JVC AV28X25EIGY, AV28X25EKGY, AV28X25EUS, AV32X250EUS, AV32X25EIGY Service Manual

...

AV32X25EUS / AV32X250EU

AV32X25EIGY / AV32X25EKG

AV28X25EUS / AV28X25EIG

SERVICE MANUAL

COLOUR TELEVISION

AV28X25EKG

BAS IC CHASSIS

AV32X25EUS / AV32X250EUS AV32X25EIGY / AV32X25EKGY

AV28X25EUS / AV28X25EIGY

AV28X25EKGY

ⅡⅡⅡⅡ

! SPECIFICATIONS ････････････････････････････････ ! SAFE TY PRECAUT IONS ････････････････････････････････ !

FEATURES････････････････････････････････

MAIN DIFFERENCE LIST ････････････････････････････････

! FUNCTIONS ････････････････････････････････ !

SPECIFIC SERVICE INSTRUCTIONS

! SERVICE ADJUSTMENTS ････････････････････････････････ !

PARTS LIST

★

OPERATING INSTRUCTIONS

★

STAND ARD CIRCUIT DIAGRAM

････････････････････････････････････････････････････････････････

･････････････････････････････････････････････････････････････

････････････････････････････････････････････････････････････････

･･･････････････････････････････････････････････････････

････････････････････････････････････････････････････････････････

･･･････････････････････････････････

････････････････････････････････････････････････････････････････

･･･････････････････････････････････････････････････････

････････････････････････････････････････････････････････････････

････････････････････････････････

･････････････････････････････････････････････

････････････････････････････････････････････････････････････････

･････････････････････････････････････････････････････

････････････････････････････････････････････････････････････････

････････････････････････････････

････････････････････････････････････････････････････････････････

････････････････････････････････

････････････････････････････････････････････････

････････････････････････････････････････････････････････････････

･････････････････････････････ 2

･･････････････････････････････････････････････････････････

･･････････････････････････････････

････････････････････････････････････････････････････････････････

････････････････････････････････････

････････････････････････････････････････････････････････････････

･･･････････････････････ 4

･･････････････････････････････････････････････

･･･ 6

･･････

･･･････････････････････ 6

･･････････････････････････････････････････････

･･ 7

････

･････････････

･･････････････････････････

･････････････････････ 14

･･････････････････････････････････････････

････････････････

････････････････････････････････

2- 1

No.519 94 Jun. 2002

V32X25EUS / AV32X250EUS

(

V32X25EIGY / AV32X25EKGY V28X25EUS / AV28X25EIGY V28X25EKGY

SPECIFICATIONS

Item

AV32 X2 5E US / AV3 2X2 50 EUS / AV28X25E US

Content

AV32 X2 5EIG Y / AV28 X25EIG Y

AV32 X2 5EK GY / AV 28X 25EKGY

32 ”) : 85. 5cm×55.0cm×56 .8c m

(28 ”) : 78. 0cm×50.9cm×49 .9c m

Mass (32 ”) : 54. 2k g / (28” ) : 40.2kg (32”) : 54. 2kg / ( 28” ) : 40. 2k g

TV RF Syste m CCIR ( B /G, D/ K, L, L’,I) CCIR ( I )

Colour Sy stem PA L / SEC A M / NTSC ( Only in EXT mo de ) PA L / NTSC (On ly in EXT mode)

Stere o Sy st em

Teletext System Fastext (UK syst em) / TOP (German syst em)

Receiving Frequency

Intermediate Frequency

Colour Sub Carr ier Fr eq.

