Checking For Component Damage; Y Ipm(Ic 12) Or Z Ipm(Ic 4) Damage; Fet Ass'y(Y B/D: Hs1) Damage - Beko P7 Service Manual

3. Checking for component damage

3-1. Y IPM(IC 12) or Z IPM(IC 4) damage

(1) When the internal Sustain_FET of Y IPM(IC 12) or Z
IPM(IC 4) is damaged, screen doesn't be shown or electric
discharge is generated.
Test Point: GND~B103(Y B/D), GND~B37(Z B/D)
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Wave format: B103(Y B/D) or B37(Z B/D) has no wave
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output
(2) When the internal ER_FET of Y IPM(IC 12) or Z IPM(IC 4)
is damaged, Y IPM or Z IPM emission is increased.
Test Point: GND~B103(Y B/D), GND~B37(Z B/D)
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Wave format: As shown (Fig. 1)
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(Fig. 1) When the ER_FET is damaged
<IPM Normal Output Wave >
Measurance position: Sustain section enlarge the after
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measuring B103 wave of Y B/D and B37 wave of Z B/D.
(Full White Pattern)

3-2. FET Ass'y(Y B/D: HS1) damage

(1) When Set_Up FET is damaged, screen doesn't be shown
Test Point: Enlarge the after measuring GND~B103(Y
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B/D)
Wave format: As shown (Fig. 2)
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(Fig. 2) When the Set_Up FET is damaged
(2) When Set_Down FET is damaged, electric discharge of
entire screen is generated.
Test Point: Enlarge the after measuring GND~B103(Y
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B/D)
Wave format: As shown (Fig. 3)
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(Fig. 3) When the Set_Down FET is damaged
<FET Ass'y Normal Output Wave >
Measurance position: Reset section enlargement wave of
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TP B103(Y B/D) (Full White Pattern)
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