NO PICURE OR SOUND. STANDBY LIGHT BLINKS TWO TIMES [SONY KV-HA & KV-HW] WEGA SERIES TVS

Set switches ON without any problem, and after a second, the standby ligh blinks twice and switches OFF.
The fault is due to some shorted component/s on the main circuit board.  The system control detects this situation, and switches OFF the power supply regualtor section.
Probable causes are;
[1] Horizontal output transistor [2SD2624-CA - Q801] Collector to emitter short.
[2] Fly back transformer [FBT]  [NX 4751 M3A4 - T503]:  Internal winding short.
[3] Deflection Yoke.  Internal winding short.  This is a very rare case.
[4] Any capacitors at the horizontal output section.
Check:
Disconnect or desolder out [L 600], temporarly, and connect a 100W filment type bulb across [C614 - 33MFD 160V] Switch ON the TV and measure the voltage across C614.  It should be around 133 to 137VDC.  Be sure this voltage is steady. 
If it is OK;
Switch OFF the set, and measure the resistance to collector and emitter of Q801.  It should be never show below 50Ohms.  If the measured resistance shows below this range; desolder out the horizontal output transsistor from circuit, and measure the collector to emitter resistance.  It should never come to Zero.  If it shows no resistance [0 Ohms], make sure the transistor is defective. 
But, before replacing this transistor, We have to make sure that the Flyback Transformer is OK.  The flyback transformer cannot be checked by normal methods.  But there is a syptom to get it. 
Repalce the horizontal output transistor with a new one.  Fix it with all it fixures with heat sink. REPLACE [C812 - 0.033MFD] WITH A NEW ONE as a precautionary measure;  Because, if this capacitor has open circuit, the flyback transistor will blow out as soon as we switch ON the set.

Switch On the set.  If the flyback transformer is OK, and there is no other shorted components in the horizontal output stage, the set must come ON without any problem.

If it shuts down again, unplug the set from AC mains socket, and feel the heat of the newly fitted horizontal output transistor.  It may slighly warm, but never overheat.  If it overheats, be sure that the FBT is faulty, and should be replced.
Images of flyback transformer and horizontal output transistor are attached.

SONY WEGA SERIES PIN CUSHION DISTORTION repair KV-HA and KV-HW SERIES

The vertical lines on the right and left side of the TV will look somewhat bend inside, and the width of the picture will be less; somewhat distorted picture.



The pin-cusion [East-West] amplifier output section has the fault. 

Check and replace two pin-drive transistors [Q850 - MSD 601-RT1(NPN TYPE); Q851 - MSB 709-RT1(PNP TYPE), & Pin output FET Q802.  Replace zener diode [D805] too. Check the voltage at the collector point of Q850.  It should be around 8.5VDC.  Never attempt to measure the voltage at the source of the FET.  The multimeter might be damaged.

If this do not help you, replace the two ICs used there [MC4558CD & NJM2903M].  Bothe ICs are easy to get from most of the electronics spare part shops, and are cheap to buy. 
When replace the FET at the pin output section, be sure to make a it tight with its heatsink.  apply heatsink compond to get good heat transfer.

SONY WEGA TRINITRON KV-HA & KV-HW SERIES TVs HORIZONTAL OUTPUT TRANSISTOR BLOWS OUT

Horizontal output transistor [2SD2624-CA] blows off as soon as the set is switched ON; without allowing time to find the fault by any measuring instruments.

There are two resons for this fault.
The first one is with its deflection yoke.  If any turns in the winding of the deflection yoke get shorted each other, the horzontal output transistor will get shorted [collector to emitter].  But this fault is very rare to Sony Televisons.
The second one is with fault capacitors at the horizontal output circuit.
Beofre switch ON the set, after replacing the horizontal output transistor, replace these capcitors.  [C-812-0.033MFD; C-811-1MFD 250V; C-807-330PF 2KV; C-808 0.0082MFD; C-814 12KPF; C-813 330PF.
In most cases, dry soldering points at the terminals of C-812 or value detereiation of this capacitor will be the cause. If you switch ON the set without C-812, it is sure and certain that the horizontal output transisoor will get shorted.  Replace this capacitor with same capacitance value.  If the value changes, it will effect both high-tesion voltage and width of the picture. Select a good quality one.

