Tuesday, 29 December 2020

Vestel 17IPS62-R4 LED TV Power Supply and Philco PH32M LED TV SMPS schematics

 

Attention to this Vestel schematic;  it seems to me that most of them are unfinished versions. 

The value of many components has nothing to do with what's on the board. 

For example one of the several errors R57, R58, R98 (3 resistors in series) in the scheme has 10R on the board has 3 X 39K, if the value of the schematic is placed,  it will make fire. It is therefore necessary to be very careful with Vestel schemes.

Used with: Toshiba 32W3863DB, Turbo-X TXV 3230D, Linsar 32LED1600, Telefunken TE3228, Telefunken TE32SMB35Z2D, Finlux 32-FFA-5615, Hitachi 32HB6J41U, JVC LY-39C770, Panasonic TX32DW334, Toshiba 32W1333DB, 32D1334DB, Hitachi 32HB6J51U and many other brand models.

Vestel 17IPS62-R4 LED TV Power Supply


SCHEMATIC PART TO BE NOTED:


Philco PH32M LED TV SMPS schematic


Sunday, 20 December 2020

How to enter the service mode of JVC AV32H20EUS, AV28H20EUS, and AV28H20EUB – FULL DETAILS OF ALL ADJUSTMENTS

 It makes sense to avoid exposure to electrical shock.  While some sources are expected to have a possible dangerous impact, others of quite high potential are of limited current and are sometimes held in less regard.

Color System:  PAL - SECAM - NTSC (Only in EXT mode)

Stereo System:  A2 (B-G,D-K)/ NICAM (B-G,I,D-K,L)

Teletext System

 FLOF (Fastext)

TOP (German system)

WST (W world Standard system)

Power Input:  220 – 240 V AC, 50Hz

Power consumption:  187W(Max) / 138W(Avg), standby : 2.6W

21-pin Euro connector (SCART socket) : EXT-1 - EXT-2 - EXT-3



[Don't short between the LIVE side ground and ISOLATED (NEUTRAL) side ground or EARTH side ground when repairing.]

REPLACEMENT OF MEMORY ICs

(1) Power off

Switch the power off and unplug the power cord from the outlet.

(2) Replace ICs.

Be sure to use memory ICs written with the initial data values.

(3) Power on

Plug the power cord into the outlet and switch the power on.

(4) Check and set SYSTEM CONSTANT SET :

* It must not adjust without signal.

1) Press the INFORMATION key and the MUTING key of the REMOTE CONTROL UNIT simultaneously.

2) The SERVICE MENU screen of Fig. 1 will be displayed.

3) While the SERVICE MENU is displayed, press the

INFORMATION key and MUTING key simultaneously, and the

SYSTEM CONSTANT SET screen of Fig. 2 will be displayed.

4) Check the setting values of the SYSTEM CONSTANT SET.

 If the value is different, select the setting item with the FUNCTION UP-DOWN key, and set the correct value with the FUNCTION --+ key.

5) Press the MENU key to memorize the setting value.

6) Press the INFORMATION key twice, and return to the normal screen.

(5) Setting of receive channels

Set the receive channel.  For setting, refer to the OPERATING INSTRUCTIONS.

(6) User settings

Check the user setting values of Table 2, and if setting value is different, set the correct value.  For setting, refer to the OPERATING INSTRUCTIONS.

(7) Setting of SERVICE MENU

Verify the setting items of the SERVICE MENU of Table 3, and reset where necessary.  For setting, refer to the SERVICE ADJUSTMENTS.


SERVICE ADJUSTMENTS

NB:  Never touch parts (such as variable resistors, transformers and condensers) not shown in the adjustment items of this service adjustment.


SERVICE MENU

Operate the SERVICE MENU with the REMOTE CONTROL UNIT.

SERVICE MENU ITEMS

With the SERVICE MENU, various settings (adjustments) can be made, and they are broadly classified in the following items of settings

(Adjustments):

(1) 1. IF・・・・・・・・・・・・・・・・・・・・・・・ This mode adjusts the setting values of the IF circuit.

