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Contents
t . Technical speciÍications 2. Connectionfacilitiesand Chassis overview 3 . SaÍety instructionsfor repairs,
Maintenanceinstructions, Wamingsand Notes Mechanicalinstructions Block diagram Testooint overview Wiringdiagram Service Modes, DST, Error messages, Protections,Faultfindingand Repair tips Electrical diagrams and PWB-layouts Supply voltage diagram (SchémaA1) Powersupply21" " (SchémaA1) Powersupply> 21 (SchémaA2) Horizontaloutput (SchémaA3) Vertical output (SchémaAa) Audio ampliÍier (Schéma81) Tuner + lF (Schéma 82) Video processing
Page
2 2
Contents
Electrical diagrams and PWB-layouts (Schéma BB) Synchronisation (Schéma84) lF sound (Schéma85) EuroconnectoÍ1 (Schéma 86) 2 Euroconneetor (Schéma87) Controls Connectionsaudio (Schema BB) module (Schéma 89) Teletext (SchemaC) CRT panel (Schéma01) Audio module (Schéma D2) Nicam L module CTI/BlackStretch panel (SchémÊ D (SchemaG) N/S oanel Mains/RCS/LED Panel (Schémal) J) Control and Inpuvoutput (Schéma 8. Electricalalignments Íor 10. Directions use 11. List oÍ abbreviations 12. Spare parts lists
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Diagram 21 21 22 22 23 24 24 25 26 27 28 29 30 31 32 34 37 39 PWB 18 18 18 18 18 18 18 25 27 27 29 29 30 31
4. 5.
3 4 6 7 8 8 Diagram PWB 12 14 13 14 15 14 16 14 17 14 17 18 19 18 20
6. 7.
Copyright 1996 Philips Consumer ElectÍonicsB.V. Eindhoven,The All Neitíerl-ands. rights reserved. No part of this Publicationmay be reoroduced,storedjn a retrievalsysteni or transmitted,in any form or by ariv means, electronic,mechanicá|,photocopying,or otherwisewithout of thé prior permission Philips. oCopyright to reserved Subiect modification published SM9671TV Service in DepartmentPrinted TheNetherlands by PCS 82 264 GB
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1. Technical speciÍications
Mainsvoltage Powerconsumption outputpower(Vvatt) nominal peakoutputpowerWatt) standby Watt) Mains frequency range colour synchronisation Pull-in horizontal Pull-in range synchronisation
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: > + 600H2
overview facilities and Chassis 2. Connection
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Front+ Top control + Side l/O
Front + Side control + Side l/O
of Specification the terminalsockets
REAR EXTI - CVBS(in/cut)+ RGB(in)tuner at output EXT2 - CVBS(in/out)+ SVHS(in) - Input: EXTzthen output = tuneri input: other then outPut= inPut 1 2 3 4 5 6 7 8 Audio OR(o.SVnrus10ko) AudioGL(o.SVnus<1ko) Audio I Audio L(0.2-2Vnr'rs>10ko) Cinch- audioout O ctucx AudioL (red) I (0.5Vnr',ls1kA) < O ctNcH AudioR (whire) O (0.5Vnus 1kA) <
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EXT1/75o) CVBS I CVBS JCVBSo(1Vpp/75O) cvBS(1vpp/75o) Earth screen
FRONT Audiofuideoin O crncn cvBSO (1vpp/75o) O ctrucn AudioL (red) O (2Vnr',rs10kO) > O ctttcH AudioR (white) O (2Vaus 1OkO) > Headphone I qn 8-600ei
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66532068_001.41
instructions, Íor 3. Safetyinstructions repairs,Maintenance Warnings and Notes
SaÍetyinstructions Íor repairs
1.
Safetyregulations requiÍe during repair: that a - the setshouldbe connected the mains an isolating via to transformer: - saÍetycomponents, indicated the symbol a by identical the to shouldbe replaced components by original ones; - whenreplacing CRT,safetygoggles mustbe worn. the require aftera Íepairthe set must Safetyregulations that 'rts be Íeturned in original In attention condition. particular points: shouldbe paidto theÍollowing - As a strictprecaution, advise to resolder you the we jointsthrough solder whichthe horizontal deÍlection is current flowing, particulaÍ: in o all pinsoÍ the lineoutputtransformer (LOT); o fly-backcapacitor(s); . S-@rrectioncapacitor(s); o lineoutput transistor; . pinsof the connector wiresto the deÍlection with coil; o othercomponents which deÍlection the through current Ílows.
Note: This resolderingis advised to prevent bad connectionsdue to metal Íatigue in solder joints and is thereÍore only necessary Íor television sets older than 2 years. - The wire trees and EHT cable should be routed correctly and Íixed with the mounted cable clamps. - The insulationoÍ the mains lead should be checkedlor external damage. - The mains lead strain relieÍ should be checked for its tunction in order to avoid touching the GRT, hot componentsor heat sinks. - The electricalDC resistancebetween the mains plug and the secondary side should be checked (only for sets which have a mains isolated power supply). This check can be done as Íollows: o unplug the mains cord and connect a wire between the two pins oÍ the mains plug; e set the mains switch to the on position (keep the mainscord unplugged!); . measuÍe the resistancevalue between the pins oÍ the mains plug and the metal shieldingoÍ the tuner oÍ the aerial connectionon the set. The reading should be between4.5 MO and 12 MO; o switch off the TV and remove the wire between the two pinsoÍ the mains plug. - The cabinet should be checked Íor defects to avoid touching oÍ any inner paÍts by the customer.
