[TechAssist] Re: [Update] Mitsubishi CS-35401 Video comes and goes - Sound stays.

  • From: tjanphyl@xxxxxxxxxxxxxxx
  • To: techassist@xxxxxxxxxxxxx
  • Date: Sat, 30 Jul 2005 23:30:17 -0400

LeRoy,I don't know how much here is duplicated,but I sent all I find 
on this model regarding any video failures.Sorry I don't seem to have 
a scemo.
HTH.

Model Number: CS-35401 Symptom: NO PIP VIDEO Cause #1 
1. CHECK C7026, AND C7036 BOTH 4.7 UFD 35 V PART # 181P504090 ON THE 
PIP PCB. 2. SUSPECT SUB-VIDEO SWITCH IC2002 (LA7956) PART # 
272P394010. LOCATED ON PCB-VIDEO. USE FOLLOWING LOGIC CHART TO 
CONFIRM: LOGIC PIN INPUT PIN 2 3 * HIGH = 5V TUNER 4 H H EXT 1 6 L H 
EXT 2 8 H L S-VHS 9 L L 

Model Number: CS-35401 Symptom: NO VIDEO Cause #1 
1. NO MAIN VIDEO,THERE IS VIDEO IN PIP ON EXT1 AND EXT2:-CHECK FOR 
1VPP OF LUMINANCE ON PIN 1 OF IC7000, IF MISSING OR LOW CHECK THE 
VALUE OF C7001 (4.7UF 35V), LOCATED ON THE PIP-PCB.THIS CAP MAY LEAK 
ELECTROLYTE ONTO THE BOARD AND OPENED A FEED THROUGH IN THE PATH 
BETWEEN C7001 POSITIVE LEAD AND THE EMITTER OF Q7003 OR CAUSE 
INTERMITTENT COLOR. PT#181P504090. (CHECK ALL 'SMD' ELECTROLYTICS AND 
TRACES ON PIP) 2. NO MAIN OR PIP VIDEO, CHECK C7014, 47 UFD 16V ON THE 
PIP PCB. PART # 181P502060 3. CHECK FOR 7.2V DC ON THE BASE OF 
Q7003,IF LOW OR MISSING.CHECK THE VALUE OF R7002 (150 OHM 
1/10W).LOCATED ON THE PIP-PWB. PT#103P401050 
Search the Mitsubishi Technical Database

Model Number: CS-35401 Symptom: NO VIDEO OR OSD Cause #1 
1. CHECK BLANKING PULSE AT IC201 PIN 1. SHOULD BE 8-10VPP. IF LOW, 
SUSPECT OPEN R585 (1.2 OHM 1.2W). LOCATED ON MAIN PCB AT FBT PIN 5.

Model Number: CS-35401 Symptom: VIDEO GOING IN AND OUT Cause #1 
1. TUNER VIDEO AND SOUND CYCLES BACK AND FORTH FROM CORRECT VIDEO AND 
SOUND TO SNOW. CHECK C713 (4.7UF NP 50V) ON MATRIX-PWB. 

Model Number: CS-35401 Symptom: LP MODE INOP W/EXT INPUTS Cause #1 
1. WILL RESUME OPERATION AFTER POWER LOSS ONLY WITH TUNER INPUT. 
REPLACE IC701 WITH NEW VERSION. PT# 274P157060 UPD17008CW-526 

Model Number: CS-35401 Symptom: NO PIP VIDEO Cause #1 
1. CHECK C7026, AND C7036 BOTH 4.7 UFD 35 V PART # 181P504090 ON THE 
PIP PCB. 2. SUSPECT SUB-VIDEO SWITCH IC2002 (LA7956) PART # 
272P394010. LOCATED ON PCB-VIDEO. USE FOLLOWING LOGIC CHART TO 
CONFIRM: LOGIC PIN INPUT PIN 2 3 * HIGH = 5V TUNER 4 H H EXT 1 6 L H 
EXT 2 8 H L S-VHS 9 L L 

