CT29B2STX Repair Tips




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MakeModel Ch.SymptomProblem SolutionSolutionBy:
Mitsubishi CT29B2STX
Line output transistor s/c, repeated failureReplace the four caps in the power supply C905 470uF, 35V, C906 470uF, 50V, C909 2.2uF, 50V and C920 100uF, 25V also note transistor varies with different size c.r.t.
Mitsubishi CT29B2STX
Blank raster with sound / field collapseThe field output chip IC451 TDA8178S was faulty, as this original Mitubishi part was no longer available a kit had to be fitted no.H27PO14010 for this model, this uses a different chip - type STV9379
Mitsubishi CT29B2STX
Severe NS bowingCheck for leakage of the small electrolytic capacitors on the vertical correction pcb at the right of the main pcb, check C4014 in particular and if found to be faulty also check transistor Q4009 2SA950 which may also have been damaged
Mitsubishi CT29B2STX
Various faults, dead, int. dead, poor frame, poor E-WChange all electrolytic capacitors in the primary. Check all large electrolytics in the secondary Ie bigger that 470uF, check all capacitors around IC950 error amp.. Most capacitors you will find are leaking electrolyte. Might be a long job!!!
MitsubishiEuro 12 CT29B2STX
N-S faultyQ4009 -30v reg on separate board near LOPTx - use BC640 in lieu
MitsubishiEuro 12 CT29B2STX
Field collapseFOP chip - comes as a kit as orig chip NLA - also check C906 47µ 63v, C909 10µ 63v, C452 220µ 35v
MitsubishiCT29B2STX Euro 11
Int goes to st/byPrint damage in BCL cct near conn between SCART sub panel & main PCB - The damaged track connects D551 near LOPT and R206 near pin9 IC201 MC44000. You will need to take the PCB out as this place is hidden under the plastic chassis.
MitsubishiCT29B2STX
TrippingCheck C906 47µ 63v & C909 2µ2 63v
MitsubishiCT29B2STX
TrippingR916 22k
MitsubishiCT29B2STX
Red flaringD655 (1N4148) on the CRT base panel leaky.
MitsubishiCT29B2STX
No N-S correctionQ4009 2SA950Y on PCC board o/c.
MitsubishiCT29B2STX
NICAM has intermit crackledry joints in IF can
MitsubishiCT29B2STX
N/S dist & won't adjQ4009 2SA950 o/c
MitsubishiCT29B2STX
GOES TO SECAM WHEN PLAYING VCRNFF-SELECT PAL FOR ALL VCR PROGS
MitsubishiCT29B2STX
Flaring pic modRemove R606,607,608. - change R609 to 56ohms
MitsubishiCT29B2STX
E/W FAULTY ADJUSTMENTS ON PCC BOARD DON,T WORKREPLACE Q4009
MitsubishiCT29B2STX
Dead - Q901 s/c.Fit mod kit ( wVe 77901 ) R901 , D908 , Q901 , C908 to 2700pf , C966.
MITSUBISHICT29B2STX
CUTS OUT WHEN COLDREPLACE C906 47MFD50V