Sharp 21FL-90N Schematic
21LF-90N
SERVICE MANUAL
SE0021LF90N00
Issued: 16th Feb. 2004
AK- 44 CHASSIS
PAL B/G / SECAM L/L’, B/G, D/K SYSTEM COLOUR TELEVISION
MODEL 21LF-90NES
In the interests of user safety (required by safety
regulations in some countries) the set should be restored to its original condition and only parts identical to those specified should be used.
In order to service the model 21LF-90N, refer to
the AK-44 Chassis Service Manual
(SE00AK44CHA00).
CONTENTS
ELECTRICAL SPECIFICATIONS ........................................................................................ 3
IMPORTANT SERVICING NOTES ...................................................................................... 4
CONTROLS & TERMINALS ................................................................................................ 5
PRINTED WIRING BOARD LAYOUT ................................................................................. 6
PARTS LISTING ................................................................................................................... 7
HOW TO UPDATE THE TECHNICAL INFORMATION ...................................................... 11
SHARP CORPORATION
1
This document has been published to
be used for after sales service only.
21LF-90N
SERVICE MANUAL UPDATE LOG SHEET
Technical Report No.
Technical Bulletin No.
Cause / Solution
Part No.
Page No.
Application
Data /Serial No.
Use this page to keep any special servicing information as Technical Report (Bulletin), Technical Information, etc.
If only part number changes are required, just change part number directly the part number in the Parts Listing Section.
If you need more information, please refer to the Technical Report (Bulletin).
2
ELECTRICAL SPECIFICATIONS
21LF-90N
•Power Input .................... 220V-240 Volts AC 50 Hz
•Power Consumption
Normal Operation (Method IEC60107) .............. 62 W
Stand-by Operation .......................................... < 3 W
•Audio Power Output Rating (MPO) / Impedance
Internal Left Speaker ................................. 4 W, 16 Ω
Internal Right Speaker ............................... 4 W, 16 Ω
•Speakers
Speaker elliptic (2 pcs) .......................... 50 x 120 mm
•Convergence (Maximum Misconvergence)
AREA 21”
A0.3
BC 1.0
DE 1.0
FGHJ 1.3
KLMN 1.2
F’G’H’J’ 1.2
STUV 1.1
mm
•Picture Intermediate frequency
L’ ................................................ 33.9MHz
L, B/G, D/K .............................. 38.9MHz
•Sound Carrier Trap
L’ ................................................ 40.4MHz
L, D/K ......................................... 32.4MHz
B/G ............................................ 33.4MHz
•Adjacent Sound Carrier Trap
L’ ................................................ 32.4MHz
L, D/K, B/G ................................ 40.4MHz
•Adjacent Picture Carrier Trap
L’ ................................................ 41.9MHz
L, D/K ...................................... 30.9MHz
B/G ............................................ 31.9MHz
•Aerial Input Impedance
VHF/UHF ................. 75 ohm Unbalanced
•Tuning Ranges ..... 48.25MHz thru 855.25 MHz
VHF: S1 - S41 CH (Hiperband)
E2 - E12 / F2 - F10
UHF: E21 - E69
•White Level
Apply the rated voltage at the rated frequency to the TV set, while it is receiving full white pattern RF signal of 60
dB/µV from its RF input via the pattern generator.
Turn all picture controls to maximum value. Measure the colour temperatures at the center of the screen by
using the colour analyzer.
X=0.290 ± 0.015 Y=0.300 ± 0.015
Specifications are subject to change without prior notice.
MODEL DESTINATION (Operation Manual Languages)
21LF-90NES: Español, Português.
WARNING
The chassis in this receiver is partially hot. Use an isolation transformer between the line cord plug
and power receptacle, when servicing this chassis.
To prevent electric shock, do not remove cover. No user-serviceable parts inside. Refer servicing to
qualified service personnel.
3
21LF-90N
Only qualified service personnel are allowed to carry out maintenance and repair of this receiver.
Servicing of High Voltage System and CRT
It is important that the static charge is removed from the high voltage system when carrying out work on the
receiver. This can be achieved by connecting a 10K resistor (with a suitably insulated lead) from the CRT
cavity connector to the CRT ground tag. This must be carried out with the AC supply disconnected from the
receiver.
Note the following:
•
• If the CRT has to be changed it MUST be replaced with the correct type for continued safe working.
• DO NOT lift the CRT by its neck.
• When handing the CRT, ensure that shatterproof goggles are worn.
• Ensure that the CRT is discharge before handling.
IMPORTANT SERVICING NOTES
The CRT in this receiver employs Integral Implosion Protection.
X-Ray
This receiver is designed to keep any x-ray emission to an absolute minimum. Some fault conditions and
servicing procedures may produce potentially hazardous x-ray radiation levels. This is a problem when in
close proximity to the receiver for long periods of time. To reduce any risks associated with this, please
observe the following precautions:
1. When undertaking any servicing on this chassis, DO NOT increase the EHT to more than 30.0 KV, (at a
instantaneous beam current of 1300 µA).
2. Ensure that during normal operation the EHT does not exceed 25.55 KV (at a beam current of 1000 µA).
This level has been preset in the factory. Always check that this level has not been exceeded after
carrying out any repair on the receiver.
3. DO NOT replace the CRT with any other type than that specified in the parts listing as this may cause
excessive x-ray radiation.
Before returning the receiver to the customer
In addition to the above checks, the following should also be carried out before returning the receiver to the
customer.
1. Inspect all the leads to ensure that they are dressed correctly and that they are not obstructed or pinched
by any other parts.
2. Ensure that all protective devices are in good condition. These will include nonmetallic control knobs,
insulating fish papers, cabinets backs, compartment covers or shields, mechanical insulators, etc.