Power Input

Power Consumpti on

Aerial Input Term

Picture Tube

Hi gh Vo l t ag e 31.0kV (at zero beam current)

Speake r

Au dio Output 7.5 W + 7.5 W

EX T-1 /EXT -2/E XT-3 ( I N/ OUT)

EXT-4 (Input)

A2 (B /G, D/ K) / NICAM (B/G, I, D/K, L) NICAM ( I )

WST(world standard system)

VHF : 47 MHz ～ 470MHz VHF : 47MHz ～ 470MHz ( EI model )

UHF : 470MHz ～ 86 2MHz UHF : 47 0MHz ～ 86 2 MHz ( EK / E I model )

• Fr enc h c able TV c han n el of br oa dcas t

fr eq ue ncies 1 16～ 1 72MH z & 220～ 46 9MH z

VIF Carr ier : 3 8.9MHz(B/G, D / K, I , L ) / 33.95MHz VIF C arr ier : 3 8. 9MHz

SIF Car r i er : 33 .4MH z(5.5 MHz : B/G ) SIF Carrier : 32.9MHz (6.0MHz )

32 .9 MHz( 6. 0MHz : I )

32 . 4MHz(6. 5MHz : L, D/K)

40.45 MHz ( 6 .5MH z : L ’)

PAL : 4.43 MHz PAL : 4. 43MH z

SE CAM : 4.40625MHz / 4.25MHz

NT S C : 3.58MHz / 4.43MHz NT S C : 3.58MHz / 4.43MHz

AC 2 20V～2 40V , 50Hz

187W (Max)

(32") (28 ” ) (32") (28”)

132W (Avg)

75 Ωun ba l anc ed, C oaxial

(32 ”) : V i ew ab l e ar e a 7 6cm ( meas ured di ag on ally)(32”) : V iewable are a 7 6cm ( meas ured di agon all

(28 ”) : V i ew ab l e ar e a 6 6cm ( meas ured di ag on ally)(28”) : V iewable are a 6 6cm ( meas ured di agon all

1.0kV

-1. 5kV

13 cm ×6.5cm , Ova l type×2

21 -p in E ur o c onnector (SCART s o cket)×3

Vide o : Vp-p 75Ω(RC A pin jack)

Au di o (L /R ) : 50 0m Vr ms(- 4d Bs), High Im pe dance (RC A p in j ac k)

S / Vide o Y : 1Vp- p P OSITI VE ( N eg ative sy nc Pr ovide d, when termi nat ed wit h 75Ω)

C : 0 .3V p-p ( B urst si gn al, wh en terminat ed with 75Ω)

178W (Max) 125W ( Av g)

32”) : 85. 5cm×55.0cm× 56 .8cmDimensions ( W××××H××××D )

(28”) : 78. 0cm×50.9cm×49 .9cm

Fastext (UK system) WST(world standard system)

187W (Max) 132W (Avg)

178W (Max) 125W (Avg)

AUDIO OUT (Va riable)

Headphone jack

Remote Control Unit

0～1Vrms, Low Impedance (RCA pin jack×2)

St ereo min i jac k (φ3.5mm )

RM-C54 (AAA/ R 03 dry cel l batt er y×2) R M-C 55 (AAA/R0 3 dry cell b att er y×2)

De sign & sp eci fic ations are subje ct to cha ng e wi thout notic e .

No.51994

V32X25EUS / AV32X250EU

V32X25EIGY / AV32X25EKGY

V28X25EUS / AV28X25EIGY

V28X25EKGY

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

(P-P= Peak to Peak, B-W= Blanking to white peak)

Signal Designation Matching Value EXT-1 EXT-2 EXT-3

No .

1 AUDIO R o ut put 50 0m Vr ms( N om i na l),

Low impedance

2 AUDIO R in put 500m Vr ms( Nominal),

High i m pe dance

3 AUDIO L o utput 50 0m Vr ms( N om i na l),

Low impedance

4 AUDIO G ND ○○○

5 GND (B)

6 AUDIO L input 500mVrms(Nominal),

High i m pe dance

7B input 700mV

8 FUNCTON SW

(SLOW SW)

9 GND (G)

10 SCL3 NC ○ NC

11 G in put 70 0mV

12 SDA3 NC ○ NC

13 GND (R)

14 GND (YS) ○○NC

15 R / C input R : 700mV

16 Ys i n put

17 GND(VIDEO output) ○○○

18 GND(VIDEO input) ○○○

19 VID EO outpu t 1V

20 VIDEO / Y inp ut 1V

21 COMMON G ND ○○○

Low : 0-3V, High : 8-12V, High impedance

C : 300mV

Low : 0 - 0.4, High : 1 - 3V, 75Ω○ ○

, 75Ω○○NC

B- W

, 75Ω○○NC

B- W

, 75Ω

B- W

, 75Ω

P- P

(Nega tiv e g oi n g s ync ), 75 Ω○

P- P

(Nega tiv e g oi n g s ync ), 75 Ω○ ○ ○

P- P

○

(TV OUT)