(2) 2.V/C ・・・・・・・・・・・・・・・・・・・・・・ This mode adjusts the setting values of the VIDEO / CHROMA circuit.

(3) 3.AUDIO・・・・・・・・・・・・・・・・・・・ This mode adjusts the setting values of the multiplic ity SOUND circuit.

(4) 4.DEF ・・・・・・・・・・・・・・・・・・・・・ This mode adjusts the setting values of the DEFLECTION circuit for each aspect mode given below.

FULL (100 or 120Hzi)

PANORAMIC (100 or 120Hzi)

SUBTIT LE (100 or 120Hzi)

COMPRESS (Fixed value) (100 or 120Hzi)

(5) 5.VSM PRESET・・・・・・・・・・・・・ This mode adjusts the initial setting values of COOL, NORMAL and WARM.

(VSM : Video Status Memory)

(1) How to enter SERVICE MENU

Press the “INFORMATION” key and the “MUT ING” key of the REMOTE CONTROL UNIT simultaneously, and the SERVICE MENU screen of will be displayed.

Selection of SUB MENU SCREEN

Press one of keys 15 of the REMOTE CONTROL UNIT and select the SUB MENU SCREEN), form the SERVICE MENU.

SERVICE MENU → SUB MENU

1. IF

2. V - C

3. AUDIO

4. DEF.

5. VSM PRESET

6. STATUS

7. PIP

8. ---

9. SHIPPING (OFF)

0. BUS FREE


1) Method of Setting 1.IF

[VCO] ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ It must not adjust without signal.

1 Key・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ Select 1.IF.

1 Key・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ Select 1.VCO(CW)

Make sure that the arrow position between the ABOVE REF and BELOW REF.

INFORMATION Key・・・・・・・・・・・・・・・・・・・ Return to the SERVICE MENU screen.

Method of setting 2.V/C, 3.AUDIO, 4.DEF and 5.VSM PRESET.

25 Key・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ Select one from 2.V/C, 3.AUDIO, 4.DEF and 5.VSM PRESET.

FUNCTION UP or DOWN Key ・・・・・ Select setting items.

FUNCTION – or +  Key ・・・・・・・・・・・・・ Set (adjust) the setting values of the setting items.

MENU Key ・・・・・・・・・・・・・・・・・・・・・・・・・・・ Memorize the setting value.

(Before storing the setting values in memory, do not press the CH, TV, POWER ON or OFF key - if you do, the values will not be stored in memory.)

INFORMATION Key・・・・・・・・・・・・・・・・・・・ Return to the SERVICE MENU screen.

NB:  3) Do not setting 6.STATUS, 7.PIP, 8.--- , 9.SHIPPING(OFF) & 0.BUS FREE.

(4) Release of SERVICE MENU

1) After completing the setting, return to the SERVICE MENU, then again press the INFORMATION key.

Service adjustments full details












Deflection adjustment

There are 4 aspect modes ( FULL, PANORAMIC, SUBTITLE, COMPRES) of the adjustment ( 1 ) 100Hz i mode, ( 2 ) 120Hz i mode ・・・・・・ depending upon the kind of signals ( vertical frequency 100Hzi / 120Hzi ).

When the 100Hz FULL mode has been established, the setting of other modes will be done automatically.

However, if the picture quality has not been optimized, adjust each mod e again, respectively.

The adjustment using the remote control unit is made on the basis of the initial setting values.

The setting values which adjust the screen to the optimum condition can be different from the initial setting values.






AUDIO CIRCUIT ADJUSTMENT

Do not touch 3. AUDIO adjustment of the SERVICE MENU as it requires no adjustment.

If values had changed for the some reason, set the initial values in the following table.



