Sony KV-TF21M61, KV-TF21P11, KV-PF21M70 service manual SELF-DIAGNOSTIC Circuit, +BÊovercurrentÊ»OCP¼

Page 7

KV-PF21M70/TF21M61/TF21M90/TF21P11

RM-952

6.SELF-DIAGNOSTIC CIRCUIT

 

 

 

 

IC301

 

IC001

 

 

 

 

 

 

IC003

 

 

Y/CHROMA JUNGLE

 

SYSTEM

 

 

 

 

 

 

MEMORY

FROM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

21

IK-IN

 

 

 

IO-8DAT

45

 

 

 

5 B-DAT

CRT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FROM

 

 

 

MP/

 

 

 

O-LED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[+B] Q604 C5/C3

 

18

 

 

 

51

 

 

 

 

 

 

PROTECT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SDA 35

 

46 IO-SDAT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[V]Q509/507

[+BÊovercurrentÊ»OCP¼]

Occurs when an overcurrent on the +B(135) line is detected by Q604. If Q604 go to ON

 

and the voltage to pin 18 of IC301 should go down when V.SYNC is more than seven

 

verticals in a period, the unit will automatically turn off.

[VerticalÊdeflectionÊstopped]

Occurs when an absence of the vertical deflection pulse is detected by Q509 and IC001

 

shut down the power supply.

[VerticalÊdeflectionÊovercurrent]

Occurs when an overcurrent on V drive line is detected by Q507. Power supply will be

 

shut down when detect this by IC001.

[WhiteÊbalanceÊfailure]

If the RGB levels* do not balance or become low level within 5 seconds, this error will be

 

detected by IC301. TV will stay on, but there will be no picture.

 

* (Refers to the RGB levels of the AKB detection Ref pulse that detects IK.)

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Contents KV-TF21M61 KV-PF21M70 KV-TF21M90 KV-TF21P11 BG-3SCHASSISKV-PF21M70/TF21M61/TF21M90/TF21P11 SpecificationsCircuit Adjustments Table of ContentsDisassembly SET-UP AdjustmentsDiagnostic Test Indicators Self Diagnostic FunctionStopping the STANDBY/TIMER Flash Display of STANDBY/TIMER Light Flash CountHandling of SELF-DIAGNOSTIC Screen Display SELF-DIAGNOSTIC Screen Display+BÊovercurrentÊ»OCP¼ SELF-DIAGNOSTIC CircuitConnect the antenna Getting StartedInsert the batteries into the remote Connecting optional componentsPreset the channels automatically Connecting video equipment using the ò Monitor output jacksPresetting channels automatically Presetting channelsSecuring the TV Skipping program numbers Presetting channels manuallyAdditional tasks Watching the TVChanging the on-screen display language Selecting the picture and sound modes Setting the Wake Up timerSetting the Sleep timer Customizing the picture and soundBlocking the channels Adjusting the picture and sound settingsIndicator flashes Self-diagnosis function TroubleshootingCount the number of times the u indicator flashes Press U main power to turn off your TVTroubleshooting Identifying parts and controls Remote ControlFront panel KV-TF21M61/TF21M90 PF21M70/TF21M61/TF21M90/TF21P11 RM-952 VHF LOW Auto I D/K M PIC Rotation Press U to turn on the TV. When the TV isRepeatedly until you get Appears Press + or to select Desired surround sound Selecting the surround modePress Select repeatedly Until SurroundPress A/B repeatedly until you receive the sound you want Selecting a stereo or bilingual programAdditional Teletext tasks Using FastextViewing Teletext Displaying TeletextAdditional Self-diagnosis functionCheck the antenna direction Troubleshooting ShortcutsCheck connection on the AC socket Press ü + to increase the volume level Select button 2headphone jack Front panel KV-PF21M70/TF21M61/TF21M90/TF21P11Jump Sound Progr KV-TF21P11 Your Securing the TV Number buttons until Appears Press + or Press Progr +/- orDesired program number appears Language / English Your New Picture PF21M70/TF21M61/TF21M90/TF21P11 RM-952 KV-PF21M70/TF21M61/TF21M90/TF21P11 Press U main power to turn off your TV Indicator flashesPF21M70/TF21M61/TF21M90/TF21P11 RM-952 Sound Progr Mode Chassis Assy Removal Rear Cover RemovalBracket Removal KV-TF21M61/TF21M90 Replacement of Parts Service PositionTerminal Bracket Removal Picture Tube Removal Degauss Coil Removal∙ HOW to Handle AN ANODE-CAP ∙ Removal of ANODE-CAP ∙ Removing ProceduresBeam Landing Section SET-UP AdjustmentsHorizontal and Vertical Static Convergence ConvergenceYCH TLV G2 Screen and White Balance Adjustments Focus AdjustmentRM-952 Adjustments with CommanderAdjustment Method Adjustment Item Table INF INS TXT OPM OPB KV-PF21M70/TF21M61/TF21M90/TF21P11 Board Adjustment After IC003 Memory Replacement Picture Quality Adjustments SUB Color AdjustmentSUB HUE Adjustment Bell Filter AdjustmentItem Number 00 0B Picture Distortion AdjustmentSTV5112 TU101 BTF-WG441IIC201 TA8248KSecam Schematic Diagrams and Printed Wiring BoardsBoard IC001 CXP86449-623S DTC114EK SemiconductorsBeznet Assy REF. NO. Part no Description19 4-057-714-01 Piece ASSY, TLH Correction BUTTON, Multi BUTTON, PowerREF. NO. Part no Description Remark Beznet Assy KV-TF21P11HOLDER, FBT Description RemarkElect HOLDER, LEDMylar Elect 1MFCarbon CeramicPLUG, Connector 3P Diode PIN, Connector 4PPLUG, Connector 3P PLUG, Connector 6P100 101 Metal Chip 102Metal 103 VIBRATOR, Ceramic 104Tuner TUNER, FSS BTF-LG433 CrystalOnly 105106 Diode RD10SB 107Photo Coupler ON3171-R IC Link 108Transistor 2SC2712-YG 109 110 111 Carbon Variable Resistor 112SOCKET, CRT Coil Transistor 2SC2611113 C5 Except KV-PF21M70114 115 116

