Toshiba 26AV502U - 26" LCD TV Service Manual Download

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SERVICE MANUAL

LCD Color Television

26A

v.1

This model is classified as a

green product

(*1), as indicated by the underlined serial number.

This Service Manual describes replacement parts for the 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

200

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

Summary of Contents for 26AV502U - 26" 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 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 5 ...

Page 7: ...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 8: ...26 32 37AV502U 26 37AV52U Wiring Interconnect P802 P803 P801 LCD Panel Power Board P802 L V D S I n 7 ...

Page 9: ...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 8 ...

Page 10: ...801 P801 T101 P4 D204 CY104 CX101 ZD101 CY105 R235 C215 R236 C214 Vcc TH101 R141 C101 R101 Q204 Q203 R219 R214 R237 D206 D208 P4 R113 R112 R114 C115 R136 D106 Q106 D107 D108 R115 Q107 D111 R108 R107 R109 C117 R142 R110 P5 D110 ZD102 D112 P6 D109 P5 P6 R116 R117 R118 R119 C202 R238 C118 FB503 C510 VS102 VS101 C511 Q101 Q102 F101 BD101 LF101 LF101 CY103 CY102 CY101 VA101 R213 U201 C208 R217 R216 PC1...

Page 11: ...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 Dea...

Page 12: ...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 13: ...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 12 ...

Page 14: ...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 13 ...

Page 15: ...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 16: ... B 37AV502U 39C02051L06 E261 75012771 PC BOARD ASSY IR B 37AV502U 39C02051L07 E300 75012350 LCD PANEL V260B1 L11 E310 75012911 CABLE LVDS FFC 30P G P1 PAD0 65 2 39C02251L06 E320 75012780 POWER CORD 37AV502U 39C02051L03 E330 75012906 SPEAKER ASSY 5W 6OHM 160X40X41 39C02251L12 E340 75012778 H CON SET STW46T MB POW 12V 39C02451L11 E341 75012907 H CON SET STW26T INV POW 14P 39C02251L11 E342 75012924 H...

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

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