4
CONTROLS & TERMINALS
MENU
CH
21LF-90N
Speakers (left + right)
= Power On / Off
= Volume -/+
CH = Program -/+
MENU = Menu
VIDEO = VCR
AUDIO L = Audio left
AUDIO R = Audio right
= Headphone 3,6 mm Ø
1
= Stand By
2
= Cursor Up
3
= Cursor Right
4
OK = OK
5
= Info (Program Menu)
6
0 - 9 = Direct Program
7
-/-- = Double Digit
8
= Wide mode button
9
P/CH+ = Program +
10
+ = Volume +
11
= TV / Quit Menu
EXT
12
= EXT button
(SCART, F- AV, RGB)
13
Yellow = Feature Menu
14
Blue = Installation Menu
15
= Hold
16
= Update
17
= Index Page
18
= Reveal
19
= Expand
20
= Mix
21
= Teletext
22
= Time
23
Red = Sound Menu
24
Green = Picture Menu
25
= Mute
26
I-II = Mono/Stereo - Dual I-II
27
- = - Volume
28
- P/CH = -Program
29
= Flash back button
30
M = Menu
31
= Cursor Down
= Cursor Left
32
REMOTE CONTROL
5
21LF-90N
Mother Unit
CHASSIS LAYOUT
CRT Unit
Headphone Unit
6
21LF-90N
PARTS LISTING
REPLACEMENT PARTS
Replacement parts which have special safety characteristics are identified in
this manual. Electrical components having such features are identified by
in the Replacement Parts Listing.
The use of a substitute replacement part which does not have the same safety
characteristics as the factory recommended is not permitted.
Replacement parts not shown in this service manual may create shock fire, or
other hazards.
HOW TO ORDER REPLACEMENT PARTS
To have your order completed promptly and correctly please supply the following information.
1. MODEL NUMBER 2. REF. NO.
3. PART NO. (*) 4. DESCRIPTION
5. CODE 6. QUANTITY
(*) When ordering any part, a “V” should be added before the Part No.
(*)
REF No. PARTS DESCRIPTION SN CODE EX CODE
PICTURE TUBE
. 30017634 21" CPT TUBE SAFE EW FREE REALFLAT BW CQ
. 30028644 21 DEG COIL&EARTH CB. WO/UL FLAT SHARP AG AR
TUNER
TU201 30009637 TUNER WSP (PLL) 38.9 MK2 - BATCH AR BC
INTEGRATED CIRCUITS
IC101 30018063 IC HT48RA0A OTP AF AR
IC118 30001506 IC TL431 AC AH
IC301 30011824 IC TDA7266 AF AR
IC403 30026922 IC STV2248H (SHRINK56) AR BC
IC502 30001669 PREAMPLIFIER TFMS1380 AD AM
IC700 30013658 IC MSP3410G SDIP64 AS BD
IC800 30011968 IC SMPS MC44608 DIP8 AF AQ
IC801 30015087 IC SAFE OPTOCOUPLER TCET1102G AA AE
IC803 30001500 IC LM7808 AC AH
IC804 30001622 IC 7805 (1A) AB AF
IC806 30014346 IC 78L05 TO-92 (100mA) AA AE
TRANSISTORS
Q100 30001453 TR BC337 AA AC
Q601 30013656 TR POWER STX112-AP AA AE
Q804 30001454 TR BC548B AA AC
DIODES
D100 30002733 LED INFRARED IR333 AA AC
D1001 30003722 DIODE ZENER ZPD15V AA AA
D1003 30003722 DIODE ZENER ZPD15V AA AA
D106 30001377 DIODE ZENER 33V UZT 33B AB AF
D407 30001284 DIODE 1N4148 0.15A/100V 0.5A AA AB
D505 30001284 DIODE 1N4148 0.15A/100V 0.5A AA AB
D506 30001284 DIODE 1N4148 0.15A/100V 0.5A AA AB
D509 30001279 LED RED/GREEN LTL293SJ AC AH
D602 30001329 DIODE 1N4007 1A/1000V 30A AA AB
D608 30001318 DIODE BA159 1A/800V 20A AA AB
D609 30001318 DIODE BA159 1A/800V 20A AA AB
D610 30001318 DIODE BA159 1A/800V 20A AA AB
D614 30001318 DIODE BA159 1A/800V 20A AA AB
D620 30001349 DIODE ZENER 11V AA AB
D701 30001369 DIODE ZENER 3.6V ZPD AA AB
D800 30001318 DIODE BA159 1A/800V 20A AA AB
D801 30001347 DIODE ZENER 8.2V AA AB
D802 30001318 DIODE BA159 1A/800V 20A AA AB
D803 30001315 DIODE BYD33D 1A/200V 20A AA AE
D804 30001318 DIODE BA159 1A/800V 20A AA AB
D805 30009366 DIODE UF5402 3A/200V 150A AB AF
D806 30001315 DIODE BYD33D 1A/200V 20A AA AE
D808 30007681 DIODE UF5407 3A/800V 150A AB AF
REF No. PARTS DESCRIPTION SN CODE EX CODE
D809 30001329 DIODE 1N4007 1A/1000V 30A AA AB
D811 30001329 DIODE 1N4007 1A/1000V 30A AA AB
D813 30001329 DIODE 1N4007 1A/1000V 30A AA AB
