| Make | Model | Problem | Solution | Date |
| | | |
| Found: 130
|
| Alba | CTV744 | Dead - HT present | L404 in line dr cct o/c | 14-09-04 |
| Alba | CTV744 | Dead - loptx shorted | also check R425 0R68 1w, R435 10k, R383 220R, IC301 TA7698AP, R419, R424 10k, D302/3/4 & D409 1N4148 | 14-09-04 |
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|
| Alba | CTV744 | Dead - Psu Ok , no line drive | L404 oc | 14-09-04 |
| Alba | CTV744 | Int sigs | R106 10k int o/c | 14-09-04 |
| B & O | 4402 | dead | HT only 17v; 5C10 47µ o/c | 14-09-04 |
| B & O | 4402 35XX | Dead | Check C10 & C12 ( 47u f ) | 14-09-04 |
| B & O | 4402 35XX | No sound or picture. | 5C10 ( 47u f ) o/c. | 14-09-04 |
| B & O | 4402 35XX | Width - line collapse. | Poor connections on scan coils leads. | 14-09-04 |
| B & O | 4402 35XX | Width - varieing intermittentley. | Poor connections on scan coils leads. | 14-09-04 |
| Bush | 2044 | Poor sound - erratic flashes on picture. | Tweak quadrature coil , flashes caused by tuner. | 14-09-04 |
| Bush | 28ZKF Orion 4400 | Dead with faulty on/off sw | Dry joints also LOPTr S2000AF s/c & LOPTx from SEME LOPTX1277 at ?18.95 Part S065621409 | 14-09-04 |
| Bush | 3463NTX 4400 | No sound/pic - no 5v | TP6 BD441 | 14-09-04 |
| Bush | 3472NTX 4400 | No pic - blank raster | TP6 BD441 in +5v supply | 14-09-04 |
| Bush | 3472NTX Pro 4400 | No pic or OSD - only blank raster | Check TP6 BD441 in 5v supply & DC4 1N4148 in BCL cct leaky between LOPTx & Scart. Check volts pin 22 TDA8843, (no higher than +3V) - > +3.6V then IC would disable RGB o/p to prevent crt burn. | 14-09-04 |
| Bush | WST Professional 4400 series | Service Mode access | hold menu button while turning CTV on until the red LED lights up. Release the menu button and press standby. | 14-09-04 |
| Bush | WST66 4400 | Dead - LEDs ok & EHT rustle | No 5v supply pin 39 & 44 of ICR1 & TP6 - BD441 faulty | 14-09-04 |
| Decca | D25N 440 | Service adjust proc | PSU Use pot PP1 to adj HT for 151V ± 0.5V for 16:9 tubes at TSP28 terms.
Activating service mode
1. Switch on the appliance whilst holding MENU on set until red LED lights.
2. Release MENU button & press standby on R/C. Defaults to prog l - (make sure test sig is on this chan)
Functsto be selected using P+ & P- keys on R/C.
Control & adjusts = Vol keys.note initial values before adj. In the event of replacing NVM memory or micro, it is nec to make all adjusts accessible in service mode, since replacement memory is supplied without any prior prog & new micro reqs initialization.
1. IF video setting (IFxx AFCxx) adjust reqs special equipment & needed only for ICC2 N1 version,
recognisable by presence of LC7 coil. If the coil is present, adj IF & AFC to values given on label left side of main PCB so that a suitable approx is achieved.
If the coil is not present, adjust as follows:
IF 50, AFC 3
2. Initialization (INIT CTV 831 x (VERSION)
The init proc, which also indicates software version for micro, is enabled with Vol+ key & must be carried out whenever NVM memory or micro replaced.
Initialization has effect of erasing all data from memory except bytes option.
3. Screen grid voltage (Vg2 Test)
Select funct, press Vol+ key. A luminous hor line appears in middle of screen. Adjt pot G2 so that line is just visible (in a dimly lit room). Press Vol- & wait for few secs until service mode is restored.
4. Control bytes (Cox)
These are control registers that must be set as follows:
Co4 00, Co3 27, Co2 96
5. Option bytes (Opx)
Correct values to set for each appliance are given on label on back cover alongside notations Op3,0p2 & Opl.