This fault is common to all CRT based televisions, irrespective of brand.

NO PICTURE. SOUND OK. FOUR BLINKS FO STANDBY LED AFTER SWITCH ON [SONY WEGA SERIES KV-HA & KV-HW SERIES TVs]

NO PICTURE. SOUND OK.  FOUR BLINKS FO STANDBY LED AFTER SWITCH ON [SONY WEGA SERIES KV-HA & KV-HW SERIES TVs]

     Set switches ON and the standby light at its front panel blinks four times, and switches OFF.  This repeats each time switch ON the set. The fault is with its vertical output section.  This model sets has Bus chassis, and a self diagnosing circuits in the system control section always look into other components’ functions, and if a malfunction is noted, the main system control IC will send a stop signal to main power supply regulator section, stops it to prevent further damage.

     The most common fault found with this type of four blinks and shut down, is due to loose solder terminals at the Vertical Output IC.  This IC [AN 5512], will heat up to an extent, screwed on to a metal heat sink to radiate heat from it while it works.  Repeated heating and cooling might make the solder terminals to this IC to get loose contacted. Normally, these loose contacts are very difficult to detect, they will be microscopic in dimension.  It is a good practice, that suck out the solder on all solder terminals of this IC and resolder it with fresh solder.  This must solve the problem.  Failure of this IC is very rare.  Check this power supply rail too.  It is powered at its pin number (2) and (4). The voltage applied is [+13VDC] at pin number 2 and [-13VDC] at pin number 4.  These voltages are generated and supplied from Line Output transformer pins (7) & (9) respectively.

NO PICTURE. SOUND OK. SONY KVHA and KVHW WEGA SERIES TRINITRON TVs]

NO PICTURE. SOUND OK. SONY [KV-HA & KV-HW VEGA SERIES TRINITRON TVs]

Check the voltages at pins 1, 2 & 3 of (CN 703), at video amplifier card [picture tube base card].  If found abnormal, or less than 0.5VDC or so, the chroma IC on the A board should be suspected.  But before making it sure, just check the voltages at the video output pins [Pin 19, 20 & 21] of IC TDA 8844/N2.  It should be around 3VDC or so.  If there is no voltage at all, check the 9VDC bus from the SMPS power supply. This voltage comes out from a controlled regulator.  Check the voltage at the cathode of D314.  Must be 9VDC.  If not, check the voltage at its anode.  If there is no voltage at the anode of this diode, make sure that the controlled regulator is not working.  May be damaged or 9V regulator IC has damaged or not switching ON by the system control. If there is 9VDC at the cathode of D314, then check the voltage at pin number 37 of TDA 8844/N2.  If there is no voltage, check L312 for open circuit.  If these voltages are OK and still there is no voltage at the video output pins of the chroma IC TDA8844/N2, check the voltage at Pin number 7 & 8 [Serial Clock and Serial data respectively]. They should measure about 4.6VDC.  These voltages are comes to chroma IC from system control IC If there is no voltage at these pins, leave the chroma section, and come towards main system control section [IC CXP85***].

If serial data and serial clock voltages are OK, and there is 9VDC at pins 37&12 of TDA 8844/N2, and still there is no voltages at the video output pins stated above, touch the top of the main chroma IC TDA8844/N2, and feel the heat generated by it.  It can be moderately heated, but not overheated.  If it overheats, while all the above said voltages are ok, there is no further checking needed.  The IC is defective, and should be replaced.

HOW TO REPAIR VIDEO OUTPUT SECTION TO SONY WEGA [KV-HA AND KW-HA] SEIRES TVs

NO PICUTRE; SOUND OK; BLACK SCREEN - Troubleshooting

Check the voltages at CRG socket pins [8. 9 & 10].  If these voltages are found high (almost equal to video output supply voltage 200VDC], the chroma IC should be suspected.  Check the voltages at pins 1,2&3 of CN703.  These are the red, green and blue color information comes from the main board.  There must be a voltage equal to [2.5VDC].  This voltage will vary according to the video information.  If this voltage is high, you will get a full white raster with vertical retrace lines all along the screen. if the volte is very low, or no voltage at all, a full black screen will be the result.  Never consider this as a simple and easy to do work, as it needs so many checks at various points. 

