Service and Quality
Service Publications Dept.
One Philips Drive
P.O. Box 14810
Knoxville, TN 37914
Manual 7553
Model no.: 20LJ26
First Publish: 12-15-97
Rev. Date: 11-22-2005
Print Date: 22/11/2005
Parts List
REFER TO SAFETY GUIDELINES
SAFETY NOTICE: ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE
HIMSELF WITH THE CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS
TO BE USED WHEN SERVICING ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFORMER FOR THIS UNIT WHEN SERVICING
R230 18k, 5%, 1/4W, Metal Film (Mono Models) 4835 116 57323
S R231 27 ohm, 5%, 3W, Metal Film (Mono Models 4835 116 67159
S R231 6.8 ohm, 5%, 3W, Metal Film (Stereo Mod
R88 10k, 5%, 1/10W, Metal Film (AVJ180 Only 4835 111 37216
R89 1k, 5%, 1/10W, Metal Film (AVJ180 Only) 4835 111 37433
R90 18k, 5%, 1/10W, Metal Film (AVJ180 Only 4835 111 37232
MISCELLANEOUS
Caution: The X6 Chassis incorporates a "HOT" ground system. Always use a separate isolation
transformer when applying power to the exposed chassis.
IMPORTANT NOTES 2
FOCUS 2
R.F. AGC DELAY 2
VCO ADJUSTMENT 2
VERTICAL SIZE AND VERTICAL CENTERING 2
HORIZONTAL CENTERING ADJUSTMENT 2
ADJUSTING THE PICTURE 2
DEGAUSSING THE RECEIVER 2
CONVERGENCE AND PURITY ADJUSTMENT PROCEDURE 2
STEREO ALIGNMENT (FOR STEREO MODELS ONLY) 5
AUDIO/VIDEO JACK PANEL ALIGNMENT 5
SERVICE TEST MODE PROCEDURES 6
CLOCK CALIBRATION 7
PRACTICAL SERVICE PRECAUTIONS
Page 9
IMPORTANT NOTES
Unless otherwise Specified:
1. All service adjustments are "HOT" voltagewise. For maximum safety, ensure the use of properly insulated tools.
2. Refer to the X6 Chassis Layout Diagram (Figure 1)for quick location of test points or service adjustment controls.
3. Grid locations (Ex. D-2) next to control reference numbers refer to the Printed Circuit Board Illustrations.
FOCUS
1. Tune in a local station and adjust the Focus Control(located on Flyback) for best picture details at high light condition.
R.F. AGC DELAY
1. Tune to a weak station, or loosely couple the antenna to observe a snowy picture.
2. Set the R.F. AGC delay (R206, E-1) to its fully clockwise (CW) position.
3. Slowly turn R206 counterclockwise (CCW) to a point slightly beyond the point of minimum snow.
NOTE: Do not turn the control any further as it may result in an overloaded picture on the face of the
CRT(caused by a strong station signal).
VCO ADJUSTMENT
1. Ensure the set is in the Antenna mode (not Cable) and tune the receiver to a good local air signal.
2. Temporally place a jumper from pin 5 (Coincidence) of IC270 (D-2) to ground.
3. Connect a DC voltmeter (input impedance 10 Megohms or more) to Test Point 2 (AFT D-1).
4. Adjust L210 (D-2) to 2.5Vdc exactly.
5. Remove the jumper from pin 5 of IC270 to ground.
VERTICAL SIZE AND VERTICAL CENTERING
1. Apply a Crosshatch pattern to the antenna input terminal.
2. Adjust the Vertical Size Control (R557 J-2) to obtain a slight underscan of the raster at the top and bottom portions
of the screen.
3. If the raster is not centered, adjust the Vertical Centering Control (R558 J-2) to center the raster properly on the screen.
4. Adjust the Vertical Size Control (R557) to obtain a slight overscan at the top and bottom of the screen(approximately 8%
overscan total).
HORIZONTAL CENTERING ADJUSTMENT
1. Apply a crosshatch pattern to the antenna terminal.
2. Adjust the Horizontal Centering Control (R520 D-1) to obtain proper horizontal centering of the crosshatch pattern at the
left and right of the screen.