2.
Maintenance instructions
to inspection It is recommended have a maintenance The interval carriedout by a qualiÍied seÍviceemployee. dependson the usage conditions: r when the set is used undernormalcircumstances, Íor examplein a livingroom,the recommended interval is 3 to 5 years; r when the set is used in circurnstances higher with levels,for exanrple a dust,grease or moisture in kitchen,the recommendedinterval is 1 year. The maintenanceinspectioncontainsthe Íollowing actions: "generalrepair . executethe abovementioned instruction"; . cleanthe power supplyand deflection on circuitry the chassis; . cleanthe picturetube paneland the neck oÍ the pictuÍetube.
Notes
1.
The diÍect voltages and oscillogramsshould be measured with regardto the tuner earth (J), or hot earth (I{) as tnis is called. The direct voltages and oscillogramsshown in the diagramsshould be measured in the Service DeÍault Mode (see chapter 8) with a colour bar signal and stereo sound (L:3 kHz, R:1 kHz unless stated otherwise)and picture carrier at 475.25 MHz. WheÍe necessary,the oscillogramsand direct voltages are measuredwith (''ll-)and without aerial signal ([). Voltages in the power supply section are measuredboth Íor normal operation (@) and in standby (O). These values are indicatedby means of the appropriatesymbols. The picturetube PWB has printed spark gaps. Each spark gap is connected between an electrodeoÍ the picturetube and the Aquadag coating. The semiconductorsindicatedin the circuitdiagram and in per the parts lists are completely interchangeable positionwith the semiconductorsin the unit, inespectiveoÍ the type indication these semiconductors. on
2.
3.
4.
Warnings
1. In order to preventdamageto lcs and transistors, all high-voltageflashovers must be ave,ided.In order 1o prevent damage to the picturetube, the method shon'n in Fig. 3.1 shouldbe used to discharge picturetube. the probeand a multimeter(position DC-V) Use a high-voltage Dischargeuntil the meteÍ readingis 0V (afier approx. 30s).
5.
2.
l ESD IÈs.
All lCs and nrarryother semiconductorsare sensitiveto electrostatic discharges(ESD).Carelesshandling during repair can drasticallyshortenthe liÍe. Make sure that during repair you are connected by a pulse band with resistanceto the same potential as the earth ot the unit. Keep components and toolsalso at this same potential
3.
Together with the deÍlectionunit ancjany multipoieunil, the flat square picture tubes used forrn an integratedunit. The deÍlection and the multipole unitsaíe set opiimallyai the Íactory. Adiustmeni of this unit during repair is thereÍore not recommended. Be carefulwhen taking measurements the high-voltage in sectionand on the picturetube. Never replacemocjules otheÍ components whilethe unit or is switched on. When making settings, use plastic ratheÍ than metal tools. This will prevent any short circuiis and tire ciangeioÍ a circuitbecomingunstable.
Figure3.1
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P R O o L O G I C ManuÍacturedunder license from Dolbv Laboratories l-icensingCorporation. DOLB'/,the double-DsymbolD! and PRO LOGICare trademarksoÍ Dolby LaboratoriesLicensingCorporation.
4. 5. 6.
PCS 82 266 GB
4. Mechanical instructions
The MD1 chassis two different .2E has mechanical executions.
Servicepositions
Small Signal Panel (SSP) component side (Figure4.1) 1. Push down the clicks oÍ the SSP bracket (1) and shift the SSP to the lefi. 2. Pull up the SSP and tilt the SSP counter clockwiseto a position(180'with LargeSignalPanel horizontal 3. Put the SSP in the clicks (2) marked "Sewice" on the bottom plate. When all cables on the SSP are disconnected,the SSP can also be removed from its bracket (Figure 4.2), providing better access to component and copper side.
4.1
Stylingwith top controland side inpuVoutput (alsoapplicable MD1.1E Íor Widescreen)
Removing the Íear cover 1. First all screws on the rear cover have to be removed. . 4 Screws are located at each corner of the cabinet. . 2 Screws are located at the left and right bottom corners oÍ the rear cover. . 4 Screws are Íixed at the 4 corners oÍ the l/O panel with the Euroconnectorsand aerial input. 2. The rear cover is now held in position by 6 clicks between the cabinet and the rear cover. There are 2 clicks at the left, 2 at the right and 2 at the top. After looseningall clicks (by releasingthem with a screwdriver),the rear cover can be removed. 3. The cover plate on the l/O panel with the EuroconnectoÍs and aerial input can be removed in the following way: remove the screw in the middle, release the click connectionat the bottom and lift the cover plate.
(LsP)).