If there is no voltage at these points, or very low voltage than normal; say about 0.03VDC  or so, go to chroma section at the main A board, and check the voltages at the pins of the chroma IC.  Chroma IC used here in these models are [TDA 8844 N2].
Details about further check with chorma section will be detailed in next post.

HOW TO REPAIR VIDEO OUTPUT SECTION TO SONY WEGA [KV-HA & KW-HA] SEIRS TVs

NO PICTURE, SOUND OK. FULL BRIGHT WHITE SCREEN. NO-ON SCREEN DISPLAY

      Check the video output supply voltage at Pin-1 of socket (701).  It should be around 200VDC.  If this voltage is absent, a white screen will be the result.  This is because, all the cathodes [Rg, Rk and Rb] will get no voltage, and will get a full bright raster [Screen],which will have no effect with adjsuting Brighness or Contrast coltrols. On-screen display may be there, but the contrast to display will be very weak.  Here the Screen voltage, EHT are present, but no voltages at the three cathodes of the picture tube.  As emission of CRT is negatively biased, that is, as the cathod voltage go down with repect to screen voltage, the emission will increse. Here as there is no supply voltage, there will be no voltages at the three cathodes of the picture tube [Pin numbers 8, 9, & 10] of crt base socket.  Measure the voltage at these pins.  It should be around 155VDC. if there is no voltage, check the vidwo output supply voltage line as stated above, and find the reason, if it is absent. 
     Voltage to video output is derived from rectifying the voltage generated at pin number (4) of line output transformer.  There is rectifier diode (D504) and a current limiting resistor (R509) [0.47Ohms/2W].  This rectifed voltage is smoothed by an electrolytic capacitor (C509), and this voltage is supplied to video output section as drive voltage to all video output transistors. If this voltage is found less than normal, or no voltage at all, the above mentioned three components should be checked. if the voltage is found very low, say 130VDC or so, the rectifier diode should be suspected.  In these sections, a special types of diodes are used to rectify the voltage generated by LOT.  All of them will be Fast Recovery type diodes, and the same type should be replaced. It is best to repalce the supply smoothng capacitor [33MFD 250V] along with the diode.
Contd:-

HOW TO ENTER SERVICE MODE TO SANYO / BPL [CE 30LC3 / CE 30LC3BK]

To enter service mode:
Press and Hold "Green" button on the remote control, press (P Dn) button on the cabinet front.
The service menu displays.
Use [Prog Up & Prog Dn] buttons on the remote control to highlight the the service menu you require, and press F/OK button to enter the adjusted data value into memory.

To exit from service meny, press "Menu:" button to navigate ackwards through the service menus until menus disappear.

SERVICE ADJUSTMENTS after memory ic replacement

To initilize the memory IC, Press and Hold [NORMAL --> . <--] button on the remmote control, and then press the (P Dn) button on the front panel of the TV set, and turn the Mains Switch OFF and then ON. The initilization is now completed.

HOW TO ENTER SERVICE MODE TO SANYO/BPL [C29LF34]

> To enter service mode, Press and Hold the "Menu" button on the front panel of the TV set, and digit "2" on the remote control
> Select item by pressing the [Channel Down] (Item Up), or [Channel Up] (Item down) button on the remote control.
> Adjust the data value to selected item, use Vol+ & Vol -ve buttons on the remote control.
> To exit from service mode, press "Menu" button, either on the TV set or on the remote control.

HOW TO ENTER SERVICE MODE TO PANASONIC PLASMA TVs

MODELS: PE77U_PE60U_PX75U_PX77U_PD50U_PX60U_PX600U_PZ700U_PZ750U_PX500U

To enter service mode to these model sets:
[1] Hold down the Vol (-) key on the front panel of the TV.
[2] Press "Recall" button on the remote control three times.
[3] To select an item, use digit keys "1" & "2" on the remote control.
[4] To select the sub-menus, use digit keys "3" & "4" on the remote control.
[5] To adjust the data value to selected item, use Vol+ & Vol (-) keys on the remote control.

6] To exit from service mode, Power OFF the set by its front panel ON/OFF switch.

HOW TO UNLOCK OR RESET ZENITH XBR-413 TO MULTIREGION.