ADJUSTING THE PICTURE
NOTE: The Color Purity and Convergence Adjustments described below should be performed onlyafter installation of a new
CRT or Deflection Yoke Assembly; otherwise, it will not be necessary to remove the rubber wedges. Minor corrections for
purity and convergence can be acomplished through the use of the Purity and Convergence Assembly located on the neck of
the CRT.
DEGAUSSING THE RECEIVER
1. Position the TV receiver so that the screen faces the direction it will be facing, while in use.
2. Before the set is turned on, thoroughly degauss the entire receiver.
a. Move a Degaussing Coil in a circular motion slowly around the sides and the front face plate of the receiver.
b. Withdraw the Degaussing Coil at least six feet before disconnecting it from its power source.
CONVERGENCE AND PURITY ADJUSTMENT PROCEDURE
PRE CONVERGENCE PROCEDURE:
(Perform the DEGAUSS PROCEDURE first.)
1. Place the multi-pole Purity and Convergence Assembly with the 2-Y pole Purity Rings directly in the gap between the G2
and G3 (Focus) Grids. (As shown in graphic ).
2. Connect a Center Cross pattern or a Crosshatch pattern to the antenna terminals.
3. Set the Green Cutoff control (R649) to its fully clockwise (CW) position.
4. Set the Green Drive control (R643) to its fully counterclockwise (CCW) position.
5. Loosen the Yoke Clamp screws, pull the Yoke back and remove the three Yoke wedges.
6. Slide the Yoke all the way forward so that it rests against the bell of the CRT.
7. Tighten the Yoke Clamp screw so that the Yoke doesn't drop away from the bell of the CRT.
8. Slowly spread and, if necessary, rotate the 2-Y pole purity rings so that the red and blue lines are at least parallel and
preferably coincide at the 6:00 and 12:00 o'clock position. (Refer to graphic) .
Page 10
Proceed to COLOR PURITY ADJUSTMENT
COLOR PURITY ADJUSTMENT
1. Connect a White Screen signal to the Antenna terminals.
2. Set the Red Cutoff (R650) and Blue Cutoff (R648) controls fully clockwise (CW).
Then set the Blue Drive (R642) fully counterclockwise (CCW).
3. Set the Green Cutoff control (R649) fully counterclockwise (CCW) and the Green Drive control (R643) Fully clockwise
(CW).
4. Slowly spread the 2-X Pole Purity Rings to center the Green portion of the screen leaving the same amount of Red on the
left side as there is blue on the right.
5. Loosen the Yoke Clamp screws and slide the Yoke back to the point of best Green Purity.
6. Tighten the Yoke Clamp screw slightly so that the Yoke can still be moved with some friction.
7. Proceed to STATIC CENTER CONVERGENCE .
STATIC CENTER CONVERGENCE
1. Connect a Center Cross pattern or a Crosshatch pattern to the Antenna terminals to ensure that the yoke is not tilted.
Rotate the yoke, if necessary, to obtain a level raster.
2. Set the Green Cutoff control (R649)to its fully clockwise (CW) position.
3. Set the Green Drive control (R643)to its fully counterclockwise (CCW) position.
4. Set the Red Cutoff (R650) and Blue Cutoff (R648) controls to their midrange positions. Then set the Blue Drive (R642)
control fully clockwise (CW).
5. Slowly spread and, if necessary, rotate the 4-Pole Magnetic Rings to converge Red and Blue lines at the center of the
screen.
6. Set the Green Drive control (R643) to its maximum clockwise (CW) position.
7. Adjust the Green Cutoff control (R649) to bring its Gun back up to approximately the same intensity as the Red and Blue
Guns.
8. Slowly spread and, if necessary, rotate the 6-Pole Magnetic Rings to converge Red/Blue on Green lines at the center of
the screen.
9. Repeat steps 5 through 8 for optimum performance.
Proceed to DYNAMIC EDGE CONVERGENCE
Page 11
DYNAMIC EDGE CONVERGENCE
Note: To secure the correct position of the Deflection Yoke, three rubber wedges are used. They are ultimately to be placed
as shown in Figure 4c or 5c.
1. Apply a crosshatch pattern signal to the Antenna terminals and set the Green Drive control (R643) to its fully counterclockwise (CCW) position.