Processposition
The process position provides easier access to the entire chassis. 1. Releasethe mains cord Írom its Íixation brackets. 2. Push back the clicks between bottom plate and rear cover and pull the cabinet at the same time backwards. For some service positions cables may have to be removed from their cable clamps and channets. AÍterwards, put the cables back in their original position.
bracket
Click (1) Figure 4.1
_014.41 071096
PCS 82 267 GB
LSP component side (Figure 4.3) 1. Put the SSP in the horizontalservice position as described above. 2. Remove screw (3) from the LOT bracket. 3. Remove the bracket by releasingclick (4) and pulling the bracket upwards. 4. Release clicks (5) and (6). 5. Lift the LSP PWB out of its bracket (indicatedby the arrow) and pull it a little back. Warning! The heat sinks arc not connected to ground.
Clip(6)
LSP copper side x/ith table/workbencá (Figure 4.4) 1. Disconnectthe cable to the degaussingcoil (yellow connector L02 on LSP). 2. lÍ necessary, disconnectthe cable on the left loudspeaker. 3. Lift the LSP Írom its bracket as described above (LSp component side). 4. Turn the LSP undemeath the CRT panel (keep cable 515/L15 UNDER the audio module)as indicated the by arrow (7). The LSP now rests on the bottom plate, held in place by the cable clamp on the heat sink and the LOT bracket. Warning! Be careful not to damage the CRT-panel or picture tube neck. The heat sinks are not connected to ground.
Click (4) Figure 4.3
c166532052_01 5.Al 110996
SSP and LSP copper si]de without tabte/workbench (Figure 4.5) For this seruice position MDl cable extension kit (service code number 4822 320 11695) is required. 1. Break the service pin (markedM't - see Figure 4.3) from its position at the right hand side oÍ the bottom ptate. 2. Disconneqtthe cable to the degaussingcoil (yellow connector L02 on LSP) and the cable on the left loudspeaker. 3. Removecables510/L10,51 1/L1 and 515/L1 Írom 1 5 LSP to SSP and cable l28lL28 Írom Audio module to LSp. 4. Lift the LSP lrom its bracket as described earlier (LSP component side). 5. Put the LSP to the vertical position (Figure 4.5), copper side at the right hand, LOT above (8). For this position, special grooves are made in the bottom plate of the cabinet. 6. Fix the position oÍ the LSP by putting the service pin between LSP (heat sink) and bottom ptate (9). There are special holes in the heat sink and the bottom plate to put the service pin in. 7. Reconnectcable128/128. 8. Use the cables Írom the MD1 cable extension kit to reconnect connectors S10/L10, S11/L1 1 and 51 S/Li S. Warning! All cables should be reconnected correctly.
Figure4.4
After use the service pin can be placed in the spare hole at the right hand side in the bottom plate.
665320s2017.41
Figure 4.5
instructions Mechanical
Accessingthe modulewith mainsswitch, LEDand RC5 receiver(Fig.4.6) coil 1. Cutthe tie rapof the degaussing at the lefthand coil bottom side (10).Remove degaussing in the left the (1 ÍromitsÍixation bracket 1)to get more bottom corner spaceto handle mainsmodule. the pànelbracket lifting end by the 2. Remove redmains the (12). andpulling backwards it space, lefttop of the cabinet the 3. To get moremovement (13). or upwards can be pushed pulled 4. The mainspanelcannowbe removed. at the be Afterwards degaussing should retied position coil (10).
( 10) ( 11 ) (12)
4.2
Styling with side control and side inpuVoutput (no top control) ttre Removing rear cover 1. Firstall screws the rearcoverhaveto be removed. on . 6 Screws located thecomers the cabinet. oÍ are at . 2 Screws located the leftand rightbottom oÍ at aÍe the rearcover. . 3 Screws located above, just underandleftoÍ the are coverplateof the UOconnections. Fot someservicepositions cablesmayhaveto be removed put Aftenttards, the íromtheircableclampsand channels. position. cablesbackin theiroriginal Process position position provides access the entire to easier The process posltions. during service the chassis pulled (t Íorward Scm) and 1. Thechassis be lifted, can plate. fixedin the bottom platerearcoverare 2. Whenthe clicksbetween bottom platecanbe pushed back,the chassis the bottom and pulled backwards. Servicepositions SSPcopperand component side, moduleservicing (Figure4.7) '1 Release clickconstruction between SSPand (14) . the the LSP. 2. Liftthe SSPa littleandturn it to an angleoÍ 135' (15)or 180"(16) ÍromtheLSP. Thisprovides to sideoÍ the better access the clmponent oÍ for SSPandalsoallows the removal modules. (Fig.4.8) Serviceposition with table/workbench 1. Disconnect cable the degaussing (yellow coil the to connector on the LSP). L02 plateandpullit 2. Lifithe chassis fromthe bottom (17). backwards around CRTpanel(18). the 3. Turnthe entirechassis Thechassis restson the SSPwiththe copper sideof the LSPbackwards. Warnlng! Be carefulnot to damagethe CRT-panel or picturetubeneck. to Theheat sinksare not connected ground. FiguÍe4.8
66532052_01 8.Al 071096
Figure4.6
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Figure4.7
Service position (LSP copper side) without table/ workbench (Fig.4.9) 1. Disconnect cableto the degaussing the coil (yellow connector L02 on the LSP). 2. Lift the chassisÍrom the bottom plate and turn it counter clockwise (19). 3. The SSP can be Íixed with a screwdriverto the bottom plate (20). The copper side ofthe LSP can now be accessed. Waming! Be careful notto damage the CRT-panel or picture tube neck. The heat sinks are not cannected to ground.
