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When in service mode:

Use Program up/down to go to the next line
Use Cursor up/down to get to the next page
Use Cursor Left/Right to change an item (+10/-10)
Use Volume Up/Down to change an item (+1/-1)
Use INPUT to select a different input
Use RETURN to return to a present page
Use Enter for executing a function

Here is a printout of the 16 pages of service mode from a KRL-32V.
Note that some settings are TV specific.
Also note that I have no idea what most settings do...., or what the effect will be (you might render your TV inoperable!).
A service manual can be found at www.scribd.com

1/16
MAIN Version	1.07 (E P 2008/07/25 1)
BOOT Version
Monitor Version	1.02
FRC Version	40303212
CPLD Version	b1
EQ DATA CHECKSUM	ROM			Audio data checksum
LAMP ERROR	0			Number of termination due to lamp error
MONITOR ERR CAUSE	00 00 00 00			See table below for error explanations
NORMAL STANDBY CAUSE	0
ERROR STANDBY CAUSE	1) 0	2) 0	3) 0	Error standby cause
	0H 0M	0H 0M	0H 0M	Total operating time before error
ERROR STANDBY CAUSE	4) 0	5) 0
	0H 0M	0H 0M

2/16
INDUSTRY INIT	Enter			Initialization to factory settings
INDUSTRY INIT(-Hotel)	OFF
HOTELMODE	OFF
Center Acutime	3899H 15M			Accumulated main operation time
RESET	OFF
BacklightAcutime	4067H 49M			Accumulated monitor operation time
RESET	OFF
LAMP ERROR RESET	OFF
ADJ PARAM SET	Enter
VIC XPOS	0			X-coordinate setting for VIC READ
VIC YPOS	0			Y-coordinate setting for VIC READ
VIC SIGNAL TYPE	MAIN			Signal type setting for VIC READ
VIC READ	OFF			Picture level acquisition function Level appears in the upper right

3/16
RF AGC ADJ	Enter
TUNER ADJ	Enter
PAL+TUNER ADJ	Enter
RF AGC ADJ(CA-8CH)	Enter
TUNER ADJ(CA-8CH)	Enter
PAL+TUNER ADJ(CA-8CH)	Enter
RF AGC	15
TUNER DAC	155
RF AGC READ	OFF			Level appears in the upper right

4/16
PAL ADJ	Enter
SECAM ADJ	Enter
N358 ADJ	Enter
PAL CONTRAST	123
SECAM CONTRAST	128
N358 CONTRAST	120

5/16
HDMI CEC TEST	Enter			CEC == Consumer Electronics Control CEC is a one-wire bidirectional serial bus for remote control functions
INSPECT USB TERM	Enter
MONIDATA READ[TEMP/OPC]	OFF			Levels appears in the upper right
CAUSE RESET	Enter

6/16
COMP15K ALL ADJ	Enter
COMP15K MAIN Y GAIN	203
COMP15K MAIN CB GAIN	215
COMP15K MAIN CR GAIN	211
COMP15K Y OFFSET	66
COMP15K CB OFFSET	516
COMP15K CR OFFSET	514

7/16
HDTV ADJ	Enter
HDTV Y GAIN	203
HDTV CB GAIN	212
HDTV CR GAIN	208
HDTV Y OFFSET	65
HDTV CB OFFSET	513
HDTV CR OFFSET	514

8/16
ANALOG PC ADJ	Enter
R OFFSET	65
G OFFSET	65
B OFFSET	64
R GAIN	199
G GAIN	193
B GAIN	203

9/16
SCART RGB ADJ	Enter
SCART R OFFSET	64
SCART G OFFSET	65
SCART B OFFSET	64
SCART R GAIN	209
SCART G GAIN	204
SCART B GAIN	212

10/16
VCOM ADJ	77			VCOM == Video signal common voltage The Vcom voltage needs to be placed exactly at the midpoint of the video signal to avoid flicker. Due to the variations in construction of each panel, the optimal Vcom voltage can differ from panel to panel or across a single panel.
LCD LUMA ADJ	Enter
LCD LUMA UP	0
LCD LUMA DOWN	0

11/16
DDRA TEST1	Enter
DDRA TEST2	Enter
DDRB TEST1	Enter
DDRB TEST2	Enter
DDRB TEST3	Enter
FRC ON/OFF	Enter
FRA DDRA BIST	Enter
FRA DDRB BIST	Enter
POSTFILTER ON/OFF	OFF

12/16
R GAIN(LO)	0
G GAIN(LO)	0
B GAIN(LO)	0
R GAIN(HI)	0
G GAIN(HI)	0
B GAIN(HI)	0

13/16
LCD TEST PATTERN	OFF
LCD AGI TEST PATTERN	OFF
LCD EVA PATTERN	OFF
FRA TEST PATTERN	OFF

14/16
A	16			Unknown
B	104
C	50
D	-11
E	82
F	93
G	16
H	104
I	50
J	11
K	71
L	82

15/16
1	-40			Unknown
2	-40
3	0

16/16
EEP SAVE	OFF			Write setting values to EEPROM
EEP RECOVER	OFF			Read setting values from EEPROM
MONITOR ERROR CAUSE RESET	OFF
STANDBY CAUSE RESET	OFF
MODEL NAME	PL8
PANEL SIZE	32
PRODUCT EEP ADR	0x0
PRODUCT EEP DATA	0x0

Monitor error cause short-list
02-09	Initial communication error
0A-11	Communication error
16	Lamp error
17	AC_DET error
1A	Monitor temperature error
1D-24	Power supply error