2. Set the Green Cutoff control (R649) to its fully clockwise (CW) position.
3. Tilt the Yoke up and down to converge the Red and Blue vertical lines at the 6 and 12 o'clock positions, and the Red and
Blue horizontal lines at the 3 and 9 o'clock (Refer to graphic ).
When the correct position has been found, place a rubber wedge between the Yoke and the CRT. If the Yoke is tilted UP,
place wedge 1 as shown in Figure D; if it is tilted DOWN, place wedge 1 as shown in Figure A .
4. Tilt the Yolk to the left and right to find the point of best possible convergence of the Red and Blue lines at the edges, top
and bottom of the screen as seen in Figure 7 . When the correct position is located, place wedges 2 and 3 as seen in Figure
B or E .
5. Now, remove wedge 1 and place it in the final position as shown in Figure C or F .
6. Set the Green Drive control (R643) to its fully clockwise (CW) position.
7. Adjust the Green Cutoff control (R649) to bring its Gun back up to approximately the same intensity as the Red and Blue
Guns.
8. Proceed to the WHITE BALANCE ADJUSTMENT .
Page 12
WHITE BALANCE ADJUSTMENT
1. Turn the set on.
2. Using the on screen Customer Menu, set the Color, Brightness, Picture and Sharpness controls to Minimum.
Select Antenna Input and disconnect the antenna input.
3. Set G2 Control (on flyback transformer) to minimum (counterclockwise).
4. Set Green and Blue Drive Controls to mid-range. Red Drive is fixed at mid-range.
5. Set all three Cutoff controls to their fully clockwise positions.
6. Turn the set off with the Remote Transmitter (do not unplug set).
7. Disconnect the vertical yoke plug (P/J550).
8. Turn the set on.
9. Adjust G2 (Screen) clockwise until a line just becomes visible. This line will be the color of the dominant gun.
10. Adjust the other two cutoff controls to achieve a low-level white line.
11. Turn the set off with the Remote Transmitter.
12. Reconnect the yoke plug (P/J550).
13. Turn the set On.
14. Set on screen Customer Controls back to original position (or activate the reset fuction/personal preference).
15. If necessary, adjust Green and Blue Drive Controls to achieve a white raster.
16. Connect a television signal (CATV or Air) to the antenna input.
17. Adjust G2 to attain the best black level with the ptcture diplayed.
STEREO ALIGNMENT (FOR STEREO MODELS ONLY)
Note: The following procedure was performed with a Sencore VG91 Universal Video Generator and must be done while the
set is in the Service Mode.
1. Enter the Service Mode by pressing 06-25-96-Menu on the Remote Transmitter, and scan to channel 3.
Do not mute sound during the following adjustments.
Input Level Adjust
1. Set the VG91 to 300Hz, L+R, No Pilot (Mono), Channel 3. Video Pattern = Raster, R-G-B raster colors off.
2. Connect the RF output of the generator to the Television Antenna Input, adjust the VG91 level to remove any snow from
the raster.
3. Enter 81 with the remote for Input Level.
4. Adjust Input Level to 1.4Vp-p on scope at Test Point 52 (Pin 10 of IC200) using the +/- controls on the remote.
Wide Band Adjustment
1. Change VG91 to L (only), normal (100%) pilot.
2. Enter 83 with remote for Wide Band/ Spectrum adjustments.
3. Adjust Wide Band for a Null reading on the oscilloscope at Test Point 53 (Pin 33 of IC200) using the menu +/- buttons on
the Remote Transmitter.
Spectrum
1. Change VG91 setting to 3kHz.
2. Adjust Spectrun for Null on scope at Test Point 53 (Pin 33, IC200) using menu up/down buttons on remote.
3. Repeat Wide Band & Spectrum Adjustments again.
AUDIO/VIDEO JACK PANEL ALIGNMENT
Video Alignment
1. Connect an oscilloscope to Test Point 52 (or pin 2 of P40).
2. Apply a composite video signal of 1 Vp-p to the Aux Video Input.
NOTE: Leader model LCG-396 has a composite video signal output with a preset level of 1Vp-p.