Small Signal Panel (Fig.4.2) First, remove all cables connectedto the Small Signal Panel.The SSP can be removed by sliding it out of the SSP bracket (in the directionof the arrow). Large Signal Panel (Fig.4.10) After removingthe screw (21), and pushing back the clips (22), the LSP can be lifted out the bracket as indicatedby the arrow. Accessing the panel with mains switch, LED and RCS ÍeceiveÍ The mains module is located in the middle oÍ the set. below the picturetube. 1. Push the clicks between bottom plate and rear cover back and pull the chassis back as Íar as possible. (14 2. Releasethe clickconstÍuction - Fig.4.7) between the SSP and LSP, lift the SSP a little and turn it to an angle oÍ 180' (16 - see Fig. 4.7)lrom the LSP. The mains panel can now be accessed when reaching over the SSP/LSP. 3. Removethe 2 screws left and right on the mains panel bracket. The complete mains panel can now be removed by pullingit backwards.
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PCS 82 270
PCS 82 27
Testpointoverview TestpunktUbersicht / / Relevé des pointsde test
Stretch panel/ CTUBlaek CTI/BlackStretch Platine/ PlatineCTI/BlackStretch
CRTpanel/ CRT-Platine Platine tube cathodique /
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PCS 82 271 GB
Wiringdiagram Verdrahtungsschema / / Schéma càblage de
@r
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SMALL SIGNAL PANEL
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SIDE TOP / CONTROL
( ) CoNNECïORS USED WrrH TOPCONTROL
cL 66532052_001.41 190996
Protections, 6. ServiceModes,DST,Errormessages,
Faultfindingand Repairtips
In this chapter the following paragraphs are included: Test points 6.1 Service Modes and Dealer Service Tool (DST) 6.2 "blinking Errorcodes and LED" procedure 6.3 6.4 Protections Faultfindingand repairtips 6.5 Exiting SDM: the - Switch the set to stand-by (the error buffer is also cleared). Note: When the mains power is switched off while the set is in SDM, the set will enter to SDM immediately when the mains is switched on again'
6.1
Test points
The MD1 chassis is equipped with test points in the service printing.These test points are reÍerringto the functional blocks: Test points for the audio processing * A1-42-43, etc.: circuitry Test pointsfor the controlcircuitry * C1-C2-C3,etc.: Test pointsfor the frame driveand * F1-F2-F3, etc.: frame output circuitry Test ooints Íor the line drive and line etc.: * L1-L2-L3, output circuitry
* * *
P1-P2-P3, etc.: T1-T2-T3, etc.: V'l-V2-V3, etc.:
Testpoints the powersupply for Testpointfor the teletelc circuitry TestpointsÍor the videoprocessing circuitry
6.2
Servicemodesand DealerServiceTool (DST)
For easy installationand diagnosis the dealer remote control The RC7150can be usedfor all new RC7150is introduced. TV sets, includingall set of the MD1 chassis.The RC7150is also called Dealer Service Tool or DST. The ordering number of the DST (RC7150) is 4,22218 21232.
The SDM has the Íollowing pre-deÍinedconditionsÍor all microprocessor controlledtuning and linear functions: - For recognitionof the SDM "SER" is displayedat the top oÍ the screen. - Tuning at 475.25 MHz (Secam on Multi-Francesets (with Nicam L), PAL on other sets). - Volume level is set to 25olo the maximum volume (oÍ level). Other picture and sound settings are set to 5096. - Auto switch off disabled (normallythe set is automatically switchedoff when no video signal (IDENT)was received for 15 minutes). - Sleeptimer is disabled. - All other controls operate normally. - When the microprocessor supports the "blinking LED" procedure (See 6.3) and an error code is present in the error buífer, the LED will blink the number of times, equai to the value of the last error code. This function will also work when there is no soud or plcture. 6.2.2.2 Seruice Alignment Mode (SAM) Entering SAM: - By transmitting "ALIGN'commandwith the RC7150 the Dealer Service Tool (this works both while the set is in mode or in the SDM). normaloperation "MENU" - By pressing the and':" key on the local when the set is in SDM. keyboard simultaneously ÊxitingSAM: - Switch the set to stand-bv. Note: When the mains power is switched off while Íhe sef is in SAM, the set will entet SDM immediately when the mains is switched on again.
