Kortek corporation
73
of
99
PDP R&D Center
10.4 Sustain Open
(Some horizontal lines don’t exist on Video)
[ Y-FPC ]
Sustain Open
Y-FPC
① Y-Buffer
② Y-Buffer
Check (80piin)output of CON
(CN5401,5402,5403,5501,
5502, 5503)
Check Scan Driver IC(100pin)-
output
Upper(IC5401,5402,5403,5404)
Lower(IC5501,5502,5503,5504)
OK
NG
NG
OK
NG
Check FPC(80pin)CONN
(coldsoldering,insert
missing,lead bent)
Check connector
(Check opening by
coldsoldering,insert
missing,contact,a
foreign substance)
Repair/Replace the CONN
Check Scan Driver IC/100pin
(coldsoldering,insert
missing,lead bent)
③ Y-Buffer
④ Y-Buffer
[Y-버퍼/Y-MAIN]
Check contact &
coldsoldering of
CN5406,5506,
CN5501,5503
Check open/short of
PCB pattern between pattern
of CONN(80pin) and
IC output pattern
CN5406,5506(13pin).
Check STV7617 input-logic-
signal
NG
Replace the board
NG
Check FPC(80pin)-output
NG
Repair/Replace the CONN
NG
Repair/Replace the IC
Y-MAIN
Y-MAIN
Y-MAIN
OK
OK
OK
OK
Check
coldsoldering,
pin-shorting
→Replace the
IC
NG
NG
NG
Check output(2,4,6,8,10,12)pins
of the IC5005/HC7404
Check
output(3,5,7,9,12,14,16,18)pins
of the IC5006,5007/LV244A
Check input
(2,4,5,8,9,12)pins of the
CN5002/CON_30pin
NG
To check IC failure, raise IC output lead from
PCB pad and check the output lead waveform.
In case of IC failure, Replace the IC
Check coldsoldering,
pin-shorting
→Replace the IC
☞ In checking input or output pins,
Check “No solder/Cold solder/Lead bent” on Connector Leads