3. Turn the set on and adjust the following.
For AVJ180 and AVJ183 - Turn R40 fully clockwise, then adjust R40 for 1Vp-p at TP52. Make sure the adjustment is on the
correct slope of the response curve, this will be the first point to reach 1Vp-p going from the clockwise stop.
Audio Alignment
1. Connect an audio signal source (Example: B&K 3011) to the Right/Mono input to the jack panel.
With the signal source connected adjust the signal to 5OOmVrms (check at J45).
2. Connect an oscilloscope to Test Point 53 and adjust R60 to 1.5Vp-p.
3. Move the audio source to the Left audio input.
4. Connect an oscilloscope to Test Point 54 and adjust R80 to 1.5Vp-p.
Page 13
SERVICE TEST MODE PROCEDURES
1. Press the following transmitter keys without allowing the on screen display to time out between entries.
NOTE: The transmitter supplied with the set may not perform this task properly, if the word "MENU" appears on
screen at the end of the following sequence. A UR14, T251, or other similar transmitter with channel and volume keys
separate from the menu keys must be acquired.
0-6-2-5-9-6-Menu
2. The Following is an example of what will be displayed on the screen and an explanation of the characters shown.
Top Line
62000-1 = Microprocessor part number
E = Error Codes will be displayed here if a communication error exists (i/.e.A = tuner error)
Error Codes:
A = Tuner not responding.
B = Memory
D = Automatic Volume Limiter (Smart Sound)
Bottom Line
= Corner Marks
29 = Current Channel
FEATURE = Indicates Current Register
02 = Current register value in Hexadecimal format.
By pressing the STATUS/EXIT button on the transmitter, the run timer will be displayed in the upper left corner, also in
Hexadecimal.
To select another register, press the menu button on the transmitter until the desired register is displayed, or each register
may be accessed directly by entering the register number.
NOTE: SETS WITH VOLUME LIMITER
1. ENTER THE FOLLOWING NUMBERS WITHOUT LETTING THE ON-SCREEN DISPLAY TIMEOUT.
07-20-91-"MENU"
2. USE THE "+/-" KEYS TO SET THE VOLUME LIMIT.
3. PRESS THE "STATUS" KEY TO SAVE THE VOLUME LIMIT. (WHEN THE "STATUS" KEY IS DEPRESSED, THE BAR
GRAPH WILL APPEAR TO DROP TO ZERO BEFORE DISAPPEARING-THIS IS NORMAL).
Cannot enter by pressing menu button. Cannot exit without pressing another register number.
NOTE: DO NOT enter register 82. This is a factory stereo alignment, if register 82 is adjusted a full stereo alignment will be
required.
Page 14
Smart Picture Registers
To enter the Smart Picture Registers, press the smart picture button on the remote. To scroll through the registers, depress
the smart picture button again. To change the value, depress the "+" and "-" keys on the remote transmitter.
The following registers are accessible:
REGISTER VAL.(HEX)
SPORTS PICTURE 2F
SPORTS COLOR 27
SPORTS SHARPNSS 1F
MOVIES PICTURE 1F
MOVIES COLOR 1F
MOVIES SHARPNEWW 1F
WEAK PICTURE 0F
WEAK COLOR 10
WEAK SHARPNESS 0F
GAMES PICTURE 17
GAMES COLOR 1F
GAMES SHARPNESS 1F
To exit Smart Picture Registers, press the STATUS/EXIT button on the remote transmitter. This will return you to the
service test mode.
To Exit the Field Service Mode:
To exit the field service mode depress the PWR button on the local keyboard or remove the AC power from the set.
NOTE: Data may only be saved to the memory when exiting the mode through the PWR button on the local keyboard. All
video controls shall be saved locally to the customer set up registers in the EEPROM. Customer stalus/setup and favorite
station information will not be altered by exiting the field service mode.
CLOCK CALIBRATION
The microcomputer's crystal oscillator frequency of approx. 12MHz is applied to a divider program (within the micro) in order
to supply a frequency of 2403.846153846Hz. The 12MHz oscillator frequency cannot be adjusted or measured (it is internal
to the IC), however, a correction factor may be input in to the divider program in order to adjust for a slow or fast clock
reading.