○○○

○

(TV OUT)

○○○

○

(only R)

(TV)

○

(LINE O UT)

○

(LINE O UT)

○○

○

(LINE O UT)

(only C )

[Pin assignment]

No.51994

V32X25EUS

V32X250EUS V28X25EUS

SAFETY PRECAUTIONS

1. T he des ign of th is prod uct con ta in s sp ecial har d ware , many circuit s and components specially for safety purposes. For con tinu ed pr ot ection , n o c han g es sh ou ld b e ma de to the o rig i nal d esi gn un les s a uth or i zed i n w riti n g by th e ma nu fact urer.

Replacem en t par ts must b e id ent ic al to thos e u sed in th e or i gin al ci rcu its. S ervi ce sho ul d b e p erformed by qu alif ied p ers onnel on ly.

2. Al te rati on s of t he desig n or circui tr y of t he pr oducts sh oul d not be made. Any design alterations or additions will void the manu fact ur er 's warrant y and w i ll f urth er r elieve t he ma nufac tu rer of r esp onsi b ility for perso nal inj ur y or p rop erty d amag e r esul t ing th erefr om.

3. M an y el ectrical an d m ec h ani cal parts i n th e pr od uc ts ha ve special safety-related characteristics. T hese characteristics are oft en no t e v i den t f r om vi s ua l insp ecti on nor ca n t he pr o tect ion aff or de d by them nece ssarily b e ob tai n ed by us ing rep lacem en t com po ne nts rated f or hi g he r vo l tag e, watt ag e, etc. R ep l acement p arts whic h ha v e th ese s p ecial s afet y ch ar ac t er ist ics ar e

ide ntified i n the parts li st of S ervice manua l. El ectric al

components having such features are identified by shading on t he sche mat ic s and by (!!!! ) on the parts list in Service manual. The us e of a s ub sti tu te rep lacem en t which do es n ot

h ave th e s ame saf ety ch ar act er ist ics as t he reco mmen de d replac em ent part shown in th e p ar ts list of S er v ice m an ual m ay

cause shock, fire, or other hazards .

4. Don't short between the LIVE side ground and ISOLATED

(NEUTRAL) side ground or EARTH side ground when repairing.

Some model's power circuit is partly different in the GND. The diff er enc e of th e GND is s ho wn b y th e LIV E : (") side GND , the ISO LATE D(N EUTRAL) : (#) si de GND and EARTH : ($) side GND. Do n't s h or t bet we en th e LIV E sid e GN D an d

ISO LATE D(N EUTRAL) side GND or EART H side GND an d n ever m ea sur e w it h a mea sur i ng appa r atus ( osci lloscop e etc.) th e LI VE sid e GND and IS OLA T ED(NE UTR AL ) side G ND or EARTH side GND at the s ame time. If above note will not be kep t, a fuse or any parts will b e broken.

5. If any repair has been made to the chassis, it is recommended th at t he B1 s et ting shou ld b e ch ecked or adju ste d ( Se e ADJUST M ENT OF B 1 POW E R SUPPL Y).

6. The high vol ta ge app lie d t o th e pi ctu r e tu be must con form with th at s p ec ifi ed i n S er v ice m an ual. E xcessi ve h igh voltag e can

cau s e an i ncre ase in X-Ray em i ssi on , ar c i ng an d possible component damage, therefore operation under excessive high voltage conditions should be kept to a minimum, or should be preve nt ed. If s evere arc in g occurs, remove t he AC pow er

immed i ate ly and de termine th e ca use by vis ua l insp ect ion (inc or r ect install at ion, cr ac ked or melte d high volt age har n es s, p oor so ldering, et c .) . To m ai nt ain the p rope r min imu m l e v el of sof t X- R ay emis si on, c omp on en ts in th e hi gh voltag e circui tr y incl ud i ng t he pic t ur e tu be must b e t he e xact r ep lac em e nts or

alte rn at ives ap prove d by the ma nuf act urer of th e c om pl et e prod uct.