6. Audio/stereo A2 decoder (LA/SA)
The LA & SA functs allow adjustment of separation between right & left audio chans, & of file respective levels. A RF stereo generator is therefore reqd.
Dis modulation to LH chan & adj LA for 1.4Vp-p at pin 1 of SCART 1 connector.Adj SA for min residual signal at pin 3 of SCART 1. If a stereo generator is not
available/set LA to 01 and SA to OB to obtain a
fair approximation.
7. Setting the luminance/chrominance delay (Yx)
The delay must be adjusted to the following values:
Yp 18 (PAL) (UK VERSIONS)
Ys 30 (SECAM)
Yn 20 (NTSC)
Yo 22 (SCART)
The Yn function is only accessible if signal is NTSC coded (standard accepted only by SCART)
8. On screen display (OSD)
Load fixed value 3F. (AUDIO MENU APPEARS)
9. White control (WB/WG/WR)
Using black & white bar signal, adjust to obtain a correct grey scale.
10. Hor geometry (TC/CP/PW/EW/HSH)
2 groups of these functions, 1 for 4:3 format (suffix 4) & 1 for 16:9 format (suffix 16), both of which must be adjust because they are used in zoom functs (4:3
tubes included). The functs of single parameters -
TC Trapezium correction (4 adjusts appear in 4 X 3 & 16 X 9)
CP Corner parabola correction
PW Parabola correction
EW Horizontal amplitude
HSH Horizontal shift
For 4:3 format tubes, enter EW16 = 3F to ensure proper zooming.
11. Vertical geometry (SC/VSH/VA/VS)
Vertical geometry adj starting with VS (vertical slope), which is set so that central horiz line of test signal is exactly at boundary between the visible image & black part below & must not be changed again. Functions of single parameters -
SC Vertical S-coirection (linearity)
VSH Vertical shift
VA Vertical amplitude
VS Vertical slope
12. AGC tuner setting (AG)
With a signal of ImV applied to ae i/p on UHF chan, adjust to 4Vdc at pin 1 of tuner.
13. De-activating service mode
Once all nec adjusts have been made, press TV or MENU OFF on R/C to memorise and return to normal operating mode | 14-09-04 |
| Decca | D28N440 | Int start up | Dry joints TP6 BD441 & ICP3 TDA8133 on heatsink near chopper | 14-09-04 |
| Finlux | FN2144 | 1 NO SOUND OR PICTURE 2 NO SOUND ICP2 O/C 3 EXCESS | 1 R44 O/C + D20 S/C 2 SOUND OP IC S/C TDA4935 3 D28 S/C | 14-09-04 |
| Finlux | FN2144 | Excess width | D28 BY299 s/c | 14-09-04 |
| Finlux | FN2144 | No sound | ICP2 o/c, TDA4935 audio o/p chip u/s | 14-09-04 |
| Finlux | FN2144 | No sound/pic | R44 fusible o/c, D20 BY299 s/c | 14-09-04 |
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| Goldstar | CIS4441 | Bright white raster - sound ok | Replaced R424/425 Ibeam res under loptx - - A1 setting VERY critical | 14-09-04 |
| Goldstar | CIS4441 | Brightness excessive with pic appearing only briefly at sw on | Check/replace resistors 680k on crt base | 14-09-04 |
| Grundig | CUC4400 | Chan changes & vol varies int | IR detector TFMS3300 | 14-09-04 |
| Grundig | CUC4400 | ERATIC LINE SYNC | C2257 100nF 63v | 14-09-04 |
| Grundig | CUC4400 | Flickering/lines with pic breakup | C2257 100n 63v in line osc | 14-09-04 |
| Grundig | CUC4400 | Int refuses to go to st/by | Check mains sw wiper contacts | 14-09-04 |
| Grundig | CUC4400 | No sound or Picture, EHT normal, screen is black. | Change T2213 and T2221 on IF board. No leaks or any other defects were detected. | 14-09-04 |
| Grundig | CUC4400 | No sound or Picture, EHT normal, screen is black. | Change T2213 and T2221 on IF board. No leaks or any other defects were detected. | 14-09-04 |