This correction factor is selected in the Service Mode by changing the value held in register 17. The data within this register
can range from00 (none) to 7F max. (for a fast clock) or FF (for a slow clock). Models are shipped from the factory with a
default value of 00 or 80 for NO correction.
The more practical method is to simply question the customer on the number of minutes per month the clock is off (assuming
the time error has been checked against a known accurate time source). Calculate using the formula below:
Minutes of error per month X 2 = Sec. of error per day. Is it losing (slow) or gaining (fast)?
Enter the Service Mode and look at register 17. If it is 00 or 80 the task is easy. Look up (use Table) the seconds of correction
needed, fast or slow, and enter its "calibration byte" in for the data held by register 17.
Click here if clock is fast to see appropriate table.
Page 15
Page 16
Click here if clock is slow to see appropriate table.
Page 17
Normal Example:
4 minutes fast a month X 2 = 8 seconds a day fast.
The Chart says if the clock is 8 seconds a day fast without correction, then use 59. Change register 17 from 00 to 59. If there
is a calibration byte in register 17 other than 00 or 80 then the job gets a bit more complex.
Note: Modifying the value held in this register does not change the oscillator frequency
Complex Example #1
Using the error from the "normal example", 8 seconds fast a day, you find the register 17 the data value of 16. Look up 16
and you find that there is already a correction for 2 seconds fast a day. You need 8 seconds fast more correction (2 + 8 = 10)
or a total of 10 seconds fast correction which is 6E. Enter 6E for the data held by register 17.
Complex Example #2:
If the clock is 8 seconds fast a day and you find register 17 holds the data value of 96 you have 2 seconds a day correction in
the wrong direction (slow). You need to "back up" 8 seconds. First, if you back up to 80 (no correction) you have used 2 of the
8 seconds leaving 6. Then go 6 seconds in the fast column, from no correction to 6 seconds (43). Enter 43 for the data held
by register 17.
PRACTICAL SERVICE PRECAUTIONS
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.
Always respect voltages. While some may not be dangerous in themselves, they can cause unexpected reactions, reactions
that are best avoided. Before reaching into the powered color TV set, it is best to test the high voltage insulation. It's easy to
do and is just a good service precaution.
Before powering up the TV with the back off (or on a test fixture), attach a clip lead to the CRT DAG ground and to a
screwdriver blade whose handle is well insulated. After the TV is powered on and high voltage has developed, probe the
anode lead with the blade starting at the case of the High Voltage Transformer (flyback-IFT). Move the blade to within two
inches of the connector of the CRT.
If there is an arc, you found it the easy way, without getting a shock! If there is an arc to the screwdriver blade, replace the
High Voltage Transformer (or the lead, if removable) whichever is causing the problem.
Page 18
Page: 1 of 3 Chassis: 19X6
Contents of Known Faults for: 19X6
1. - Chassis frame part # for 25" and 27"
2. - Dead
3. - Dead, Q502 shorted, possible repeat failure
4. - Intermittent loss of sync
5. - Model 19PR17 extra remote
6. - Model PL6125 dark blob/circle in center of video
Chassis frame part # for 25" and 27"
Information: The chassis frame for the 25X6 and 27X6 (147192-0008) has been assigned a
Service Code. The Service Code number will be loaded into the system within the first week of
June. Parts will be available shortly after the number becomes active. Service Code 4835 432
17953
Dead
Symptom: Dead set, open F401, suspect 130 volt regulator shorted.
Cause: Metal scrap or Heat Sink burr behind regulator IC, possibily enbedded in mica or Sil-Pad
insulator.
Cure: Replace Regulator IC using 4835 310 57401 Kit. Kit contains replacement Sil-Pad for all
applications.
Dead, Q502 shorted, possible repeat failure
Symptom: Dead set, Q502 shorted, possible repeat failure.
Check: R505 for correct value (.47 ohm). A very small number may have 4.7 ohm in R505.
Note: If Q502 is shorted you can not check R505 in circuit. With Q502 removed (or good) R505
should measure about .4 ohms in-circuit. Also, check R501 (200 ohms) and R502 (2K-13/19"
and 3K 25/27").
No. 4 ****************************
Page 19
Page: 2 of 3 Chassis: 19X6
Manual Number: 7553
Intermittent loss of sync
Symptom: Intermittent loss of sync, most evident by loss of horizontal sync.
