Toshiba 37AV502U - 37" LCD TV Service Manual Download Page 15

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+24Vinv/5.5A

+24Vaud/0.85A

+12V/2.2A

+5V/2.0A

S/OCP

Vcc

N.C.

GND

# Dim

# Inv

SECONDARY

PRIMARY

FSP145-4F04 FSP188-4F08

+24V 4.0A

+24Vaud 0.6A

+12V 2.0A

+5V 2.5A

+24V 5.5A

+24Vaud 0.85A

+12V 2.0A

+5V 2.0A

107

108

FSP145-4F03 FSP188-4F07

POWER [1] POWER

:12

:10

:11

F101

BD101

LF101

CY103

Y102

Y101

VA101

R213

U201

C208

R217

R216

101

R215

LF102

PC502

R530

Q501

R529

R125

R127

R126

R122

R124

R123

C116

R135

C201

C202

C203

D201

PC102

R201

R203

R205

R208

R209

R210

L202

C204

D202

C103

R121

R207

R211

R202

R206

R204

R212

R218

R133

C112

R132

C105

C106

C104

C111

R138

C108

R131

R139

C114

R130

C109

C107

R128

R140

C113

U101

101

R129

R134

C110

Q105

Vcc

T101

L203

C205

PC102

R221

R222

R220

Q201

C209

L201

Q103

Q104

R227

R225

R229

U202

R228

R226

L204

C207

C211

C210

R223

C503

D505

Q503

ZD501

R528

R527

C509

C504

PC501

502

C206

D203

R224

T501

FB502

R234

R233

C213

PC103

R137

C501

R521

D502

PC501

R522

C508

C506

C502

C505

Q502

C507

Q504

R523

R524

502

ZD503

D504

D503

R526

U501

D501

R525

PC103

R231

R230

R232

Q202

C212

P803

+24V

+12V

GND

P804

+24Vaud

+5V

P802

GND

PWR-ON

ACD

+24V

+12V

+5V

ACD

PWR-ON

GND

+24Vaud

R101

P801

D102

D103

D101

D105

D104

201

202

207

205

FB501

P801

T101

D204

CY104

101

ZD101

CY105

R235

C215

R236

C214

Vcc

TH101

R141

C101

C102

Q204

Q203

R219

R214

R237

208

D209

R238

R116

R117

R118

R119

R113

R112

R114

C115

R136

D106

Q106

R115

Q107

D111

R108

R107

R109

C117

R142

R110

D110

102

112

D109

R239

R240

FB503

C510

C216

102

101

C511

Q101

Q102

F101

BD101

LF101

CY103

Y102

Y101

VA101

R213

U201

C208

R217

R216

101

R215

LF102

PC502

R530

Q501

R529

R125

R127

R126

R122

R124

R123

C116

R135

C201

C202

C203

D201

PC102

R201

R203

R205

R208

R209

R210

L202

C204

D202

C103

R121

R207

R211

R202

R206

R204

R212

R218

R133

C112

R132

C105

C106

C104

C111

R138

C108

R131

R139

C114

R130

C109

C107

R128

R140

C113

U101

101

R129

R134

C110

Q105

Vcc

T101

L203

C205

PC102

R221

R222

R220

Q201

C209

L201

Q103

Q104

R227

R225

R229

U202

R228

R226

L204

C207

C211

C210

R223

C503

D505

Q503

ZD501

R528

R527

C509

C504

PC501

502

C206

D203

R224

T501

FB502

R234

R233

C213

PC103

R137

C501

R521

D502

PC501

R522

C508

C506

C502

C505

Q502

C507

Q504

R523

R524

502

ZD503

D504

D503

R526

U501

D501

R525

PC103

R231

R230

R232

Q202

C212

P803

+24V

+12V

GND

P804

+24Vaud

+5V

P802

GND

PWR-ON

ACD

+24V

+12V

+5V

ACD

PWR-ON

GND

+24Vaud

R101

P801

D102

D103

D101

D105

D104

201

202

207

205

FB501

P801

T101

D204

CY104

101

ZD101

CY105

R235

C215

R236

C214

Vcc

TH101

R141

C101

C102

Q204

Q203

R219

R214

R237

208

D209

R238

R116

R117

R118

R119

R113

R112

R114

C115

R136

D106

Q106

R115

Q107

D111

R108

R107

R109

C117

R142

R110

