| Make | Model | Problem | Solution | Date |
| | | |
| Found: 1049
|
| 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 |
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| 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 |
| Panasonic | Alpha 1 | Pic brightens & drops with dist field scan when heated | Scan coils faulty - reqs replacement of crt as they are bonded | 14-09-04 |
| Panasonic | Alpha 1 | Pic goes in from RH side with black line across centre | Dry joints field o/p chip | 14-09-04 |
| Panasonic | Alpha 1 | Plain blank raster & no sound , no OSD sync - Ok via rear sockets. | Replace IC101 ( TDA4505M ) in side can middle of chassis. | 14-09-04 |
| Panasonic | Alpha 1 | Q551 KEEPS BLOWING | CHECK DRY-JOINTS ON LINE OUTPUT TRANSFORMER | 14-09-04 |
| Panasonic | Alpha 1 | Raster - blanking out. | IC801. | 14-09-04 |
| Panasonic | Alpha 1 | Reduced top frame after a few minutes. | Scan Coils! | 14-09-04 |
| Panasonic | Alpha 1 | Remote commands int ignored | Dry joint X3505 Xtal on Txt pcb | 14-09-04 |
| Panasonic | Alpha 1 | Replacement of TDA4505M-N3 | You can use cheaper TDA4505E if R113 changed from 22k to 270k, R112 from 1M2 to 470k & re-align afc coil | 14-09-04 |
| Panasonic | Alpha 1 | Replacing TDA4505M-N3 with TDA4505E | Change R113 from 22k to 470k; R112 from 1M5 to 470k; align AFC for optimum pic | 14-09-04 |
| Panasonic | Alpha 1 | Screams | Ht=20v lop tr 2SD1439 leaky CP567 1A cct prot o/c | 14-09-04 |
| Panasonic | Alpha 1 | Squealing. | Line drive transformer. | 14-09-04 |
| Panasonic | Alpha 1 | TDA4505M-N3 replacement by TDA4505E | Change R113 from 22k to 470k; R112 1M5 to 470k & re-align AFC as nec | 14-09-04 |
| Panasonic | Alpha 1 | Tripping | D854 SR2KN avalanche diode s/c due to C808 10µ 50v low cap (could also be STR54041M chopper chip) it is advisable to change both | 14-09-04 |
| Panasonic | Alpha 1 | Tripping with field collapse | R7000 180k & R7005 150k start up res on side panel | 14-09-04 |
| Panasonic | Alpha 1 | Tuning - drift. | IC801. | 14-09-04 |
| Panasonic | Alpha 1 | Whistling D854 s/c (RM2) | C808 10mfd 63V in psu o/c Replace RM2 | 14-09-04 |
| Panasonic | Alpha 1 TX2482 | Line foldover then dead with LOPTr 2SD1441 s/c | Check for dry joints line dr trfmr & LOPTx | 14-09-04 |