sanyo 17mb22 training
TRANSCRIPT
IDTV
CE37LD81-B CE42LD81-B
SANYO LCD TV
OVERVIEW &
FAULT DIAGNOSIS
17MB22 Chassis
SANYO LCD TV 2007-8
Models: CE37LD81-B, CE42LD81-B
PCB Spares Listing
For the 2007-8 SANYO TV, ordering of spare parts needs reference taken not only of the TV model number i.e. CE37LD81-B but also of the actual production code of that particular model. On occasions the same model number could have a different particular pcb or a different manufacturer or revision of LCD panel fitted. The production code could be viewed similarly to previous models whereby production changes were notified by use of a different service code i.e. CE32LD6-B-01. The production code can be easily found on the rating plate on the TV back cabinet under the Model number and 2 bar codes as seen below.
TV RATING PLATE On back of set
Production Code
Identification of Production Code (26” Example)
The correct production code must be used to locate the correct part numbers, otherwise incorrect parts may be supplied. If a particular production code is not listed, you must contact technical support for advice before ordering any parts.
Main Part Numbers for CE37LC81-B, CE42LD81-B
CE42LD81-B Prod Code Model 10049155 17MB22 42781 SANYO SANYO-CE42LD81-B
Power Board 20301443 MD.ASY.17PW16-2-42" TFT 170-270V(W/CABLE
FAV Board 20309015 MD.ASY.17FAV14-AV/HP/SV/LO/SPDIF(MB22)
LED Board 20315065 MD.ASY.17LD55-37-40781(MB15)
Key Board 20345995 MD.ASY.17TK83S-6SW 37-42750/51 (MB22)
R/C 20328881 R/C 1050 SANYO (GRAY/S)
Right Speaker 20308713 SPK.ASY.42720TFT(MB11/15-L/MB22-R)JIEFU
Left Speaker 20308712 SPK.ASY.42720TFT(MB11/15-R/MB22-L)JIEFU
Panel 30052454 TFT LCD 42"W LG LC420WX5-SLA1 SAFE RoHS
Chasis 20347999 CHS.ASSY.17MB22-21112222422531221148
LVDS Cable 30058240 CNAS 30P/350 MB22LVDSUL20276 AWG30RoHS
CE37LD81-B Prod Code Model 10047951 17MB22 37781 SANYO SANYO CE37LD81-B
Power Board 20319694 MD.ASY.17PW20-37" TFT 170-270V
FAV Board 20309015 MD.ASY.17FAV14-AV/HP/SV/LO/SPDIF(MB22)
LED Board 20315065 MD.ASY.17LD55-37-40781(MB15)
Key Board 20345995 MD.ASY.17TK83S-6SW 37-42750/51 (MB22)
R/C 20328881 R/C 1050 SANYO (GRAY/S)
Right Speaker 20308713 SPK.ASY.42720TFT(MB11/15-L/MB22-R)JIEFU
Left Speaker 20308712 SPK.ASY.42720TFT(MB11/15-R/MB22-L)JIEFU
Panel 30044228 TFT LCD 37''W LG LC370WX1-SL01SAFE RoHS
Chasis 20337555 CHS.ASSY.17MB22-21112222422531221147
LVDS Cable 30048584 CNAS 30P/230 LVDSW/FER UL20276 AWG30RoHS
Model Inverter (LIPS) Display Ctrl Pcb (Top rear of LCD panel)
Pt. No. Pt. No. CE37LD81-B MASTER 30048243 30054730 SLAVE 30048244 CE42LD81-B MASTER 30054783 30054729 SLAVE 30059001
Inverter and LCD Panel Control Pcbs are normally part of the complete LCD Panel SANYO will supply separately subject to availability.
Signal Pcb (Chassis) Identification (42” Example)
Cabinet Back Rear Label
Production Code
Part Number
LCD Panel Size
Main (Chassis) Pcb
LCD Panel Manufacturer (LG in this example)
• LCD Display Panel Replaceable only with prior TECHNICAL AUTHORISATION.
Inverter (Back Light) Pcb
Display Control Pcb (fitted inside rear of LCD Panel) (Both supplied as part of LCD Panel but available as spare separately).