D110

102

112

D109

R239

R240

FB503

C510

C216

102

101

C511

Q101

Q102

Summary of Contents for 37AV502U - 37" LCD TV

Page 1: ... green product When repairing this green product use the part s described in this manual and lead free solder 2 For 1 and 2 refer to GREEN PRODUCT PROCUREMENT and LEAD FREE SOLDER TOSHIBA CORPORATION 2009 For Technical Bulletins Technical Tips or other information regarding the service of this model visit the Toshiba America Consumer Products National Service Division website at www7 toshiba com ...

Page 2: ... of this product The melting temperature of lead free solder is higher than that of leaded solder by 86ºF to 104ºF 30ºC to 40ºC Use of a soldering iron designed for lead based solders to repair product made with lead free solder may result in damage to the component and or PCB being soldered Great care should be made to ensure high quality soldering when servicing this product especially when sold...

Page 3: ...µF AC type capacitor between a known good earth ground water pipe conduit etc and the exposed metallic parts one at a time Measure the AC voltage across the combination of 1500 ohm resistor and 0 15 µF capacitor Reverse the AC plug at the AC outlet and repeat AC voltage measurements for each exposed metallic part Voltage measured must not exceed 0 3 volts rms This corresponds to 0 2 milliamps AC A...

Page 4: ...ct can adversely affect the performance Also use caution when handling the polarized screen because it can easily be damaged 4 If the panel surface becomes soiled wipe with cotton or a soft cloth If this does not remove the soiling breathe on the surface and then wipe again If the panel surface is extremely soiled wipe the panel surface with CRT cleaner sprayed onto the cloth Do not spray the clea...

Page 5: ...Do not store the LCD module below the temperature conditions described in the specifications Doing so could result in freezing of the liquid crystal loss of resilience or other damage 10 Do not disassemble the LCD module Such actions could result in improper operation 11 When transporting the LCD module do not use packing containing epoxy resin amine or silicon resin alcohol or oxim The gas genera...

Page 6: ...POWER_EN 13 BRT 13 BRT 18 GND 20 GND 14 POWER GOOD 14 POWER GOOD 14 IC 14 IC 19 Rx2 21 TxCLK 15 BL_BR_CNTRL 15 BL_BR_CNTRL 20 Rx2 Side IO board 22 EXT_VBR_B 16 BKLT_EN 16 BKLT_EN Inverter 12P Inverter 12P 21 GND 23 TxCLK 1 24Vinv 1 24Vinv 22 CLK Side IO board 2x3P Side IO board 2x3P 24 DCR_VBR_B 2 24Vinv 2 24Vinv 23 CLK 1 CVBS 1 GND 25 GND 3 24Vinv 3 24Vinv 24 GND 2 GND 2 R 26 LVDS_SEL 4 24Vinv 4 ...

Page 7: ...el out Main Board HDMI 1 Composite IN Keypad IR Audio AMP TPA3121D2 I2S out Audio I2S input SIF Tuner_CVBS IF P N LVDS out R_out L_out S PDIF CVBS Y C input Pr Pb Y Audio IN OUT SPDIF OUT 24LC02 Pr Pb Y R L output CVBS UR HD SW BA7657 Audio I2S output MCU WT61P7 24LC02 COLOR STREAM HD1 IN COLOR STREAM HD2 IN ANT CABLE TX RX Service 6 ...

Page 8: ...Power PCB Main PCB Inverter PCB 32AV502U P801 Lamp Out CN13 Not used in later production CN10 Tuner P803 P802 CN12 CN11 CN3 CN7 CN101 LVDS Alt LVDS 26 in 7 ...