Model Number: CS-35301 Symptom: BLACK PIC. WTH. PIP Cause #1 
1. BLACK PICTURE WITH PIP ACTIVE:-CHECK FOR A LEAKY OR SHORTED Q710. 
LOCATED ON THE CATHODE OF D708 ON THE MAIN-PCB. PT#260P582010 

Model Number: CS-35301 Symptom: NO VIDEO NO OSD Cause #1 
1. CHECK BLANKING PULSE AT IC201 PIN 1. SHOULD BE 8-10VPP. IF LOW, 
SUSPECT OPEN R585 (1.2 OHM 1.2W). LOCATED ON MAIN PCB AT FBT PIN 5. 

Model Number: CS-35301 Symptom: DELAY WHEN SW TO EXT VID Cause #1 
1. HAPPENS WHEN SWITCHING FROM ANTENNA VIDEO INPUT TO EXT VIDEO INPUT. 
DELAY IS APPROX 8-10 SECONDS. REPLACE C713 ON MATRIX PCB (4.7UF, 50V 
NON-POLARIZED). 

Model Number: CS-35301 Symptom: NEGATIVE PIX Cause #1 
1. CHECK FOR LUMINANCE ON PIN 41 OF IC201 IF MISSING OR LOW REPLACE 
DL202 LOCATED ON THE MAIN-PCB. PT#337P113020 

Model Number: CS-35301 Symptom: VIDEO GOING IN AND OUT Cause #1 
1. TUNER VIDEO AND SOUND CYCLES BACK AND FORTH FROM CORRECT VIDEO AND 
SOUND TO SNOW. CHECK C713 (4.7UF NP 50V) ON MATRIX-PWB. 
Number: CS-35301 Symptom: BLANK SCREEN ON TUNER INP Cause #1 
1.NO VIDEO ONLY A BLANK SCREEN ON TUNER INPUT,ON EXTERNAL INPUT SCREEN 
GOES WHITE AND SHUTSDOWN.CHECK C511 (.15UF 50V) ON PIN 46 OF IC201.ON 
THE MAIN-PCB. 

Model Number: CS-35301 Symptom: NO VIDEO Cause #1 
1. NO MAIN VIDEO,THERE IS VIDEO IN PIP ON EXT1 AND EXT2:-CHECK FOR 
1VPP OF LUMINANCE ON PIN 1 OF IC7000, IF MISSING OR LOW CHECK THE 
VALUE OF C7001 (4.7UF 35V), LOCATED ON THE PIP-PCB.THIS CAP MAY LEAK 
ELECTROLYTE ONTO THE BOARD AND OPENED A FEED THROUGH IN THE PATH 
BETWEEN C7001 POSITIVE LEAD AND THE EMITTER OF Q7003 OR CAUSE 
INTERMITTENT COLOR. 2.NO MAIN OR PIP VIDEO, CHECK C7014, 47 UFD 16V ON 
THE PIP PCB. PART # 181P502060 3. CHECK FOR 7.2V DC ON THE BASE OF 
Q7003,IF LOW OR MISSING.CHECK THE VALUE OF R7002 (150 OHM 
1/10W).LOCATED ON THE PIP-PWB. PT#103P401050 

Model Number: CS-35301 Symptom: NO PIP VIDEO Cause #1 
1. CHECK C7026, AND C7036 BOTH 4.7 UFD 35 V PART # 181P504090 ON THE 
PIP PCB. 2. SUSPECT SUB-VIDEO SWITCH IC2002 (LA7956) PART # 
272P394010. LOCATED ON PCB-VIDEO. USE FOLLOWING LOGIC CHART TO 
CONFIRM: LOGIC PIN INPUT PIN 2 3 * HIGH = 5V TUNER 4 H H EXT 1 6 L H 
EXT 2 8 H L S-VHS 9 L L 