6.2.1 Installation Íeatures Íor the dealer can for the Thedealer usethe RC7150 programming Tv-set Tv-settings, withpresets, Dishsettings. program 10 Differenl into tablescan be programmed the DST (downloading theGFLor MD2 from viaa GFLor MD2TV-set to the DST;seeGFLor MD2service manuals) by the or g interf DST-I(DST/PC ace;orderin code4822218 2127n. Íeatures the DST,the Forexplanation the installation of of (For for directions useof the DSTare recommended the MD1 chassis, download code4 shouldbe used). 6.2.2 Diagnose features for the servicer via The MD'|.2 setscan be put in the two service modes the These theService Mode(SAM) DSTRC7150. are Alignment Default andthe Service Mode(SDM). SDMcanalsobe circuiting "seÍvice".pins the SSP. the on entered short by 6.2.2.1 ServiceDefauftMode (SDM)
Entering SDM: the - By transmittingthe "DEFAULT' command with the RC7150DealerServiceTool. - By temporarily shortingpins S42 and S43 on the Small SignalPanel.
ln the SAM the following informationis displayed on the screen: - Softwareversion (the software version oÍ the microprocessorin the set is displayed.This software version identiÍicationcorrespondswith the software versions in the Software Survey as publishedin the Product Survey. - Error code buffer (see paragraph 6.3). - Options (see paragÍaph 8.4). - Alignment and geometry information (see paragraph 8.2.1,8.3.1and 8.3.2).
Service Modes, DST,Errormessages,
(1) SoÍtware version (21 Errorbuffer (3) Options (4) Alignments geometry and
Example: Errorcodeposition Errorbuffer 1 2 3 4 5 6 7 2 4 1 0 0 0 0
c afterenteing SDM blink (2x) - pause - blink (2x) "DIAGNOSE . after transmlfÍ,íng 2 OK with the DST blink (4x) - pause - blink (4x) o after transmrftlng"DIAGNOSE3 OK' with the DST blink-pause-blink "DIAGNOSE . after transmltÍrÍng 4 OK' with the DST nothinghappens
Note! Figure 6.1 ScreenoÍ the ServiceAlignment Mode(SAM) lmportant!
Note that it may take up to 7 seconds before the set respons to a DIAGNOSE contmand. lnterruption of the blinking sequence may lead to incorrect results. Not all software versionsof the MDl.2E chassis support the blínking LED procedure and the DIAGNOSE 99 command. Software versions NOT supporting the blinking LED procedure are MlZBAx-x.x and Ml2COx-3.x.
6.3
Errorcodes and "blinking LED" procedure
Ïhe errorcodebuÍÍer contains errors all detected sincethe lasttimethe buffer waserased. bufferis written The Íromleft to right. - The lasterrordetected (actual) the errorat the leftside is - The errorbuffer be resetin theÍollowing will cases: 1. exiting SAMwiththe "standby" the command the on remote control "DIAGNOSE 9 OK with 2. transmitting commands the 9 the DST - By leaving SAMwiththe mains the switch, error the bufferis not reset. Examples: ERROR: ERROR: ERROR:
Enor code 0
EÍor desoiption
Bfinking Pgssble , . lD, deÍectvecoÍnpgnents:
Noerrordetected
BIMOS (ID48366) error
1x 2x 3x
1c7119 (SSP) 1c7353
2 000000: 3 0 0 0 0 0: 530000: Noerrorcodedetected Errorcode3 is the lastand onlydetected error ErrorcodeSfirstanderror code5 lastdetected 3
4 5
MSP3400/3410 erÍor
(ssP)
All lzC-related components
lzc buserror
Wrong EEPROM 4x
EEPROM defective
rc7685(SSP) 1c7685 (SSP)
Thecontents the erÍorbufiercanalsobe madevisible of through "blinking the LED:procedure. is especially This useful whenthereis no picture. Therearetwo methods: 1. Whenthe SDMis entered, LEDwillblink number the the oÍ times,equalto thevalueoÍ the/asÍerrorcode. The LEDwill stayoff briefly blinkagainthe number and oÍ times,equalto the valueto the /asterrorcode 2. Withthe DSTa//errorcodesin the errorbuffer be can made visible. While SDM. in transmit command: the "DIAGNOSEx Ol( wherexis the position the in errorbuffer be madevisible to x ranges Írom 1, (thelast (actual) error)to 7 (theÍirst error)
The LED will operate in the same way as in point 1, but now Íor the error code on positionx.
5x 6x 7x 8x 9x 10x
11x
b
Tuner errol TXTerror
HistogramProc. eÍror
(ssP) u1000 (ssP) rc7702
1c7210 (Íeserved) 1c7440 (16x9 module) tc7540 (WSSB module)
7 8
9
processor 16:9 error
WSSB module error
10
11
processor Dolby erÍor
rc7600
(Audio module)
Table6.1 Error code list
Protections, FaultÍinding Repair and tips
6.4 Protections
The EasVWest protection detects whenthe current through poweroutputstagewithTS7480 too high. the Easvwest is
Note:
6.4.1 In the MD 1.2Ethe Íollowingprotections are possible: generated thepower Protections by supply:
o o o . Overload protection Undedoad Over voltage Under voltage --+ Hick up mode + Hick up mode + Hick up mode -+ Hick up mode
A cunent throughthe Easwest stage that is too high can be causedby a defective part in the line-deflectíon circuitrv!