Page 9: ...3 24V Aud 4 24V Aud 5 Gnd 6 Gnd 7 Gnd 8 12V 9 12V 10 5V 11 5V 12 5V 13 Pwr On 4 3V 14 AC Det 07V 15 Dim 2 to 4V 16 BL On 5V AC In Power Supply In Out Speakers LED IR 1 LED G 2 LED B 3 Gnd 4 3 3V 5 IR 6 5V Manual Key 1 Pwr 2 CH 3 CH 4 V 5 V 6 Menu 7 Source 8 Gnd LVDS Alt LVDS 26 in Side AV In 1 CVBS 2 Gnd 3 Gnd 4 L Aud 5 R Aud Wiring Interconnect 26 32 37AV502U 26 37AV52U Key Pin 1 Flow out in Indi...

Page 10: ... supply on the power supply supply module No Is the Power Good AC Detect level less than 07V at pin 14 of P802 when AC is applied Yes No Suspect a problem with the power supply module Does the secondary 12 volt source appear at pin 8 of P802 when the on off button is pressed No No Suspect a problem with the SYSCON circuit located on the Main module Yes Yes Suspect a problem with the Main module De...

Page 11: ...ES NO Troubleshoot for backlight problelms Is the screen discolored or does it have streaks or dark areas with no signal input NO If the LCD Control Board is available try it If this does not help replace the LCD display panel YES Examples Warranty Authorization required if display is replaced in warranty Go to www7 toshiba com for instructions Check for LVDS activity at CN5 If it is present suspe...

Page 12: ...ce the Power supply module Is 5VDC present at pin 16 of P802 soon 5 sec after the unit is turned on YES NO If it is available try one or both inverters If this does not help replace the LCD display Warranty Authorization required if display is replaced in warranty Go to www7 toshiba com for instructions Backlight Troubleshooting Replace the Main module 11 ...

Page 13: ...re on and the input selection is a known good source Will this restore audio Does the power supply generate the audio supply voltages 24 VDC at pins 3 and 4 of P802 when the unit is turned on YES NO Replace the power supply module YES NO Replace the Main module Problem solved No Audio 12 ...

Page 14: ...t the Toshiba website at www7 toshiba com for the latest update information Factory Mode The factory mode necessary adjustments and update procedures shown below can be accessed in this unit using the supplied remote control transmitter To access the factory mode you must press Left Arrow Exit Enter in sequence on the remote transmitter The mode can be exited by pressing exit or simply turning the...

Page 15: ... S2 S4 S4 D102 D103 D101 D105 D104 ZD201 ZD202 D207 D205 FB501 P801 P801 T101 P4 D204 CY104 CX101 ZD101 CY105 R235 C215 R236 C214 Vcc TH101 R141 C101 C102 Q204 Q203 R219 R214 R237 D208 D209 R238 R116 R117 R118 R119 R113 R112 R114 C115 R136 D106 Q106 R115 Q107 D111 R108 R107 R109 C117 R142 R110 P5 P5 P6 D110 ZD102 D112 P6 D109 S5 R239 R240 S5 C118 FB503 C510 C216 VS102 VS101 C511 Q101 Q102 F101 BD1...

Page 16: ... 75012770 PC BOARD ASSY KEY B 37AV502U 39C02051L06 E261 75012771 PC BOARD ASSY IR B 37AV502U 39C02051L07 E300 75011157 LCD PANEL LC370WXN SAC1 E310 75012777 H CON SET TW37T MB LVDS LGS 39C02051L13 E320 75012780 POWER CORD 37AV502U 39C02051L03 E330 75012773 SPEAKER ASSY 10W 6OHM 37AV502U 39C02051L09 E340 75012774 H CON SET TW37T MB CN11 CN10 39C02051L10 E341 75012775 H CON SET TW37T MB CN12 IR 6 39...

Page 17: ...TOSHIBA CORPORATION 1 1 SHIBAURA 1 CHOME MINATO KU TOKYO 105 8001 JAPAN ...

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Toshiba 37AV502U - 37" LCD TV, Service Manual

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