7. Do n ot c hec k high volt ag e b y draw ing an arc. Use a high volt ag e meter or a hi g h v ol tag e pr ob e wit h a V TVM. D isc ha rg e th e picture tube before attempting meter connection, by connecting

a cl i p lead to the grou nd frame a nd c onn ecting th e oth er end of the lead through a 10kΩ 2W resi sto r to the an od e butt on .

8. W hen service is r equ ire d, ob ser ve th e or i gina l lea d dress. Ex tr a prec aut ion sh ould b e g i ven t o as sure cor r ec t l ea d dres s in th e high vol tag e ci r cuit a r ea. W here a s hor t c ircui t h as occu rre d, th ose co mponent s tha t indic a te evi de nc e of ove r hea ting sho uld

b e r e pl aced. A l wa ys us e th e ma nuf act ur er 's r ep lac em en t components.

9. Isolation Check

(1) Di electric Strength Test

(2) Leakage Current Check

AV32X25EUS / AV32X250EUS / AV28X25EUS

(Safety for Electrical Shock Hazard)

Af ter r e- as s embling th e p r odu c t, alw ays per f orm an is olat io n ch ec k on the ex po sed me tal p ar ts of t he c abin et ( a nte nn a

ter m ina ls, video /au dio inpu t and ou tput t erminals, C on trol kn obs, metal cabin et, s crewhe ad s, ea r ph one j ac k, contr ol shaf ts , etc.) to be s u re the p r odu c t i s s af e t o o pe r ate with ou t d an ger of elect rical shoc k.

The i so l ati on be tween the AC pr im a ry ci rcu i t an d all metal p ar ts exp osed t o th e us er, p arti c ularly an y expos ed met al p art having a retu rn p ath to t he chass is s ho ul d withs tan d a vol t age of 3 000 V AC (r.m.s.) for a period of one second.

(. . . . W it hstan d a vo lt ag e of 110 0V A C (r.m. s .) to an ap plianc e

rate d up to 12 0V , an d 3 00 0V AC ( r .m. s.) to an ap pl i an c e rat ed 200V or more, for a period of one second.) This meth od of test requires a t est equipment n ot g enerally found in t he s er vic e trade.

Plug th e AC l in e c ord d irect ly into th e AC ou tlet (do n ot use a line isol ati o n transf ormer du ring this ch eck.) . U s in g a " Lea kag e

Curr ent Teste r", me asure th e lea kage cu rre nt f rom each exp osed metal p ar t of the c a bi ne t, p art icularly any expos ed me tal part h avi ng a re turn pa th to t he c h assis , t o a k n ow n go od ea rt h grou nd (wa ter pi p e, e tc.) . An y l eaka ge curren t m ust n ot e xc eed

0.5mA AC (r.m.s.). Howev e r, i n tropic al ar ea , th is mus t no t exc e ed 0.2 mA AC (r.m.s.).

"""" Altern at e Che ck M ethod

Plug th e AC l in e c ord d irect ly into th e AC ou tlet (do n ot use a line isol ati o n transformer during t his c he ck.). Use an AC v o lt me ter

h avi ng 1 000 oh ms pe r volt or m or e sens it i vity i n th e fo llowi ng mann er . C on nec t a 1 500Ω 10W res ist or par a lle le d b y a 0 .1 5µF

AC-type c apa cit or bet ween an expo sed met al pa rt a nd a kno wn g ood e ar th gr o un d ( water pi pe , etc.). Meas ure th e AC vo lt ag e acr oss th e r es ist or with th e AC vo l tm eter . M ove th e r esis tor con nec tion to e ach ex p os e d me tal par t, p art ic ularly any exp osed

metal p ar t hav in g a r etu rn pat h to t he chass is, an d m easu re th e AC vol tag e ac ro s s the r es ist or . Now, re ver s e th e plu g in th e AC ou tl et and r e peat eac h mea suremen t. Any volt ag e me as u re d must no t e xceed 0 .7 5V AC (r .m.s.). This c orre spo nds to 0 .5mA AC (r.m.s.).

