Beko L6B PDP TV, Service Manual

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English
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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.
O
Test Point: GND~B103(Y B/D), GND~B37(Z B/D)
O
Wave format: B103(Y B/D) or B37(Z B/D) has no wave
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.
O
Test Point: GND~B103(Y B/D), GND~B37(Z B/D)
O
Wave format: As shown (Fig. 1)
O
Measurance position: Sustain section enlarge the after
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
O
Test Point: Enlarge the after measuring GND~B103(Y
B/D)
O
Wave format: As shown (Fig. 2)
(2) When Set_Down FET is damaged, electric discharge of
entire screen is generated.
O
Test Point: Enlarge the after measuring GND~B103(Y
B/D)
O
Wave format: As shown (Fig. 3)
O
Measurance position: Reset section enlargement wave of
TP B103(Y B/D) (Full White Pattern)
(Fig. 1) When the ER_FET is damaged
<IPM Normal Output Wave >
(Fig. 2) When the Set_Up FET is damaged
(Fig. 3) When the Set_Down FET is damaged
<FET Ass’y Normal Output Wave >