D837 30001329 DIODE 1N4007 1A/1000V 30A AA AB
D838 30001329 DIODE 1N4007 1A/1000V 30A AA AB
D889 30001384 TR MCR22-6 AB AG
D890 30001329 DIODE 1N4007 1A/1000V 30A AA AB
D893 30001318 DIODE BA159 1A/800V 20A AA AB
D894 30001318 DIODE BA159 1A/800V 20A AA AB
D900 30001318 DIODE BA159 1A/800V 20A AA AB
D901 30001318 DIODE BA159 1A/800V 20A AA AB
D902 30001318 DIODE BA159 1A/800V 20A AA AB
D903 30001344 DIODE ZENER 6.2V 1/2W AA AB
D904 30001349 DIODE ZENER 11V AA AB
D905 30001349 DIODE ZENER 11V AA AB
D906 30001349 DIODE ZENER 11V AA AB
PACKAGED CIRCUITS
X100 30002852 XTAL REZ 455KHZ AA AD
X401 30001749 XTAL 4.433619 MHZ (AK15) AC AK
X402 30015592 XTAL 3.579545 (WO/LOAD CAP) AB AG
X403 30000074 CAP MKT 100NF 63V J AA AC
X501 30002851 XTAL 4MHZ L.C=30PF AC AH
X700 30001756 XTAL 18.432MHZ AE AP
COILS
L1001 30001996 FIXED COIL 22UH Q40 K AA AB
L1002 30001996 FIXED COIL 22UH Q40 K AA AB
L101 30013412 FERRITE BEAD (0805) MMZ2012Y152B AA AA
L110 30013412 FERRITE BEAD (0805) MMZ2012Y152B AA AA
L111 30013412 FERRITE BEAD (0805) MMZ2012Y152B AA AA
L112 30013412 FERRITE BEAD (0805) MMZ2012Y152B AA AA
L113 30013412 FERRITE BEAD (0805) MMZ2012Y152B AA AA
L114 30013412 FERRITE BEAD (0805) MMZ2012Y152B AA AA
L201 30001979 FIXED COIL 1UH Q45 M-A AA AB
L210 30001971 FERRITE BEAT (805) BLM21A601S AA AD
L211 30001971 FERRITE BEAT (805) BLM21A601S AA AD
L401 30001971 FERRITE BEAT (805) BLM21A601S AA AD
L402 30001992 FIXED COIL 10UH Q65 K-A AA AB
L403 30001971 FERRITE BEAT (805) BLM21A601S AA AD
L404 30001990 FIXED COIL 6.8UH Q75 K AA AB
L405 30014048 ADJ.COIL VIF 44MHZ Q=64 C=39pF AA AE
L406 30001971 FERRITE BEAT (805) BLM21A601S AA AD
L407 30002002 FIXED COIL 47UH Q60 K AA AB
L603 30018501 LINEARITY COIL 100UH AB AG
L700 30001971 FERRITE BEAT (805) BLM21A601S AA AD
L701 30001971 FERRITE BEAT (805) BLM21A601S AA AD
L702 30001996 FIXED COIL 22UH Q40 K AA AB
L703 30001979 FIXED COIL 1UH Q45 M-A AA AB
L704 30001979 FIXED COIL 1UH Q45 M-A AA AB
L802 30001971 FERRITE BEAT (805) BLM21A601S AA AD
L803 30000580 RES CF 1/4W 22R J AA AB
L805 30001971 FERRITE BEAT (805) BLM21A601S AA AD
L806 30001971 FERRITE BEAT (805) BLM21A601S AA AD
L807 30001992 FIXED COIL 10UH Q65 K-A AA AB
CERAMIC FILTERS
Z401 30012545 FILTER SAW K9656M AG AR
Z402 30014261 FILTER SAW K3958M AF AR
Z404 30001724 FILTER SER TRAP TPS 5.5MHZ AB AF
TRANSFORMERS
TR601 30017788 TRF FBT SAFE 90ø (AK30,AK36 LAYER TYPE) AT BE
TR801 30002100 LINE FILTER SAFE 2*27MH AC AH
TR802 30027707 TRF SMPS AK44 RF (170-270V) Audio=14V AF AQ
CAPACITORS
7
21LF-90N
REF No. PARTS DESCRIPTION SN CODE EX CODE
C100 30000352 CAP EL 100UF 16V M AA AB
C201 30000400 CAP EL 47UF 50V M AA AB
C205 30000371 CAP EL 22UF 50V M AA AB
C300 30000400 CAP EL 47UF 50V M AA AB
C302 30000092 CAP MKT 220NF 63V J AA AD
C305 30000092 CAP MKT 220NF 63V J AA AD
C404 30000225 CAP CER 220PF 50V J SL AA AB
C409 30000345 CAP EL 10UF 50V M AA AB
C410 30000384 CAP EL 2.2UF 50V M AA AB
C411 30000345 CAP EL 10UF 50V M AA AB
C413 30000362 CAP EL 1UF 50V M AA AB
C416 30000362 CAP EL 1UF 50V M AA AB
C417 30000362 CAP EL 1UF 50V M AA AB
C419 30000413 CAP EL 4.7UF 50V M AA AB
C420 30000100 CAP MKT 330NF 63V J AA AD
C422 30000400 CAP EL 47UF 50V M AA AB
C423 30000400 CAP EL 47UF 50V M AA AB
C424 30000345 CAP EL 10UF 50V M AA AB
C431 30000362 CAP EL 1UF 50V M AA AB
C433 30000345 CAP EL 10UF 50V M AA AB
C436 30000109 CAP MKT 470NF 63V J AA AD
C440 30000074 CAP MKT 100NF 63V J AA AC
C442 30000362 CAP EL 1UF 50V M AA AB
C443 30000362 CAP EL 1UF 50V M AA AB
C444 30000384 CAP EL 2.2UF 50V M AA AB
C446 30000345 CAP EL 10UF 50V M AA AB
C460 30000345 CAP EL 10UF 50V M AA AB