Howeve r, in tropica l area, this must not exceed 0.3V AC ( r.m.s.). This corresponds to 0.2mA AC (r.m.s.).

AC VOLTMETER (HAVING 1000 Ω/V, OR MOR E SENSIT IVITY)

0.15μF AC-T YPE

PLACE THIS PROBE

1500 Ω 10W

GOOD EARTH GROUND

ON E A C H EX PO SE D ME T AL PA RT

No.51994

SAFETY PRECAUTIONS

V32X25EIGY / AV32X25EKGY V28X25EIGY / AV28X25EKGY

AV32 X2 5EIG Y / AV32 X25EKGY AV28 X2 5EIG Y / AV28 X25EKGY

1. The d esign of thi s pro du ct c ont ai ns spe c i al hard ware and ma ny circuit s and components spe cially for saf ety pur poses. For

con tinu ed pr ot ection , n o c han g es sh ou ld b e ma de to the o rig i nal d esi gn un les s a uth or i zed i n w riti n g by th e ma nu fact urer.

Replacem en t par ts must b e id ent ic al to thos e u sed in th e or i gin al ci rcu its. S ervi ce sho ul d b e p erformed by qu alif ied p ers onnel

on ly.

2. Al te rati on s of the desig n or circ ui tr y of the pr od uc t should no t b e made. Any design alterations or additions will void the

manu fact ur er 's warrant y and w i ll f urth er r elieve t he ma nufac tu rer of r esp onsi b ility for perso nal inj ur y or p rop erty d amag e r esul t ing

th erefr om.

3. M an y electr ical a nd me cha nical p arts in the prod uct h av e spe ci al

saf ety- r el at ed charact erist ic s. Thes e ch aracter istic s are oft en not evi d ent fr om visu al insp ecti o n no r c an th e pr otect ion af for de d by

th em n ecess ar y b e o bta in ed by using r e plac em ent c omponen ts rate d for hi gh er v ol ta ge, watta ge, etc . R e pl acemen t p arts wh ic h

WARNING

h ave th ese spe ci al saf et y c harac teris tic s ar e i d ent if ied in th e Pa rts Lis t of S ervi ce Manu al. El ectr ical compon en ts having suc h

fe atur es are i de nti fied by shad in g on the sche ma tic s a nd by (!) on t he P arts Lis t i n the S ervi ce Man ual . T he use of a sub stitut e

replac em ent whic h d oes no t hav e th e s am e saf ety ch ar ac ter i sti cs as the r e c om mend ed r epl ace m ent p art sho wn i n

th e Par ts Li st of Se rvice M an ual m ay cau se shock , fire, or ot her hazards.

4. The lea ds in th e p r odu cts ar e r ou ted an d d res sed with t i es,

cl am ps, tu bi ng ’s , b ar ri e rs and t he like t o be s epa ra ted fr om live p arts, high t em pe ra tur e pa rts, m oving par ts and / or sh ar p ed ge s

for t he p reven tion of e l ectr i c sh oc k and fire h azard. W he n ser vice i s requ ired , the or igin al le ad r outi n g and dre ss s h ou ld b e ob ser v ed , and it should b e co nfirmed t hat th ey h ave b ee n

retu rn ed to no rmal , aft er re- asse mb li n g.

1. The eq ui pm e nt has b een d esigned a nd manu fact ured to me et i nternati o nal saf ety stand ar ds.

2. It is t he l eg al r esp onsib ility o f th e re pa irer t o ensure th at thes e s afet y sta nd ar ds are m aint ai ne d.

3. Rep ai rs mu st b e m ad e in acc ordan ce with th e rel e vant saf ety st an dards .

4. It is essen tial t hat saf ety critical c ompon ents ar e replac ed by a pp ro v ed pa rt s.

5. If main s vol t age s elec tor i s p r ovide d, ch eck s etti n g for loca l voltag e.

No.51994

V32X25EUS / AV32X250EUS

V32X25EIGY / AV32X25EKGY V28X25EUS / AV28X25EIGY V28X25EKGY

FEATURES

New c hass i s d esi gn ena ble us e of an interac tive on s creen

control.