Model Number: CS-35301 Symptom: BLACK SCREEN AND NO OSD Cause #1 
1. BLACK SCREEN NO OSD AND THE AUDIO IS O.K.AT TURN ON MONITOR PIN 29 
OF IC701 FOR 0 VDC,IF THIS INCREASES.DISCONNECT PIN 29 AND MONITOR THE 
PIN FOR 0V,IF MORE THAN 0V,REPLACE IC701.LOCATED ON THE MAIN-PCB 2. 
CHECK BLANKING PULSE AT IC201 PIN 1. SHOULD BE 8-10VPP. IF LOW, 
SUSPECT OPEN R585 (1.2 OHM 1.2W). LOCATED ON MAIN PCB AT FBT PIN 5. 

Phil

Phil Bader, Pres.
Jan Phyl TV Inc
Winter Haven, Fl
(863) 299-8821
estab. 1976

----- Original Message -----
From: LeRoy Westlund <llw@xxxxxxxxxx>
Date: Saturday, July 30, 2005 11:00 am
Subject: [TechAssist] [Update]  Mitsubishi  CS-35401  Video comes and 
goes - Sound stays.

> The PIP looked bad, with leaking fish caps, so I done the bypass
> anyway,...but,...it didn't help with my problem.
> I need to troubleshoot the Video switching ckts., but I don't have a
> schematic of that area. Can anyone provide me with a pdf. file for 
> the Video
> switching ckts., or at least tell me which IC , and part number I 
> need to
> check ?
> 
> Thanks again,
> LLW
> 
> LeRoy Westlund
> Westlund TV & Electronics
> 97 North Main                             " I forgot,..to remember,..
> Centerfield, UT 84622-0087           to forget "
> Ph./Fax  435-528-3822
> mailto:LLW@xxxxxxxxxx
> 
> -----Original Message-----
> From: Carol Rundle <brundle@xxxxxxxxxxxxx>
> To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
> Date: Friday, July 29, 2005 3:05 AM
> Subject: [TechAssist] Re: Mitsubishi CS-35401 Video comes and goes 
> - Sound
> stays.
> 
> 
> >Leroy,
> > Sure sounds like PIP , c7001,4.7@35v. ,also open',corroded, 
> connection at
> + side of c7001,If not there,
> > Might try heating , cooling cap's on A/V jack panel, (hair drier).
> >
> >  Bill,
> >   Bill's TV
> >    Sonora,Calif.
> >LeRoy Westlund <llw@xxxxxxxxxx> wrote:
> >This set has a good ,stable picture when using Ant-A or B.
> >Everytime I select External-1, or External-2, it takes about 45 
> seconds to
> 2
> >minutes, before the picture shows up. It just has a black screen 
> with OSD
> >OK.
> >
> >Sometimes the video will go away while watching it for a while. 
> It is
> >completly unpredictable. Tapping on PIP module, or using freez-
> spray has no
> >effect.
> >It will go bad every time, when I switch inputs from Ant-A or B, 
> and back
> to
> >Externals 1 or 2.
> >
> >I think the PIP module is OK, cause the problem only shows up on 
> external>inputs.
> >Should I try a PIP bypass first, anyway ?
> >
> >Could it be that the Video switching IC is bad ? If so,...what is 
> the ckt.
> >designation, and part number ?
> >Is it located on the Video input jack board ?
> >
> >Do any of you have any tips for a problem of this nature ?
> >
> >Any help is appreciated,
> >LLW
> >
> >LeRoy Westlund
> >Westlund TV & Electronics
> >97 North Main " I forgot,..to remember,..
> >Centerfield, UT 84622-0087 to forget "
> >Ph./Fax 435-528-3822
> >mailto:LLW@xxxxxxxxxx
> >
> >
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> >Carol Rundle
> >brundle@xxxxxxxxxxxxx
> >
> >
> >
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