LG PFM-42V1E, Service Manual

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2. Hitch Diagnosis Following
Display Condition
2-1. 4/7 or 3/7 of the screen doesn t be
shown
(1) Confirm the power connector of X B/D is well plugged in
which is correspond to not showing screen.
(2) Confirm the connector that is connected between CTRL
B/D and X B/D correspond to not showing part.
(3) Replace relevant X B/D.
[ Relationship between screen and X B/D
Screen X B/D
Left of the Screen 4/7 <--> Right X B/D
Right of the Screen 3/7 <--> Left X B/D
[ Screen Display Form
2-2. The screen doesn t be shown as Data
COF
(Include not be shown part of Data COF quantity or a part)
(1) The problem between Data COF and X B/D is more
possible that the screen is not be shown as data COF.
(2) Confirm the connector of Data COF is well connected to X
B/D. Correspond to the part that screen is not showing
(3) Confirm whether the Data COF is failed and replace X B/D
[ Example of the screen display form
(Anything of the 7 Data COF can be shown beside below
pictures)
: All
: Partial
: not at all
ANODE Pattern (GND)
CATHOD Pattern and examine the Diode
to the pure or reverse direction.
1
GND 1
Measure the third resistance value
Resistance
2
2
[ How to examine Data COF IC
Left of the Screen(4/7) Right of the Screen(3/7)
Display
Not display