The TELETEXT SYSTEM has a built-in FASTEXT (UK system),

TOP (German syst em) and WST (world standard system) system.

Be caus e th is T V unit corr es p on ds t o multiple x br oa dc a st, u ser s

can enjoy music programs and sporting events with live realism.

In ad di tion , BI LINGUAL pr o gr am s can b e h ear d in th eir original language.

Users can make VCR dubbing of picture and sound by controlling

th e AV se l ec to r t o s el ect a n opt ional s our ce at the E XT-2 ou tpu t

sh own i n fi gu re.

MAIN DIFFERENCE LIST

TV EXT-1 EXT-3

EXT-2

EXT-4

Model Name

Part Name

MAIN PW B ASSY SMF-1 40 4A-U2 SMF-1944A-U 2 SMF -1403A-U 2 SMF-194 3A- U2

POWE R & DEF PW B AS SY SM F-240 4A- U2 SMF-2403A-U 2

CRT SOCKE T PWB AS SY SMF-3404A-U 2 SM F-3 40 3A- U2

FRONT CONTROL PWB ASSY

SIDE CONTROL PWB AS SY SMF-8104A-U 2 SM F-8 10 3A- U2

ITC T U BE W76 ER F042 X04 4 W66 QD E993 X925

DEGA US SING COI L QQW 0066 -0 01 QQW 0100 -0 01

ROTATIO N CO IL QQW 0 130-001

FBT QQH 0127 -001 QQH0 126- 001

REAR COVE R LC1131 6- 00 1A- U LC1128 2- 00 1C - U

CUSH ION AS SY LC1137 3- 00 2A- U LC1131 8- 00 2A- U

PA CKING CASE AE M1002- 07 9-E AE M1002- A76 -E

CORNE R POST AE M3119- 00 3A- E

Model Name

Part Name

FR ON T CABINET AS SY LC1136 0- 00 4A- U LC1136 0- 00 3A- U LC1131 3- 00 4B- U LC1131 3- 00 3B- U

POWER CO RD QMPK160-185-JC QMPN130-185-JC QMPK160-185-JC QMPN130-185-JC

JVC M AR K LC4125 0- 00 2C - C LC4 1250- 001C - C LC4 1250- 002A- C LC4125 0- 00 1C - C

REMOTE CONTROL UNIT RM-C54H-1C RM-C55H-1C RM-C54H-1C RM-C55H-1C

AV32 X2 5EUS

AV32 X2 50EU S AV32 X2 5EIG Y

SMF-8404A-U2 SMF-8403A-U2

AV32 X2 5EUS

AV32 X2 50EU S

AV32 X2 5EKGY

AV32 X2 5EIG Y

AV32 X2 5EKGY

AV28 X2 5EUS

AV28 X2 5EIG Y

AV28 X2 5EUS

AV28 X2 5EKGY

AV28 X2 5EIG Y

AV28 X2 5EKGY

Model Name

Part Name

INST BOOK

RATING LABEL

EURO LABEL

WARNING LABEL

AV32X25EU S AV32X250EUS AV32X25EIGY AV32X25EKGY AV 28X25EU S AV28X25EIGY AV28X25EKGY

LC T1184- 00 1A-U LC T1185- 00 1A-U LC T1186- 00 1A-U

LC1 141 4-00 3A- U LC1 137 2- 004A -U LC1136 4- 00 8A-U LC1136 4- 00 7A- U LC1 141 4- 00 4A-U LC1136 4- 01 0A-U LC1136 4- 00 9A- U

AEM1064-017-U AEM1064-020-U AEM1064-019-U AEM1064-018-U AEM1064-021-U AEM1064-023-U AEM1064-022-U

LC3 078 9-00 2B- U LC3 078 9-00 2B- U

LC T1185- 00 1A-U LCT11 87- 00 1A-U

LC T1184- 00 1A-U LC T1185- 00 1A-U LC T1186- 00 1A-U

LC T1187- 00 1A-U

No.51994

FUNCTIONS

(FRONT) (SIDE)