C502 30000396 CAP EL 47UF 16V M AA AB
C513 30000371 CAP EL 22UF 50V M AA AB
C519 30000352 CAP EL 100UF 16V M AA AB
C531 30000384 CAP EL 2.2UF 50V M AA AB
C536 30000074 CAP MKT 100NF 63V J AA AC
C541 30000109 CAP MKT 470NF 63V J AA AD
C542 30000205 CAP CER 150PF 50V J SL AA AB
C543 30000205 CAP CER 150PF 50V J SL AA AB
C603 30000384 CAP EL 2.2UF 50V M AA AB
C604 30000400 CAP EL 47UF 50V M AA AB
C608 30000107 CAP MKT 47NF 250V J AA AD
C610 30018901 CAP EL 100UF 50V M 105° AA AB
C611 30000092 CAP MKT 220NF 63V J AA AD
C613 30000078 CAP MKT 1UF 100V M AB AF
C615 30000359 CAP EL 1000UF 16V M AA AC
C616 30000400 CAP EL 47UF 50V M AA AB
C618 30000134 CAP MKP SAFE 11NF 2000V %3.5 AC AH
C619 30000131 CAP MKP SAFE 100NF 250V J AA AB
C624 30000350 CAP EL 10UF 250V M AA AD
C627 30006750 CAP MKP 220NF 400V J AA AD
C628 30018380 CAP EL 3.3UF 160V M 105° AA AB
C631 30000410 CAP EL 470UF 50V M AB AF
C632 30000100 CAP MKT 330NF 63V J AA AD
C634 30000409 CAP EL 470UF 25V M AA AD
C635 30000100 CAP MKT 330NF 63V J AA AD
C636 30000400 CAP EL 47UF 50V M AA AB
C641 30000345 CAP EL 10UF 50V M AA AB
C643 30000116 CAP MKT 68NF 63V J AA AC
C644 30000362 CAP EL 1UF 50V M AA AB
C705 30000345 CAP EL 10UF 50V M AA AB
C706 30000345 CAP EL 10UF 50V M AA AB
C712 30000345 CAP EL 10UF 50V M AA AB
C720 30000345 CAP EL 10UF 50V M AA AB
C724 30000345 CAP EL 10UF 50V M AA AB
C730 30000393 CAP EL 3.3UF 50V M AA AB
C733 30000345 CAP EL 10UF 50V M AA AB
C734 30000345 CAP EL 10UF 50V M AA AB
C736 30000345 CAP EL 10UF 50V M AA AB
C737 30000371 CAP EL 22UF 50V M AA AB
REF No. PARTS DESCRIPTION SN CODE EX CODE
C738 30000371 CAP EL 22UF 50V M AA AB
C801 30000094 CAP MKT SAFE 220NF 275V M AC AA AB
C802 30000094 CAP MKT SAFE 220NF 275V M AC AA AB
C803 30000433 CAP CER 1NF 1KV M B AA AB
C805 30018085 CAP VAR SAFE 510V K MFCN14D511 AA AD
C806 30000433 CAP CER 1NF 1KV M B AA AB
C808 30000295 CAP CER 100NF 50V Z F AA AB
C809 30000420 CAP EL 150UF 400V M AF AQ
C810 30000400 CAP EL 47UF 50V M AA AB
C811 30000161 CAP MKP SAFE 47NF 630V J AB AE
C813 30000295 CAP CER 100NF 50V Z F AA AB
C816 30000440 CAP CER SAFE 2.2NF 4KV M AA AC
C817 30000198 CAP CER 120PF 500V J SL AA AB
C822 30007308 CAP CER 220PF 1KV K (PULSE) AA AD
C824 30009208 CAP CER 470PF 1KV K (PULSE) AA AC
C827 30000411 CAP EL 4700UF 16V M AC AH
C828 30000295 CAP CER 100NF 50V Z F AA AB
C829 30000359 CAP EL 1000UF 16V M AA AC
C830 30000382 CAP EL 2200UF 16V M AB AF
C832 30000295 CAP CER 100NF 50V Z F AA AB
C833 30000407 CAP EL 470UF 16V M AA AC
C834 30000295 CAP CER 100NF 50V Z F AA AB
C836 30000431 CAP CER 100PF 1KV M AA AC
C838 30000352 CAP EL 100UF 16V M AA AB
C839 30000352 CAP EL 100UF 16V M AA AB
C840 30000352 CAP EL 100UF 16V M AA AB
C843 30000431 CAP CER 100PF 1KV M AA AC
C848 30000352 CAP EL 100UF 16V M AA AB
C849 30000352 CAP EL 100UF 16V M AA AB
C850 30000352 CAP EL 100UF 16V M AA AB
C855 30000407 CAP EL 470UF 16V M AA AC
C859 30013533 CAP CER 100PF 1KV K (PULSE) AA AC
C862 30000367 CAP EL 1UF 250V M AA AB
C864 30000440 CAP CER SAFE 2.2NF 4KV M AA AC
C907 30000434 CAP CER 1NF 2KV K B AA AB
C908 30000415 CAP EL 4.7UF 250V M AA AC
C912 30000075 CAP MKT 100NF 250V K (DC) AA AD
RESISTORS
R1001 30000492 RES CF 1/4W 120R J AA AA
R1002 30000492 RES CF 1/4W 120R J AA AA
R105 30000792 RES CF 1/4W 75R J AA AB
R127 30000459 RES CF 1/4W 100R J AA AB
R204 30000459 RES CF 1/4W 100R J AA AB
R206 30000459 RES CF 1/4W 100R J AA AB
R301 30000471 RES CF 1/4W 10K J AA AB
R302 30000471 RES CF 1/4W 10K J AA AB
R407 30000590 RES CF 1/4W 2.2K J AA AB
R410 30000590 RES CF 1/4W 2.2K J AA AB
R420 30000466 RES CF 1/4W 1K J AA AB