DeÍlection: o Horizontal Protection o EW-Protection r Vertical Protection
-+ Supply to standby -+ Supply to standby -+ BIMOSstandbymode
Soítware protection -+ (ErroÍcode 1) o BIMOS lC7119 deÍective Set can be switched between standby and ON, but there is no picture,no OSD,sound is only noise. -+ (Error code 3) . SDA or SCL shorted
The current through EastArVest the stageis measured on the LSPvia2 precision resistors (R3483 R3484). and In caseoÍ a lineproblem, easvwesÈcurrent the becomes too highandthe voltage acrossresistors R3483 R3484 and rises. Whenthe voltage levelexceeds 0.6V,D6480 stans to conduct STANDBY-SUPPLY and PROTECTION becomes HIGH.Whenthe voltage across C2480is very high (e.9.whena lineproblem already present ís whenthe set is switched withthe mainsswitch), on D6zl81 D6,f82 and conduct EW-PROTECTIONactivated Íast. and is very protection The East/West becomes activein theÍollowing cases: 1. Badcontacts horizontal oÍ deÍlection circuit: . badcontacts horizontal of deflection coil r badcontacts linearity oÍ corrector L542i coil . bad contactsoÍ S-correction capacitoÍC2427 2. BadcontactsoÍflyback capacrtor C2425. 3. Shorted flyback diodeD6421or D6423. 4. Shorted S-correction capacttoí C2427. 5. Badsolder contacts the lineoutputstage. in WhenEW-protection beenactive, lineoutput has the transistor 7420mayalsobe defective. 6.4.5 Vertical-protection Thevertical outputstagecreates VERTICAL-PROTECïON pulses everyflyback pulse at whenit is functioning correctly. Thesepulses sensed are by the BIMOS lC71 19-4D pin37.Whenthepulse on trainis interrupted, BIMOS switch BIMOS the will to STANDBY mode. the BIMOS In STANDBY mode, BTMOS the switches oÍf the VDRIVE+ VDRIVEand whilethe RGBoutputs are 'l463maybe open. blanked. Circuit breaker Probably, the lineoutput stagewill notworkandthe powersupply will switch hick-up to mode(under voltageprotection). 6.4.6 Software protection protection managed the microprocessor. The software is by It continuously verifies presence the +5 and +8 the of supply voltages pin34 andthe activity the l2Cbus. on oÍ Whenthe pÍotection becomes active, soÍtware the will switch powersupplyon andoff continuously the the via STANDBY In this situation powersupply line. produces the a squeaking sound.
Set is switched standby standby to via line,settriesto restart. -+ Set is switched o No +SDbor +8ScatgC to standby standby via line,settriesto restart. 6.4.2 Power supply protections Thepowersupplywillgo to a verygoodaudible hick-up modein the following situations: r Overload protection r Underload o Overvoltage o Undervoltage ln hick-upmode Pin1 of 1C7520 startsup fromthe startcircuit Íor approximately seconds, 2 immediately thatthe after protection astivated. cycleis constantly is This repeated in hick-up mode.Whenthe set is in hick-up modea short squeak audibleevery seconds. is 2 6.4.3 Horizontahprotection Whenthe beamcurrent becomes highÍor a longperiod too thevoltage acrossC2450willdrop.D&50 willstaÍt conducting as soonas thevoltage and dropacrossR34S6 is 0V7,TS7450willconduct, making PROThigh. Viathe hold-circuitry the powersupply, setwillstayin of the, the protection mode(standby) canonlybe resetby and switching set off and on viathe mainsswitch. the Íault the lÍ is stillpresent, set willswitch standby the (protection to mode) again. 6.4.4 Ew-protectaon (not Íor 21" sets) The EasVWest protection switches powersupply the to standby the signallineSTANDBY-SUPPLY via PROTECTION. the hold-circuitry the powersuppty, Via of the setwill stay in the protection mode(standby) can and onlybe resetby switching setoÍf andon viathe mains the switch. the Íaultis stillpresent, setwillswitch lf the to (protection standby mode)again.
PCS 82 272GB
ServiceModes,DST,Errormessages,
l'C protection The l2C bus is controlledat each l2O-command. ThereÍoreevery l2Ccommand has a defined starístop condition.When the defined start/stopcondítionis repeatedlyincorrect,error 3 is placed in the enor buffer and the set switchesto software protection. l2C-protection generated in the Íollowingsituations: is . SDA shortedto earth . SCL shoÍted to earth . SDA and SCL shorted When SCL or SDA is shorted,the set tries to restart and the LED lights in a clearly recognisablepattern. . SDÁ/SCLshorted when the set is switchedON with the mains switch: LED is 8 secondsRED, 8 secondsGREEN,flashes RED,8 secondsGREEN,flashesRED, 8 seconds GREEN,flashes RED, etcetera. . SDIy'SCLshorted during operation LED is I secondsGREEN,flashesRED, g seconds GREEN,Ílashes RED, ercetera, +SDb and +8Sc protectionof the microprocessor +SDb and +8Sc are the main supply voltagesof the entire small signal procêssingoÍ the set. At pin 34 the microprocêssor senses whetherthe supply voltages +SSDbor +8SccomingfÍom the powersupplyare present.When one or both the supply voltages are míssing,the set switches to soítware protection.