V32X25EUS / AV32X250EU

V32X25EIGY / AV32X25EKGY

V28X25EUS / AV28X25EIGY

V28X25EKGY

1 2

① R em ote co ntrol se nsor ② Power lamp ③ Main power butt on

∨/∧

⑤ P

buttons / -/+ bu ttons

⑥ (Volu me ) but ton ⑦ EXT-4 terminal

④ Headphone jack (mini jac k)

(REAR PANEL) (REMOTE CO NT ROL UNIT)

① EXT-1(IN/OUT) Terminal ② EXT-2(IN/OUT) Terminal ③

EXT-3(IN/OUT) Terminal

④

Aerial Sock et

⑤

Au di o out put t erm ina l

① Mu ting K ey ② Number Key ③

ZOOM Key

④

Hyper Sound Key

⑤

Information Key

⑥ TV Key

⑧ St and by (p ower) Key ⑨ Colour Key ⑩

TEXT Key

⑪

K/MENU Key

⑫

PR Channel ∨/∧Key

⑬

FUNCTION ( / / P∧/ P∨) Key

+ -

⑦ Volume -/+ Key

No. 51994

V32X25EUS / AV32X250EUS

V32X25EIGY / AV32X25EKGY V28X25EUS / AV28X25EIGY V28X25EKGY

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unp lu g t he po we r c ord.

2. Remove the 13 screws marked A as s hown i n t he F i g. 1.

3. W i thdr a w t he rear cover towa rd you .

REMOVING THE SIDE CONTROL JACK ASSEMBLY

After removing the rear cover.

1. Remove the screw marked B as shown in the Fi g.1 .

2. W hile s l ight l y r ai s e th e side c ontr o l jack asse mb ly, r em ov e th e 2

claws under the side control jack assembly.

3. Disc onn ect th e c onn ecto r “SR ”, “ SL”, “ S”, “F” and “CN01 6” as

shown in Fig 2.

REMOVING THE SIDE CONT ROL PWB

Af ter remov i ng th e re ar cov er an d sid e co ntr ol j ac k ass embly.

1. Remove th e 3 claws C from b ack side of the side control jack

asse mb l y as s hown in Fi g. 2.

2. Pu ll out the SI DE C ON T RO L PW B.

REMOVING THE CHASSIS

" After removing the rear cover.

1. Slight l y r ai se th e bo th si de s of th e c hassis by h and and re mo v e th e tw o c laws u nd er the b oth sid es of the chass is from t he fr o nt

cab inet .

2. W i thdr a w t he chass is back w a rd .

(If n ecessary, take off the wire clamp, connecto rs etc.)

REMOVING THE POWER & DEF. PWB

After removing the CHASSIS.

1. Remove the 3 sc r ews m arked D a s sh own in the Fig.1 .

2. Remove the PO W ER & D EF. PW B upper . (If n ecess ary, ta ke o ff the wire c lamp, co nnectors, etc.)

REMOVING THE SPEAKER

" After removing the rear cover.

1. R em ove t he 2 scr ew s marked E, and rem ove the sp eake r hold er as s hown in F i g. 1.

NOTE : When rem oving th e scr ew s marked E of t he sp eaker ho lder

remove t he lower si de s cr ew fir s t, an d t hen r em ov e the

up per one .

2. Remove the 2 screws F a tta ching th e sp ea ker.

3. Follow th e s ame st eps wh en r em oving th e oth er ha nd spe aker.

REMOVING THE AV TERMINAL BOARD

After removing the rear cover.

1. R em ove th e 3 scr ew s marked G as show n i n t he F ig . 1 .

2. Remove the 2 claws marked H under the CHASSIS as shown in Fig. 3.

3. Remove the AV TERMINAL BOARD slightly in the directio n of arrow I as shown in Fi g. 3.

CHECKIN G THE PW BOARD

To c h eck the b ack side of th e PW Boar d.

1) Pull out the chassis. (R efer to REMOVING THE CHASSIS).

2) Erect t he c hassis vertically so that you c an easily check the

b ack side of th e PW Boar d.