R424 30000712 RES CF 1/4W 470R J AA AB
R428 30000792 RES CF 1/4W 75R J AA AB
R437 30000466 RES CF 1/4W 1K J AA AB
R438 30000466 RES CF 1/4W 1K J AA AB
R442 30000466 RES CF 1/4W 1K J AA AB
R450 30000712 RES CF 1/4W 470R J AA AB
R469 30000670 RES CF 1/4W 330K J AA AB
R507 30000466 RES CF 1/4W 1K J AA AB
R508 30000622 RES CF 1/4W 270R J AA AB
R510 30000737 RES CF 1/4W 5.1K J AA AB
R513 30000459 RES CF 1/4W 100R J AA AB
R514 30000459 RES CF 1/4W 100R J AA AB
R518 30000471 RES CF 1/4W 10K J AA AB
R525 30000583 RES CF 1/4W 220R J AA AB
R527 30000718 RES CF 1/4W 4.7K J AA AB
R534 30000526 RES CF 1/4W 1.5K J AA AB
8
21LF-90N
REF No. PARTS DESCRIPTION SN CODE EX CODE
R535 30000718 RES CF 1/4W 4.7K J AA AB
R536 30000471 RES CF 1/4W 10K J AA AB
R546 30000560 RES CF 1/4W 1.8K J AA AB
R559 30000470 RES CF 1/2W 10K J AA AA
R562 30000471 RES CF 1/4W 10K J AA AB
R601 30000752 RES CF 1/4W 56K J AA AB
R602 30000820 RES CF 1/4W 82K J AA AB
R605 30000513 RES CF 1/4W 130K J AA AB
R623 30000607 RES CF 1/4W 2.2R J AA AB
R624 30001120 RES MO 2W 22R J AA AB
R625 30000900 RES MF 1/4W 1.8K J AA AB
R627 30000910 RES MF 1/2W 1.8R G AA AB
R630 30000828 RES CF 1/4W 8.2M J AA AB
R631 30000885 RES MF 1/4W 1.5K J AA AB
R633 30000650 RES CF 1/4W 33R J AA AB
R637 30000621 RES CF 1/2W 270R J AA AB
R638 30000589 RES CF 1/2W 2.2K J AA AA
R639 30000718 RES CF 1/4W 4.7K J AA AB
R645 30018904 RES MO 5W 4.7k J AA AD
R646 30014941 RES CF 1/4W 16K J AA AA
R647 30000466 RES CF 1/4W 1K J AA AB
R648 30001216 RES FUSE 1W 1.2R J AA AA
R649 30014941 RES CF 1/4W 16K J AA AA
R650 30000744 RES CF 1/4W 560R J AA AB
R654 30000458 RES CF 1/2W 100R J AA AB
R655 30000705 RES CF 1/2W 47R J AA AB
R659 30001151 RES MO 3W 330R J AA AD
R662 30000712 RES CF 1/4W 470R J AA AB
R663 30000459 RES CF 1/4W 100R J AA AB
R666 30001077 RES MO 2W 10R J AA AC
R701 30000459 RES CF 1/4W 100R J AA AB
R703 30000459 RES CF 1/4W 100R J AA AB
R705 30000459 RES CF 1/4W 100R J AA AB
R801 30000982 RES MF 1/4W 4.7K J AA AA
R804 30000504 RES CF 1/4W 120K J AA AB
R805 30000843 RES MF 1/4W 10R J AA AB
R806 30000982 RES MF 1/4W 4.7K J AA AA
R807 30001159 RES MO 1W 0.33R J AA AB
R810 30001257 RES MG SAFE 1/2W 4.7M J AA AD
R811 30000594 RES CF 1/4W 22K J AA AB
R813 30000718 RES CF 1/4W 4.7K J AA AB
R815 30000452 RES CF 1/4W 10R J AA AB
R817 30001037 RES MF 1/4W 99K F AA AB
R818 30006463 RES MF 1/4W 2K F AA AA
R819 30000810 RES CF 1/4W 820R J AA AB
R821 30000470 RES CF 1/2W 10K J AA AA
R828 30001265 NTC MONITOR 10R/3A SCK-103 AA AB
R829 30000718 RES CF 1/4W 4.7K J AA AB
R836 30001224 RES FUSE SAFE 1/2W 0.22R J AA AB
R900 30006712 FERRITE BEAD 3.5X4.7X0.8 AA AB
R901 30006712 FERRITE BEAD 3.5X4.7X0.9 AA AB
R902 30006712 FERRITE BEAD 3.5X4.7X0.10 AA AB
R903 30000886 RES MF 1/4W 1.5K F AA AB
R904 30000886 RES MF 1/4W 1.5K F AA AB
R905 30000886 RES MF 1/4W 1.5K F AA AB
R906 30000525 RES CF 1/2W 1.5K J AA AB
R919 30001213 RES FUSE 1/4W 1R J AA AA
MISCELLANEOUS PARTS
F801 20000848 FUSE ASSY.TK79-A (2.5A) AA AD
JK1 30027655 JACK RCA 1P WHITE SHARP (AK44) AA AC
JK100 30001900 JACK HEADPHONE HP01/2/3/4/5/6 AD AM
JK100 30027656 JACK RCA 1P RED SHARP (AK44) AA AC
JK2 30027654 JACK RCA 1P YELLOW SHARP (AK44) AA AC
NOT1 30009849 CABL 1P/70 SIS AA AB
PL100 30001829 CONN HEADER 2P 2.5MM TOP WHT SD AA AB
REF No. PARTS DESCRIPTION SN CODE EX CODE
PL100 30017791 CONN.ASSY.2/25 WHITE SI EXT.SPK&NELTRON AA AD
PL100 30017953 CONN MALE 5P SIDE WHITE AA AA
PL100 30018454 CONN HEADER 2P 2.5MM TOP BLACK AA AA
PL100 30027658 CNAS 2P+3P/300 W/C BLK&WHT UL1007AWG24 AB AF
PL101 30015053 SOCKET SCART NEW TYPE AB AF