KV-PF21M70, KV-TF21P11, KV-TF21M61 specifications

The Sony KV-TF21M61, KV-TF21P11, and KV-PF21M70 are iconic television models that hold a significant place in the history of consumer electronics. These CRT (cathode-ray tube) televisions were introduced during a time when home entertainment was evolving, showcasing Sony's dedication to delivering high-quality viewing experiences.

The KV-TF21M61 is known for its compact design and impressive image quality, featuring a 21-inch screen size that was perfect for small to medium-sized rooms. Equipped with Sony's advanced Trinitron technology, it delivers vibrant colors and sharp images, making it a favorite among viewers who appreciate clarity and detail. The television features a built-in tuner, allowing users to easily access various TV channels without the need for an external set-top box. The design includes multiple connectivity options, including standard composite inputs, offering versatility for connecting gaming consoles and DVD players.

Similarly, the KV-TF21P11 model carries forward Sony's commitment to exceptional picture quality. With anti-glare screens and enhanced viewing angles, this model ensures that viewers enjoy clear images from different positions in the room. Its user-friendly interface allows easy navigation through channel selections and picture adjustments. The model also includes stereo speakers, providing a richer audio experience that complements the stunning visuals.

On the other hand, the KV-PF21M70 is seen as an evolution of these models, featuring a larger display while retaining the core technological advancements of its predecessors. This unit incorporates Sony's Picture-in-Picture (PiP) feature, allowing users to watch two channels simultaneously or view external input while keeping an eye on live TV. This functionality enhances versatility and user engagement, making it a practical choice for avid viewers who don’t want to miss out on their favorite programs.

All three models are equipped with various sound enhancement features, including bass and treble controls, ensuring users can tailor their audio experience according to their preferences. The robust build quality and reliability typical of Sony products ensure that these televisions remain cherished items even as technology progresses and newer formats emerge.

Overall, the KV-TF21M61, KV-TF21P11, and KV-PF21M70 are more than just old CRT televisions; they represent a significant era in television technology, characterized by brilliant visuals, sound quality, and functional designs that laid the groundwork for modern home entertainment systems. These models remain a testament to Sony's pioneering efforts in the realm of consumer electronics.