Press "Setup" button and scroll to "Lock" display.
Press [0-0-0-0] from the remote control.
Press "Enter" button on the remote control.
The set will be now unlocked and can play all region discs.

HOW TO ENTER SERVICE MODE TO SONY BLU-RAY PLAYER [BDP-S350]

Turn the set ON by its front panel power ON/OFF switch, while pressing "Play, Stop & Opn/Close" keys together.
Be very carefull. Any misalingments to the settings may badly effect the player.  You must have thorugh knowledge to proceed.
To exit from service mode, switch OFF the set.

HOW TO ENTER SERVICE MODE TO VIDEOCON 3634R _ 5443R _ 5134R [CHALLENGER]

To enter service mode:

Short contact the service key [Hidden] on the remote.

The screen display "Service".
Press digit (1) to enter into service mode.
Press digit (2) to enter into Design Mode.
Press digit (3) to enter to factory settings.
Press digit (4) to enter into Manufacturing Mode. [This mode is used rarely]

To call an item to adjust, use "UP" & "DOWN" keys on the remote control.
To adjust the data value to selected item, use Vol+ & Vol (-) keys on the remote control.
To exit from service mode, short contact the Hidden Service Key again.

To access the [Hidden] key, just peel out the front sticker on the botton side of the remote control.  You can see the hidden control hole there.  Won't be a button, but a hole.  Using the head of a small nail, you can short ciruit the carbon contacts inside the remote control board.  This one touch will activate the service mode. 

HOW TO ENTER SERVICE MODE TO LG DIGITAL BUS CHASIS FITTED TVs [COMMON MODEL]

USED ICs

5W7 3CD0 => MAIN SYSTEM CONTROL.
LC 75342 => SOUND PROCESSOR.
LA 76810B => VIDEO CHROMA JUNGLE.
LA 7840 => VERTICAL OUTPUT.
7805BT => 5V REGULATOR.
LA 4277 => AUDIO OUTPUT.
HTS-2103S => LINE OUTPUT TRANSOFRMER
24C16 => MAIN SYSTEM MEMORY.
TRANSISTORS IN POWER SUPPLY REGULATOR.
To enter into service mode:
* Press Vol (-) button till volume to (00) [Minimum].
* Press "REP" on the remote control once and loosen it.
* Keep pressing Vol+/Vol(-)  on the TV unit, and press "REP" on the remote control.  The screen will display Factory Status.
* To exit from service mode:
When preset the "Set-Up" status using the above method, repeat the above three to exit.
* To call an item to adjust, press Ch+ & Ch(-) buttons on the remote control.
* To adjust the data value to selected item, use Vol+ & Vol (-) button on the remote control.
BLACK & WHITE BALANCE DATA CHART.

OSD	DATA	OSD	DATA
S-BRI	70	R-DRV	60
C,B/W	0	B-BIA	13
B-DRV	60	G-BIA	102
G-DRV	8	R-BIA	16

PRESET STAUS

ITEM	OSD	FULL NAME	DATA
00	H-PHASE	HORIZONTAL PHASE	10
01	NT.H PHASE	HORIZONTAL PHASE FOR NTSC STANDARD	13
02	H.BLK-LEFT	HORIZONTAL BLANKING - LEFT	4
03	V.BLAK-RIGHT	HORIZONTAL BLANKING - RIGHT	5
04	V-SIZE	VERTICAL SIZE	83
05	V-LIN	VERTICAL LENEARITY	10
06	V-POSI	VERTICAL POSITION	0
07	V-SC	VERTICAL S-CORRECTION	5
08	NT-V-SIZE	VERTICAL SIZE FOR NTSC STANDARD	10
09	NT-V-LINE	VERTICAL LINEARITY FOR NTSC STANDARD	10
10	NT-V-POS	VERTICAL POSITON FOR NTSC STANDARD	6
11	NT-V-SC	VERTICAL S-CORRECTION FOR NTSC STANDARD	5
12	RF-AGC	AGC ADJUSTMENT FOR RF	36
13	VOL-OUT	VOLUME OUTPUT	110
14	SUB-CONT	SUB CONTRAST ADJUSTMENT	31
15	SUB-COL	SUB-COLOR ADJUSTMENT	32
16	S-SHARP	SUB-SHARPNESS ADJUSTMENT	0
17	SUB-TINT	CUB-TINT ADJUSTMENT	32
18	OSD-CONT	ON-SCREEN DISPLAY CONTRAST	70
19	OSD-H-POS	OSD HORIZONTAL POSITION	20
20	OSD-V-POS	OSD VERTICAL POSITION	20

HOW TO ENTER SERVICE MODE TO APEX - AT 3208S [CHASIS CH-10C3]

To enter service mode:

* Decrese the volue level to "0" [Zero] with remote control.