PL105 30001830 CONN HEADER 2P 2.5MM TOP BLUE SD AA AB
PL107 30001835 CONN HEADER 3P 2.5MM TOP WHT SD AA AB
PL109 30015192 CONN HEADER 2P 2.5MM TOP YELLOW SD AA AA
PL110 30001830 CONN HEADER 2P 2.5MM TOP BLUE SD AA AB
PL110 30027659 CNAS 2P/150 W/DC SHL BLUE AC AH
PL115 30001835 CONN HEADER 3P 2.5MM TOP WHT SD AA AB
PL115 30002251 CNAS 3P/280 SHL W/DC UL2547AWG24 AB AF
PL301 30001829 CONN HEADER 2P 2.5MM TOP WHT SD AA AB
PL302 30018454 CONN HEADER 2P 2.5MM TOP BLACK AA AA
PL405 30006709 CONN HEADER 5P 2.5MM TOP WHT SD AA AB
PL407 30001836 CONN HEADER 3P 2.5MM TOP BLACK SD AA AB
PL501 30001783 CONN HEADER 5P 2.5MM TOP BD AA AC
PL503 30009085 CABLE 1P R2.6 35 W/CLIPS AA AC
PL504 30019101 CABL 1P/350 DIS UL1672AWG22 AA AB
PL601 30001827 CONN HEADER 4P 5/7.5MM TOP WHT AA AD
PL602 30006660 CONN HEADER 4P 2.5MM TOP WHT SD AA AB
PL801 30001792 CONN HEADER 2P 7.5MM TOP WHT AA AC
PL802 30001795 CONN HEADER 3P 5/7.5MM TOP WHT AA AC
PL900 30016695 CNAS 5P/450 FLT W/C+CBLH UL2468AWG24 AB AE
PL902 30016694 CNAS 4P/450 FLT W/C+CBLH UL2468AWG24 AA AE
PL903 30001855 SOCKET CRT SAFE NARROWNECK W/GND AD AM
SG900 30000428 SPARK GAP 300V AB AG
SG901 30000428 SPARK GAP 300V AB AG
SG902 30000428 SPARK GAP 300V AB AG
SW506 30016022 SWITCH TACT VERTICAL T&R AA AB
SW507 30016022 SWITCH TACT VERTICAL T&R AA AB
SW508 30016022 SWITCH TACT VERTICAL T&R AA AB
SW509 30016022 SWITCH TACT VERTICAL T&R AA AB
SW510 30016022 SWITCH TACT VERTICAL T&R AA AB
SW801 30017848 SWITCH SAFE ON/OFF 4A/128A JVC AC AH
TH800 30001268 THERMISTOR 3P AD AM
. 20092581 CABLE ASSY.4/45 (HRZ&VER) IMPROVED NEW AB AF
. 20141421 CRT B.ASSY.TP44-RF/SF (AK44) AQ BA
. 20141673 CRT B.ASSY.TP44-OTO RF/SF (AK44) AD AN
. 20143374 IC 24C08 U00125110210121202 AB AE
. 20145022 CHS.ASSY.44-512B215132231E BM CC
. 20146661 MD.ASY.HP44-STEREO (HP+FAV) (AK44) AE AP
. 20151167 SPK.AS.2163 SHARP STR (AK44) AR BC
. 20151168 SPK.AS.2163 SHARP (R) (AK44) AM AX
. 20151169 SPK.AS.2163 SHARP (L) (AK44) AM AX
. 20151304 POWER CORD ASSY.(2.4MT W/FTZ)(AK44SHARP) AD AM
. 20157066 PR.IC.36/44-SHARP 36_44_A17 AU BF
. 20069673 FIRE BARRIER (I) (NATURAL-V.O.)(AK30) AA AC
. 30001386 TR MTP6N60E (PLASTIC) AE AP
. 30001448 TR BU808DFI AF AQ
. 30001731 FUSE SAFE 2.5A 250V 5*20MM AA AC
. 30001793 CONN HOUSING 2P 7.5MM TOP AA AD
. 30006987 IC 24C08 (WP) AC AH
. 30007248 CONN HOUSING 4P 3.96MM TOP WHT AA AB
. 30009366 DIODE UF5402 3A/200V 150A AB AF
. 30009783 SOCKET IC 56P (SHRINK) AC AH
. 30009784 SOCKET IC 8P (DIP) AA AB
. 30014568 TERMINAL SSC 2000T AA AB
. 30017855 CONN.ASSY.4/45 (HRZ&VER) IMPROVED NEW AB AF
. 30018426 CNAS 2P/690 SIS W/BLK C+FER UL1007AWG24 AB AF
. 30018427 CNAS 2P/500 SPK SIS W/C+FER UL1007AWG24 AB AF
. 30025172 IC TDA6107JF/N3 AF AQ
. 30026954 PCB 11UK12 AB AF
. 30027134 SPEAKER 16R 4W F/R 50x120MM-21" SHARP AF AR
. 30028208 POWER CORD SAFE EURO 2.2M SHARP W/FILTER AG AT
. 35000136 FUSE HOLDER TK79-A (GRAY) AA AD
9
21LF-90N
REF No. PARTS DESCRIPTION SN CODE EX CODE
ARTWORK
. 20141199 SCR.ASSY.2163 HP (2SP) AC AK
. 20143026 R/C 1548 SHARP (EKO2GRAY/I) (GRAY/S) AM AY
. 35000158 NUT C ZN BOTTOM M3 AA AB
. 35000165 KNURL WASHER C ZNSY 3*6*04 (M3) AA AB
. 35000180 SCREW C ZN YSMB M3*6 AA AA
. 35000181 SCREW C ZN YSMB M3*8 AA AB
. 35000182 SCREW C ZN YSMB M3*10 AA AA
. 35000224 SCREW C SK ZN YFMB 2.9*9.5 AA AB
. 35004572 SCREW P C AgSYF YSB 4x20 AA AB
. 35005084 SCREW C ZN RYAKB 6x30 AA AB
. 35005418 SCREW P C ZN YSB 3.5x10 (KN1031 T35X10) AA AA
. 35008081 SCREW P C ZN YFMB 3*9.5 AA AA
. 35008812 SCREW P C ZN RYSB 3x10 AA AB
. 35009300 SCREW P C SYF RYSB 4*11 AA AB
. 40016817 LOGO SHARP (D.C.-SILVER)21"RF AC AH