Sunday, 13 December 2020

VESTEL 17MB171 software update, troubleshooting and general descriptions

 

Before removing the rear cover from the TV for servicing, make sure that no cables are fixated to the cover. Release the cables from their clamps and disconnect (if any). Failure to do so may damage the wires and  other components of the TV.

17MB171 main board is driven by MTK SOC. This IC is a single chip iDTV solution that supports channel decoding, MPEG decoding, and media-centre functionality enabled by a high performance AV CODEC and CPU.

T-T2-C-A TUNER (U118)

The Si2151 is Silicon Labs' sixth-generation hybrid TV tuner supporting all worldwide terrestrial and cable TV standards. Requiring no external balun, SAW filters, wire wound inductors or LNAs, the Si2151 offers the lowest-cost BOM for a hybrid TV tuner. Also included are an integrated power-on reset circuit and an option for single power supply operation. As with prior-generation Silicon Labs TV tuners, the Si2151 maintains very high linearity and low noise to deliver superior picture quality and a higher number of received stations when compared to other silicon tuners. The Si2151 offers increased immunity to WiFi and LTE interference, eliminating the need for external filtering. For the best performance with next-generation digital TV standards, such as DVB-T2/C2, the Si2151 delivers industry-leading phase noise performance.

MAIN AMPLIFIER (U123) (8W-10W-12W OPTIONS)

AD82587D is a digital audio amplifier capable of driving a pair of 8 ohm, 20W or a single 4 ohm, 40W speaker, both which operate with play music at a 24V supply without external heat-sink or fan requirement.  Using I2C digital control interface, the user can control AD82587D’s input format selection, DRC (dynamic range control), mute and volume control functions. AD82587D has many built-in protection circuits to safeguard AD82587D from connection errors.

Power Socket and Power Options

Power socket is used for taking 12V_STBY voltage which is produced in power card. Also socket is used for giving dimming, backlight and standby signals with power card. Power socket pinning is shown in figure.

12V_STBY is converted to several different voltages on the mainboard which are shown in below figure.

SAMSUNG EMMC 8GB KLM8G1GETF-B041 BGA153 (U128)

SAMSUNG eMMC is an embedded MMC solution designed in a BGA package form. eMMC operation is identical to a MMC device and therefore is a simple read and write to memory using MMC protocol v5.1 which is a industry standard. eMMC consists of NAND flash and a MMC controller. 3V supply voltage is required for the NAND area (VDDF or VCC) whereas 1.8V or 3V dual supply voltage (VDD or VCCQ) is supported for the MMC controller.  SAMSUNG eMMC supports HS400 in order to improve sequential bandwidth, especially sequential read performance.  There are several advantages of using eMMC. It is easy to use as the MMC interface allows easy integration with any microprocessor with MMC host. Any revision or amendment of NAND is invisible to the host as the embedded MMC controller insulates NAND technology from the host. This leads to faster product development as well as faster times to market. The embedded flash management software or FTL(Flash Transition Layer) of eMMC manages Wear Levelling, Bad Block Management and ECC. The FTL supports all features of the Samsung NAND flash and achieves optimal performance.

MAIN SOFTWARE UPDATE

Method-1

1. Copy MstarUpgrade.bin to USB stick (root directory, FAT32)

2. Enter M-Boot console first (Long press "ENTER" key on Tera Term Console when your device reboot then do AC On)

3. Plug the USB stick to your target board

4. Execute "custar" in M-Boot console to perform upgrading

Method-2

1. Copy upgrade_loader.pkg to root folder of USB stick (or copy upgrade_loader_no_tvcertificate.pkg if you don't want to erase keys, credentials, etc.)

2. Insert USB disk to one of the USB ports on your TV

3. Power on TV and wait until you see the bootlogo

4. You should see logs like below.

NO BACKLIGHT PROBLEM

Backlight pin, dimming pin, backlight supply, stby on/off pin

BACKLIGHT_ON/OFF pin should be high when the backlight is ON. Collector pin of Q113 must be low when the backlight is OFF. If it is a problem, please check Q181. Also it can be tested in TP500 or Pin5 of CN2 in main board. Please also check panel cables.

