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Monitor COMPAQ 455. Szukam schematu. Trzy spalone rezystory.

tolko 23 Lut 2005 10:54 1146 2
  • #1 23 Lut 2005 10:54
    Poziom 16  

    Poszukuje schematu monitora .3 rezystory zwęglone, nie mażna odczytać wartości R 120, R205,R195.

  • #2 23 Mar 2005 00:15
    Spec od monitorów

    jest to schemat jak NOKIA 447E

    schemat był swego czasu na
    NOKIA 447E za Free

    Nokia 447E090 Narrow vertical bar; rutured R195 & R205. What values are these resistors? What other damage should be suspected, if any? R195 & R205 = 215 ohm, 0.5 Watt. In general (some part variations), on the several 447E chassis variants, when these two resistors burn, also check PFET's like T13 & T27, HOT T32, inductor M3 for shorts between its windings, resistors R120 = 100 ohm & R224 = 0.47 ohm, diode D28, & capacitor C121. Also check the various small SMD transistors, like T60 or T65, often marked '3F' = BC857B; these often go leaky or bad, but never it seems to be the same one twice. In the US, Trillium Industries (919-829-9747) carries Nokia coils; you'd need the coil's "FM" number, since "M3" is just a location. The Nokia chassis with thru-hole rivets should have any bad solder on these rivets resoldered on BOTH sides of the board; the bad solder is a common problem with these models Check transistor T24, a BF422C TO-92, right next to the TDA2040 amp.

    Nokia 447X with hv but no horizontal sweep. Yoke is OK. Aside from bad yoke connections, and bad solder on the small board inside the cover on the back of the yoke, other common problems are FET# T27, resistors R195, R205, R224, and shorts in centering transformer M3. To replace M3, you need to read off its part#, which begins with FM2525 or FM2565, etc. There are several M3's, and your Nokia model number is incomplete (is it 447X058? 447X158? 447X258? etc), so I can't tell what you have, but be sure you order the correct M3 type from Nokia, or (in the US) from Trillium, 919-829-9747. If the board uses those small thru-hole rivets for its 'vias', these rivets may be breaking loose from the repetitive heating/cooling cycles of running, and may all need resoldering, on both sides of the board, or these problems can recur. I replaced M-3 (orderd from Trillium) T-27 ( P-channel Mosfet) and R224? a 47 ohm? resistor. This restored the raster but when I connected the BNC cables, screen would go blank. As it turns out the V and H BNC cables needed to be swapped, even though connected normally on a Qvision 150 the Qvision would work fine. Also the T-27 I replaced. NTE2372 was supposedly not compatable. I recommend ordering it from Trillium
    Nokia 447X I need a replacement part number for M3 a driver transformer in the deflection. Number on the transformer is FM2525 5373. The part number on the small transformer IS the part number. I had the same thing on a FUJITSU-ICL monitor (even SALORA). Try all these brands (monitor may be called 447*).
    Not work a regulation of bright to VR501. Check of VR501, VR101, R507, Q501, D501, D502, C501, C503, R501.
    Not work a regulation of contrast. Check of Q187, R198, VR191, Q186, C189, D190.
    Not work a regulation of contrast. Check of Q203, C108, D501, Q501, D502, D503, C501, IC101. No high voltage, no raster. Check of Q408, C434, C413, D408, IC402, Q415, Q404, C418, C422, C423, D406, D407, Q403. Vertical line. Check of C420, C421. The size of picture is not adjust. Check of Q414, VR404, C409, C410, C421, Q405-Q407. Horizontal line. Check of R304, IC301. The pictures in up and bottom is bad. Check of C402-C406.
    Not work a regulation of contrast. The IC101 is bad

    R204=0,47 om
    M3 FM2525 (entering coil)
    R205=R195=215 om


    wynika ,że raczej nieopłacalne

  • #3 17 Maj 2005 13:02
    Poziom 16  

    Dzięki -rzeczywiście to się nie bardzo opłaca. Lepiej kupić nowy.

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