[3k]

Сгорает IRF740 и диод D116 через 15 минут нормальной работы.Строчный транзистор целый.Температуру IRF740 к сожелению не мерил.Что еще обычно
выходит из строя при такой неисправности?

[Rush]

А дроссель там часом не поджаренный?? ( L 105 по моему)

[3k]

А дроссель там часом не поджаренный?? ( L 105 по моему)
На внешний вид вполне нормальный!

[Michael]

Esli chassis kak y DX17F, to....
> Chris wrote:
> : Here`s the mod:
>
> : Affected units - Mag models DX17F, CS17762LEG Gateway 2000 models
CS1776LE
> : (G), DX17F
>
> : Complaint - No picture, may be clicking
>
> : Solution - Test and replace as necessary the following:
> : R177 - 1 ohm, 2 watt
> : Q116 - IRF740
> : L105 - approximately 4 - 5 mH or replace if burned
> : C147 - 22 uF, 250 V
> : D116 - 30DF6 or equivalent
> : C123 - Replace with high temp 1 uF, 50 V
> : R501 - Replace with 1.8 K, 1/4 W
> : Q109 - Replace with 2SC4747
>
> : Preliminary - If the following components are installed then remove and
> : perform the following:
> : D121, D122, D123, C170, R193, Q117
> : Install a jumper from collector to emitter of Q117
> : Remove metalized plastic sheild over CRT attached to CRT PCB and
discard
>
> : Modification - Observe the position of VR901 (H-SIZE). It is located on
the
> : right edge of the main PCB in front of the power supply just underneath
the
> : CRT. The following components will be needed depending on its position:
> : 11 o`clock or less - Two .0022 uF, 1600 V
> : 11 - 1 o`clock - Two .0015 uF, 1600 V
> : 1 o`clock or more - Two .001 uF, 1600V
> : Turn VR901 fully clockwise and install capacitors in parallel with C134
and
> : C137. Apply a 1024 x 768 (H. rate - 56.476 KHz, V. rate - 70.1 Hz) white
> : screen and apply power to unit. Adjust HV to 25.5 KV (VERY CRITICAL).
Reset
> : to factory defaults and adjust VR901 to proper width. The controls
around
> : VR901 adjust the geometry and may need adjustment. You can use any
pattern
> : you desire but it must be in this mode. Adjust white balance but be
carefull
> : not to overdrive the CRT. R501 sets the ABL and replacing it affects
white
> : balance and increases intensity (needed because of reduced HV).
>
> : NOTE - This mod reduces considerably the temperature of the horizontal
> : output and extends the life of the unit. I have used this mod for a
couple
> : of years with more than 500 units and without one recall. It also seems
to
> : improve the quality of the picture in most cases. --- Chris Mann, CET