| Make | Model | Problem | Solution | Date |
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| Found: 776
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| Matsui | 28BKG | Dead - mains sw duff - replacement details | SW757 @ 8.57 UKP from SEME | 14-09-04 |
| Matsui | 28DPL CUC2040 | St/by only - occaisionally comes on but with flashing/jumping | Dry joints C60009 in psu pri | 14-09-04 |
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| Matsui | 28DW01A | Field cramped & poor washed out pic when A1s advanced | IC403 TA8427K field IC & dry joints pin 4 LOPTx | 14-09-04 |
| Matsui | 28M1 | Int dead when chassis disturbed | St/by tfmr int | 14-09-04 |
| Matsui | 28M1 Mk III | Dead | Check start up resistors R621 & its partner 180k 1w | 14-09-04 |
| Matsui | 28M1 MkII Sanyo EB4-A28 | No start up | R620 o/c D614 s/c & changed R624 & Chopper tr
all I get is the standby light flashing with no attempt to start. Micro replaced & ok now | 14-09-04 |
| Matsui | 28M1Mk3 | Standby light flashing continuously.SMPS dead. | Q613, 2SC4429. Q612, 2SC3807 and R620 R621 2X 120K. | 14-09-04 |
| Matsui | 28N03 | Service mode entering | Adj HT for 151V ± 0.5V (16:9) TSP28 Switch on TV whilst holding down MENU on TV until red LED on. Press St/by on R/C - TV will default to prog 1 or AV. Select funct with P+ / P- on R/C & adj with Vol+/-. Note initial values before changing. 1. IF video setting (IFxx AFCxx) needs special equipt - only reqd for ICC2 N1version - has coil LC7 fitted - adjust IF & AFC to approx values on label left side of main PCB, adjust as follows: IF 50; AFC 3
2. Init (INIT CTV 831 x (VERSION) enabled withVol + key & must be carried out whenever NVM memory or micro is replaced - init erases all data from memory except bytes option.
3. Screen grid voltage (Vg2 Test) Press Vol+ key. A luminous hor line appears in middle of screen. Adjust G2 so the the line is just visible then press Vol- & wait for a few secs until service mode is restored.
4. Control bytes (Cox) set as follows:Co4 00; Co3 27; Co2 96
5. Option bytes (Opx) Correct values given on back label alongside Op3, Op2 & Op1.
6. Audio/stereo A2 decoder (LA/SA) allow adjust of R/L audio separation An RF stereo gen is reqd. Dis modulation to LH chan & adj LA for 1.4Vp-p pin 1 of SCART 1 . Adj SA for min residual signal at pin 3 SCART 1. If stereo gen unavailable, set LA to 01 & SA to 0B for a fair approx.
7. Setting lum/chrom delay(Yx)use following values: Vp 18 (PAL) (UK VERSIONS); Vs 30 (SECAM); Vn 20 (NTSC); Yo 22 (SCART) Yn function only accessible if 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)
Use B & W bar signal, adj for correct grey scale.
10. Hor geometry (TC/CP/PW/EW/HSH) 2 groups of functions,
4:3 format (suffix 4) & 16:9 format
(suffix 16), both must be adj as they are used in zoom funct
TC Trapezium correction
(The 4 adjusts appear in 4x3 & 16x9); CP Corner parabola corr; PW Parabola corr; EW Horizontal ampl; HSH Hor shift - 4:3 format enter EW16 = 3F to ensure proper zooming.
11. Vert geometry (SC/VSH/VA/VS) start with VS (vert slope)
central horiz line of test signal is exactly between visible image & black part below and must not be changed again. Functions of single parameters: SC Vert S-correction (linearity); VSH Vert shift; VA Vert amplitude; VS Vert slope
12. AGC tuner setting (AG) -signal of lmV to the ae I/P adj to 4Vdc pin 1 of tuner.
13. De-activating service mode - press TV or MENU OFF on R/C to save & return to normal. | 14-09-04 |
| Matsui | 28N05A | No sound | Reprog EEPROM | 14-09-04 |
| Matsui | 28WV2N | Dead - chopper tr T60006 blown | check either R60001 and R60007, 56Kohms and 270k ohms | 14-09-04 |
| Matsui | 28WV2N | Dead with HT fuse blown | power mosfet K2544 was S/C and R60001 270 k O/C | 14-09-04 |
| Matsui | 28WV2N CUC2059 | Dead | T60006 BUZ90 s/c, also replace R60001 62k 1w & R60007 270k 1w | 14-09-04 |
| Matsui | 28WV2P | Dead - repeated blowing of LOPTr | R60001 270k hi res | 14-09-04 |
| Matsui | 28WVDP CUC2059 | Dead - both mains fuses o/c | T60006 chopper Tr BUZ90A s/c - caused by R60001 270k o/c | 14-09-04 |
| Matsui | 32W2DP CUC2058 | low width, No E/W correction | Replace R55006 ( 4.7 ohm safety res, varies with CRT size )
resolder dry joints on T55002 | 14-09-04 |
| Matsui | 32WV2DP CUC2058 | St/by only | field ic TDA8350q and
both feed res R54012 1R & R60011 33R | 14-09-04 |
| Matsui | 6091 | Dead | s/c rect in lop stage | 14-09-04 |
| Matsui | 6091 | Dead - blows 2.5A fuse due to heavy load on LOP | D407 s/c - BY210 used in lieu - field o/p stage rect | 14-09-04 |
| Matsui | 6091 | Dead - blows 2A fuse | D406 FR155 on sec of loptx s/c - used RGP15M in lieu | 14-09-04 |
| Matsui | 6091 | Field hold int | R412 220k pot had increased in resistance | 14-09-04 |
| Matsui | 6091 | no col | C331 22n o/c also replaced C332 22n | 14-09-04 |
| Matsui | 6092 | Dead - s/c in LOP stage | C312 0µ056 200v - part of volts doubler | 14-09-04 |
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| Matsui | 6092 | No pic/sound ok - field coll when A1s advanced | ZD204 9v1 zener s/c, R257 5R6 o/c | 14-09-04 |
| Matsui | 6092 | Sound weak & dist | Q706 2SD400 on psu - BC639 used in lieu | 14-09-04 |
| Matsui | MB10 | Dead on mains - ok on 12v | 4700pf 2kv cap on print side of board not shown in cct diag was s/c | 14-09-04 |
| Matsui | MB10 | No psu start up | Q805 2SC2120Y leaky - BC639 used in lieu | 14-09-04 |
| Matsui | TVR | | 1000uF cap 2412 | 14-09-04 |
| Matsui | TVR141 | Comes on for 2-3 secs then reverts to st/by | Mode sw | 14-09-04 |
| Matsui | TVR141 | Dead - no LEDs - PSU working | C523 16V 100uF (next to the heatsink IC502, it is the tallest heatsink on the PCB). | 14-09-04 |
| Matsui | TVR151 | Missing blue, patchy picture, Horizontal blue lines down LHS | C630 on VCR PCB broken away from pad (C629 & C628) correspond to green and red | 14-09-04 |