. 50043630 WARRANTY CARD SHARP (ESP) AB AF
. 50043894 CONTROL STICKER STREO 2163RF SHARP AD AN
. 50048335 CARTON BOX SHARP SHARP (2163) AL AX
. 50048448 I/B SHARP 21LF90N(ES) P/AK44/1548/ES/POR AD AL
COSMETICS
. 20140383 BACK CVR.2163RF EKO2GRAY (AK44) AQ BA
. 20140387 SNOW BOX TOP 2163RF SHARP AA AA
. 20140388 SNOW BOX BOTTOM 2163RF SHARP AA AA
. 20141198 BUTTON ASSY 2163 (SLV285S/P) AC AK
. 20141200 SNOW BOX ASSY 2163 AA AA
. 20146997 CONTROL PAN.DOOR 2163RF SHARP SLV285S(P) AD AM
. 20151084 FRONT2163AV/3H W/H&J SLV285S(P)(PW/S)2SK AR BC
. 40012331 RUBBER PAD (RC 1542) AD AL
. 40016859 RUBBER WASHER 2163RF (I) SHARP AA AB
. 40016871 DOOR SPACER (M10) AA AA
10
21LF-90N
How to update the Technical Information appeared on this Service Manual
1. Web site: https://www.vestelservice.com
2. Select: Technical Support
3. Login: 101278
4. Password: SHPII278
By this access you can consult the latest schematic diagram or request the Parts Listing of a concrete Production
Date / Serial Number.
By this way it can be also consulted the issued Technical Reports (Service Bulletins).
11
21LF-90N
No part of this publication may be reproduced,
stored in a retrieval system, or transmitted in any
form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, without
prior written permission of the publisher.
Technical information and Production:
Vestel Electronik AS
PRINTED BY: ON:
Technical information re-issued:
SHARP ELECTRONICA ESPAÑA S.A.
Service Manual Group
Engineering Dept.
Polígono Industrial Can Sant Joan
08190 Sant Cugat del Vallès
Barcelona
Spain
Think Ecology, please use
RECYCLED PAPER
12
AK - 44
CHASSIS
SERVICE MANUAL
SE00AK44CHA00
Issued: 9th March 2004
PAL B/G, I / SECAM L/L’, B/G, D/K SYSTEM COLOUR TELEVISION
CHASSIS AK-44
In the interests of user safety (required by safety
regulations in some countries) the set should be restored to its original condition and only parts identical to those specified should be used.
CONTENTS
TABLE OF CONTENTS ....................................................................................................... 3
INTRODUCTION .................................................................................................................. 6
CIRCUIT DESCRIPTIONS ................................................................................................... 6
INTEGRATED CIRCUIT DESCRIPTIONS ....................................................................... 13
BLOCK DIAGRAM ................................................................................................................ 22
SERVICE MODE ADJUSTMENTS ...................................................................................... 23
HOTEL MODE FUNCTIONS ................................................................................................ 30
CIRCUIT DIAGRAMS ..................................................................................................... 31
HOW TO UPDATE THE TECHNICAL INFORMATION ...................................................... 41
SHARP CORPORATION
1
This document has been published to
be used for after sales service only.
AK - 44
CHASSIS
SERVICE MANUAL UPDATE LOG SHEET
Technical Report No.
Technical Bulletin No.
Cause / Solution
Part No.
Page No.
Application
Data /Serial No.
Use this page to keep any special servicing information as Technical Report (Bulletin), Technical Information, etc.
If only part number changes are required, just change part number directly the part number in the Parts Listing Section.
If you need more information, please refer to the Technical Report (Bulletin).