• Signal Pcb - spares name - Chassis
• RCU / LED Pcb - spares name - LED Board
• Digital Freeview Pcb - spares name - DTT Board
• Power Supply Pcb - spares name - Power Board
• HDMI Pcb - spares name - HDMI Input Board
• AV Pcb - spares name - FAV Board
• Key Pcb - spares name - Key Board
TV Model: CE37LD81-B
GENERIC USE ONLY - CONSULT PARTS LIST FOR APPROPRIATE MODEL
Master Inverter
Signal Pcb (Audio/ Video / CPU & Scaler)
Power Supply Pcb Digital Freeview Pcb
RCU & LED Pcb
HDMI Pcb
Key Pcb
AV Pcb
Slave Inverter
Display Control Pcb
C902
PL809 AC IN
F800T2.5A
PL803 to Signal PL003 PL805 to PL002 Signal Pcb +24V to PL001 Signal Pcb
PL804 to Digital Pcb
37" POWER SUPPLY PCB
12V Run
3v3 5V Standby
4v9 3v3Run Supplies
PL802 to Master Inverter
Run Supplies
32V Stby34V Run
11v9 Run3v2 2v5 2v51v7 Stby0.6V Run
+24V 2v3 3v2Run Supplies
CE37LD81-B POWER SUPPLY PCB
Run Supplies
TR803STANDBYSUPPLIES
TR806RESONANT
CHOKE
PL811 to Standby button
7.8V (pulsing) Standby (front LED lit)0V Side Standby Key button pressed in
All other Voltages shown are with reference to the isolated metal chassis
TR805
RUN SUPPLIES
+
390V Run340v StbyREF UNISOLATED GROUND
Note :- This model has a low power mode, which switches off the CPU standby supplies and front LED, when the latching side standby key button is pressed. (The TV will appear completely 'Dead' and cannot not be operated by the RCU).In this mode 340VDC is still supplied by the bridge rectifier to the unisolated primary components, which are still Live..
PL801+24V Run to Slave Inverter
To PL302Digital Pcb
PL602 to LED / RCU Pcb
37" Signal Processing17MB22
TU100Combined UHF /
VHF / CATV Analogue & Digital
TunerPC
AUDIN Y Pb Pr L
AUDR
AUD
RGB, Composite Video inComposite Video Mon out
SCART 1
RGB, Composite Video inSVHS INSCART 2
L/SL/SFPC connector to Digital PcbAudio, Video & Control Bus
PL406
IF out to DigitalPcb
PL403 toKeypad Pcb
2 x HDMI 1.1 Pcb
Pc Input
To PL104 FAV Pcb
PL002 to PSU PL805 PL003 to PSU PL803
Component Video / Audio Inputs SrvPort
Service Port To Digital Pcb(LD Only)
IC400VCTP
Main CPU, VideoTXT, Audio, Scaler
IC702HDMI 1.1
LVDS Drives & Clocks measure 200mv on 100MHz Scope using x 10 probe.These may be very low or look non existent on a low bandwidth scopeIf all LVDS drives are present, the clock signals can be assumed to be OK.(See LVDS / Clock waveform pages)
12V LCD Panel Supplies
- + - + - + CLK - + LVDS Drives to LCD Panel
PL206
IC 101AGC
IC100Analogue
IF & CVBS out
IC405Sync
Switch
IC200
PC in
PL411
PL001 To PL801 PSU
11V9Run
32V Stby34V Run 1V7 Stby
0.6V Run
3V2Run
2v5Run
2V5Run
5VStby
3V3Stby
4V9Run
3V3 Run
IC601Audio Output
IC903RGB
IC902VideoSwitch
IC904AudioSwitch
IC905AudioSW
To PL205FAV Pcb
To PL204FAV Pcb
24VRun
IC001
3V3Stby
1V8Stby
0.6V Stby
IC00412V Run
10V5 Run 9.1VRun
CE37LD81-B SIGNAL PCB
Side Key PressNorm = 3v3
AV = 2VMenu = 0.56VCH+ = 1VCH - + 2v3Vol + = 1v6Vol - = 0.19V
IC 403NVM(64K)
LED 4v3 Run3v2 Stby3v9 (Dips with RCU)Always +5V
PL207
• LCD Display Panel Replaceable only with prior TECHNICAL AUTHORISATION.
Inverter (Back Light) Pcb
Display Control Pcb (fitted inside rear of LCD Panel) (Both supplied as part of LCD Panel but available as spare separately).
