Список разделов >> Архив по мониторам: «Существуют ли 17" модели с раздельной разверткой, где...»
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027
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Што есть делитель с диодом?
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Вт Июн 10, 2003 2:22 pm
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rezident
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Делитель из двух резисторов. Со средней точки сигнал снимается через диод. Удобно использовать как ограничитель +В когда с ООС непонятки творятся. Включаю в параллель штатной ООС, потому и диодик стоит.
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Вт Июн 10, 2003 2:25 pm
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027
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Понятно.
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Вт Июн 10, 2003 2:35 pm
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Shurin
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А что если, вокруг красного провода намотать небольшую катушечку, да и снимать с нее сигнальчик?
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Вт Июн 10, 2003 3:48 pm
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igor.gm
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Ne v Temu Sergew M: Etot monitor imeet standartnyj defekt : FBT + M62501+ Transistor HV-Konvertera.
Y265382 / 6174Z-1024B / 6174T-13003C
Anatek:
QUESTION NO. P62502-10: LG795SC monitor FCC ID: BEJCB790 has shorted Q514, 515, 516, 531 & D528. Flyback checks out at 34.6KV, not sure about IC501 but has 1K. Resistor at J80 link and link where R555 (1K?) should be according to my schematics. Is this assembly incorrect or is there a mod it just means that the spark gap has no resistance from the flyback point? This is the basic version or early version to the LG made Apple Studio Display M6496 17 inch.
That HV level is excessive; it should be about 26KV in this LG model. A bad flyback (6174Z-1024B or Y265382) can cause excess HV in this LG; the HV adjust is at VR501.
QUESTION NO. P50902-4: Apple Studio Display 17 [M6496]. A standard fault in this monitor seems to be that something arches (assumingly within the flyback) that can go on for a while until it blows up other parts and the monitor stops working. I`ve got a bundle of these monitors that have stopped working. What other parts (apart from the flyback) should be replaced? When repaired by Apple their list of replaced parts show a diode, a rectifier diode RL2, an 18 Volts zener diode of type MTZJ18, a 2K resistor, the Q503--2SJ306 MOSFET and the flyback (6174T-13003C or 6174Z-1024B or Y2653820). The 2K resistor is easy to find as there`s only one on the print (R555), the flyback and the MOSFET are also obvious but where are the other parts (what are their part numbers)?
Besides the flyback, check FET`s Q503 = 2SJ306 and Q507 = 2SK2847. D502 is an 18V zener such as you have described, used for gate protection on Q503, but also check D505, the diode off the gate of Q507. The D503, off the drain of Q503, is either RL2 or RL2A (Sanken ultrafast types); double check your exact type, as RL2A is rated at 600V, 1.1 Amps, but RL2 is only rated for 350V. Also check IC501, Q203, Q204, R547 (47 ohm), and the small diode connecting to R555, which is D532 (similar in specs to 1N4448).
FBT: http://www.donberg.ie/descript/h/hr46162.htm
Tak vygljadit Monitor: http://www.neiparts.com/cmparts/brand/apple/imac.php
BOBAN: http://conf.web.vist-v.ru/cgi2/conf.cgi?conf=monitor&pg=1&action=view&bid=961354460
Found this with a Google search, and there are a couple of tips re this monitor at the Anatek site...
QUESTION NO. P62502-10: LG795SC monitor FCC BEJCB790 has shorted Q514, 515, 516, 531 & D528. Flyback checks out at 34.6KV, not sure about IC501 but has 1K. Resistor at J80 link and link where R555 (1K?) should be according to my schematics. Is this assembly incorrect or is there a mod it just means that the spark gap has no resistance from the flyback point? This is the basic version or early version to the LG made Apple Studio Display M6496 17 inch.
That HV level is excessive; it should be about 26KV in this LG model. A bad flyback (6174Z-1024B or Y265382) can cause excess HV in this LG; the HV adjust is at VR501.
Sorry no FCC ID or chassis numbers
The FBT is T703,
EHT Fet = Q507 2SK2847 connected to pin 2 of FBT along with C525,
IC701 = NEC uPC1884CT
IC801 = Motorola LSC508410B (LGM812-180/BYK)
IC802 = 24C08
PSU FET = Q902 2SK2847
IC901 = UC3842B
IC902 = STR-83145
IC303 = VPS13G
This is not the same as SW795SC
T901 voltages are as follows:
PIN 11 GND
PIN 12 80V
PIN 14 180V B+ LINE FOR HOT
PIN 15 -12V
PIN 16 GND
pin 17 25V
pin 18 15V
IC911 12V REGULATOR
IC912 5V REGULATOR
IF ALL VOLTAGES ARE AS ABOVE DISREGARD THE TEXT BELOW.
IF THE 180 VOLT LINE IS MUCH LOWER THAN THIS...TRY DISCONNECTING D925 OR D926 TO SEE IF YOU GET ANY OF THE OTHER VOLTAGES
> This unit has HOT {Q707} with a B+ of 50 volts. Its horizontal output pusle isn`t distorted or that low in level.
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But the Screen-G2 is zero, which come directly from the flyback. Which makes believe it is the flyback? Anything else I should check? IS 50 volts for b+ correct ?
>
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Вт Июн 10, 2003 6:28 pm
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027
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"А что если, вокруг красного провода" ..... получица трансформатор тока, а зачем нам информация о токе дозаряда емкости акводага?
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Ср Июн 11, 2003 8:37 am
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Shurin
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а зачем нам информация о токе дозаряда емкости акводага? - Ток и напруга как-то связаны , я-то всегда считал, что изменение анодного напряжения связано с увеличением токов лучей (черно-белое поле) и прицем тут емкость акводага?
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Ср Июн 11, 2003 10:16 am
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