6.5.2 Fault Íinding in the power supply In caseof a powersupplyproblem, powersupplycan the be simpliÍied a standalonepowersupplyat lowvoltages to (lowrisk)as Íollows: Controlpart oÍ the powersupply 1. Disconnect SSP(asa result linewillnot the the function moreandtherefore no longerbe a any will loadoÍ the powersupply) disconnect lineby or the jumper9400and R3400(if present) the removing on LSP. 2. Connect external powersupplybetween an DC supply - withcathode pin 1 1C7520 a diode- e.g.BYDSÉID (via to supplypin 1 1C7520) hotearth(e.9.earthoÍ the and bigsmoothing capacitor C2505). 3. Connect oscilloscope testpointP4 at pin g ICZSZO. a to 4. Turnup the exteÍnal supply DC voltage slowlyto 17V DC. Remark: ThelC stattsat a supplyvoltageof 14VDC, after that the supplyvoftagecan drop to approx.9V DC.At approximately DC, 18V protectionbecomes over voftage adive, resultingin a supplyvoftagedropbelow 7V DC beforea new staft-upis performedby turningup the supplyvoftage above 14V DC.
-
6.5
Faultfindingand repairtips
Note that Íor 21' sets, voltages and wave forms may differ.
(measured) 5. Thecorrect situation displayed . Other is in results indicate deÍectin the powersupplycontrol a part(1C7520 peripheral or components pins10or at 11 ) . Figure 6.2: SV/div; +
6.5.1 General
-
LEDandication start-up after procedure completed is
No LED Set is switchedOFF, supply problemor microprocessor problem. LED continuously Set is in standby,control part deÍective,standby mode defective. LED blinking Set in SDM, transmittingerror bufÍer.
SuS/div zlOKHz pulse
-
-
EnergytÍansÍer oÍ the powersupply (only iÍ control part is OK) 6. Applyaction1, 2 and4 as described earlier. 7. Connect lampof 230V/100W a across VOSoutput the capacitor C2569.
8. Connect a 1kQ resistorbetweenthe +SSTANDBY (connector7L10) and the STANDBY line (connector 8L10) to switch the power supply to normal operation. 9. Connectthe mains connectorto a VARIAC but leave it at 0. 10. Connect a voltmeter across C2569 and an oscilloscope between the drain of TS7541 (25 & 29) or TS7540 (21")and hot earth. 11. Slowlyincrease the mains inputvoltageby the VARIAC (in this way further damage to the power supply can be avoided).
Audible checks - Demagnetisation audible: mains voltage is present at LSP. - EHT audible:supply is operational(line output stage only works in case VOS (+140Vfor 25 & 29'; +95V lor 21") is present. - Hick-up sound power supply audible:power supply is shorted. Check the LOT (item 5430) and the line output transistorTS7420.
PCS 82 273 GB
---------------l
Protections, FaultÍinding Repair and tips
The wave forms Íor the Íollowing mains voltage aÍe given: Mains in voltage lOVAC: 20kHz and VOS 7V5 2OV AC: 40kHz and VOS 30V ztOkHz 4OV AC: and VOS 80V zlOkHz 65V AC: and VOS 1,10V
CorrecthóÍizontalcircuitry Notethatihè amplitude the signal oÍ strongly depends the on Írequency the generator. of 2. Figure 6.8: L3;test pointat collector output line (7420) transiBtor S0V/div; lossidiv
Line deflection open'. Current from e)dernalDC supply is appÍoximately100m4. Obseruatlon: Causes: small pulse followed by wide pulse and 100mA supply current horizontal deflection coil open linearity coil L5421 open S-conection C2427 open
> 65VAC: Stable situation, 40kHzand140V so problem, situation notstabilise In caseof a feedback the will or the voltage exceed140V(95Vwith 21') will
1. Figure 6.3: Mainsin 10V AC 10v/div; 1Ous/div
ffiffi l+-t-t-L.trl-t-1-l-lJ
fffiffiHtÏf\ffi
H*#fll-HrflH rfiiïftj-tH n--|-rï-rrn-t
2. Figure6.4: Mains in 20V AC 20vldiv; SuS/div + zlokHzpulse + VOS3OV 3. Figure6.5: Mains in 40V AC S0V/div; SuS/div ulokHzpulse + VOS8OV 4. Figure6.6: Mains in 65V AC S0V/div; SuS/div + 40kHz pulse + VOS 14OV
ffiffi Ht+++-llt+i-t_1
Íïï]ïflï-ïïÏ] F+#+fl-I-rt-fi frrï--rm-n
ffiffiF
ffiffiffi
l-t--]----l-ff-1
3. Figure 6.9: L3;test pointat collector output line (7420) transistor SoV/diq 1ops/div fromexternal supply Current DG approx 500m4!!
Obseruatlon: Cause: fast oscillations and 500mA suppty cunent horizontal deflection shorted (e.9. line deflection coil shofted)
ffiffi
ffi
n-n*-T-|-Ít
When the line deflection is not completelyshorted but only a number of windings are shorted,the wave Íorm does not show the oscillationand the curront of the e)Íernal DC supply is approximately200fnA.