** Press the "Mute" button on the remote control, and "Video" button on the front panel of the TV simoultaneously. "S" appears on the screen.

*** To call an item to adjust, use "UP" & "DOWN" buttons on the remote control.
**** To adjust the data value to selected item, use "Forward arrow & Revese arrow" buttons on the remote control.
**** To exit from service mode, press "Power" button on the remote control.

Default Factory Set Values will be added on request.

HOW TO ENTER SERVICE MODE TO SALORA & VIDEOCON [ MODEL NUMBERS SV-2012 _ SV-1412 _ SV-5136R]

ICs USED:

LA 7840 => VERTICAL OUTPUT.
KA 17812 => VOLTAGE REGULATOR [12V]
KA => 17805 => VOLTAGE REGULATOR [5V]
TDA 7056B => AUDIO OUTPUT.
LA 76810A => VIDEO CHROMA JUNGLE.
LC 863332A => MAIN SYSTEM CONTROL.
AT 24C08 =. MAIN SYSTEM MEMORY.
FLYBACK TRANSFORMER => [BSC24-01N40TC TF-0007-10]
TRANSISTORS USED IN SMPS POWER SUPPLY.

To enter service mode:

Short contact the Hidden Service Key on the remote handset.

"TEST" will appear on screen.

Press the numeric key in the order [1-2-3-4-5-6-7-8-9 & 0] on the remote control.

Menu 3-4 & 5 are general menus.  Menu numbers 1-2-6-8-9 & 0, are special Menus.
To access these special Menus, press digits [991220], during the "TEST" appears on the screen.

To call an item to adjust, use Up & Dn keys.
To adjust the data value to selected item, use Vol+ & Vol (-) keys.

To exit from service menu, short circuit the Hidden Service key on the remote control again or set to Standby.

HOW TO ENTER SERVICE MODE TO SALORA & VIDEOCON [1 CHIP CTV]

ICs USED

TDA 6107Q => VIDEO OUTPUT.
KA 500765 => POWER SUPPLY SWITCHING REGULATOR.
LA 7840 => VERTICAL OUTPUT.
TDA 8943SF => AUDIO OUTPUT.
KA 7632 => VOLTAGE REGULATOR - RESET - POWER ON/OFF [STANDBY]
TDA 9381PS => VIDEO CHROMA JUNGLE.
24C08W6 => MAIN SYSTEM MEMORY.

To enter service mode:
Press the folloing buttons on the remote control in sequence.

[STANDBY => DISPLAY => MENU => MUTE => POWER]

To call an item to adjust, use CH+ & Ch (-) buttons on the remote control.
To adjsut the data value to selected item, use Vol+ & Vol (-) buttons on the remote control.
To exit from service mode, press "Standby" button.

HOW TO ENTER SERVICE MODE TO PHILIPS - 21PT1532 _ 20PT3732 _ 14PT3782

IC USED
TMP87CH36N _ ST24C08 _ TDA8374 OR TDA8375 _ TDA8335N29 _ TDA4665 _ TDA9302H _ HEF4052B _ UPC1853 _ AN7161N _ BA3313L _ TDA7056B & MC44603P in SMPS power supply.

To enter service mode, press the following keys in sequence. Be as fast as you can, and never allow much time in between button presses.

[0 => 6 => 2 => 5 => 9 => 6 => OSD]

To call an item to adjust, use Ch+ & Ch (-) keys on the remote control.
To adjust the data value to selected item, use Vol+ & Vol (-) keys on the remote control.
To exit from service mode, switch OFF the set by mains power ON/OFF switch.