[CAUTION]

When erecting the chassis, be caref ul s o that there will be no

con tact ing with ot her PW Boar d.

Be fore tur n in g on pow er , ma k e sur e tha t the wire co nn ecto r i s

prop er ly c on nec ted .

W hen condu cting a check with p ow er supplied , be sur e to c onfi r m

th at t he CRT E ARTH W I RE (BRAID ED AS S’Y) i s co nne cted t o

th e C R T SOC KE T PW b oar d.

WIRE CLAMPIN G AND CABLE T YING

1. Be sure t o clamp th e wire.

2. N ever rem ove th e c able tie use d f or ty i ng th e wires to ge the r.

Sh oul d it be i n adve rt ent ly remove d, b e sure to ti e th e wir es wit h a n ew c able ti e.

Connector

CN0 16

SI DE C ONT RO L

PWB

(Back view)

Fig . 2

No.51994

AV TERMINAL BOARD

Fig . 3

AV SW PWB

FRONT CABINET

(

)

(×3)

(×2)

(

)

SP EAKER HOLDER

V32X25EUS / AV32X250EU

V32X25EIGY / AV32X25EKGY

V28X25EUS / AV28X25EIGY

V28X25EKGY

Fig.2

SI DE C ONTR OL JACK ASSEMBLY

D (×3)

CRT SOCKET

PWB

FRONT C ONT RO L

PWB

C ONT RO L BAS E

MICOM PWB

CLAW

MAI N

PWB AV SW PWB

POWER & DEF. PWB

SI DE SP EAKER

CLAW

10 0Hz PWB

CHAS SIS

AV TERMINAL BOARD

POWER CORD

REAR COVER

Fig . 1

No.51994

Thi s expl o de d vi ew d escr i bes a bo ut 32”

models. Alth ou gh 2 8” m ode ls ar e sli gh tly di ffe r ent

fr om th is f igur e, you can use the exp lod ed vi ew f or di sass emb l ing t he 28 ” mod els in

same step as 32” models.

V32X25EUS / AV32X250EUS

V32X25EIGY / AV32X25EKGY V28X25EUS / AV28X25EIGY V28X25EKGY

REMOVING THE CRT

∗

Replacem en t of the CR T sho ul d be p erformed b y 2 or m or e

p ers ons.

• After removing the cover, chassis etc.,

1. Putti ng the C R T c hange table on sof t cl oth , th e CRT c ha ng e tabl e sh ould al so b e c overe d with s uch soft c lot h ( sho wn in Fi g. 8).

2. W hile kee pin g th e s urf ac e of C RT down , m ou nt the TV s et on t he CRT change table balanced will as shown in Fig.9.

3. R em ove 4 sc re ws mar ked by arr o ws wi th a box typ e scr ew d ri ve r as s hown in Fig. 9.

• Si nc e th e cab i net wi ll dr op w he n s crews h ave be en r em ove d, b e

sure t o su pp ort t he cab inet with h ands.

4. After 4 screws have been removed, put the cabinet slowly on cloth (At this ti me, be carefully so as not to damage th e front

sur fac e of th e c abin et) sh own in Fig. 10.

• T he CR T sh oul d b e ass embled acc or di n g to th e o pp os i te sequence of its dismounting steps.

∗

The C RT chang e t able sh ould pr ef erab l y b e small er t hat th e CRT

sur fac e, and i ts h ei gh t b e abo ut 35c m.

CRT CHAN GE TABLE

AP PROX. 35 cm

CLOTH

Fig. 8

CRT

CRT CHA NGE TABLE

BOX TYPE

SCREW DRI VER

CABINET

Fig. 9

CRT

CRT CHANGE TA BLE

Fig. 10

No. 51994

+ 22 hidden pages

JVC AV28X25EIGY, AV28X25EKGY, AV28X25EUS, AV32X250EUS, AV32X25EIGY Service Manual

CONTENTS

SPECIFICATIONS

SAFETY PRECAUTIONS

SAFETY PRECAUTIONS

WARNING

FEATURES

MAIN DIFFERENCE LIST

FUNCTIONS

SPECIFIC SERVICE INSTRUCTIONS