6.5.3 Fault finding oÍ the horizontalcircuitry
When the horizontalcircuitry itselÍ is defective,h can be simplifiedto a stand alone'switched mode supply"at low voltages (low risk) as Íollows: 1. Disconnectthe set Írom mains. 2. Discoínect the SSP by removingall cables to the SSp. 3. Conneotan eldemal 50V DC (or 40V DC) supply with current measurementpossibilityacross C2400. 4. Replacethe HDRIVE by an eliternal LF generator[fTL level (between0 and 5V); duty cycle 50olo) with a t6 kHz pulse at the base oÍ TS7410 (near LOT at the side of the PCB). 5. Connect oscilloscope testpointL1 (collectoroÍ line a to
4. Figure 6.10: L3;test pointat collector outpui line (7420) transietor 1O0V/div; 1OpS/div Current ftome)dernal supplyis DC approximately 150mA Obseruatlon: flybacktimeis shofter,one exta pulsein between,150mA supplycunent Cause: flybackcapacitor C2425open 5. Figure 6.11: L3;test pointat clllectorlineoutput (7420) transiÉtor 1OOV/div;1OrrS/div Curretlt fromexternal supply 1A > DC per Obseruatlón: 2 pulses cycleextraand supptycurrent frommorethan1A Cause: short-circuit picturetube in (e.9.EHTto Aquadag)
outputtransisto 742Q\. r Possibilities: 1. Figure 6.7: L3;testpointat collector output line (7420) transistor S0V/div; lOps/div Currertt Íromexternal supply DC approx. 100m4
Obseruation: normal l6kHz pulses and 100mA suppty current
ServiceModes,DST,Errormessages,
6.5.4 Faultfinding "no picture,no protection"(problemin Thestartup phaseoÍ the setcan be identiÍied: 1. A bright white hórizontalline at the top; the rest oÍ the picture is darlt (sethangsin firstphaseoÍ startup procedure) picture the voltage Oscilloscope oÍ overthe gunslooks likefigure 6.12. (1C71 picturetubeand RGBamplifrers 19), TDA8366 are OK There should 4.5Vat pin16TDA8366. be
Normal start up procedure 1. FirstphaseoÍ start up; 4 white measuring lines (lines15, 16, | 7, 18) and the main picture is muted (wave forms are better visible ff the picture tube is cold); Figure 6.12: Red (pin 8 oÍ connector R43 on the CRT panel)and green gun (pin 6) 1O0V/div DC: 100us/div The total beam current is measured and fed back to pin 16 TDA83660C7119) The TDA8366 checks the voltage at pin 16 of the TDA8366 during these lines < 4.5V : set remains in this phase > 4.5V : set continueswith start up phase 2 2. Secónd phase of start up; each beam is separately measuredand the main picture is still muted. Line 15 is Red, line 16 is Greenand line 17 is Blue.BC_INFOis measured. - differencesbetween the lines (guns) are compensated - when the diffeÍencesare minimal the set continues with phase 3, otheruise it remains in phase 2
the video controller lC part TDA8366-4C)
When there is no pictureand no protection,it is most likely that there is a problem with the BC_INFO caused by the ïDA8366, the RGB ampliÍiersor the picturetube. For measuring, connect a video generator (e.9. PM5518) at the aeriAl input with a white pattern to the tuner. Trigger the oscilloscope field ftequent. A stable picture is obtained if triggeredwith VDRIVE+at pin 4 511.
Possibleproblem:iÍ thereis no 4.5Vpresent pin 16 oÍ at TD48366, thereis a defect(inoneor moreoÍ the In components) the BC_INFO Íeedback loop. 2. Smallhorizontalrcd, greenand blue lines at the top; the rest oÍ the pictuÍe is dark (sethangsin second phaseof startup procedure) TDA8366 OK is Possibleproblem:oneor moreof the gunsoÍ the picture tubeare bad Measure pin '16TDA8366 at whichfeedback line(s)(the R or G or B liÍle)is/aresmaller; corresponding the ampliÍier(s) gun(s)is/are or Íaulty. 3. No lines visible (pictuÍedark) pin possible Measure 16TDA8366; measuremênts: - 0V: (sandcastle the TDA8366 Check and supply voltage) - 5V: Check RGBamplifiers shortpin16TDA8366 ground, to nowtherewillbe measuring lines(at continuously phase1 and 2 is 5V, bypassed) - Pulses : thereis a measuring so the line, TDA8366 OK is Measure cathode the CRT on on paneliÍ the measuring linesare present: Yes + BC_INFO circuit is open
No or no HEATER voltage RGB ampliÍier problem
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3. AfterstaÍtup the picture present differences is and in points the R,the G andthe B gunare cut-off of compensated continuously. RepaiÍproceduÍe Typicalsituation:no pictureand no eÍÍoÍ codes - Switch seton. the - In a 4:3 set,press"pictuÍe size' to switch setto "16:9 the compressed" mode. - In a 16:9set,shift downthepicture thecursor with keys.
Protections, Faultfinding Repair tips and
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