HOW TO ENTER SERVICE MODE TO THOMSON - TX-807 _ TX-90 _ TX-91

IC USED
TMP 47P1637N => MICROPROCESSOR [SYSTEM CONTROL]
ST24C04 => SYSTEM MEMORY.
TDA 9302H  => VERTICAL OUTPUT.
STV 8225 => AM SIF.
TDA 7263 => AUDIO OUTPUT.
TDA 8842 => VIDEO CHROMA JUNGLE.

To enter service mode, switch OFF the TV by remote control [Standby] position and wait till the Standby LED at its front panel to off.

Press "VT" button on the remote control, and switch ON the TV with its mains switch.
To call an item to adjust, use Prog+ and Prog (-) buttons on the remote control.
To adjsut the data value to selected item, use Vol+ and Vol (-) buttons on the remote control.
To exit from service menu, switch OFF the set by its mains ON/OFF switch.

HOW TO ENTER SERVICE MODE TO MAJORITY OF SONY TRINITRON TV MODELS

To enter service mode

Press the following buttons on the remote control in  quick sequence.

STANDBY=>DISPLAY=>5=>VOLUME(+) =>POWER.

Press digit buttons 1 & 4 to call an item for adjustment
Press digit buttons 3 & 6 to raise or lower the data value to selected item.
Press "Muting" button to write the adjusted data value to memory.
Press "0" (Zero) button to execute writing.
 If you do not press Zero button to execute the adjusted data into memory, the adjsuted value will not be entered into memory.

To exit from service mode, press Power button once.  The TV will come into standby mode.  Press Power button again,  The Tv will switch ON with adjusted data values.

HOW TO ENTER SERVICE MODE TO BUSH and AKAI TVs

MODELS: CT-147MK-2 / CT-147R-MK2 / CT-217 MK2 / CT-217R MK2 / CT-207 MK2 / CT-207R MK2 & CT-21W9.

To enter service mode to these sets

* Simultaneously press "Display Button" on the remote handset, and "Volume (-)" button on the front panel of the TV.

** To call an item to adjust, use Prog + & Prog (-) buttons on the remote control.
*** To adjust the data value to selected item, Press V + & V(-) buttons on the remote control.
**** To exit from service mode, switch OFF the TV by its "Front Panel Power ON/OFF button.

Various parameters and their default values.  Default values may change set to set.

OSD	PARAMETER	DEFAULT VALUE	RANGE
V-SIZE/50Hz	VERTICAL SIZE ADJUSTMENT FOR 50Hz	12	0=>127
V-POSITION 60Hz	VERTICAL POSITION FOR 60Hz	32	0=>63
BLUE-DRIVE	BLUE DRIVE CONTROL	127	0=>127
V-POSITION 50Hz	VERTICAL POSITION FOR 50Hz	32	0=>63
GREEN DRIVE	GREEN DRIVE CONTROL	14	0=>15
RED-DRIVE	RED DRIVE CONTROL	85	0=>127
BLUE-BAS	BLUE BIAS CONTROL	78	0=>255
GREEN-BIAS	GREEN BIAS CONTROL	125	0=>255
RED-BIAS	RED BIAS CONTROL	90	0=>255
SUB-TINT	SUB TINT CONTROL	84	0=>127
SUB-COLOR	SUB COLOR ADJUST	63	0=>63
CONTRAST-CENTER	CONTRAST CENTER ADJUST	63	0=>63
SUB CONTRAST	SUB CONTRAST ADJUST	15	0=>63
SUB-BRIGHT	SUB BRIGHTNESS ADJUST	116	0=>127
SECAM R-Y DC	R-Y DC ADJUST FOR SECAM SYSTEM	15	0=>15
SECAM B-Y DC	B-Y DC ADJUST FOR SECAM SYSTEM	15	0=>15
RF-AGC DELAY	RF AGC DELAY ADJUST	29	0=>63 [May differ set to set]
H-PHASE 60Hz	HORIZONTAL PHASE ADJUST FOR 60HZ STANDARD	18	0=>31
H-PHASE 50Hz	HORIZONTAL PHASE ADJUST FOR 50Hz STANDARD	11	0=>31
V-LENEARITY	VERTICAL LENEARITY ADJUST	21	0=.31 [May differ to set toset]