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Electronic appliance repair tips database - TV (LCD,TFT,Plasma,Digital), Monitor, VCR, DVD recorder and player, Digital camera, Audio equipment, Microwave ovens, Phone systems, Computer repair
Make
Model
Problem
Solution
Date
Found: 57
Panasonic
Alpha 1
blank raster - no if noise
TDA4505M-N3 jungle chip faulty
14-09-04
Panasonic
Alpha 1
Blank raster with no sound, st/by led perm on
IC1203 micro MAB8461PT134 faulty - no SDA data pin 2 & pull up only 1.3v - lifting pin restored 4.8v
14-09-04
Panasonic
Alpha 1
BLOWS LINE TRANSISTOR
LINE DRIVER TX DRY JOINTED
14-09-04
Panasonic
Alpha 1
Colour - flashing bright blue.
IC801.
14-09-04
Panasonic
Alpha 1
Dark defocussed bars moving down screen
CRT low emission - minimise by adj of A1s
14-09-04
Panasonic
Alpha 1
Dead
Q802 SBY SWITCH 2SD965R
14-09-04
Panasonic
Alpha 1
Dead
Q551 2SD14441 Line output transistor s/c R567 1 amp fuse link o/c D854 R2KL s/c, C808 10ufd in power supply sending ht up to 190 volts
14-09-04
Panasonic
Alpha 1
Dead
Q802 2SD965R st/by sw tr in psu s/c
14-09-04
Panasonic
Alpha 1
Dead - display only
Q801 &Q802 2SD956/R Tr's leaky
14-09-04
Panasonic
Alpha 1
Dead - fuse Ok.
IC801 STR54041M chopper control IC.
14-09-04
Panasonic
Alpha 1
Dead - no psu output
D851 HT rect s/c C2408M
14-09-04
Panasonic
Alpha 1
Dead or int start up - chan display only
HT to STR54041 - chip faulty
14-09-04
Panasonic
Alpha 1
Dead STR54041 blown
Q801 & Q802 (both 2SD965). C808 (10mFd 50V) also replaced
14-09-04
Panasonic
Alpha 1
Dead with psu squealing
Line dr tr s/c - driver tfmr faulty due to arcing between heatsink lugs & print by driver tfmr
14-09-04
Panasonic
Alpha 1
Dead.
2SD965R standby switching transistor Q802 s/c.
14-09-04
Panasonic
Alpha 1
Field - Txt lines at top of pic
C455 100µ 35v hi esr
14-09-04
Panasonic
Alpha 1
flashes 1 col brightly then off with squeal
o/c coil on crt base
14-09-04
Panasonic
Alpha 1
Grey Scale poor with weak Blue
D306 on B o/p from decoder - used 1N4148
14-09-04
Panasonic
Alpha 1
Height reduced to 1 inch
IC451 TDA3653A, C554 10µ 250v hi esr
14-09-04
Panasonic
Alpha 1
High HT (128 instead of 119v)
C808 10µ 50v hi esr
14-09-04
Panasonic
Alpha 1
Int flicks off tune with momentary bright blue raster
Chopper chip IC801
14-09-04
Panasonic
Alpha 1
Lack of col at top of pic whilst playing pre-recs
Change C604 from 0µ047 to 0µ33
14-09-04
Panasonic
Alpha 1
Lack of height - lin ok
Fit 3R3 resistor across R461 to increase height
14-09-04
Panasonic
Alpha 1
Lines with whistle
C808 10µ 63v
14-09-04
Panasonic
Alpha 1
LOPTr Q551 int blows
Check dry joints line dr trfmr & R567 1A fusible resistor
14-09-04
Panasonic
Alpha 1
No col
Replace sub carrier trimmer and adj; check PAL delay line by subst
14-09-04
Panasonic
Alpha 1
No pic/sound - chan ind lit, psu whining
C808 hi esr, R567 pt no TSF19102 (fuse) - used 1.4A Wickman
14-09-04
Panasonic
Alpha 1
No sound or picture - squealing.
Line drive transformer.
14-09-04
Panasonic
Alpha 1
No sound/pic off air or via scart
IC2601 M51320P AV sw chip - to check, remove chip & jumper I/P & O/P pins
14-09-04
Panasonic
Alpha 1
off - safety res R851 2R2 o/c when replaced loud buzz
when base of line driver tr lifted buzzing stops. No line drive replaced TDA4505M-N3 jungle chip (must be correct suffix)
14-09-04
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Last SM download : IBM GA21-9183-4 IBM 3741 ReferenceManual Nov77
script execution: 0.09 s