2
AK - 44
CHASSIS
TABLE OF CONTENTS
SAFETY PRECAUTIONS ............................................................................................................................................... 5
TV set switched off ............................................................................................................................................... .....5
Measurements ....................................................................................................................................................... 5
PERI-TV SOCKET ........................................................................................................................................................... 5
SCART 1........................................................................................................................................................................... 5
1. INTRODUCTION ......................................................................................................................................................... 6
CIRCUIT DESCRIPTIONS ............................................................................................................................................. 6
2. SMALL SIGNAL PART WITH STV2248 ..................................................................................................................... 6
2.1 Vision IF amplifier ........................................................................................................................................... 6
2.2 QSS Sound circuit (QSS versions) ................................................................................................................. 6
2.3 AM Demodulator ........................................................................................................................................... 6
2.4 FM demodulator and audio amplifier (mono versions) .................................................................................. 6
2.5 Video switch ................................................................................................................................................... 6
2.6 Synchronisation circuit .........................................................................................................................................6
2.7 Chroma and luminance processing ................................................................................................................ 7
2.8 RGB output circuit .......................................................................................................................................... 7
2.9 µ-Controller .................................................................................................................................................... 8
2.9.1 Controls .............................................................................................................................................. 8
2.9 .2 Teletext ............................................................................................................................................. 8
2.10 Video Path ..................................................................................................................................................... 9
2.11 Sound Path .................................................................................................................................................. 9
2.12 AV Input Signal Path ..................................................................................................................................... 9
2.12.1 Video and Sound ............................................................................................................................ 9
2.12.2 RGB ................................................................................................................................................ 9
3. TUNER ....................................................................................................................................................................... 9
4. DIGITAL TV SOUND PROCESSOR MSP34X0 ........................................................................................................ 10
5. SOUND OUTPUT STAGE TDA7266L/TDA7266 ...................................................................................................... 10
6. VERTICAL OUTPUT STAGE WITH TDA8174A ....................................................................................................... 10
7. VIDEO OUTPUT AMPLIFIER TDA6107 ................................................................................................................... 11
8. POWER SUPPLY (SMPS) .......................................................................................................................................... 11
8.1 Start Up ......................................................................................................................................................... 11
8.2 Voltage Regulation .......................................................................................................................................... 11
8.3 Voltage Protection .......................................................................................................................................... 11
8.4 Current Regulation .......................................................................................................................................... 11
8.5 Standby operation .......................................................................................................................................... 12
8.6 Mode transition ............................................................................................................................................. 12
8.7 SMPS Switch Off .......................................................................................................................................... 12
9. LINE CIRCUIT ............................................................................................................................................................ 12
9.1 B.C.L. Circuit (Beam Current Limiter) ........................................................................................................... 13
10. SERIAL ACCESS CMOS 8K EEPROM 24C08 ...................................................................................................... 13
11. SAW FILTERS .......................................................................................................................................................... 13
12. IC DESCRIPTIONS AND INTERNAL BLOCK DIAGRAM ..................................................................................... 13
ST92195 ................................................................................................................................................................ 14
STV224X ............................................................................................................................................................... 15
UV1315, UV1316, UV1336 .................................................................................................................................. 15
TDA7266/TDA7266L .......................................................................................................................................... 17
TDA8174 ..................................................................................................................................................................18
TDA6107 ................................................................................................................................................................ 18
MC44608 .................................................................................................................................................................19
MSP34X0G ..............................................................................................................................................................19
24C08 .................................................................................................................................................................... 20
3
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CHASSIS
TDA1308 ................................................................................................................................................................ 21
SAW FILTERS ....................................................................................................................................................... 21
13. GENERAL BLOCK DIAGRAM of 11AK44 ..................................................................................................................22
14. SERVICE MENU ...................................................................................................................................................... 23
14.1 Service Menu entrance ................................................................................................................................ 23
14.2 Service Adjustments ................................................................................................................................... 23
14.3 Using Coloured Buttons .............................................................................................................................. 24
14.3.1 AVL ............................................................................................................................................... 24
14.3.2 Geometry Menu ............................................................................................................................. 25
14.3.2.1 Geometry Table ................................................................................................................ 25
14.3.2.1 Geometry Table ................................................................................................................ 25
14.3.3 Screen Adjustment ...................................................................................................................... 26
14.3.4 IF Adjustment ................................................................................................................................ 26
14.4 Auto Programming System Set Up ............................................................................................................. 25
15. OPTIONS ................................................................................................................................................................... 27
15.1 Service Registers updating regarding the Tuner ...................................................................................... 27
15.2 Registers details ......................................................................................................................................... 28
16. LANGUAGES ......................................................................................................................................................... 30
17. HOTEL MODE FUNCTIONS ................................................................................................................................... 30
18. SCHEMATIC DIAGRAMS ........................................................................................................................................ 31
19. HOW TO UPDATE THE TECHNICAL INFORMATION ........................................................................................ 41
4
AK - 44
CHASSIS
SAFETY PRECAUTIONS
The service of this TV set must be carried out by qualified persons only. Components marked with the warning symbol
on the circuit diagram or on the Parts Listing, are critical for safety and must only be replaced with an identical component.
- Power resistor and fused resistors must be mounted in an identical manner to the original component.
- When servicing this TV, check that the EHT does not exceed 26kV.
TV set switched off:
Make short-circuit between HV-CRT clip and CRT ground layer.
Short C809 before changing IC800 and IC801 or other components in primary side of the SMPS part.
Do not try to test Q801 gate source junction if C809 is charged, your meter will turn on the transistor which will discharge
the capacitor resulting in a drain source short circuit. Do not discharge C809 quickly with a screwdriver etc. The very
high current produced can damage the internal connections of the capacitor causing failure at a later date. Remember
when checking voltages to use a return path on the same side of TR802 for the Voltmeter earth to obtain the correct
readings.
Measurements:
Voltage readings and oscilloscope traces are measured under the following conditions:
Antenna signal’s level is 60dB at the color bar pattern from the TV pattern generator. (100% white, 75% color saturation)
Brightness, contrast, and color are adjusted for normal picture performance.
Mains supply, 220VAC, 50Hz.
DO NOT CHANGE ANY MODULE UNLESS THE SET IS SWITCHED OFF
The mains supply part of the switch mode power supply’s transformer is live.
Use an isolating transformer.
The receiver complies with the safety requirements.
PERI-TV SOCKET
2
4
6
8
10
12
14
16
18
20
21
19
13
15
17
7
9
11
SCART PINING
1 Audio right output 0.5 Vrms / 1K
2 Audio right input 0.5 Vrms / 10K
3 Audio left output 0.5 Vrms / 1K
4 Ground AF
5 Ground Blue
6 Audio left input 0.5 Vrms / 10K
7 Blue input 0.7 Vpp / 75 ohm
8 AV switching input 0-12 VDC / 10 K
9 Ground Green
10 11 Green input 0.7 Vpp / 75 ohm
12 13 Ground Red
14 Ground Blanking
15 Red input 0.7 Vpp / 75 ohm
16 Blanking input 0-0.4 VDC, 1-3 VDC / 75 Ohm
17 Ground CVBS output
18 Ground CVBS input
19 CVBS output 1 Vpp / 75 ohm
20 CVBS input 1 Vpp / 75 ohm
21 Ground
1
3
5
21
5
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