Cause: Y620, 3.58 crystal may be locking to either the 3rd harmonic or 3rd overtone.
Cure: Replace Y620 - 4835 242 77215
Model 19PR17 extra remote
Information: The model, 19PR17, uses an extra remote packed for special promotions. All
versions are packed with T216EG-MA01, (4835 219 17641). C521 versions are packed with
extra RG9168-GN01, (4835 219 17689). C621, C622, C625 are packed with extra
T216JG-MA01, (4835 219 17642).
No memory after power loss
The following models have no memory when they are unplugged (or power lost):
13" CT1301, PR1301, XR1301
19" CT1901, PR1901, XR1901, HD1917
25" CT2501, TR2501, XR2501, HD2517
Items lost: Last channel viewed
Favorite station memory
Control settings
This is by design intent, they are designed and manufactured to be a leader model. There is no
Page 20
Page: 3 of 3 Chassis: 19X6
smart sound or smart picture even if the display appears. These units all use a 20 button remote.
This remote has NO Smart button. Use of a different (21 button) remote will put the Smart
functions on the screen but they will not work and will disappear when the set is unplugged. ALL
memory functions (controls-stations-functions) are forgott en when the AC power is lost.
R505 and V505 information
Information: The location marked R505 or V505 may be a resistor or a jumper wire. This is
based on the Horizontal driver transformer. There are 2 outlines on the PCB for the driver
transformer, T504 and T505. T504 is the larger outline and uses R505. T505 is the smaller size
and uses V505, a wire, in place of R505. When R505 is used, ONLY a .47 ohm resistor is
correct.
Vertical size will not adjust correctly
CHASSIS AFFECTED: 13X6, 19X6, 20X6
SYMPTOM: Inability to adjust vertical correctly, may show only when "hot".
CURE: Replace R559 with 910 ohm, 1/8 watt, CF, 4835 110 67238.
NOTE: This applies to all 13X6 and 20X6. In 19X6 this applies to all EXCEPT EMX683/684/685.
Page 21
20LJ26(7553) - X6 CHASSIS WIRING DIAGRAMPage: 1 of 19
Page 22
20LJ26(7553) - MAIN SCHEMATIC - SECTION 1Page: 2 of 19
Page 23
20LJ26(7553) - MAIN SCHEMATIC - SECTION 2Page: 3 of 19
Page 24
20LJ26(7553) - MAIN SCHEMATIC - SECTION 3Page: 4 of 19
Page 25
20LJ26(7553) - MAIN SCHEMATIC - SECTION 4Page: 5 of 19
Page 26
20LJ26(7553) - MAIN SCHEMATIC - SECTION 5Page: 6 of 19
Page 27
20LJ26(7553) - 13, 19, 20" CRT SCHEMATICPage: 7 of 19
Page 28
20LJ26(7553) - 25, 27" CRT SCHEMATICPage: 8 of 19
Page 29
20LJ26(7553) - JACK PANEL SCHEMATIC (AVJ183)Page: 9 of 19
Page 30
20LJ26(7553) - JACK PANEL SCHEMATIC (AVJ179 & 180)Page: 10 of 19
Page 31
20LJ26(7553) - DATA TERMINAL INTERFACE SCHEMATICPage: 11 of 19
Page 32
20LJ26(7553) - MAIN CBAPage: 12 of 19
Page 33
20LJ26(7553) - 13, 19, 20" CRT CBAPage: 13 of 19
Page 34
20LJ26(7553) - 25, 27" CRT CBAPage: 14 of 19
Page 35
20LJ26(7553) - AVJ183 JACK PANEL CBA (TOP)Page: 15 of 19
Page 36
20LJ26(7553) - AVJ 183 JACK PANEL CBA (BOTTOM)Page: 16 of 19
Page 37
20LJ26(7553) - AVJ179&180 JACK PANEL CBA (TOP)Page: 17 of 19
Page 38
20LJ26(7553) - AVJ179&180 JACK PANEL CBA (BOTTOM)Page: 18 of 19
Page 39
20LJ26(7553) - DATA TERMINAL INTERFACE CBAPage: 19 of 19
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