• Signal Pcb - spares name - Chassis
• RCU / LED Pcb - spares name - LED Board
• Digital Freeview Pcb - spares name - DTT Board
• Power Supply Pcb - spares name - Power Board
• HDMI Pcb - spares name - HDMI Input Board
• AV Pcb - spares name - FAV Board
• Key Pcb - spares name - Key Board
TV Model: CE42LD81-B
GENERIC USE ONLY - CONSULT PARTS LIST FOR APPROPRIATE MODEL
Master Inverter
Signal Pcb (Audio/ Video / CPU & Scaler)
Power Supply Pcb Digital Freeview Pcb
RCU & LED Pcb
HDMI Pcb
Key Pcb
AV Pcb
Slave Inverter
Display Control Pcb
C902
PL809 AC IN
F800T2.5A
PL803 to Signal PL003 PL805 to PL002 Signal Pcb24V to PL001 Signal Pcb
42" POWER SUPPLY PCB
3v3 5V Standby
4v9 3v3Run Supplies
PL802 to Inverter Pcb
Run Supplies
34V Run32v Stby
11v9 Run3v2 1.7V Stby 0.6V Run
+24V
CE42LD81-B POWER SUPPLY PCB
Run Supplies
2v7
TR803STANDBYSUPPLIES
TR806RESONANT
CHOKE
2v7
TR805
RUNSUPPLIES
PL807 to Digital Pcb
12V RunPL811 to Standby button
8V (pulsimg) Standby (front LED lit)0V Side Standby Key button pressed in
+24V Run to Inverter
Note :- This model has a low power mode, which switches off the CPU standby supplies and front LED, when the latching side standby key button is pressed. (The TV will appear completely 'Dead' and cannot not be operated by the RCU).In this mode 340VDC is still supplied by the bridge rectifier to the unisolated primary components, which are still Live.
+
PL801
2v5
2v7 3v2
390V Run340v StbyREF UNISOLATED GROUND
All other Voltages shown are with reference to the isolated matal chassis
To PL302Digital Pcb
PL602 to LED / RCU Pcb
42" Signal Processing17MB22
TU100Combined UHF /
VHF / CATV Analogue & Digital
TunerPC
AUDIN Y Pb Pr L
AUDR
AUD
RGB, Composite Video inComposite Video Mon out
SCART 1
RGB, Composite Video inSVHS INSCART 2
L/SL/SFPC connector to Digital PcbAudio, Video & Control Bus
PL406
IF out to DigitalPcb
PL403 toKeypad Pcb
2 x HDMI 1.1 Pcb
Pc Input
To PL104 FAV Pcb
PL002 to PSU PL805 PL003 to PSU PL803
Component Video / Audio Inputs SrvPort
Service Port To Digital Pcb(LD Only)
IC400VCTP
Main CPU, VideoTXT, Audio, Scaler
IC702HDMI 1.1
LVDS Drives & Clocks measure 200mv on 100MHz Scope using x 10 probe.These may be very low or look non existent on a low bandwidth scopeIf all LVDS drives are present, the clock signals can be assumed to be OK.(See LVDS / Clock waveform pages)
12V LCD Panel Supplies
- + - + - + CLK - + LVDS Drives to LCD Panel
PL206
IC 101AGC
IC100Analogue
IF & CVBS out
IC405Sync
Switch
IC200
PC in
PL411
PL001 To PL801 PSU
11V9Run
32V Stby34V Run 1.7V Stby
0.6V Run
3V2Run
2v7Run
2V5Run
5VStby
3V3Stby
4V9Run
3V3 Run
IC601Audio Output
IC903RGB
IC902VideoSwitch
IC904AudioSwitch
IC905AudioSW
To PL205FAV Pcb
To PL204FAV Pcb
24VRun
IC001
3V3Stby
1V8Stby
0.6V Stby
IC00412V Run
10V5 Run 9.1VRun
CE42LD81-B SIGNAL PCB
Side Key PressNorm = 3v3
AV = 2VMenu = 0.56VCH+ = 1VCH - + 2v3Vol + = 1v6Vol - = 0.19V
IC 403NVM(64K)
LED 4v3 Run3v2 Stby3v9 (Dips with RCU)Always +5V
PL207
PL400Ground to PL802PSU
Digital Freeview Decoder
Card Reader
PL202 FPC to Signal PCB PL207
To Signal PCB (IF IN)
+12V from PL804 PSU
SPDIF out toFAV Pcb
From Signal Pcb Service Port
PL103
PL302PL501
PL102
IC 101
IC202
Audio / Video / Control Bus The Digital IF signal is fed into PL302 from the combined Analogue / Digital tuner assembly on the signal Pcb on the 'D' series models.
The +12V power to PL501 is always present from plug PL804 on the main power supply.
PL102 is connected to the Signal Pcb service port, by PL411 and allows firmware updates to the Digital Processor IC.
The FPC, flexible printed circuit connector from PL202, allows Audio & Video data and also control bus operation from PL207 on the signal Pcb.
