Service Manual TU2155SB

TU 2155 SB 

SERVICE MANUAL Ultra slim Series Shiny Black 

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2

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SAFETY PRECAUTIONS 1.

The design of this product contains special hardware, many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnel only.

2.

 lterations of the design or circuitry of the products should not be made. ny design alterations or additions will void the manufacturer!s warranty and will further relieve the manufacturer of responsibility for personal in"ury or property damage resulting therefrom.

3.

 #any electrical and mechanical parts in the products have special safety$related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the parts list of Service manual. Electrical compoets !a"i# s$c! %eat$res are i&eti%ie& '( s!a&i# o t!e sc!ematics a& '( ) * o t!e parts list i Ser"ice ma$al.  The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement part shown in the parts list of Service manual may cause shoc%, fire, or other hazards

+.

,o-t s!ort 'etee t!e LIVE si&e #ro$& a& ISOLATE, )NEUTRAL* si&e #ro$& or EART/ si&e #ro$& !e repairi#. Some model!s power circuit is partly different in the &'(. The difference of the &'( is shown by the )*+-  / side &'(, *S0)T( 'TR)/ -  / side &'( and RT2 -  / side &'(. (on!t short between the )*+ side &'( and *S0)T( 'TR)/ side &'( or RT2 side &'( and never measure with a measuring apparatus oscilloscope etc./ the )*+ side &'( and *S0)T( 'TR)/ side &'( or RT2 side &'( at the same time. *f above note will not be %ept, a fuse or any parts will be bro%en.

3.

*f any repai r h as been m ade to the chas sis , i t i s recommended that the 41 setting should be chec%ed or ad"usted See (5ST#'T 0F 41 607R S66)8/.

9.

The high voltage applied to the picture tube must conform with that specified in Service manual. :cessive high voltage can cause an increase in ;$Ray emission, arcing and possible component damage, therefore operation under e:cessive high voltage conditions should be %ept to a minimum, or should be prevented. *f severe arcing occurs, remove the < power immediately and determine the cause by visual inspection incorrect installation, crac%ed or melted high voltage harness, poor soldering, etc./. To maintain the proper minimum level of soft ;$Ray emission, components in the high voltage circuitry including the picture tube must be the e:act replacements or alternatives approved by the manufacturer of the complete product.

0.

(o not chec% high voltage by drawing an arc. se a high voltage meter or a high voltage probe with a +T+#. (ischarge the picture tube before attempting meter connection, by connecting a clip lead to the ground frame and connecting the other end of the lead through a 1=% Ω >7 resitor to the anode button.

1.

7hen service is required, observe the original lead dress. :tra precaution should be given to assure correct lead dress in the high voltage circuit area. 7 here a short circuit

has occurred, those components that indicate evidence of overheating should be replaced. lways use the

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manufacturer!s replacement components. 4. Isolatio C!ec5 )Sa%et( %or Electrical S!oc5 /a6ar&*  fter re$assembling the product, always perform an isolation chec% on the e:posed metal parts of the cabinet antenna terminals, video?audio input and output terminals,

1>

*F input 1

*F *'1

1@

*F input >

+(R

1E

+ertical drive  output

+(R4

13

+ertical drive 4 output

 +)?7

19

utomatic volume leveling ?ST$7ST drive output

(3

crystal oscillator input

*R

>9

Remote control signal input.

#T

>D

Sound mute output

T*)T?2F

>I

V8

>N



tuning +oltage +t/ 67# output

+((6

@@

Supply to periphery$@.@+/

S(

@E

*> mode

06T programming +oltage

+((

E@

Supply voltage@.@+/

40T

EE

4lue output

&0T

E3

&reen output

R0T

E9

Red output

4)V*'

ED

blac% current input ? +$guard input +

4

9>

+> +*(0 *'

 *'>?1*')

9@

) (*0 *'

> is pin 1 to 1>.

LA342A:100:LA014+:LA014+4 S(m'ol

PIN

Function - "ertical o$tp$t

F$ctio

S(m'ol

PIN

F$ctio

INV IN



Ip$t

V OUT

<

Vertical o$tp$t

VCC

2

Poer

VCC2

?

O$tp$t poer s$ppl(

PUMP UP

3

P$mp $p poer

NON INV IN

0

Ne#ati"e %ee&'ac5

9N,

+

9ro$&

Test poit 8a"e%orms  

2.?Vpp

 

.2Vpp

 

3.1Vpp

 

2.