Dimming pin should be high or square wave in open position. If it is low, please check S294 for MTK side. It also can be checked at TP499. Please also check panel or power cables and connectors.

CI is not working when CI module inserted.

CI supply should be 5V when CI module inserted. If it is not 5V please check CI_PWR_CTRL, this pin should be low.

Check mechanical position of CI module. Is it inserted properly or not?

Detect ports should be low. If it is not low please check CI connector pins, CI module pins.


NO SOUND PROBLEM

Check supply voltages of 24V_VCC, VDD_AUDIO and 3V3_AMP with a voltage-meter. There may be a problem in headphone connector or headphone detect circuit (when headphone is connected, speakers are automatically muted). Measure voltage at HP_DETECT pin, it should be 3.3V.

STANDBY ON-OFF PROBLEM

There may be a problem about power supply. Check main supplies with a voltage-meter. Also there may be a problem about SW. Try to update TV with latest SW. Additionally it is good to check SW printouts via Teraterm program. These printouts may give a clue about the problem. You can use VGA for  Teraterm program connection.

SERVICE MENU

In order to reach service menu, first chose Channel, then press “MENU” buton, press “Advanced Options” then write “4725” by using remote controller.

You can see the service menu main screen below. You can check SW releases by using this menu under Diagnostic title. In addition, you can make changes on video settings, audio settings, DAP Parameters etc. using regarding titles. You may also use USB Operations for SW update and update Unique Keys and Configuration files.


Thursday, 10 December 2020

Sony HCD-GRX20, HCDRXD3 service mode, adjustments and schematic - MINI Hi-Fi COMPONENT SYSTEM

 

Continuous RMS power output (Reference) 50 W + 50 W (6 Ω at 1 kHz, 10% THD)

HCD-GRX20-RXD3 is the tuner, deck, CD and amplifier section in MHC-GRX20-RXD3.

CD Mechanism Type:  CX3

Base Unit Type:  KSM-213ECM

Optical Pick-up Type:  KSS-213ECM-C2NP

Tape Transport Mechanism Type:  CWL-44-FR

Continuous RMS power output (Reference):  50 W + 50 W (6 Ω at 1 kHz, 10% THD

AM tuner section

Tuning range:   531 – 1,602 kHz (with AM tuning interval set at 9 kHz) 530 – 1,710 kHz (with AM tuning interval set at 10 kHz)

Antenna:   AM loop antenna

Antenna terminals:   External antenna terminal

Intermediate frequency:   450 kHz

TEST MODE

Initialization

STOP + POWER OFF All preset data is re-set to the initial (default) value.

Model display

STOP + DISC 1 Mode name is displayed.

Destination display

STOP + DISC 2 Destination is displayed.

Version display

STOP + DISC 3 Version number of the microprocessor is displayed.

CD aging mode

STOP + DISC SKIP/EX-CHANGE Set discs to DISC 1 and DISC 3. The following operations are repeated when aging starts:

1. DISC 1: TOC Read

2. Plays back the last music of the DISC 1.

3. DISC 3 : TOC Read

4. Plays back the last music of the DISC 3.

5. STOP

6. Tray is open and closed.

TAPE aging mode

STOP + PLAY A Insert a commercially available cassette tape (10 min) to the decks A and B. When aging starts, each tape is rewound and the following operations are repeated:

1. TAPE A: FWD PLAY for one minute

2. TAPE A: FWD STOP for one second

3. TAPE A: FWD PLAY for three minutes

4. TAPE A: FWD FF to tape end

5. TAPE B: FWD PLAY for one minute

6. TAPE B: FWD REC PAUSE for one second

7. TAPE B: FWD REC for three minutes

8. TAPE B: FWD FF to tape end

9. TAPE B: REV PLAY for one minute

10. TAPE B: REV REC PAUSE for one second

11. TAPE B: REV REC for three minutes

12. TAPE B: REV FF to tape end.

CD service mode

STOP + OPEN/CLOSE The message “CD S - -” is displayed on the screen. The sled is moved to the outer circumference while the FF button is pressed. Also, the SLED is moved to the inner circumference while the REW button is pressed. After pressing the PLAY button, FOCUS is turned ON, CLV-S is set, TRACKING and SLED servos are turned OFF and ADDRESS 3 = 3F, 37 is set.

