-02 Z5GKM
Repair Flow Chart:Trouble Condition
Green Power LED and LCD backlight is ON, but no video or OSD.
LCD backlight is ON,
but TV has NO VIDEO or OSD.
For Main board: No:0V
Is the 12V supplied from "K8B Pin 6/7"?
Replace"Power board" and
"Wire harness".
Yse:12V
No:0V or 1.1Vconstant
Is LVDS signal working?
(see TABLE*1.0)
Main board can not work.
Replace "Main board".
Yes
Confirm LVDS cable connection
and then check video or OSD again.
T-Con Board or LCD panel can not work. If LVDS signal output is OK, the Main board is
1st:Replace"T-Con Board&LVDS Cable". normally OK, but can not be sure. If
If T-Con board&LVDS cable has no the T-Con Board & LVDS has no problem,
problem, then 2nd:Replace"LCD Panel". please try the Main Board before changing
the panel.
(TABLE*1.0)Main board:"LVDS Clock"Test Points
42" Models LVDS Clock on Main board
P42142-00 Z5GH K5LV Pin10 clock+
P42142M-00 Z5GHM K5LV Pin8 clock-
P42142-02 Z5GK
P42142M-02 Z5GKM
Note:The bandwidth of the oscilloscope and probe must be at least 100MHZ or higher to check if the clock pulse exists.
Page 3
Repair Flow Chart:Trouble Condition
Power LED turns OFF within 10 seconds after the TV power turns on.
Power LED turns OFF within
10 seconds after TV power
turns on.
For Main board: No:0V
Is 3.3V supplied to"K8B Pin1"during
LED power on ?
Main board can not work.
Replace "Main board".
Yes:3.3V
Yes
Unplug cable from Main board
to T-Con board whether the
symptom changed?
T-Con board can not work.
Main board may also can not work.
Replace "T-Con board&Main board".
No
For Power board:
No:0V
Are the 12V and 24V supplied from "K7B Pin6/7&9 "
during LED power on?
Power board can not work.
Replace "Power board."
Yes
Main board can not work.
Replace "Main board ".
(TABLE *1.0) Main board: Power-on Test Points
42" Models Power-on on Main board Confirmation Voltage
P42142-00 Z5GH Main K8B Pin1 3.3V
P42142M-00 Z5GHM
P42142-02 Z5GK
P42142M-02 Z5GKM
(TABLE *2.0) Power board: 12V Test Points
42" Models 12V on Power board Confirmation Voltage
P42142-00 Z5GH Power K7B Pin6/7 12V
P42142M-00 Z5GHM
P42142-02 Z5GK
P42142M-02 Z5GKM
(TABLE *3.0) Power board: 24V Test Points
42" Models 24V on Power board Confirmation Voltage
P42142-00 Z5GH Power K7B Pin9 24V
P42142M-00 Z5GHM
P42142-02 Z5GK
P42142M-02 Z5GKM
Page 4
FILE No.
SERVICE MANUAL Remote Control Digital DP42142
Color Television (U.S.A.) (CANADA)
ORIGINAL VERSION
Chassis No. P42142-00
NOTE: Match the Chassis No. on
the unit's back cover with
the Chassis No. in the
Service Manual.
If the Original Version
Service Manual Chassis
No. does not match the
unit's, additional Service
Literature is required. You
must refer to "Notices" to
the Original Service
Manual prior to servicing
the unit.
Servicing should be performed by only trained and qualified service personnel.
Contents Specifications
SAFETY INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . 2 POWER RATING . . . . . . . . . . . . . . . . . . . . . . . . . 120VAC
SERVICE ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . 3 90 W (AVG.)
ON-SCREEN SERVICE MENU . . . . . . . . . . . . . . . . . . . . . 4 ANTENNA INPUT IMPEDANCE. . . . . . . . . . . . . . . . . 75
POWER FAILURE CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . 5 UHF/VHF/CATV
MECHANICAL DISASSEMBLY . . . . . . . . . . . . . . . . . . . . 6 DIGITAL
CHASSIS ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . 9
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