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VIORE
SERVICE MANUAL
Model: LCT37V66HM
1. Safety Instructions...............................................................................1~2
2. Trouble Shooting manual of LCD.............................................................3~4
3. Product Specification............................................................................5~7
4. Block Diagram...................................................................................8
5. Circuit diagram..................................................................................9~16
6. Basic Operation & Circuit Description......................................................17~19
7. Main IC Information...........................................................................20~38
8. Panel Information..............................................................................39~65
9. Exploded View.................................................................................66
10. Spare Part List..................................................................................67~69
11. Software Upgrade..............................................................................70~72
This manual is the latest at the time of printing, and does not
include the modification which may be made after the printing,
by the constant improvement of product.
I. Safety Instructions
The l ig h tn i ng fla sh w i th arro wh e ad symb ol ,
within an equilatera l triangle, is intended to alert
CAUTION the user to the presence of uninsulated " dangerous
voltage" within the prod uct' s enclosure that may
RISK O F ELECT RIC SHO CK be of sufficie nt mag nitud e to consti tute a risk of
DO NO T O PEN electric shock to persons.
The excla mati on po i nt wi thi n a n e q ui l ate ra l
CAUTION: TO REDUCE THE RISK OF ELECTRIC tri a n gl e is i nte n de d to a le rt th e u se r to th e
SHOCK, DO NOT REMOVE COVER (OR BACK). NO presence of important operating and maintenance
USER-SERVICEABLE PARTSINSIDE. REFER (s e rv i ci n g ) i n str u ct i o n s i n th e l i te r a tu re
SERVICING TO QUALIFIED SERVICE PERSONNEL accompanying the appliance.
ONLY.
PRECAUTIONS DURING SERVICING
SAFETY INSTRUCTION
1. In a ddition to safe ty, othe r parts and assemblies are
The se rvice shoul d not be attempted by anyone
speci fied for conformance with such regulatio ns as unfamiliar with the ne cessary i nstructio ns on th is
those applyi ng to sp urious radiation . These must
monitor. The fo llowing are the necessary
also be replace d only with specifie d replacements.
instru ctions to be ob served before se rvicing.
Exampl es: RF converters, tun er units, a ntenna 1. An isolation transformer shoul d be con nected i n the
selection switches, RF cables, noise-blo cking
power li ne between the receiver and the AC line
capacitors, noise-bl ocking filters, etc.
when a service is performed o n the primary of the
2. Use sp ecified inte rnal Wiring . Note especially: conve rter tra nsformer of the set.
1) Wires covered with PVC tubing
2. Comply wi th all caution an d safety related provided
2) Do uble insulated w ires
on th e back of the cabi net, inside the cabinet, o n the
3) Hig h voltage leads chassis or p icture tube.
3. Use specified i nsulating material s for haza rdous
3. To avo id a shock hazard, alw ays discharge the
live pa rts. Note espe cially:
pictu re tube's anode to the chassis g round be fore
1) In sulating Tape removi ng the anod e cap.
2) PVC tubing
3) Spa cers (insu lating barriers)
4) Insula ting sheets for transistors
5) Plastic screws for fixing micro switches
4. When replacing AC primary side compo nents
(tran sformers, power cords, n oise blo cking
capacitors, e tc.), wra p ends o f wires securely about
the te rminals be fore solde ring.
5. Make sure that w ires do no t contact heat generating
parts (he at sin ks, oxide me tal fi lm resistors, fusi ble
resistors, etc.)
6. Check if replace d wires do not conta ct sharply edged
or po inted pa rts.
7. Make sure that foreign objects (screws, solder
drop lets, etc.) do not remain insi de the set.
MAKE YOUR CONTRIBUTION TO PROTECT THE
ENVIRONMENT
Used batte ries wi th the ISO symbol
for recycling a s well as small
accumu lators (re chargeable batteries), mini-batteries
(cell s) and starter b atteries should not be thrown
into the garbage can.
Please leave the m at an ap propriate depot.
-2-
172
4. Completely discharge the high pote ntial voltage of the PRODUCT SAFETY NOTICE
picture tube before handli ng. The pi cture tube is a
Many e lectrical an d mechanica l parts in this monitor
vacuum and if bro ken, the gl ass will explode.
5. When rep lacing a MAIN PC B in the cabinet, always have special safety-related characteristics.
These characteri stics are offer passed unnoticed by
be certai n that all protective are installed properly
visual spection and the protecti on afforded by them
such as co ntrol knobs, adjustment co vers o r shie lds,
barri ers, iso lation resistor networks etc. cannot necessari ly be obta ined by using replacement
compon ents rates for a hig her voltag e, wattage , etc.
6. When se rvicing is re quired, observe the origin al lead
The replacemen t parts w hich have these sp ecial
dressing. Extra precau tion sho uld be gi ven to a ssure
correct lead dressing in the high voltage area. safety characteristics are identifie d by marks on
the schematic diag ram and on the parts l ist.
7. Keep wires away from high voltage or high te mpera
Before replacin g any of these compo nents, rea d the
ture compone nts.
8. Befo re returning the set to the customer, al ways parts list in thi s manua l care fully. The use of
substitute re placemen t parts which do not have the
perform an AC leaka ge current check on the exposed
same safety chara cteristics as speci fied in the p arts
meta llic parts of th e cabine t, such as anten nas,
termin als, screw heads, meta l overlay, control shafts, list may cre ate shock, fire, X-RAY RADIATION or
other h azards.
etc., to be sure the set i s safe to operate without
danger of electrica l shock. Plu g the AC lin e cord
directly to the AC outlet (do not use a line iso lation
transformer d uring th is check). Use an AC voltmeter
havin g 5K ohms volt sen sitivity or more i n the
following manner.
Conne ct a 1.5 K ohm 10 watt resistor pa ralleled by a
0.15