Display

STOP + DBFB All displays are turned ON.

Balance adjustment value

STOP + DISPLAY/DEMO The balance adjustment value is displayed.

Key check

STOP + FILE SELECT Function of the pressed key is displayed.

MECHANICAL ADJUSTMENTS

1. Clean the following parts with a denatured alcohol-moistened swab:

Record-playback head,  pinch rollers, erase head rubber belts, capstan idlers.

2. Demagnetize the record/playback head with a head demagnetizer.

3. Do not use a magnetized screwdriver for the adjustments.

4. After the adjustments, apply suitable locking compound to the parts adjusted.

5. The adjustments should be performed with the rated power supply voltage unless otherwise noted.

Torque Measurement

ELECTRICAL ADJUSTMENTS

DECK SECTION:  0 dB=0.775V

1. Demagnetize the record/playback head with a head demagnetizer.

2. Do not use a magnetized screwdriver for the adjustments.

3. After the adjustments, apply suitable locking compound to the parts adjusted.

4. The adjustments should be performed with the rated power supply voltage unless otherwise noted.

5. The adjustments should be performed in the order given in this service manual. (As a general rule, playback circuit adjustment should be completed before performing recording circuit adjustment.)

6. The adjustments should be performed for both L-CH and RCH.

Record/Playback Head Azimuth Adjustment (Deck A, Deck B)

[Perform these adjustments for both decks.]





AM Tuning Voltage Adjustment

1. Set the reception frequency of the unit to 530 kHz.

2. Adjust L105 for 1.2 ± 0.05 V reading on the DC voltmeter.

3. Set the reception frequency of the unit to 1,710 kHz.

4. Confirm that the voltage reading on the DC voltmeter is within 8.0 ± 0.5 V.

Adjustment Location: MAIN board.

AM Tracking Adjustment.

1. Tune the set to 600 kHz.

2. Set the output of AM RF SSG so that the input level of the set will become 60 dB (µV/m).

3. Adjust L104 so that when the waveform on the oscilloscope is maximum, no noise appears.

4. Tune the set to 1,400 kHz.

5. Adjust TC102 so that when the waveform on the oscilloscope is maximum, no noise appears.

Repeat the procedures in each adjustment several times, and the tracking adjustment should be finally done by the trimmer capacitors.

Adjustment Location: MAIN board.

FM Tuned Level Adjustment

1. Supply a 28 dB 98 MHz signal from the ANTENNA terminal.

2. Tune the set to 98 MHz.

3. Adjust SFR101 to the point (moment) when the TUNED indicator will change from going off to going on.

Adjustment Location: MAIN board

CD SECTION

1. CD Block is basically constructed to operate without adjustment. Therefore, check each item in order given.

2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.

3. Use an oscilloscope with more than 10MΩ impedance.

4. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.

5. Adjust the focus bias adjustment when optical block is replaced.

1. Connect oscilloscope to test point TP (RF) on CD DECODER board.

2. Turned Power switch on.

3. Put disc (YEDS-18) in and playback.

4. Confirm that oscilloscope waveform is clear and check RF signal level is correct or not.

Note: Clear RF signal waveform means that the shape “◊” can be clearly distinguished at the center of the waveform.

Circuit diagrams




LG 52LG50FD, 52LG50FD-SA-Service adjustments-service mode entry-white balance adjustment-ADC component 1 RGB adjustment and more

  These adjustments are similar to 42LB7DF Because this is not a hot chassis, it is not necessary to use an isolation transformer. However...