PL103 supplies the SPDIF (Sony Philips Digital Interface) signal to the FAV Pcb for connection to external equipment
UHF-VHF-CATV- DIGITAL TUNER ASSEMBLY
TU100
0V0V33.7V1.5V5V5V4V Varying with signal4V Varying with signal0V1.7V0.05V
All voltages measured in RUN mode with normal off air signal.
Low Voltage Difference Signal Waveforms
Figure 1 – Negative LVDS waveform example This waveform is an example of the differential signal which may be observed on the LVDS output plug. See Signal Pcb Diagram for specific pins. All negative pulses should be similar in amplitude and frequency (70-80Mhz). The signal has a DC level of between 1.125V and 1.375V depending upon the type of input signal.
Figure 2 – Positive LVDS waveform example This waveform compliments the negative version shown above; See Signal Pcb Diagram for specific pins. All positive pulses should be similar in amplitude and frequency (70-80Mhz). The signal has a DC level of between 1.125V and 1.375V depending upon the type of input signal.
Low Voltage Difference Signal Clock Waveforms
Figure 3 – LVDS clock waveform This waveform should be present in both positive and negative form on the LVDS output plug . See the Signal Pcb Diagram for specific pins. The clock frequency is specified as 74.25MHz but may be anywhere between 70MHz and 80MHz. The waveform has an offset of approximately 1V DC.
The LVDS clock waveforms Please note that there are normally two of these clock signals present and as these are 70-80Mhz waveforms they may look to be non existent or very low in amplitude if a low bandwidth oscilloscope is used. i.e. 20-50MHz. An 80-100Mhz Bandwidth oscilloscope will be required to display the correct Clock And LVDS drive signal amplitudes. If a higher bandwidth oscilloscope is not available and all other LVDS drive signals are present, then these two clock signals can be assumed to be OK.
NO SOUND OR PICTURE
Yes No
FAULTY SOUND - PICTURE OK
Dead Set or Stuck in Standby
Is front LED lit
Check 340V across C902 on PSU. If OK, Unplug side key standby button from PL811 on PSU. If TV operates OK. Replace Button. If no 340V, check T2.5A fuse on PSU. If fuse is blown and blows again, replace PSU.
If fuses OK, check for 240V AC at PL809 on PSU. If not present, check the mains lead & plug fuse.
If 240V AC Ok , check PSU Standby voltages at signal Pcb plugs PL002 and PL003.(See Signal Pcb diagram).
If voltages OK replace Signal Pcb. If incorrect then replace the PSU.
Check with RCU, if set comes on replace the TV Keypad Pcb.
If set comes on via the keypad, but not the RCU, then check the RCU and if OK, replace the LED / RCU Pcb.(see signal Pcb diagram PL602 for voltages)
Check Signal Pcb for all correct Standby voltages at PL002 and PL003. (See Signal PCB Diagram).
If incorrect check wiring to PSU, If OK, replace PSU PCB.
If OK replace the Signal Pcb.
No or Distorted Sound Output from all Sources
Check all Run voltage supplies from PSU at the Signal Pcb (See Signal Pcb Diagram)
If incorrect check PSU suppliesIf all OK. Replace faulty loudspeaker, or replace Signal Pcb.
Yes No
Yes No
NO PICTURE - NO OSD - SOUND OK
Are Backlights Lit ?
No Picture from TVor any AV inputs. No OSD. Sound OK
Check all voltages to the Inverter Pcb at PSU PL801 / PL802 and Run voltages at PL803 & PL805. (See PSU diagram)
If all voltages from the PSU are OK, check the inverter Pcbs for D/J or replace.
If after replacing the inverter Pcb, the backlights are still not lit, then one or more of the backlight lamps could be faulty.
If PSU voltages are incorrect, then replace PSU Pcb.
Check the five LCD panel +Ve supplies at Main Pcb LVDS LCD panel connector PL406.(See Signal Pcb diagram).
Also check all eight LVDS and two CLK waveforms with scope at LCD panel connector. (see Signal Pcb and LVDS diagrams)
If OK, do continuity check on LVDS cable.
If cable OK, try replacement display control pcb (top rear of LCD panel under metal cover). If still faulty then replace the LCD Panel assy.
If voltages / waveforms not OK then check all supplies on the Signal Pcb at PL002 and PL003. (see Signal Pcb diagram). If voltages OK, replace the Signal Pcb.
If voltages incorrect replace the PSU
If one channel of either of the inverters is not functioning due to a faulty inverter Pcb or a faulty lamp, then the backlights will light initially and then the inverter board will shut down with no picture, but the sound will still be present if previously tuned in.
Produced in the UK by
Mike Burnett Senior Technical Liaison & Training Engineer
SANYO Europe Ltd